Jam Code 30-01 is a second transfer section misfeed on Konica Minolta bizhub color machines. Konica Minolta service documentation classifies all 30-xx codes under the heading Misfeed at Second Transfer / Transfer Section — a category covering every fault type occurring at the point where the toner image transfers from the intermediate transfer belt (ITB) to the paper. The -01 suffix carries its standard mechanical meaning: paper failed to arrive at the second transfer section entry sensor within the specified timing window after the registration clutch (CL4) was activated to drive the paper from the registration nip toward the second transfer zone.

The official Konica Minolta description states precisely:

After the registration clutch (CL4) was activated to drive paper from the registration nip, the second transfer section entry sensor (PS_T2 or equivalent) was not triggered within the specified timing window. Paper did not reach the second transfer section.

Translated into field language: a print job was initiated from any paper source. The paper successfully fed from its source tray, travelled through the vertical transport section, arrived at the registration area, and formed the correct registration loop — all confirmed by the registration sensor. The WTEN image write signal handshake completed successfully between the print controller and the engine board, the imaging section confirmed it was at ready state, and CL4 fired on schedule to drive the paper from the registration nip toward the second transfer section. Within the timing window that must then elapse between CL4 activation and paper detection at the second transfer section entry sensor, no paper was detected. The paper stalled somewhere in the short but mechanically precise path between the registration nip exit and the second transfer nip. The machine recorded 30-01.

30-01 is the jam code that fires deepest into the paper path of any code in the bizhub jam code family covered in this series. By the time 30-01 fires, every preceding step in the paper journey has been confirmed successful: source tray feed, vertical transport, registration loop forming, WTEN handshake, and CL4 activation. The fault zone is narrow and specific — the paper path between the exit of the registration roller nip and the entry point of the second transfer nip — but it involves components unique to the color imaging section that require diagnostic knowledge distinct from anything in the feed path or vertical transport section.

Critically: because WTEN was issued before 30-01 fires, the entire imaging section is confirmed at ready state. The polygon mirror motor was at rated speed. The laser diodes were at output power. The photoconductor drums were driving. The ITB was running. None of these components are suspects for 30-01. The fault is exclusively mechanical, in the paper transport path between the registration nip exit and the second transfer sensor. This eliminates the entire board-level, firmware, and imaging-section diagnostic approach from consideration — 30-01 is always a mechanical paper transport failure, and its repair is always found in the physical paper path.

Field	Details
Jam Code	30-01
KM Category Heading	Misfeed at Second Transfer / Transfer Section — the 30-xx category covers all fault types at the second transfer section where the ITB toner image transfers to the paper. The -01 suffix means the second transfer section entry sensor (PS_T2) was not triggered within the timing window after CL4 activated. This is a mechanical paper transport failure in the registration-exit-to-second-transfer path
What is confirmed functional when 30-01 fires	Source tray feed mechanism (paper left the tray), vertical transport section (paper reached registration area), registration loop forming (paper arrived at registration sensor on time), WTEN handshake (print controller and engine board communication was successful), CL4 activation (registration clutch fired on schedule), full imaging section ready state (polygon motor, laser units, drum drive, ITB drive all at specification — because WTEN was issued). None of these require investigation for 30-01
Critical distinction from -40 codes (11-40 / 12-40 / 13-40 / 14-40 / 10-40)	The -40 WTEN timeout codes fire when paper is at the registration sensor but WTEN is not issued — the imaging section was not at ready state. In those codes, paper has NOT reached the second transfer section. In 30-01, WTEN WAS issued (imaging section WAS ready), CL4 DID fire, and paper was driven from registration — but stalled before reaching the second transfer sensor. These are completely opposite fault conditions. Never apply -40 board-level diagnostics to 30-01
Critical distinction from 10-04	10-04 (bypass tray) fires when the registration sensor itself is not cleared after CL4 fires — paper stalled at the registration area exit. 30-01 fires when paper has cleared the registration sensor area but did not reach the second transfer sensor — paper stalled between the registration exit and the second transfer entry. 10-04 is a registration-area clearance fault; 30-01 is a registration-to-second-transfer arrival fault. The paper is found in different locations
Critical distinction from -02 loop forming codes	The -02 codes fire when paper arrives at the registration nip but arrives late. Paper is found crumpled at the registration nip. 30-01 fires AFTER the registration nip — paper formed the loop correctly and CL4 fired. Paper is found flat and stationary in the pre-transfer guide path or at the second transfer nip, not crumpled at the registration nip
Detection Logic — BASEB models (C250i / C300i / C360i / C3350i / C4050i):	After CL4 activation following confirmed registration loop forming, the second transfer section entry sensor (PS_T2 / model-specific designation — refer to BASEB I/O section of SM) was not triggered within the specified timing count. On BASEB i-series models, the second transfer sensor is positioned at or immediately before the secondary transfer roller nip, where the paper leading edge must arrive within the timing window. BASEB manages CL4 output and monitors PS_T2 directly
Detection Logic — MFPB / FRB models (C258 / C368 / C458 / C658 / 368e / 658e):	After CL4 activation via the FRB, the second transfer section entry sensor (PS_T2 / model-specific — refer to FRB or EXCB schematic in SM) was not triggered within the permitted timing window. On MFPB platform color models, the second transfer section entry sensor is typically on the FRB or EXCB input circuit — confirm the PS designation and connector location in the model-specific SM before performing any Service Mode sensor check
Detection Logic — PFTDB models (654e / 754e / 758 / 808 / 958 / C659 / C759):	After CL4 (or equivalent registration drive) activation, the second transfer section entry sensor was not triggered within the timing window. On PFTDB platform models, the registration-to-second-transfer path length varies — longer on high-volume models with more separation between the registration assembly and the transfer section. Confirm the PS_T2 designation in the PFTDB or MFPB section of the model-specific SM
Key Components	Second transfer section entry sensor (PS_T2 / model-specific — the sensor whose failure to trigger defines 30-01); pre-transfer guide plate (the guide between the registration nip exit and the secondary transfer roller nip — directs paper from the registration area into the second transfer zone); secondary transfer roller (T2 roller / STR — creates the nip with the ITB where paper receives the toner image; paper leading edge must enter this nip to trigger PS_T2); intermediate transfer belt (ITB — the belt surface at the second transfer nip; ITB edge condition and tension at the nip point affect paper entry); registration rollers and registration clutch CL4 (drive paper from registration nip toward the second transfer zone — confirmed activated but paper did not reach the destination); pre-fuser / fuser entry (downstream of second transfer — back-pressure source when fuser section is blocked); engine and imaging board controlling CL4 and PS_T2 (BASEB / FRB / EXCB / PFTDB)
Severity	High — all paper sources are disabled; 30-01 fires regardless of which tray was selected because the second transfer section is shared by all paper sources; paper found in the pre-transfer guide area or at the second transfer nip, typically clean and flat (stalled transport) or crumpled at the STR nip entry (paper drove into the nip but could not enter it); may co-occur with fuser section jam codes when downstream back-pressure is preventing second transfer clearance
Related Jam Codes	30-02 (second transfer section late arrival — paper reached second transfer area but arrived too slowly, loop-forming or transport timing issue), 30-04 (second transfer section clearance failure — paper arrived at PS_T2 but did not clear the sensor, paper stalled in the second transfer zone), 55-xx / 57-xx (fuser section jam codes — when fuser back-pressure is the root cause of 30-01 by preventing paper from advancing into and through the second transfer zone), 10-40 / 11-40 / 12-40 (WTEN timeout codes — for contrast, paper at registration but WTEN not issued), 10-04 (registration clearance fault — for contrast, paper stalled at registration exit, not at second transfer entry)

All Affected Models and Second Transfer Section Component References

Jam Code 30-01 primarily applies to bizhub color models equipped with an intermediate transfer belt (ITB) — the architecture in which toner is first transferred from the photoconductor drums to the ITB (primary transfer) and then from the ITB to the paper at the second transfer nip (secondary transfer). On monochrome models where paper passes directly through a single transfer section, the code structure may differ — consult the model-specific SM for the applicable jam code logic. The second transfer section entry sensor (PS_T2) is the most model-specific element — its exact PS designation, connector location, and Service Mode check code must be confirmed in the model-specific SM before any sensor check is performed. The pre-transfer guide and secondary transfer roller designation are also confirmed in the SM.

bizhub Color Models	Second Transfer Entry Sensor	PS_T2 Connector Reference	PS_T2 Check Code	Secondary Transfer Roller (STR) / T2 Roller	STR Engagement Mechanism	Pre-Transfer Guide Location	ITB Drive Motor	Second Transfer HV Source	Primary Controlling Board
C250i / C300i / C360i / 250i / 300i / 360i	PS_T2 (second transfer entry sensor — refer to BASEB I/O section of SM)	BASEB CN_T2 series — refer to SM	Refer to BASEB I/O section of SM	T2 roller (integrated in ITB unit or separate STR unit)	Cam or solenoid engagement — motor-driven cam positions STR against ITB on print; releases on standby	Between registration roller exit and STR nip — right-side inner cover area	M_ITB (ITB drive motor — within ITB unit assembly)	HVPS (High Voltage Power Supply) — T2 HV output; refer to SM	BASEB + HVPS
C3350i / C4000i / C4050i	PS_T2 — refer to BASEB I/O section of SM	BASEB CN_T2 — refer to SM	Refer to BASEB I/O section of SM	T2 roller (within ITB unit)	Motor-driven cam engagement	Right-side inner transport path between registration exit and ITB nip	M_ITB (within ITB unit)	HVPS T2 output — refer to SM	BASEB + HVPS
C258 / C308 / C368 / C227 / C287 / C367	PS_T2 — refer to FRB or MFPB section of SM	FRB CN_T2 or MFPB CN_T2 — refer to SM	Refer to FRB I/O section of SM	T2 roller / STR unit	Cam engagement (M_STR or motor-driven mechanism — refer to SM)	Inner right-side cover — pre-transfer guide between registration nip exit and STR	M_ITB (separate ITB drive motor or shared main drive — refer to SM)	HVPS T2 output — refer to SM	MFPB + FRB + HVPS
368e / 308e / 458e / 558e / 658e	PS_T2 — refer to FRB / EXCB section of SM	FRB / EXCB CN_T2 — refer to SM	Refer to FRB / EXCB I/O section of SM	T2 roller / STR	Cam or solenoid engagement — refer to SM	Inner right-side between registration and STR	M_ITB — refer to SM	HVPS T2 — refer to SM	MFPB + FRB + EXCB + HVPS
C458 / C558 / C658	PS_T2 — refer to EXCB or FRB section of SM	EXCB CN_T2 or FRB — refer to SM	Refer to EXCB / FRB I/O section of SM	T2 roller / STR unit	Motor-driven cam (M_STR or CAM_T2 — refer to SM)	Inner right-side; pre-transfer guide between registration exit and STR nip	M_ITB (ITB drive motor — refer to SM)	HVPS T2 output section — refer to SM	MFPB + FRB + EXCB + HVPS
C450i / C550i / C650i / 458i / 558i / 658i	PS_T2 — refer to BASEB or EXCB section of SM	Refer to SM	Refer to SM	T2 roller / STR	Refer to SM	Refer to SM	M_ITB — refer to SM	HVPS T2 — refer to SM	MFPB + EXCB + FRB + BASEB + HVPS
C224e / C284e / C364e / C224 / C284 / C364 / C454 / C554	PS_T2 — refer to PRCB or MFPB section of SM	Refer to SM	Refer to SM	T2 roller / STR	Refer to SM	Refer to SM	M_ITB — refer to SM	HVPS T2 — refer to SM	PRCB / MFPB + HVPS
C659 / C759	PS_T2 — refer to PFTDB / MFPB section of SM	Refer to SM	Refer to SM	T2 roller / STR	Refer to SM	Refer to SM	M_ITB — refer to SM	HVPS T2 — refer to SM	PFTDB + MFPB + HVPS

PS_T2 designations (second transfer entry sensor), STR engagement mechanism details, and all connector and check code references must be confirmed in the model-specific service manual. On MFPB platform models, the FRB or EXCB schematic is the primary reference for imaging-section sensor wiring. On BASEB i-series, the BASEB I/O section is the reference. On PFTDB platform models, consult the PFTDB and MFPB SM sections. Never perform a sensor check or component actuation in Service Mode without first confirming the exact check code in the SM — incorrect actuation commands in the transfer section area can damage the ITB surface or the STR engagement mechanism.

ℹ️ Three stop positions for 30-01 — each points to a different cause and different repair: Where the paper is found when 30-01 fires determines the entire diagnostic path. Establish the stop position before any Service Mode check or component inspection. Position A — paper found flat and stationary in the pre-transfer guide path, between the registration nip exit and the second transfer nip entry: The registration drive advanced the paper but the paper stalled before reaching the STR nip. Investigate the pre-transfer guide plates (Step 3) and paper condition/stiffness (Step 6). The registration drive is confirmed functional — the paper moved. The fault is in the guide path or at the STR entry geometry. Position B — paper found at or crumpled against the entry of the secondary transfer roller (STR) nip: The paper reached the STR entry but could not enter the nip. Investigate STR engagement position and pre-nip guide alignment (Step 4). If the paper’s leading edge is sharply folded against the STR, the STR was not correctly engaged or the pre-nip guide is directing paper at an angle that misses the nip. Position C — no paper found in the machine, or paper found at or past the second transfer sensor with PS_T2 showing OFF in Service Mode: The second transfer sensor (PS_T2) did not detect paper that reached or passed through its detection zone. Investigate PS_T2 for contamination or failure (Step 5). This is the only pattern where a hardware sensor replacement resolves 30-01 without any paper path mechanical intervention.

Understanding the Second Transfer Section — Why 30-01 Occurs

The second transfer section is where the complete YMCK toner image — assembled on the intermediate transfer belt (ITB) surface during the primary transfer phase from the four photoconductor drums — is electrostatically transferred onto the paper. This is the moment in the color bizhub imaging process where paper and image first meet, and the geometry of how the paper enters this zone is more mechanically demanding than any other paper path transition in the machine.

The paper’s journey from the registration nip to the second transfer sensor involves three distinct mechanical events, each of which can fail and produce 30-01:

1. The registration exit transition: When CL4 fires and the registration rollers drive the paper forward, the paper leading edge exits the registration nip and immediately enters the pre-transfer guide path. This transition — from the registration nip’s controlled nip environment to the open guide path — requires the paper to maintain its travel direction without the support of the nip. Paper with significant curl may deflect off the guide surface at this point rather than following the guide toward the second transfer nip
2. The pre-transfer guide path: The pre-transfer guide (or registration exit guide) is a precisely shaped guide plate that directs the paper from the registration nip exit to the secondary transfer roller entry at exactly the angle required for the paper leading edge to enter the ITB-to-STR nip cleanly. This guide is the most critical mechanical element in the 30-01 fault zone. If displaced by even a few millimeters from its mounting position, the paper leading edge catches on the guide’s leading edge rather than following the guide surface into the STR nip — stalling the paper before it reaches PS_T2. Displacement of this guide is the single most common hardware cause of 30-01 following a jam clearing event in the registration or transfer area
3. The secondary transfer roller (STR) nip entry: The paper leading edge must enter the nip between the ITB surface and the secondary transfer roller (T2 roller) — a nip that, at the moment the paper arrives, is the meeting point between a moving belt surface (the ITB) and a spring-loaded or cam-engaged roller. If the STR is not correctly engaged at the correct pressure and position, the nip geometry is incorrect — the paper leading edge either misses the nip entrance entirely (driven against the STR side face rather than into the nip) or enters the nip at an angle that creates a fold rather than a clean entry

Five root cause categories produce 30-01, ordered by frequency in field-installed bizhub color machines:

• Category 1 — Pre-transfer guide plate displaced or damaged (dominant cause of sudden-onset 30-01, particularly following a jam clearing event): The pre-transfer guide plate — the critical guide between the registration nip exit and the STR nip entry — has been dislodged from its mounting tabs, bent, or cracked. This is the most commonly displaced guide in the entire bizhub paper path because it is located adjacent to the most common jam clearance zone (the registration-to-transfer area) and is vulnerable to being caught by paper being forcefully removed from a jam. A pre-transfer guide that is dislodged by only 2–3mm from its correct position presents a sharp edge perpendicular to the paper travel direction — the paper leading edge catches on this edge, folds against it, and stalls. Because the guide is inside the imaging section (accessed through the front door or right cover rather than the transport access panels), it is frequently missed during a jam inspection that focuses on the transport section. A 30-01 that appeared immediately after clearing a jam in the registration or transfer area has a dislodged pre-transfer guide as the primary suspect until visually confirmed otherwise
• Category 2 — Secondary transfer roller (STR) engagement position fault: The STR is not correctly engaged against the ITB surface, or is engaged at an incorrect pressure or angular position relative to the ITB contact point. The STR on most bizhub models is positioned by a cam mechanism that moves the roller between an engaged (printing) position and a disengaged (standby / cleaning) position. If the cam mechanism has worn, the cam motor has partially failed, or the STR mounting bracket has shifted, the STR nip geometry changes — the gap between the STR surface and the ITB is either too large for paper to enter cleanly, or the STR is presenting its edge rather than its face to the incoming paper leading edge. This category produces 30-01 consistently from all paper sources and is frequently accompanied by transfer quality defects on the prints that do complete (if any do) — the STR at incorrect position degrades image transfer quality at the same time it obstructs paper entry
• Category 3 — Paper jam fragment lodged at the STR nip entry or pre-transfer guide: A paper fragment torn from a previous jam is lodged in the pre-transfer guide area or at the STR nip entry. Every subsequent sheet drives into the fragment, folds against it, and stalls before reaching PS_T2. This category is confirmed by the paper’s stop position — sharp fold at a specific point that is the same across multiple consecutive 30-01 events — and the fragment is found at that fold point when the access panel is fully opened and the guide area is inspected with a flashlight. Fragment lodgment at the STR nip entry is particularly common because the narrow gap between the guide and the STR surface traps small fragments that are not visible from the standard access panel opening angle
• Category 4 — Paper condition: severe curl, stiffness incompatibility, or incorrect weight: Paper with severe curl (particularly downward curl of the leading edge — concave on the underside) deflects downward at the registration exit rather than following the pre-transfer guide into the STR nip. Thick cardstock or board above the machine’s rated maximum paper weight cannot navigate the registration-exit-to-STR-entry guide geometry at the speed and force of the registration drive. Very thin or limp paper below the minimum specification cannot maintain its travel direction across the open section of the pre-transfer guide path. Paper condition as a cause of 30-01 is confirmed when the code fires consistently on specific media types but not on standard plain paper from the same source tray — media change resolves the fault without any hardware repair
• Category 5 — Second transfer sensor (PS_T2) contamination or failure (produces false 30-01 — paper reached the zone but was not detected): The PS_T2 sensor window is contaminated with toner or paper dust — common in the second transfer area where loose toner from the ITB surface is present — or the sensor has electrically failed in the OFF state. Paper reaches and passes through the second transfer sensor zone but PS_T2 does not trigger. The timing window expires and 30-01 fires despite the paper having transported correctly. This category is confirmed by Position C stop position (no paper found in the pre-transfer path, or paper found at or past the PS_T2 location) and by verifying PS_T2 fails to trigger when paper is manually inserted into its detection zone in Service Mode

Step 1 — Clear the Paper, Confirm the Stop Position, and Classify the Pattern

Stop position classification for 30-01 is more mechanically complex than for earlier codes in this series because the second transfer section access requires opening imaging section covers — not just transport covers. Careful paper observation before removal identifies the stop position pattern and directs the repair before any component is touched.

1. The jam indicator on the operator panel for 30-01 typically indicates the right-side front cover, the inner right cover, and sometimes the front door of the machine simultaneously — the jam zone spans the registration exit and the second transfer section, which is accessed from multiple covers depending on the model. Open all indicated covers in the sequence specified by the operator panel (on color bizhub models, the front door typically releases the ITB access; the right cover releases the registration area access). Do not force any cover if it does not open freely — the ITB unit lock and the STR engagement mechanism are mechanically linked to specific cover positions on most models, and forcing a cover out of sequence can damage the STR engagement cam or the ITB surface
2. Before removing the paper, observe precisely:
   • Where is the paper’s leading edge — in the pre-transfer guide path, at the STR nip entry, or at or past the PS_T2 detection zone?
   • Where is the paper’s trailing edge — in the registration nip, exiting the registration nip, or in the pre-transfer guide path?
   • What is the paper’s physical condition — flat and undamaged (stalled transport), crumpled at a specific point (obstruction contact), or folded at the STR entry (nip entry failure)?
3. Classify the stop position pattern:
   • Position A — Paper flat and stationary in the pre-transfer guide area, between the registration nip exit and the STR nip: The registration drive advanced the paper into the guide area but the paper stalled before entering the STR nip. The fault is in the guide path: a displaced pre-transfer guide plate (Category 1), a lodged fragment at the guide (Category 3), or paper curl/stiffness preventing the paper from following the guide (Category 4). Proceed to Step 3 (guide plate inspection)
   • Position B — Paper leading edge crumpled or folded at the entry of the STR nip, paper could not enter the nip: The paper reached the STR entry but the nip geometry prevented entry — the paper leading edge drove against the edge of the nip rather than into it. The STR engagement position is the primary suspect (Category 2). Also check the pre-nip guide alignment (Step 4). Proceed to Step 4 (STR inspection)
   • Position C — No paper found in the pre-transfer path; or paper found at or past PS_T2 location with PS_T2 reading OFF in Service Mode: The paper transported correctly but PS_T2 failed to detect it. Toner or paper dust contamination of the PS_T2 sensor window is the most common cause. Proceed to Step 5 (PS_T2 sensor verification). Note: if no paper is found at all and the registration area is also clear, the registration drive may have completely failed to advance the paper — verify CL4 operation in Step 7
4. Remove the jammed paper carefully, always pulling in the direction of paper travel. Critical for the second transfer area: never pull paper against the ITB surface. The ITB surface is a precision belt that scratches permanently from paper being dragged against it. If the paper is wrapped around or pressed against the ITB surface, release the STR engagement first (using the STR release lever or knob specified in the SM for the model) before pulling the paper. Even a light scratch on the ITB surface produces a permanent vertical stripe print defect that requires ITB replacement
5. After removing the paper, inspect the pre-transfer guide area and STR nip entry zone with a flashlight before closing any cover. Look specifically for:
   • Paper fragments at the STR nip entry — the gap between the pre-transfer guide and the STR is a common fragment trap that is invisible without the flashlight-angle inspection
   • Guide plate mounting tabs — confirm the pre-transfer guide is seated with both mounting tabs engaged and no raised leading edge
   • Toner accumulation at the PS_T2 sensor window — toner deposit on the sensor window is visible as a dark smear across the sensor aperture

Step 2 — Review Service History and Fault Pattern

The fault pattern for 30-01 provides rapid root cause identification before any component is opened or tested.

1. Access the Error History log in Service Mode and review the last 20–50 events:
   • 30-01 appeared immediately after clearing a previous jam from the registration area, transfer section, or pre-fuser area: A pre-transfer guide displaced during the jam clearing, or a paper fragment lodged at the STR nip entry during the clearing event. This is Category 1 or 3. Proceed immediately to Step 3
   • 30-01 consistent from all paper sources with no recent jam history; may be accompanied by transfer quality defects (streaks, uneven density) on prints that do complete: STR engagement position fault (Category 2). A mis-positioned STR degrades image transfer quality at the same time it obstructs paper entry. Print quality defects and 30-01 co-occurring is the diagnostic signature of an STR engagement problem. Proceed to Step 4
   • 30-01 with no paper found in the machine; PS_T2 shows OFF in Service Mode with path clear: PS_T2 contamination or failure (Category 5). Proceed to Step 5
   • 30-01 only on specific media types; plain paper from the same source tray feeds normally: Paper condition or weight incompatibility (Category 4). Proceed to Step 6
   • 30-01 after ITB replacement, STR replacement, or any imaging section maintenance: A component not fully reseated, a guide not correctly reinstalled after access, or an engagement mechanism not correctly repositioned after the maintenance intervention. Systematically inspect all reinstalled components in the second transfer area before testing
   • 30-01 accompanied by fuser section jam codes (55-xx, 57-xx) in the same error session: Fuser back-pressure preventing paper from advancing into and clearing the second transfer zone. Resolve the fuser section fault first — the 30-01 will clear when the downstream path is open
2. Review the service log for recent imaging section interventions: ITB replacement, STR replacement, drum unit replacement, front door or right cover replacement, or any intervention requiring the pre-transfer guide to be removed or repositioned. These interventions directly access the 30-01 fault zone components
3. Check the ITB copy counter and the STR counter in Service Mode against the PM replacement intervals in the SM. An ITB at or past its PM replacement interval has degraded belt surface tension and belt edge integrity that can affect the second transfer nip geometry — a worn ITB belt edge may present an inconsistent surface at the STR nip that catches paper leading edges intermittently
4. Confirm whether 30-01 fires from all paper sources or only from specific sources. 30-01 is a shared-path code — because all sources route through the same second transfer section, a hardware fault in this zone produces 30-01 from every source. A 30-01 that fires from only one specific source while all others print normally suggests the fault is source-specific — the paper from that source follows a different approach angle to the pre-transfer guide and is exposed to a guide defect or paper condition issue that sources with different entry angles do not encounter

Step 3 — Inspect Pre-Transfer Guide Plates and the Registration Exit Path

The pre-transfer guide is the highest-priority hardware inspection for all Position A stops and for any 30-01 that appeared after a jam clearing event. This guide is the most commonly displaced component in the second transfer fault zone and is the root cause of the majority of 30-01 calls that follow jam clearing events in the registration and transfer area.

1. With all covers open providing access to the registration exit and pre-transfer zone (per the model SM — typically the front door and the inner right cover together), locate the pre-transfer guide plate. This guide is positioned between the registration roller nip exit and the secondary transfer roller nip entry. On most bizhub color models, it is a precisely contoured plastic or metal guide that arcs from the registration roller exit downward (or horizontally) into the STR nip entry zone. On some models it is a single plate; on others it is a multi-section guide assembly
2. Inspect the pre-transfer guide mounting with a flashlight:
   • Each mounting tab of the pre-transfer guide must be fully engaged in its retaining slot. A guide with one tab displaced presents a visible step where the guide surface meets the adjacent machine structure — a raised edge that catches paper leading edges
   • The guide surface must be flat and continuous with no raised edges at the transitions between guide sections. On multi-section guide assemblies, verify each section is correctly nested against the adjacent section with no gap or step at the joint
   • Inspect the guide for cracks — a cracked guide may appear correctly mounted but flexes under paper contact, momentarily presenting a sharp edge into the paper path
   • Inspect the guide’s leading edge (the edge closest to the registration nip exit) for bent or deformed sections. The leading edge is the first point of paper contact — a bent leading edge deflects paper in the wrong direction immediately on registration exit
3. Inspect the entire pre-transfer guide surface area with the flashlight directed at multiple angles to reveal fragments not visible from a straight-on view:
   • Paper fragments as narrow as 5–8mm lodged at the guide’s leading edge or at any step in the guide surface produce consistent 30-01 without being visible from a direct viewing angle. The side-angle flashlight inspection is essential — direct the beam along the guide surface rather than perpendicular to it
   • Use non-metallic tweezers to remove any fragment found. Do not use metal tools in the transfer zone area — metal contact with the ITB surface or the STR surface produces immediate damage
   • After fragment removal, run the flashlight inspection again — a primary fragment often has secondary smaller fragments nested behind it that were not visible with the primary fragment in place
4. Reseat the pre-transfer guide if any displacement is found:
   • Press each mounting tab firmly into its retaining slot until it clicks. Confirm the guide surface is flush with the adjacent guide and machine surfaces along its full length
   • Run a 5-page test print from any tray after reseating the guide. A correctly seated pre-transfer guide resolves Position A stops immediately — the first test print confirms whether the guide was the cause
5. Clean the pre-transfer guide surface with a dry lint-free cloth:
   • Toner accumulation on the pre-transfer guide surface (particularly on the underside, facing the ITB) increases the surface friction against the paper leading edge, creating drag that can slow or stall the paper before it reaches the STR nip
   • Do not use alcohol or solvent cleaners on plastic guide components — these attack the plastic and cause warping over time
6. Replace the pre-transfer guide if it is cracked, has a broken mounting tab, or cannot be correctly seated. A pre-transfer guide with a broken mounting tab is permanently vulnerable to displacement on every subsequent jam clearing event in the area — replacement is preferable to reseating a guide that cannot hold its position reliably

Step 4 — Inspect the Secondary Transfer Roller (STR) Engagement and Nip Geometry

For Position B stops (paper crumpled at the STR nip entry) and for consistent 30-01 accompanied by transfer quality defects, the STR engagement position and nip entry geometry are the primary investigation targets. The STR on bizhub color models is a precision component — its position relative to the ITB surface determines both image transfer quality and paper entry geometry simultaneously. A mis-positioned STR degrades both.

1. With the front door open and the STR accessible (per the model SM — on most models the STR is part of the ITB unit or is accessed through the front door opening), visually inspect the STR engagement position:
   • The STR should be pressed evenly against the ITB surface across its full width. On most bizhub models, the STR contact is visible at the second transfer nip point — the belt and roller should be in firm contact with no visible gap between them when the machine is in print-ready state
   • Check for any visible axial shift of the STR — the roller should be centered on the ITB width with equal clearance on both sides. An axially shifted STR may engage correctly on one side but present a gap on the other, producing one-sided paper entry failure and paper skew at the second transfer entry
   • Check that the STR engagement cam (the cam mechanism that moves the STR between engaged and disengaged positions) is fully in the engaged position. On machines where the front door opening automatically disengages the STR, confirm the cam returns to the engaged position when the door is closed — a worn cam or failed cam return spring leaves the STR in the partially disengaged position after the door closes
2. In Service Mode, navigate to the STR engagement check. Command the STR to engage (using the model-specific check code from the SM) and verify:
   • The STR engagement mechanism completes a full engagement cycle — on motor-driven cam models, the cam motor should run to the engagement position and stop; listen for the engagement click or motor stop
   • After engagement, the STR should be in firm, even contact with the ITB surface. If the STR engagement sequence completes but the STR is not visibly in contact with the ITB, the cam has worn beyond the engagement threshold or the STR mounting bracket is shifted
3. Inspect the nip entry geometry — the path that the paper leading edge must follow to enter between the STR and the ITB:
   • The pre-nip guide (the guide immediately before the STR nip, directing paper into the nip) must align precisely with the nip entry. A pre-nip guide that is angled even slightly upward directs the paper toward the STR side face rather than into the nip — the paper’s leading edge drives into the roller surface and folds
   • Confirm the pre-nip guide angle and alignment per the SM illustration for the model. On most models, this guide has a specific mounting position that is factory-set — if it has been disturbed, it must be returned to the factory position, not to any position that “looks right”
4. Inspect the STR surface condition:
   • The STR surface should be clean, uniform, and free of toner accumulation. Toner on the STR surface reduces the electrical contact quality for the high-voltage transfer and may also change the nip surface geometry at the paper entry point
   • On most bizhub models, the STR is cleaned automatically by the ITB cleaning mechanism — if toner is accumulating on the STR surface, the cleaning mechanism may have partially failed. Investigate the STR cleaning blade condition if toner accumulation is observed
   • A damaged STR surface (cuts, cracks, or flat spots) affects both transfer quality and nip geometry. Replace the STR if surface damage is found
5. Inspect the ITB surface at the second transfer nip area:
   • The ITB surface at the second transfer nip must be clean and undamaged. A torn or lifted ITB belt edge at the nip entry presents a physical obstruction that the paper leading edge catches against — a common cause of Position B stops where the paper leading edge folds immediately on nip entry contact with the damaged belt edge
   • A torn ITB belt edge is visible as a raised section of the belt surface at the nip entry point. Replace the ITB if belt edge damage is confirmed — a damaged belt edge cannot be repaired in the field and will produce 30-01 on every print from every source until replaced
   • Toner accumulation on the ITB surface at the nip entry (outside the normal image area) affects the surface friction at the paper entry point and changes the effective nip pressure for the first few millimeters of paper entry. Clean the ITB surface in the non-image area at the nip entry with a dry lint-free cloth if accumulation is visible — do not apply any cleaning agent to the ITB surface

Step 5 — Inspect and Verify the Second Transfer Sensor (PS_T2) in Service Mode

PS_T2 inspection directly addresses Position C faults. It is also a mandatory verification step before any component replacement is completed — a PS_T2 sensor stuck in the OFF state produces 30-01 on every print regardless of the mechanical condition of every other component in the second transfer area.

1. Enter Service Mode and navigate to the I/O check for the second transfer section. Locate PS_T2 (confirm the exact designation in the model-specific SM before proceeding — the PS designation varies by model platform). Verify the current sensor state with the paper path confirmed clear and the ITB and STR in the print-position state (front door and covers closed, machine at ready):
   • PS_T2 shows OFF (no paper detected) with path clear: The sensor is correctly reading an empty path. Proceed with the position-appropriate diagnostic step. Position C is excluded
   • PS_T2 shows ON (paper detected) with path clear: The sensor is stuck in the triggered state — either from a jammed actuator flag, from a paper fragment in the sensor aperture, or from sensor electrical failure. A sensor stuck ON at the start of a feed cycle prevents the machine from initiating a new feed because it believes paper is already at the second transfer position. Proceed with sensor inspection below
2. Inspect the PS_T2 sensor window for toner contamination:
   • Toner contamination of PS_T2 is significantly more common in the second transfer area than sensor contamination in any paper feed area, because the second transfer zone is directly adjacent to the ITB surface from which loose toner particles are continuously released during operation. The sensor window in this area can accumulate a toner film that progressively reduces beam transmission, producing intermittent false detection events (intermittent 30-01) before progressing to consistent sensor failure
   • Clean the PS_T2 sensor window with a dry lint-free cloth. Remove loose toner carefully — do not blow compressed air at the sensor window in the second transfer area, as this disperses toner onto the ITB surface and into the STR nip. Use the cloth tip or a dry cotton swab to remove toner from the sensor aperture
   • Recheck PS_T2 state in Service Mode after cleaning. A sensor that returns to correct OFF-state function after toner cleaning was experiencing contamination-induced threshold failure. Monitor the sensor at the next PM visit — a sensor that accumulates toner to the failure threshold within one PM cycle should be proactively replaced at the next PM, as the contamination rate in its position will return it to failure quickly
3. Manually insert a piece of paper into the PS_T2 detection zone (with the machine powered off or in Service Mode sensor check) and verify the sensor transitions to ON. Remove the paper and verify it returns to OFF. This two-way test confirms both directions of sensor operation — a sensor that only triggers in one direction has partially failed
4. Reseat the PS_T2 harness connector at the controlling board (FRB / EXCB / BASEB / PFTDB — per SM). Toner dust in the second transfer area can also deposit on harness connector mating surfaces, creating resistive connections that intermittently fail the sensor signal
5. Replace PS_T2 if stuck OFF (fails to trigger with paper in aperture after cleaning and connector reseating), stuck ON (fails to clear after fragment removal and actuator inspection), or if the two-way test shows only one-directional function. After replacement, verify the new sensor toggles correctly in Service Mode before running a print test

Step 6 — Inspect Paper Condition and Confirm Media Specification

When 30-01 fires only on specific paper types while standard plain paper feeds normally from the same source, paper condition or weight is the root cause — not a hardware failure. This is more commonly a bypass tray issue (where non-standard media is more likely) but can occur with cassette-loaded media that has developed curl from moisture, age, or fuser heat from duplex jobs.

1. Identify the paper stock producing 30-01 and check it against the machine’s specified paper weight range for the source tray in use. Most bizhub color models specify 60–90 g/m² as the standard range for cassette trays, with up to 220–300 g/m² for the bypass tray on heavy stock settings. Paper above the maximum produces 30-01 from stiffness — the paper cannot navigate the registration-exit-to-STR-nip arc at the registration drive’s nominal speed and force
2. Inspect the paper for curl. Paper curl in the downward direction (leading edge curves downward — concave on the print-face side) causes the leading edge to deflect off the pre-transfer guide surface at the registration exit rather than following the guide into the STR nip. Check the curl by placing a sheet flat on a horizontal surface — the corners should not lift more than 10–15mm from the surface for reliable transport. Paper with corners lifting more than 20mm will consistently produce 30-01
3. For paper that shows curl from fuser heat (second-side feeds, or paper that has been in the output tray and been reloaded): fan the paper and allow it to condition at room temperature for 10–15 minutes before reloading. On models with a curl correction mode in Service Mode or the print driver, enable this mode for the affected media type
4. For coated paper producing 30-01: verify the machine’s paper type setting for the source tray matches the loaded media. On bizhub color machines, the paper type setting affects the pre-fuser and fuser temperature settings, the ITB drive speed, and in some cases the registration-to-transfer timing. A coated paper setting uses different transport parameters than a standard plain paper setting. Mismatched paper type settings can cause 30-01 if the transport speed or timing parameters are incorrect for the actual media
5. Run a controlled comparison: 10 sheets of confirmed-specification plain paper from the same source tray. If plain paper feeds without 30-01 while the customer’s paper produces 30-01, media is confirmed as the root cause. Document the paper specifications and settings adjustment in the service log

Step 7 — Verify the Registration Drive and CL4 Engagement

When the stop position is Position C (no paper found, path clear) and PS_T2 is confirmed functional (correctly transitions in both directions in Service Mode), the registration drive may have failed to advance the paper from the registration nip at all — the paper was at the registration nip when CL4 was commanded but did not move. This produces 30-01 because PS_T2 was never triggered, but the fault is not at the second transfer zone — it is at the registration drive, identical in mechanism to the registration drive failures discussed in the 10-04 article. This is the least common cause of 30-01 but must be excluded when Position C is confirmed and PS_T2 is functional.

1. In Service Mode, command CL4 to engage using the CL4 check code from the component table (confirmed in SM). Listen for the firm engagement click:
   • Firm engagement click, registration rollers lock: CL4 is functional. The registration drive was not the cause of Position C 30-01. Recheck the machine setup and run a test print — Position C with functional PS_T2 and functional CL4 suggests the 30-01 was produced by a transient event (paper folded and partially ejected during the failed advance, leaving no visible jam) that may not recur
   • Soft or absent engagement, registration rollers do not lock: CL4 partial engagement failure or coil failure. Measure CL4 coil resistance per the SM specification. Replace CL4 if coil resistance is outside specification or if torque is insufficient despite correct coil resistance (mechanical engagement wear)
2. Inspect the registration roller surfaces for glazing (per the criteria established in the 10-04 article Step 5). A glazed registration roller that produces 10-04 on bypass tray feeds may also produce Position C 30-01 on cassette feeds — the same roller glazing that prevents bypass clearance prevents registration-to-second-transfer drive on all sources. Inspect and replace if glazed
3. Verify that the fuser section is not producing back-pressure that propagates upstream to the second transfer area. If there is a paper fragment from a previous jam lodged at the fuser entry, paper driven by CL4 cannot advance into and through the second transfer zone — it backs up against the fuser entry blockage and 30-01 fires. Check the fuser pre-entry guide for lodged fragments (Step 3 methodology applied to the fuser entry zone)

Quick Reference — Troubleshooting by Symptom

Symptom	Stop Position	Most Likely Cause	First Action
30-01 appeared immediately after clearing a previous jam from the registration or transfer area; fires on every print from every source	A (pre-transfer guide path)	Pre-transfer guide plate displaced by forceful paper removal during previous jam clearing — single most common cause of sudden-onset 30-01	Inspect pre-transfer guide with flashlight at multiple angles; confirm both mounting tabs are seated; check for fragments at the guide leading edge and at the STR nip entry; reseat guide if displaced; run 5-page test
30-01 consistent from all sources; accompanied by transfer quality defects (color streaks, uneven density, light areas in image) on prints that do complete	B (STR nip entry)	STR engagement position fault — STR not correctly positioned against ITB surface; mispositioned STR degrades transfer quality and obstructs paper nip entry simultaneously	Inspect STR contact with ITB — confirm even contact across full width; command STR engagement in Service Mode and verify engagement completes fully; inspect STR cam mechanism; replace STR or adjust mounting if engagement is confirmed incomplete
30-01 with paper leading edge sharply folded at the STR nip entry; paper made it through the pre-transfer guide but couldn’t enter the nip	B (STR nip entry)	STR nip entry geometry incorrect — paper directed into STR side face rather than into nip; or ITB belt edge lifted at nip entry catching paper leading edge	Inspect pre-nip guide alignment per SM illustration; inspect ITB belt edge at nip entry for lifted or torn belt edge; if ITB edge is torn, replace ITB unit
30-01 with no paper found; PS_T2 shows OFF in Service Mode with path clear; PS_T2 does not trigger on paper insertion	C (sensor failure)	PS_T2 sensor toner contamination or electrical failure — paper may be transporting correctly but sensor is not detecting it	Clean PS_T2 sensor window with dry lint-free cloth; reseat PS_T2 harness connector; verify sensor triggers correctly on paper insertion in Service Mode; replace PS_T2 if stuck OFF after cleaning
30-01 with no paper found; PS_T2 shows ON in Service Mode with path clear	C (sensor stuck ON)	PS_T2 sensor stuck ON — paper fragment in sensor aperture, stuck actuator flag, or sensor electrical failure in triggered state	Inspect PS_T2 aperture for fragment with flashlight; clean sensor window; inspect actuator flag for jam; replace PS_T2 if stuck ON persists after inspection and cleaning
30-01 only on specific paper types (heavy stock, coated paper, curled paper); plain paper feeds normally from same source	A (media interaction)	Paper condition or weight incompatibility — paper cannot navigate registration-exit-to-STR-nip arc at registration drive force for that media type	Verify paper weight against bypass/cassette specification in SM; inspect paper for downward curl of leading edge; switch to within-specification plain paper; enable curl correction mode in Service Mode if available; advise customer on correct media specification
30-01 after ITB unit replacement	A or B	ITB unit not correctly seated after replacement — ITB position affects both the pre-transfer guide clearance and the STR nip geometry	Verify ITB unit is fully locked into its mounting rails per SM installation procedure; confirm ITB drive engagement; run color registration auto-adjust after ITB installation before running paper test
30-01 after STR replacement	B	STR mounting bracket not correctly positioned, or STR cam mechanism not reset to correct engagement position after replacement	Verify STR mounting per SM installation procedure; run STR engagement cycle in Service Mode; confirm STR nip contact with ITB is even across full roller width
30-01 intermittent — 1 in 30–80 pages; escalating over weeks; PS_T2 borderline contamination confirmed by cleaning resolution	C (intermittent sensor)	PS_T2 toner accumulation on sensor window is progressive — sensor is at the threshold between correct detection and failure; intermittent 30-01 escalates to consistent as contamination builds	Clean PS_T2 window; add PS_T2 window cleaning to monthly maintenance schedule between PM visits; at next PM, replace PS_T2 proactively if the contamination rate suggests it will fail before the following PM interval
30-01 accompanied by fuser section jam codes (55-xx, 57-xx) in the same error session	A or B (secondary)	Fuser section entry blockage creating back-pressure — paper cannot advance into and clear the second transfer zone because the fuser entry is blocked; 30-01 and fuser jam are the same fault event, not independent faults	Resolve the fuser section obstruction first — clear the fuser pre-entry guide fragment; the 30-01 will clear when the downstream path is unobstructed
30-01 on every source; ITB at or past PM replacement counter	A or B	ITB belt edge deterioration at the second transfer nip — worn or frayed belt edge catching paper leading edges; or ITB tension degradation affecting the nip geometry	Inspect ITB belt edge at the second transfer nip point for lifting, fraying, or tearing; replace ITB unit if belt edge damage is confirmed; run color registration calibration after ITB replacement

Understanding the 30-xx Second Transfer Section Jam Code Family

Jam Code 30-01 belongs to the 30-xx second transfer section code family — the complete set of fault codes originating at the zone where the ITB toner image transfers to the paper. The suffix digit applies the same consistent logic used throughout the bizhub jam code family:

• 30-01 — Second transfer section misfeed — paper did not arrive at the second transfer section entry sensor (PS_T2) within the timing window after CL4 activated. Mechanical paper transport failure in the pre-transfer guide path and STR nip entry zone. The entire preceding paper journey (source feed, VT section, registration, WTEN handshake, CL4 activation) is confirmed successful. Investigate pre-transfer guide condition, STR engagement position, paper fragments in the guide path, ITB belt edge condition, PS_T2 sensor state, and paper media condition. This article
• 30-02 — Second transfer section late arrival — paper reached the second transfer section but arrived too late, outside the timing window required for correct image-to-paper synchronization. Paper may arrive at PS_T2 correctly but with timing that does not match the ITB image position — either the paper travelled too slowly through the registration-to-transfer path, or the registration timing parameters are mismatched for the media type. Investigate registration timing adjustment in Service Mode, pre-transfer guide friction (excessive guide surface friction slowing transport without fully stopping it), and heavy media setting configuration. Paper is found at or just into the second transfer nip, but with the toner image displaced from its expected position on the paper
• 30-04 — Second transfer section clearance failure — paper arrived at PS_T2 (sensor triggered ON) but PS_T2 was not unblocked within the timing window after the paper should have advanced through the second transfer zone. The paper stalled at or within the second transfer nip rather than advancing to the fuser. Investigate STR nip conditions (incorrect nip pressure trapping the paper), fuser entry guide obstructions creating immediate back-pressure, and paper type creating unexpected friction with the ITB surface in the nip zone. Paper is found folded within the second transfer nip, with the leading edge attempting to enter the fuser path

The 30-xx suffix logic mirrors the complete bizhub jam code suffix system: -01 = paper did not arrive at the section sensor; -02 = paper arrived but arrived too late; -04 = paper arrived and sensor triggered but paper did not clear the sensor. Each suffix maps to a distinct failure stage and requires a distinct diagnostic approach. The 30-xx family adds a dimension not present in feed-path families: the ITB and STR are imaging components, not transport components, and their condition affects both print quality and paper transport simultaneously — a 30-01 accompanied by print quality defects almost always points to an STR or ITB condition issue rather than a guide plate or sensor issue.

Preventing Jam Code 30-01 From Recurring

• Adopt a pre-transfer guide inspection as a mandatory step in every jam clearing procedure in the registration and transfer area. The pre-transfer guide is displaced in a significant fraction of jam clearing events where the paper being cleared spans the registration-to-transfer zone, because the paper acts as a lever that catches and lifts the guide’s leading edge as it is pulled through. Adding “confirm pre-transfer guide tab seating” to the jam clearing checklist — a five-second visual check after paper removal, before any cover is closed — eliminates Category 1 as a recurring cause entirely. On machines with frequent jams in the registration-to-transfer zone, laminate an instruction card on the inner right cover reminding operators to check the guide after clearing
• Include PS_T2 sensor window toner cleaning at every PM visit. The second transfer area accumulates toner on sensor windows at a higher rate than any paper feed area, because the ITB surface continuously releases micro-particles of residual toner during operation. A PS_T2 that is clean at one PM visit will have measurable toner accumulation by the next, and the accumulation is progressive. Including a PS_T2 window cleaning — with a dry lint-free cloth, never compressed air in the transfer zone — in the standard PM sensor cleaning sequence prevents progressive contamination from reaching the failure threshold. A 30-second cleaning investment per PM prevents intermittent 30-01 escalation calls
• Run color registration auto-adjust after every ITB replacement, every STR replacement, and any imaging section intervention that moves or reseats these units. The ITB and STR positions directly affect the second transfer nip geometry. A freshly installed ITB or STR that is not verified at the correct engagement position after installation will produce 30-01 or transfer quality defects from the first print. The Color Registration Auto Adjust procedure in Service Mode confirms the ITB and STR are at the correct positions and adjusts timing parameters to match the actual installed geometry. Never skip this procedure after ITB or STR installation — the procedure exists specifically to catch and correct position variations introduced during installation
• Check the pre-transfer guide seating whenever any right-side inner cover is opened for any reason. The pre-transfer guide’s mounting tabs are accessible and can be disturbed whenever the inner right cover is opened — including during PM visits, toner replacement procedures, and drum unit replacement on some models. Incorporating a pre-transfer guide seating check into the standard close-out procedure for any inner right cover access prevents guide displacement from becoming a source of post-PM 30-01
• Monitor the ITB belt edge at the second transfer nip point during PM inspections on machines above 300k copies. The ITB belt edge at the second transfer nip accumulates wear from the secondary transfer roller contact on every sheet fed through the machine. On machines above 300k copies, the belt edge in the contact zone begins to develop micro-tears and lifting that are not yet visible as print defects but produce intermittent 30-01 as paper leading edges catch on the lifting edge. Inspecting the belt edge with a flashlight during PM — looking for any section of the belt edge that is not flat and smooth at the nip point — identifies early edge deterioration before it progresses to consistent 30-01. Proactive ITB replacement at first belt edge lifting prevents an unscheduled 30-01 outage call
• Document paper type settings in the service log whenever a customer changes their standard paper stock. 30-01 from paper media incompatibility appears when a customer changes from one paper stock to another — particularly when moving to a heavier or more heavily coated stock — without adjusting the machine’s paper type settings. A service log note that records “standard media is 80 g/m² uncoated, Tray 1 paper type set to Plain” allows the next attending technician to immediately identify whether a paper type change is in the fault timeline when investigating a 30-01 call

Professional Technician Summary

Jam Code 30-01 is the second transfer section misfeed — paper failed to reach the second transfer section entry sensor (PS_T2) within the timing window after the registration clutch fired to drive the paper from the registration nip. This code fires at the deepest point in the paper path of any code in this series, and everything that preceded it in the paper journey — source feed, vertical transport, registration, WTEN handshake, CL4 activation, and full imaging section readiness — has been confirmed successful. The fault zone is specific: the physical path between the registration nip exit and the second transfer sensor. The diagnostic scope is correspondingly narrow: the pre-transfer guide plate, the STR entry geometry, the PS_T2 sensor, paper media condition, and the ITB belt surface at the nip.

The pre-transfer guide is the first component to inspect on any 30-01 call that appeared after a jam clearing event. This guide is the most commonly displaced component in the machine’s imaging section, dislodged by the mechanical leverage of paper being pulled from the registration-to-transfer jam zone. Its displacement is the dominant cause of sudden-onset 30-01 on every bizhub color model, and its inspection takes 30 seconds with a flashlight. Inspect it before opening Service Mode, before measuring any component, and before ordering any part. Confirm both mounting tabs are seated; run a 5-page test. If 30-01 clears, a guide reseat was the entire repair.

A 30-01 accompanied by transfer quality defects points immediately to the STR. The STR at an incorrect engagement position simultaneously degrades toner-to-paper transfer quality and obstructs the paper entry geometry at the second transfer nip. No other 30-01 cause produces print quality defects alongside the jam code. When a customer reports that prints have been showing streaks, light areas, or color imbalance AND the machine is now producing 30-01, the STR is the working diagnosis before any diagnostic step is performed.

PS_T2 toner contamination is the most preventable recurring cause of 30-01. The second transfer area deposits toner on sensor windows faster than any other zone in the machine. A PS_T2 that is cleaned at every PM visit does not produce contamination-threshold failure. A PS_T2 that is cleaned only when it fails produces intermittent 30-01 callbacks between PM visits. The difference is 30 seconds of cleaning time per PM visit — add it to the PM checklist and document it in the service log.

Never investigate board-level or firmware causes for 30-01. WTEN was issued before 30-01 fires — that fact alone confirms the controller, engine board communication, HDD, and imaging section components are all functional. 30-01 is always mechanical, always in the registration-to-second-transfer physical path. Begin with the pre-transfer guide, progress to the STR nip geometry, then PS_T2, then paper media — and the fault will be found in that order on the overwhelming majority of 30-01 calls.