• Code: 004-338
• Description: Interface PWB Fuse F5 Open Fuse F5 on the Interface PWB is open.
• Remedy: NOTE: No error message will be displayed if Fuse F5 on the Interface PWB opens during the printing process. After power is cycled, the 004-338 error code should be displayed. Fuse F5 on the Interface PWB provides circuit protection through the following P/Js. Verify that there are no short circuits or components that would cause this Fuse to open again if replaced. • P541, pin A8, pin A9, pin B5 • P543, pin 7, pin 9, pin 11

• Code: 004-340
• Description: Controller RAM Fail or Flash ROM Limit Fail Engine Control Board (MCU PWB) RAM test failed or limit of Flash ROM or Flash ROM failed.
• Remedy: 1. Cycle power the printer to clear the error. 2. Did this clear the error? Complete. Replace the Engine Control Board (MCU PWB).

• Code: 004-341
• Description: Controller Logic Fail or Flash ROM Read Write Fail Engine Control Board (MCU PWB) cannot detect INTLK +5 VDC or Flash ROM operation failed.
• Remedy: 1 1. Cycle power to the printer to clear the error. 2. Did the error clear? Complete. Go to step 2. 2 1. Reconnect all the wiring harness connectors for the Engine Control Board and the Image Processor Board. 2. Check the Interlock voltage. 3. Is the voltage +5VDC? Reset NVRAM (refer to Resetting NVRAM). Replace the Engine Control Board (MCU PWB) or the Image Processor Board.

• Code: 004-342
• Description: Flash ROM Limit Fail Limit failure of Flash ROM.
• Remedy: 1 Turn the printer power Off, then On. Does the problem continue? Replace the Engine Control Board (MCU PWB). Return to Service Call Procedures.

• Code: 004-344
• Description: Controller Micro Pitch Fail The micro pitch did not occur within the specified time.
• Remedy: 1 1. Cycle power to the printer to clear the error. 2. Did the error clear? Complete. Replace the following order: 1. Engine Control Board (MCU PWB) 2. Image Processor Board

• Code: 004-345, 004-561
• Description: MCU/HVPS Communication Fail Communication error between the Engine Control Board (MCU PWB) and HVPS Control PWB.
• Remedy: 1 Is there +5 VDC from P/J 574-5 to P/J 574- 4 on the HVPS Control PWB? Go to step 5. Go to step 2. 2 Disconnect P/J 574. Is there +5 VDC from J 574-5 to J 574-4? Go to step 4. Go to step 3. 3 Is there +5 VDC from P/J 411-5 to ground? Check for open circuit or loose connections in the 5 VDC supply wires between P/J411, pins 5 and 6; and P/ J574, pins 5 and 4. Go to +5 VDC Low- Voltage Power Supplies RAP. 4 Check the wire from J411-5 to J574-5 for a short circuit to GND. Is the wire OK? Replace the HVPS Control PWB. Repair the wiring harness. 5 Switch off the power. and check these wires for an open or short circuit to GND: • HVPS Control PWB P/J574-9 to MCU PWB P/J411-1 • HVPS Control PWB P/J574-8 to MCU PWB P/J411-2 • HVPS Control PWB P/J574-7 to MCU PWB P/J411-3 • HVPS Control PWB P/J574-6 to MCU PWB P/J411-4 Is the wiring OK? Replace the Engine Control Board (MCU PWB). If this does not resolve the problem, replace the HVPS Control PWB. Repair the wiring harness.

• Code: 004-346, 004-347
• Description: Accumulator Belt Home Position Fail Too Long or Out of Position The IBT Home Sensor does not detect the Belt Home signal or does not sense the Transfer Belt edge in the correct position. This procedure can be used for troubleshooting Chain Link code 004-346 or 004-347.
• Remedy: 1 Have the Accumulator Belt shipping restrains been completely removed? Go to step 2. Remove the restraints. 2 1. Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Perform the Clear Tech Rep Faults 04-346 procedure. 2. Enter the Adjustments/Calibrations menu and run the Belt Edge Learn Test with the Right-Hand Door open and the Door Interlock held actuated. 3. Does the Accumulator Belt rotate during the test? Go to step 3. Go to step 6. 3 CAUTION Removing the Accumulator Belt Assembly allows light into the Imaging Unit area, avoid exposing the Imaging units to light. 1. Remove the Accumulator Belt Assembly. 2. Is the Belt Home Marker present? Go to step 4. Replace the Accumulator Belt Assembly. 4 1. On the Accumulator Belt Assembly, rotate the Belt Drive Gear in the normal process direction until the Belt Home Marker is positioned beneath the Belt Home Sensor. 2. Reinstall the Belt Assembly. 3. Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Run the Accum MOB Sensor test. 4. Is MOB Sensor is H displayed? Replace in the following order: 1. Engine Control Interface Board 2. Engine Control Board (MCU PWB) Go to step 5. 5 1. Replace the Accumulator Belt Assembly. 2. Retest. 3. Does error 30 return? Troubleshoot and repair using the Reflective Sensor Procedure (). Complete. 6 1. Partially remove the Accumulator Belt Assembly. 2. Manually rotate the Drive Gear clockwise. 3. Does the Belt turn freely? Go to step 14. Go to step 7. 7 1. Inspect the Accumulator Belt Cleaner and Waste Auger for packed toner. 2. Are the Belt Cleaner and Auger clean and free of toner? 3. Do the gears rotate freely? Go to step 9. Go to step 8. 8 1. Using a Type II Toner vacuum, vacuum out the Belt Cleaner and Waste Auger. 2. Is the Actuating Lever broken off of the Belt Cleaner Toner Gate? Replace the Belt Cleaner Assembly. Go to step 9. 9 1. Remove the Waste Toner Cartridge. 2. Enter Service Diagnostics and run the Agitator Motor test. 3. Does the Motor operate correctly? Verify the Waste Toner Cartridge is fully seated. Complete. Go to step 10. 10 1. Check the voltage at J537 on the harness. 2. Is the voltage +24 VDC? Go to step 12. Go to step 11. 11 1. Check the voltage at J537 on the harness. 2. Is the voltage +24 VDC? Replace the Engine Control Board (MCU PWB). Go to step 13. 12 1. Check the voltage at J537 on the harness. Replace the Engine Control Board (MCU PWB) Replace the Waste Toner Agitator Motor. 13 Is +24 VDC present at the Low-Voltage Power Supply Board? Troubleshoot the wiring between the +24 VDC LVPS and the Engine Control Board. Refer to Troubleshooting Low-Voltage Power Supplies procedure (). 14 1. Remove the Accumulator Belt Assembly. 2. Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Run the Accumulator Belt Motor test. 3. Does the Motor run? Diagnose and repair the mechanical condition binding the Accumulator Belt Assembly. Since the Accumulator Belt Drive Motor is a servo motor, there are no voltage checks. This failure can be caused by 1 of 3 components. Replace and test in the following order: 1. Motor 2. Interface Board 3. Engine Control Board (MCU PWB)

• Code: 004-348
• Description: IBT Belt Edge Sensor Fail IBT Belt Edge not detected.
• Remedy: 1 1. Remove the Accumulator Belt Assembly. 2. Inspect the connector for damage. 3. Is the connector damaged? Replace the Accumulator Belt Assembly. Go to step 2. 2 Is the Edge Sensor Actuator touching the Belt? Replace the Accumulator Belt Assembly. Go to step 3. 3 Is the mating connector inside the printer damaged? Repair or replace the wiring harness between the connector and J605 (refer toIBT Belt Assembly ). Go to step 4. 4 1. Reinstall the Accumulator Belt Assembly. 2. Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Run the Belt Edge Sensor test. 3. Is the result OK? Go to step 5. Run the Belt Edge Learn and recheck. If it still fails, go to step 8. 5 1. Switch the printer power On. 2. Remove the Rear Cover. 3. Measure the voltage between the Engine Control Interface Board and J533A+11 (refer to I/F PWB, MAIN Motor, LVPS T11 Plug/Jack Locations ) and Frame ground. 4. Does the voltage measure between +1 to +3 VDC? Go to step 8. Go to step 6. 6 1. Measure the voltage between the Engine Control Interface Board and J533A-9 and Frame ground. 2. Does the voltage measure +5 VDC? Go to step 7. Replace in the following order: 1. Engine Control Interface Board 2. Engine Control Board (MCU PWB) 7 1. Measure the voltage between the Engine Control Interface Board and J533A-10 (refer to I/F PWB, MAIN Motor, LVPS T11 Plug/Jack Locations ) and Frame ground. 2. Does the voltage measure +5 VDC? Replace in the following order: 1. Engine Control Interface Board 2. Engine Control Board (MCU PWB) The Edge Sensor is defective, replace the Accumulator Belt. 8 1. Remove the Accumulator Belt Assembly. 2. Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Run the Steering Motor test. 3. Does the Motor run? Replace the Accumulator Belt Assembly. If the problem is unresolved, replace the Engine Control Board (MCU PWB). Go to step 9. 9 1. Measure the voltage between the Engine Control Interface Board J551-5 (refer to I/F PWB, MAIN Motor, LVPS T11 Plug/Jack Locations ) and Frame ground. 2. Is the voltage +24 VDC? Go to step 10. Replace the following order: 1. Engine Control Interface Board 2. Engine Control Board (MCU PWB) 10 1. Measure the voltage between the Engine Control Board J551 Pins 1, 2, 3, 4, 5 and Frame ground. 2. Is the voltage +24 VDC? Replace in the following order: 1. Engine Control Interface Board 2. Engine Control Board (MCU PWB) Replace the Steering Drive Assembly.