Error Code C1195 is a finisher-related error that appears across a wide range of Konica Minolta bizhub colour and mono machines. It indicates that the paper discharge control motor (M2) was commanded to run, but the corresponding sensor (PS2) did not detect the expected mechanical movement within the allowed time window.

This error only occurs when a saddle-stitch finisher unit with a booklet/saddle unit is installed. The exact finisher and sensor name differ slightly between model generations, but the underlying fault — a feedback mismatch between motor command and sensor response — is identical across all affected machines.

This guide covers every affected model and finisher variant, explains what triggers C1195, and provides a complete technician-level troubleshooting procedure from mechanical inspection through board replacement.

All Affected Models and Finisher Variants

C1195 is documented across multiple bizhub families. The finisher and saddle unit installed alongside the machine determines the exact sensor name, connector references, and board designation. Use the table below to identify your combination before starting any troubleshooting.

What Does Error Code C1195 Mean?

C1195 is a motor-sensor feedback mismatch error in the saddle/booklet unit. When the machine processes a booklet or saddle-stitch job, the finisher controller commands Motor M2 to drive the paper discharge control mechanism (or paper receiving guide, depending on finisher type). As M2 operates, the mechanism moves and should trigger Sensor PS2, which confirms to the control board that the movement has occurred.

C1195 fires when PS2 does not change state — either it does not block or does not unblock — within the expected time after M2 is commanded on. This tells the machine that something in the chain between the motor command and the physical sensor response has broken down.

The fault can be anywhere in that chain: a mechanical blockage stopping movement before PS2 is reached, a loose connector corrupting the motor drive or sensor signal, a failed PS2 sensor that no longer responds to physical actuation, a failed M2 motor that receives the command but does not rotate, or a board-level fault in the SDDB/SDCB that cannot correctly drive the motor or read the sensor.

Connector Reference by Finisher Variant

Before starting diagnosis, note your finisher model and use the correct connector references below:

Step-by-Step Troubleshooting Procedure

Work through all steps in order. The majority of C1195 cases are resolved by Steps 1–3 without any component replacement.

Step 1 — Inspect the Curl Cover / Paper Receiving Guide Mechanism for Obstructions

A mechanical obstruction is the most common cause of C1195 and must always be ruled out first. If the mechanism physically cannot move, M2 may run but PS2 will never detect the expected position change.

1. Power the machine fully OFF and unplug the power cord
2. Open the saddle unit (SD-511, SD-512, or integrated saddle section depending on your finisher model)
3. Locate the curl cover mechanism or paper receiving guide — this is the movable flap or guide that M2 drives during the paper discharge cycle
4. Inspect the mechanism thoroughly for: torn paper fragments, accumulated toner or paper dust restricting movement, broken plastic components (cracked pivot arms, snapped linkage rods), bent or misaligned guide plates
5. Manually move the mechanism through its full range of motion by hand — it should travel smoothly from one position to the other with light, even resistance and no binding or catching
6. If you find a paper fragment, remove it completely — use tweezers for small pieces and a flashlight to confirm nothing remains
7. If you find broken plastic components, replace them before proceeding — a mechanism that cannot complete its travel will trigger C1195 on every job regardless of the motor or sensor condition
8. After clearing any obstruction, manually move the mechanism past the PS2 sensor flag position to confirm PS2 actuates correctly (the flag should physically contact and release the sensor)

Step 2 — Inspect and Reseat All Harness Connectors

Loose, oxidized, or partially unseated connectors in the M2 motor path or PS2 sensor path are the second most common cause of C1195 — especially on machines that have been moved, recently serviced, or operating in dusty environments.

1. With the machine powered OFF, trace the complete M2 motor harness from the motor through the relay connectors to the SDDB (or SDCB) board
2. Disconnect and firmly reseat each connector in the path: M2 → Relay CN3 → Relay CN2 → SDDB J5 (adjust connector references per your finisher variant from the table above)
3. Repeat for the PS2 sensor harness: PS2 → Relay CN3 → Relay CN2 → SDDB J5
4. Also check and reseat the inter-unit connector where the harness passes between the finisher main body and the saddle unit — this connector is subject to repeated stress during opening and closing of the saddle unit door and is a common source of intermittent faults
5. Inspect every connector pin for: bent or backed-out pins, green or white oxidation, cracked connector housings, or visible damage to the harness insulation
6. Clean oxidized pins with electrical contact cleaner and a cotton swab — allow to dry completely before reconnecting
7. Power on and run a test booklet job to see if C1195 clears

Step 3 — Verify M2 Motor Drive Coupling

Even with correct wiring, a slipping or disengaged mechanical coupling between M2’s output shaft and the discharge mechanism means the motor spins but no movement reaches the curl cover or guide — so PS2 never detects a position change.

1. With the machine powered OFF, locate the M2 motor and inspect its output coupling or drive gear
2. Check for: a cracked or split coupler hub, stripped drive gear teeth, a coupler that has worked loose from the motor shaft
3. Attempt to manually turn the mechanism from the motor coupling point — if the coupling slips freely without moving the mechanism, the coupling is disengaged or broken
4. Correct any coupling issue before proceeding — replacing M2 with a faulty coupling will produce the same error

Step 4 — Diagnose Sensor PS2 (Curl Cover Detection / Paper Receiving Guide Home Sensor)

If the mechanism moves freely, connectors are seated, and coupling is intact, the next suspect is PS2 itself. A sensor whose photo-interrupter has failed, or whose actuator flag is bent or broken, will never change state regardless of mechanical movement.

1. Enter Service Mode on the bizhub (refer to your model’s service manual for the access procedure)
2. Navigate to the I/O check or sensor check section for the finisher / saddle unit
3. Monitor PS2 at SDDB J5 pin 3 (ON) while manually actuating the sensor flag by hand — moving the flag should cause the signal to switch between ON and OFF states
4. If PS2 does not change state when the flag is physically moved: the sensor has failed internally and must be replaced
5. If PS2 changes state correctly in the I/O check but C1195 still occurs during a print job: the mechanism is not reaching the sensor flag position during actual operation — recheck for subtle mechanical restrictions that only appear under load

Step 5 — Perform Motor M2 Operation Check

If PS2 checks out correctly, verify that M2 is actually receiving and responding to drive commands from the SDDB/SDCB.

1. In Service Mode, navigate to the motor operation check for M2 in the saddle unit section
2. Command M2 to run using the service mode function
3. Observe the motor: it should start immediately, run smoothly, and drive the curl cover or guide mechanism through its full travel
4. Monitor the motor drive signal at SDDB J5 pins 4–7 (or SDCB J5 pins 4–7 for FS-536SD/537SD) — confirm the control board is issuing a valid drive signal
5. If M2 does not respond to the service mode command despite a valid drive signal being present at the connector: the motor has failed internally and must be replaced
6. If no drive signal is present at the connector: the fault is in the SDDB or SDCB board — proceed to Step 7

Step 6 — Replace Motor M2

If Steps 1–5 confirm the mechanical path is clear, connectors are good, PS2 is functional, and the drive signal is present but M2 still does not respond — replace M2.

1. Order the correct replacement M2 motor for your finisher model (FS-534, FS-535, FS-536SD, FS-537SD, FS-539SD, or FS-540SD — the motor part number differs between finisher generations)
2. Power OFF and unplug the machine before starting
3. Note the motor’s mounting orientation and coupling engagement before removing the old motor
4. Disconnect the harness, remove mounting screws, and extract M2
5. Install the replacement motor, confirm the coupling engages fully with the drive mechanism, and reconnect the harness
6. Run a test booklet job to confirm C1195 is resolved and the mechanism moves correctly through its full cycle

Step 7 — Replace the SDDB or SDCB (Sub Discharge Drive Board)

If a confirmed-good M2 motor and a confirmed-good PS2 sensor still produce C1195, the fault lies in the Sub Discharge Drive Board (SDDB) — or the SD Control Board (SDCB) on higher-end finisher models. This board drives M2 and reads PS2. A failed motor driver circuit or sensor input circuit on this board will prevent the system from correctly commanding the motor or interpreting the sensor feedback.

1. Replace the SDDB (for FS-534/SD-511, FS-535/SD-512 configurations) or SDCB (for FS-536SD, FS-537SD configurations) with a genuine Konica Minolta replacement board
2. After installation, rerun the M2 operation check and PS2 I/O check in service mode to confirm both are functioning correctly through the new board
3. Run a test booklet job to confirm C1195 does not return

Step 8 — Replace the Finisher Control Board (FSCB)

FSCB replacement is the last resort. The Finisher Control Board is the master controller for all finisher operations. If C1195 persists after replacing M2 and the SDDB/SDCB with confirmed-good parts, the FSCB may have a failed communication path to the saddle unit board that prevents it from correctly issuing the M2 drive command or receiving the PS2 feedback.

1. Replace the FSCB with a genuine replacement board for your specific finisher model
2. After installation, verify full finisher operation: run staple jobs, booklet jobs, and punch jobs (if applicable) to confirm all finisher functions have been restored
3. FSCB failures that cause C1195 in isolation are rare — if replacing the FSCB also does not resolve the error, recheck all mechanical and wiring elements from Step 1 with fresh eyes before escalating

Quick Reference — Troubleshooting by Symptom

Preventing C1195 From Recurring

• Clean the saddle unit during every PM visit — paper dust and toner accumulation in the curl cover area is the leading cause of mechanical restriction. A 5-minute clean during routine maintenance eliminates most future C1195 events
• Inspect the curl cover / paper receiving guide mechanism for wear — plastic linkage components in the saddle unit are subject to fatigue over high page counts. Replace worn parts proactively rather than waiting for a failure
• Check and reseat the inter-unit connector at every service visit — the connector between the finisher body and saddle unit is opened and closed repeatedly during jam clearance and maintenance, making it prone to intermittent contact over time
• Use correct paper specifications for booklet jobs — oversized, overly thick, or damp paper can resist the curl cover mechanism and cause it to stall, triggering C1195. Always verify paper weight is within the finisher’s rated specification for saddle-stitch jobs
• Verify paper path alignment after any finisher work — if the finisher has been removed and refitted, misalignment of the saddle unit entry path can cause paper to foul the curl cover mechanism on the first booklet job

Professional Technician Summary

Error Code C1195 on Konica Minolta bizhub machines is a paper discharge control motor feedback error in the saddle / booklet unit, and it presents identically whether you are working on a bizhub C224 with an FS-534+SD-511, a bizhub C758 with an FS-537SD, or an i-series machine with an FS-540SD. The sensor name changes between finisher generations — curl cover detection sensor on older units, paper receiving guide home sensor on newer ones — but the detection logic, the component chain, and the troubleshooting sequence are the same across all variants.

In field practice, mechanical obstructions and loose connectors account for the overwhelming majority of C1195 cases. A thorough mechanical inspection of the saddle unit followed by a complete connector reseat resolves most instances without any component replacement. When parts do need to be replaced, M2 motor failure is the next most common cause — SDDB and FSCB failures are uncommon and should only be considered after motor and mechanical causes have been confirmed and ruled out.