MX-6201N, MX-7001N (serv.man20). SELF DIAGNOSIS TROUBLE CODES SECTION - Sharp Copying Equipment Service Manual (repair manual). Page 32

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MX-7001N  SELF DIAG AND TROUBLE CODE  8 – 32
 
U2-91
Adjustment value check sum error 
(PCU detection)
 
U5-00
SPF communication trouble
 
U5-16
SPF fan motor trouble
 
U5-30
SPF tray lift-up trouble
 
U5-31
SPF tray lift-down trouble
 
U6-09
LCC lift motor trouble
 
U6-20
LCC communication trouble
 
U6-21
LCC transport motor trouble
 
U6-22
LCC 24V power abnormality
 
U6-23
LCC tray descending trouble 
(reverse winding detection)
Trouble content
EEPROM (PCU) check sum error
Section
PCU
Case 1
Cause
Control circuit hang-up due to electrical noises
Check and 
remedy
Use SIM16 to cancel the trouble.
Case 2
Cause
EEPROM trouble.
Check and 
remedy
Check that EEPROM is properly set.
Use SIM16 to cancel the trouble.
Case 3
Cause
PCU PWB EEPROM access circuit trouble
Check and 
remedy
To avoid deletion of the counter data/adjustment 
values, use the simulation to save the counter/
adjustment values. (If there is a printer option, 
execute SIM22-1 to save the counter data and the 
adjustment values.) Replace the PCU PWB.
Use SIM16 to cancel the trouble.
Trouble content
Communication error between the SCU and the 
DSPF, communication line test error after turning 
on the power or canceling the exclusive simulation
Section
SCU
Case 1
Cause
Malfunction due to electrical noises
Check and 
remedy
Cancel the trouble by turning OFF/ON.
Case 2
Cause
Connector and harness connection trouble or 
disconnection
Check and 
remedy
Check the connector and the harness of the 
communication line.
Case 3
Cause
Control (SCU) PWB trouble. DSPF PWB trouble
Check and 
remedy
Replace the control (SCU) PWB. Replace the 
DSPF PWB.
Trouble content
The motor lock signal is detected during rotation of 
the fan.
Section
SCU
Case 1
Cause
Fan motor trouble, harness of the fan motor 
related, circuit trouble
Check and 
remedy
Use SIM2-3 to check the operation.
Check harness, connector and fan motor related 
circuit.
Trouble content
Lift-up trouble is detected 5 times continuously. 
(STUD does not turn ON within the specified time.)
When re-lifting, a trouble from the first time.
Section
SCU
Case 1
Cause
STUD/STLD trouble
Check and 
remedy
Check STUD/STLD and its harness and connector. 
Check the lift-up unit.
Trouble content
Lift-down trouble (STLD does not turn ON within 
the specified time.)
Section
SCU
Case 1
Cause
STUD/STLD trouble
Check and 
remedy
Check STUD/STLD and its harness and connector. 
Check the lift-up unit.
Trouble content
• The encoder input value is not changed in 
0.2sec (1st time)/0.5sec (2nd time and later) 
after rotation of the motor.
• The motor is rotated for 24sec (LCX2)/48sec 
(LCX3) or more.
Section
PCU
Case 1
Cause
Sensor trouble, LCC control PWB trouble, gear 
breakage, lift motor trouble
Check and 
remedy
Use SIM4-2 and 4-3 to check the operation of the 
sensor and the lift motor. Use SIM15 to cancel the 
trouble.
Trouble content
LCC communication error. Communication line test 
error after turning ON the power or canceling the 
exclusive simulation. LCC and machine model 
codes discrepancy error
Section
PCU
Case 1
Cause
Connector and harness connection trouble or 
disconnection, LCC control PWB trouble, control 
(PCU) PWB trouble, malfunction due to electrical 
noises
Check and 
remedy
Turn OFF/ON the power to cancel the trouble. 
Check the connector and the harness of the 
communication line.
Trouble content
After passing 1 sec from turning ON the motor, the 
lock state of the motor lock signal is detected 
continuously for 1 sec.
Section
PCU
Case 1
Cause
Motor lock, motor RPM abnormality, an 
overcurrent to the motor, LCC control PWB trouble
Check and 
remedy
Use SIM4-3 to check the operation of the transport 
motor.
Trouble content
DC24V power is not supplied to LCC.
Section
PCU
Case 1
Cause
Connector and harness connection trouble or 
disconnection, LCC control PWB trouble, power 
unit trouble
Check and 
remedy
Check the connector and the harness of the power 
line. Check that the power unit and the LCC control 
PWB is of 24V.
Trouble content
Reverse winding of the LCC tray wire is detected.
Section
PCU
Case 1
Cause
Reverse winding of the wire
Check and 
remedy
Check the wire.
Case 2
Cause
Connector and harness connection trouble
Check and 
remedy
Check connection of the connector and the 
harness.
Case 3
Cause
Reverse winding detection SW-ON, reverse 
winding detection SW trouble, LCC control PWB 
trouble
Check and 
remedy
Replace the reverse winding SW and the LCC 
control PWB.
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