Fax Reception Image Data Error - Sharp MX-C250 Service Manual

E7-22 LSU LD deform error (M)
Cause Reduced laser power, lighting error, laser diode
trouble.
Harness and connector trouble between the LD
PWB and the LSU cnt PWB.
Check & Remedy Use SIM61-1 to check the operation of the LSU.
Check the PWB and connection of the harness in
the LSU.
Replace the LSU.
E7-23 LSU BD(MY) detection error / LSU LD
deform error (K)
Cause Optical axis shift.
Reduced laser power, lighting error, laser diode
trouble.
Harness and connector trouble between the
LD(MY) PWB and the LSU cnt PWB.
Check & Remedy Use SIM61-1 to check the operation of the LSU.
Check the PWB and connection of the harness in
the LSU.
Replace the LSU.
E7-28 LSU-MFP connection error
Cause Communication error between the CPU in the MFP
PWB and the control ASIC.
Improper connection of the communication
connector between the MFP PWB and the LSU cnt
PWB.
Harness trouble between the MFP PWB and the
LSU cnt PWB
MFP PWB or LSU cnt PWB trouble
Check & Remedy Check connection of the connector and the
harness between the MFP PWB and the LSU cnt
PWB.
Replace the LSU PWB.
Replace the MFP PWB.
E7-29 LSU ASIC frequency error
Cause Oscillation abnormality of the external oscillator
and the internal oscillating circuit used in the LSU
ASIC.
LSU ASIC abnormality on the LSUcnt PWB.
Check & Remedy Check connection of the connector and the
harness between the MFP PWB and the LSUcnt
PWB..
Replace the MFP PWB.
Replace the LSU.
E7-38 Zoran chip AD adjustment error
Cause The voltage on MFPC PWB is not stable
The parts on the MFPC PWB are not sol-
dered properly
Check & Remedy Replace the MFPC PWB.
E7-80 Flex RISC- SCU communication error
Cause FlexRISC trouble
Check & Remedy Check fixation of the MFPC PWB
Replace the MFPC PWB.
E7-91
Check & Remedy
E7-93
Check & Remedy
EE-EC
Check & Remedy
EE-EL
Check & Remedy
EE-EU
Check & Remedy
F2-22
Check & Remedy
MX-C250 TROUBLESHOOTING 7 – 7

FAX reception image data error

Cause FAX control PWB trouble
Image data process abnormality
Flash memory contact error
Image compression data corruption
Control PWB trouble
Replace the fax control PWB
Sim60-1 to check the read/write operations of the
memory
Replace the MFPC PWB
Copy, image send, FAX, filing, print
image data process error
Cause Image compression data corruption
Image data process abnormality
Control PWB trouble
Replace the mother board.
Sim60-1 to check the read/write operations of the
memory
Replace the MFPC PWB
Automatic toner density adjustment
error
(Sampling level 76 - 117/139 - 178)
Cause Toner density sensor trouble.
Developing unit trouble.
PCU PWB trouble.
Replace the toner density sensor.
Replace the developing unit.
Replace the PCU PWB.
Automatic toner density adjustment
error (Overtoner)
Cause Toner density sensor trouble.
Charging voltage/ developing voltage trouble, toner
density trouble, or developing unit trouble.
MFPC PWB trouble.
Replace the toner density sensor.
Replace the developing unit.
Replace the MFPC PWB.
Automatic toner density adjustment
error (Undertoner)
Cause Toner density sensor trouble.
Charging voltage/ developing voltage trouble, toner
density trouble, or developing unit trouble.
PCU PWB trouble.
Replace the toner density sensor.
Replace the developing unit.
Replace the MFPC PWB.
Discharge lamp trouble (K)
Cause Contact trouble between the discharge lamp PWB
(K) and the MFPC PWB.
Discharge lamp PWB (K) trouble.
MFPC PWB trouble.
Replace the discharge lamp PWB (K).
Check the harness and the connector.
Replace the MFPC PWB.