MX-1800N (serv.man16). Section 8 - Self Diagnostics Trouble Codes - Sharp Copying Equipment Service Manual (repair manual). Page 24

MX-1800N  SELF DIAG AND TROUBLE CODE  8 – 24

 

 

 

 

 

 

 

 

 

Trouble content

EEPROM version error, write error to EEPROM

Section

PCU

Case 1

Cause

EEPROM trouble,  installation of EEPROM which 
is not initialized

Check and 
remedy

Check that EEPROM is properly set.

Case 2

Cause

PCU PWB EEPROM access circuit trouble

Check and 
remedy

To avoid deletion of the counter data/adjustment 
data, 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

Check sum error of adjustment value (PCU)

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.

Case 3

Cause

PCU PWB EEPROM access circuit trouble

Check and 
remedy

To avoid deletion of the counter data/adjustment 
data, 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.

Trouble content

Desk communication error, communication line 
test error after turning on the power or canceling 
the exclusive simulation

Section

PCU

Case 1

Cause

Connector and harness connection trouble or 
disconnection, desk control PWB trouble, control 
PWB (PCU) trouble, malfunction due to electrical 
noises

Check and 
remedy

Cancel the trouble by turning OFF/ON. Check the 
connector and the harness of the communication 
line.

Trouble content

DLUD1 does not turn ON within the specified time.

Section

PCU

Case 1

Cause

DLUD1 sensor trouble, tray 1 lift-up motor trouble, 
desk PWB, lift-up unit, paper feed unit harness 
connection trouble

Check and 
remedy

Check DLUD1 and its harness and connector. 
Check the lift-up unit.

Trouble content

DLUD2 does not turn ON within the specified time.

Section

PCU

Case 1

Cause

DLUD2 sensor trouble, tray 2 lift-up motor trouble, 
desk PWB, lift-up unit, paper feed unit harness 
connection trouble

Check and 
remedy

Check DLUD2 and its harness and connector. 
Check the lift-up unit.

Trouble content

Desk transport motor operation trouble

Section

PCU

Case 1

Cause

Motor lock, motor RPM abnormality, overcurent to 
the motor, console finisher control PWB trouble

Check and 
remedy

Use SIM 4-3 to check the operation of the desk 
transport motor.

Trouble content

Detection of desk connection incompatible with the 
MX-1800

Section

PCU

Case 1

Cause

Connection of a desk which is incompatible with 
the MX-1800 is detected.

Check and 
remedy

Connect the MX-DEX1/DEX2.

Trouble content

CPT-ASIC access error (When the ASIC does not 
operate normally.)

Section

Scanner

Case 1

Cause

CPT-ASIC abnormality, SCU PWB abnormality

Check and 
remedy

Turn OFF/ON the power several times. If the 
trouble still occurs, replace the SCU PWB or the 
CPT-ASIC.

Trouble content

Communication error between SCU and DOCC
Communication line test error when turning on the 
power or after canceling an exclusion simulation.

Section

Scanner

Case 1

Cause

Connector or harness connection error or 
disconnection

Check and 
remedy

Check the connector and harness in the 
communication line.

Case 2

Cause

Control PWB (SCU) trouble, DOCC PWB trouble.

Check and 
remedy

Replace the SCU PWB or the DOCC PWB.

Case 3

Cause

Malfunction due to electrical noises.

Check and 
remedy

Turn OFF/ON the power to electrical cancel the 
trouble.