Read Sharp MX-6240N / MX-7040N (serv.man26) Service Manual online
MX-7040N TROUBLESHOOTING 7 – 46
U2-80
SCU PWB EEPROM read/write error
U2-81
SCU PWB EEPROM check sum error
U2-90
PCU PWB EEPROM read/write error
U2-91
PCU PWB EEPROM check sum error
U5-00
Document feed unit communication
error
U5-16
Document feed unit fan trouble
U5-30
Document feed unit tray lift up trouble
U5-31
Document feed unit tray lift down
trouble
Trouble content
Detail
SCU
Cause
SCU PWB EEPROM trouble
SCU PWB trouble
SCU PWB EEPROM socket connection trouble
SCU PWB trouble
SCU PWB EEPROM socket connection trouble
Check & Remedy
Replace the SCU PWB EEPROM.
Replace the SCU PWB.
Check connection of the SCU PWB EEPROM socket.
Check the SIM adjustment value of the following
items, and adjust again if they are improper.
• Scanner-related adjustments
• Touch panel-related adjustments
Use SIM16 to cancel the trouble.
Replace the SCU PWB.
Check connection of the SCU PWB EEPROM socket.
Check the SIM adjustment value of the following
items, and adjust again if they are improper.
• Scanner-related adjustments
• Touch panel-related adjustments
Use SIM16 to cancel the trouble.
Trouble content
Detail
SCU
Cause
SCU PWB EEPROM trouble.
Installation of non-initialized EEPROM.
SCU PWB trouble.
EEPROM socket contact trouble.
Installation of non-initialized EEPROM.
SCU PWB trouble.
EEPROM socket contact trouble.
Check & Remedy
Replace the SCU PWB EEPROM.
Replace the SCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble. (The check sum
error detection data are calculated again to reset the
proper check sum data.)
Replace the SCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble. (The check sum
error detection data are calculated again to reset the
proper check sum data.)
Trouble content
Detail
PCU
Cause
PCU PWB EEPROM trouble
PCU PWB trouble
EEPROM socket contact trouble
PCU PWB trouble
EEPROM socket contact trouble
Check & Remedy
Replace the PCU PWB EEPROM.
Check the SIM adjustment values of the engine, and
adjust again if they are improper.
Replace the PCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble.
Check the SIM adjustment values of the engine, and
adjust again if they are improper.
Replace the PCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble.
Trouble content
Detail
PCU
Cause
PCU PWB EEPROM trouble
PCU PWB trouble
EEPROM socket contact trouble
PCU PWB trouble
EEPROM socket contact trouble
Check & Remedy
Replace the PCU PWB EEPROM.
Replace the PCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble. (The check sum
error detection data are calculated again to reset the
proper check sum data.)
Replace the PCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble. (The check sum
error detection data are calculated again to reset the
proper check sum data.)
Trouble content
Detail
SCU
Cause
Connector, harness connection trouble.
SCU PWB trouble.
DSPF PWB trouble.
SCU PWB trouble.
DSPF PWB trouble.
Check & Remedy
Turn OFF/ON the power.
Check connection of the connector and the harness.
Replace the SCU PWB.
Replace the DSPF PWB.
Check connection of the connector and the harness.
Replace the SCU PWB.
Replace the DSPF PWB.
Trouble content
Detail
SCU
Cause
When the fan is operated, the fan operation signal is
not detected within the specified time.
Fan motor trouble.
Connector, harness connection trouble.
DSPF PWB trouble.
not detected within the specified time.
Fan motor trouble.
Connector, harness connection trouble.
DSPF PWB trouble.
Check & Remedy
Use SIM2-3 to check that the fan is rotating.
Replace the fan motor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Replace the fan motor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Trouble content
Detail
SCU
Cause
STUD does not turn ON 5 times continuously within
the specified time.
STUD/STLD sensor trouble.
Connection trouble of the connector and the harness.
DSPF PWB trouble.
the specified time.
STUD/STLD sensor trouble.
Connection trouble of the connector and the harness.
DSPF PWB trouble.
Check & Remedy
Replace the STUD/STLD sensor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Trouble content
Detail
SCU
Cause
STLD does not turn OFF within the specified time.
STUD/STLD sensor trouble.
Connection trouble of the connector and the harness.
DSPF PWB trouble.
STUD/STLD sensor trouble.
Connection trouble of the connector and the harness.
DSPF PWB trouble.
Check & Remedy
Replace the STUD/STLD sensor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Check connection of the connector and the harness.
Replace the DSPF PWB.
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