Archive December 14, 2025 by rawaha

Troubleshooting Konica Minolta bizhub C454 Jam Code 11-01

If your Konica Minolta bizhub C454 displays a Jam Code 11-01, you are dealing with a fundamental paper feed failure from the main paper tray (Tray 1). This error signifies a physical delay: the machine started to feed a sheet, but the paper’s leading edge did not reach and block the registration sensor within the expected timeframe. Unlike purely electronic jams, this code points to a mechanical transport problem or a complete failure to pick up paper. This guide provides the systematic procedure technicians use to resolve this path obstruction or feed failure.

Understanding Jam Code 11-01

  • Jam Type: Misfeed at the Tray 1 feed section due to paper arrival delay.
  • Technical Definition: The leading edge of the paper does not unblock the registration sensor (PS1) even after the lapse of a given period of time after Tray 1 starts to feed paper. The machine is waiting for a “paper present” signal that never comes.
  • Key Insight: This code can be falsely triggered if the Tray 1 paper feed sensor (PS23) is already in the “ON” (paper detected) position during machine initialization (after power-up, door closure, or jam reset). This makes PS23 a critical first check.
  • Common User Experience: You may hear the machine attempt to feed from Tray 1, but no paper emerges into the paper path. Alternatively, a sheet may be partially picked up but stall immediately, failing to travel toward the registration rollers.

Relevant Parts & Systems

The fault lies in the components responsible for picking the paper from Tray 1 and moving it to the registration point.

  • Tray 1 Paper Feed Sensor (PS23): Detects if paper is present in the tray’s feed-ready position. If stuck ON, it can falsely trigger a jam on reset.
  • Registration Sensor (PS1): The critical endpoint for this timing check. A dirty, stuck, or faulty sensor will not signal paper arrival, causing this jam.
  • Tray 1 Paper Feed Clutch (CL3): Engages to initiate the pick-up and feed cycle from Tray 1. A failed clutch means no feed motion occurs.
  • Paper Feed Motor (M22): Provides the driving force for the entire paper feed system. If it fails, no paper moves from any tray.
  • Registration Motor (M24): While not the primary suspect for initial feed, its timing is linked to the overall sequence.
  • Control Boards (FRB, EXCB, PRCB): The PRCB sends the command to CL3. The EXCB drives M22 and M24. The FRB interfaces with PS1. A fault on any board can disrupt the feed command or sensor feedback.

Step-by-Step Troubleshooting Procedure

⚠️ Safety First: Always turn OFF and unplug the copier before performing any internal inspection, testing, or part replacement.

Step 1: The Initial Check & Physical Inspection

Start with the most obvious physical causes.

  1. Clear & Inspect: Open the right door and remove Tray 1. Clear any paper fragments or debris from the entire Tray 1 feed path, including the separation pad area and the path leading to the registration sensor.
  2. Check Paper & Tray: Ensure you are using correct, specified paper that is not curled, damp, or overloaded. Verify the paper side guides in Tray 1 are snug against the paper stack.
  3. Inspect Rollers: Visually check the Tray 1 pick-up roller and separation pad for wear, glossiness, or damage. A worn roller cannot grip paper effectively.

Step 2: Check the Tray 1 Paper Feed Sensor (PS23)

A sensor stuck in the “paper present” state is a common culprit.

  1. With Tray 1 removed, locate the PS23 sensor (typically inside the machine where the tray sits).
  2. Manually actuate its lever/flag with your finger. It should move freely and spring back. Clean any obstructing debris.
  3. For an electrical check, locate its signal at PRCB CN26-10. Use a multimeter to check for a clean voltage change when actuating the sensor. If the state is permanently ON or doesn’t change, replace PS23.

Step 3: Check the Registration Sensor (PS1)

If paper is feeding but not being detected, PS1 is the next target.

  1. Locate the Registration Sensor (PS1) assembly along the paper path after the trays.
  2. Manually move its actuator flag. Ensure it moves freely and isn’t gummed up with toner or paper dust.
  3. Check its I/O signal at FRB CN8-3. The voltage should change cleanly when the flag is moved. A poor signal indicates a failed sensor that must be replaced.

Step 4: Check the Tray 1 Feed Clutch (CL3) Operation

If no feed motion is heard, the clutch is suspect.

  1. Listen carefully when initiating a print from Tray 1. You should hear a distinct “click” or engagement sound from the CL3 clutch.
  2. To verify electrically, check the control signal at PRCB CN26-8. If the signal is present but no mechanical action occurs, the clutch (CL3) is faulty and needs replacement.

Step 5: Check Motor Operations (M22, M24)

Motors provide the essential movement. A failing motor can cause slow or no paper movement.

  1. Paper Feed Motor (M22): This motor drives the feed rollers. Check its control signals at EXCB CN3, pins 5-8. Listen for smooth, consistent operation. A struggling motor will cause feed delays.
  2. Registration Motor (M24): Check its control signals at EXCB CN3, pins 1-4. While less directly linked to the initial 11-01 fault, its timing is part of the overall sequence and should be verified.

Step 6: Advanced Control Board Diagnostics

If all sensors and actuators test correctly, the issue is in command or signal processing.

  1. Replace the Front Side Board (FRB): As the interface for the critical PS1 sensor, a faulty FRB can corrupt the “paper arrived” signal, causing this jam. This is a logical next step.
  2. Expansion Control Board (EXCB) Check: This board drives the motors. Perform a conduction check on the motor driver chips IC4 and IC5. If these are damaged, motor speed and timing can be off, causing the paper to arrive late at PS1. Replacement of the EXCB may be required.
  3. Printer Control Board (PRCB) Check: The main controller. It commands CL3 to engage and starts the timing window for PS1. Check the conduction of ICP5. If the PRCB is not issuing the correct commands, replacement is the final repair step.

Pro Tips for Prevention

  • Regular Maintenance: Periodically clean the Tray 1 pick-up roller, separation pad, and feed rollers. Replace them when worn or hardened.
  • Sensor Health: Include both PS23 and PS1 in your routine sensor cleaning schedule to prevent false readings.
  • Paper Quality: Use good quality, dry paper and fan it before loading to prevent sticking or multi-feeds that can cause feed stalls.
  • Tray Loading: Do not overfill Tray 1. Ensure the paper stack is below the maximum fill line and the side guides are correctly adjusted.

When to Call a Professional

Jam Code 11-01 is often resolved by cleaning or replacing the Tray 1 pick-up roller, separation pad, or the PS23/PS1 sensors. However, if the problem points to a failed clutch, motor, or control board (FRB, EXCB, PRCB), the repair requires technical expertise and proper parts. If you have performed the basic mechanical and electrical checks without success, it is time to contact a certified Konica Minolta technician. They have the tools and parts to efficiently diagnose and replace the faulty component, restoring reliable paper feed from Tray 1.