MX-5500N, MX-6200N, MX-7000N (serv.man47). Self diagnostics Trouble Codes - Sharp Copying Equipment Service Manual (repair manual). Page 29

MX-7000N  SELF DIAG AND TROUBLE CODE  8 – 29

 

 

 

 

 

 

 

 

 

 

Trouble content

When the ozone fan 3 is operated, the fan 
operation signal is not detected within the specified 
time.

Section

PCU

Case 1

Cause

Fan connector disconnection

Check and 
remedy

Check the harness and the connector between the 
PCU PWB and the fan.

Case 2

Cause

Fan does not rotate because of other trouble.

Check and 
remedy

Use SIM6-2 to check that the fan is actually 
rotating.

Trouble content

When the paper exit cooling fan center is operated, 
the fan operation signal is not detected within the 
specified time.

Section

PCU

Case 1

Cause

Fan connector disconnection

Check and 
remedy

Check the harness and the connector between the 
PCU PWB and the fan.

Case 2

Cause

Fan does not rotate because of other trouble.

Check and 
remedy

Use SIM6-2 to check that the fan is actually 
rotating.

Trouble content

When the power cooling fan 2 is operated, the fan 
operation signal is not detected within the specified 
time.

Section

PCU

Case 1

Cause

Fan connector disconnection

Check and 
remedy

Check the harness and the connector between the 
PCU PWB and the fan.

Case 2

Cause

Fan does not rotate because of other trouble.

Check and 
remedy

Use SIM6-2 to check that the fan is actually 
rotating.

Trouble content

It is judged that the LSU polygon motor lock signal 
is not outputted, and the lock signal is checked 
after 15 sec from starting rotation of the polygon 
motor and it is judged that the polygon motor does 
not rotate properly.

Section

PCU

Case 1

Cause

Disconnection of the LSU connector or the LSU 
inside harness, or breakage

Check and 
remedy

Check connection of the harness and the 
connector.

Case 2

Cause

Polygon motor trouble, LSU PWB trouble

Check and 
remedy

Use SIM61-1 to check the operation of the polygon 
motor.
Replace the LSUcnt PWB. Replace the LSU.

Trouble content

No full wave signal is detected.

Section

PCU

Case 1

Cause

Harness trouble

Check and 
remedy

Check connection of the harness and the 
connector.

Case 2

Cause

Power unit trouble

Check and 
remedy

Replace the power unit.

Case 3

Cause

PCU PWB trouble

Check and 
remedy

Replace the PCU PWB.

Trouble content

The full wave signal is judged as frequency 
abnormality. (The detection frequency is judged as 
65Hz or above or 45Hz or less.)

Section

PCU

Case 1

Cause

Harness trouble

Check and 
remedy

Check the harness and the connector connection.

Case 2

Cause

Power unit trouble

Check and 
remedy

Replace the power unit.

Case 3

Cause

PCU PWB trouble

Check and 
remedy

Replace the PCU PWB.

Trouble content

Communication establishment error/Framing/
Parity/Protocol error

Section

MFP

Case 1

Cause

Connector connection trouble between the mother 
board PWB and the MFPcnt PWB.
MFPcnt PWB mother board connector pin 
breakage

Check and 
remedy

Check the connector connection between the 
mother board PWB and the MFPcnt PWB. Check 
grounding of the machine.

Case 2

Cause

Mother PWB trouble

Check and 
remedy

Replace the mother PWB.

Case 3

Cause

Mother PWB jumper error

Check and 
remedy

Set the mother PWB jumper to the Default side.

Trouble content

The personal counter is not installed.

Section

MFP

Case 1

Cause

The personal counter is not installed.

Check and 
remedy

Install the personal counter.

Trouble content

Backup SRAM battery voltage fall

Section

MFP

Case 1

Cause

1)

Battery life

2)

Battery circuit abnormality

Check and 
remedy

Check that the battery voltage is about 2.5V or 
above.

Trouble content

EEPROM device read/write error

Section

MFP

Case 1

Cause

EEPROM device trouble

Check and 
remedy

Replace the EEPROM device.

Case 2

Cause

EEPROM device contact failure

Check and 
remedy

Check that EEPROM device is properly inserted.

Case 3

Cause

Device access error due to electrical noises

Check and 
remedy

Replace the MFPcnt PWB.