Sharp MX-2314N Service Manual page 266

E7-20 LSU laser detection error (K)
Trouble content
Detail PCU
Cause Laser optical axis misalignment
Reduced laser power, lighting error, laser diode
trouble.
LSU harness, connector trouble
LSU trouble
Check & Remedy Use SIM61-1 to check the operation of the LSU.
Check or replace the LSU control PWB.
Check connection of the LSU harness.
Replace the LSU.
E7-21 LSU laser detection error (C)
Trouble content
Detail PCU
Cause Laser optical axis misalignment
Reduced laser power, lighting error, laser diode
trouble.
LSU harness, connector trouble
LSU trouble
Check & Remedy Use SIM61-1 to check the operation of the LSU.
Check or replace the LSU control PWB.
Check connection of the LSU harness.
Replace the LSU.
E7-22 LSU laser detection error (M)
Trouble content
Detail PCU
Cause Laser optical axis misalignment
Reduced laser power, lighting error, laser diode
trouble.
LSU harness, connector trouble
LSU trouble
Check & Remedy Use SIM61-1 to check the operation of the LSU.
Check or replace the LSU control PWB.
Check connection of the LSU harness.
Replace the LSU.
E7-23 LSU laser detection error (Y)
Trouble content
Detail PCU
Cause Laser optical axis misalignment
Reduced laser power, lighting error, laser diode
trouble.
LSU harness, connector trouble
LSU trouble
Check & Remedy Use SIM61-1 to check the operation of the LSU.
Check or replace the LSU control PWB.
Check connection of the LSU harness.
Replace the LSU.
E7-28
Trouble content
Check & Remedy
E7-29
Trouble content
Check & Remedy
E7-49
Trouble content
Check & Remedy
E7-50
Trouble content
Check & Remedy
E7-55
Trouble content
Check & Remedy
MX3114N TROUBLESHOOTING 7 – 11
LSU - PCU connection error
Detail PCU
Cause Communication error between the CPU in the PCU
PWB and the LSU control ASIC.
Improper connection of the communication connector
between the PCU PWB and the LSU control PWB
(interface PWB).
Harness trouble between the PCU PWB and the LSU
control PWB (interface PWB)
PCU PWB trouble.
LSU control PWB trouble.
LSU trouble.
LSU mother PWB trouble.
Check connection of the connector and the harness
between the PCU PWB and the LSU control PWB
(interface PWB).
Replace the LSU mother PWB.
Replace the PCU PWB.
Replace the LSU.
Replace the LSU control PWB.
LSU ASIC frequency error
Detail PCU
Cause Oscillation abnormality of the external oscillator and
the internal oscillating circuit used in the LSU ASIC.
LSU ASIC abnormality on the LSU ASIC PWB.
Replace the LSU control PWB.
Water Mark data error
Detail MFP
Cause Watermark data trouble.
HDD trouble.
Use SIM49-5 to upload the watermark data.
Replace the HDD.
Combination error between PWB and
firmware (PCU PWB detection)
Detail PCU
Cause A PWB/firmware/LSU which is not compatible with
the machine specifications is detected.
PCU PWB trouble
LSU trouble
Check the kind and the version of the firmware.
Check or replace the LSU.
Check or replace the PCU PWB.
PCU PWB information sum error
PCU EEPROM PWB information sum error
Detail PCU
Cause PCU EEPROM sum check error.
PCU EEPROM trouble.
PCU EEPROM contact trouble.
Replace the PCU PWB.
Replace the PCU EEPROM.