MX-6201N, MX-7001N (serv.man20). SELF DIAGNOSIS TROUBLE CODES SECTION - Sharp Copying Equipment Service Manual (repair manual). Page 17

MX-7001N  SELF DIAG AND TROUBLE CODE  8 – 17

 

 

 

 

 

 

 

 

Trouble content

Communication error between the finisher and the 
inserter

Section

PCU

Case 1

Cause

Malfunction due to electrical noises.

Check and 
remedy

Turn ON/OFF the power to cancel the error.

Case 2

Cause

Connection trouble or disconnection of the 
connector and the harness between the finisher 
and the inserter. Finisher control PWB trouble, 
inserter control PWB trouble

Check and 
remedy

Check the connector and the harness in the 
communication line. Replace the finisher control 
PWB. Replace the inserter control PWB.

Trouble content

EEPROM trouble

Section

PCU

Case 1

Cause

EEPROM trouble, finisher control PWB trouble, 
inserter control PWB trouble

Check and 
remedy

Replace the finisher control PWB. 
Replace the inserter control PWB.

Trouble content

Sensor adjustment failure

Section

PCU

Case 1

Cause

Sensor trouble, harness disconnection, finisher 
control PWB trouble, inserter control PWB trouble

Check and 
remedy

Use SIM3-2 to check the operation of the inlet port 
cover open/close sensor and the paper exit cover 
open/close sensor.
Replace the finisher control PWB.
Replace the inserter control PWB.

Trouble content

Toner end with the remaining quantity of 25% or 
more.
The toner supply time exceeds 5 times as much as 
the specified time.

Section

PCU

Case 1

Cause

Toner motor section connector harness trouble

Check and 
remedy

Check the connector connection of the toner motor 
section.
Check the connector harness (TM) connection to 
the main PWB.

Case 2

Cause

Toner motor and toner density sensor trouble.
Piezoelectric sensor abnormality

Check and 
remedy

1)

Check the toner density sensor output. 
(SIM25-1)

2)

Check that the toner transport pipe is not 
clogged between the toner cartridge and the 
developing unit. Replace the toner cartridge 
(CRUM) if necessary. Intermediate hopper 
replacement

3)

If replacement of the toner cartridge (CRUM) 
does not clear the trouble, check the 
developing unit.

Trouble content

Improper data are detected in the CRUM contents 
when the normal CRUM of the cartridge is 
detected.

Section

PCU

Case 1

Cause

An improper cartridge is inserted.
Toner cartridge trouble

Check and 
remedy

Replace the toner cartridge.

Trouble content

CRUM cannot be read or written.

Section

PCU

Case 1

Cause

Connection trouble or disconnection of the 
connector and the harness between the PCU and 
the toner cartridge.

Check and 
remedy

Check the connector and the harness between the 
PCU and the toner cartridge.

Case 2

Cause

CRUM trouble

Check and 
remedy

Replace the toner cartridge.

Case 3

Cause

PCU PWB trouble

Check and 
remedy

Replace the PCU PWB.

Trouble content

Process thermistor open

Section

PCU

Case 1

Cause

Process thermistor harness connection trouble

Check and 
remedy

Check the connection of the harness and 
connector of the process thermistor.

Case 2

Cause

Process thermistor trouble

Check and 
remedy

Check the connection of the harness and 
connector of the process thermistor.

Case 3

Cause

PCU PWB trouble

Check and 
remedy

Check the PCU PWB.

Trouble content

Toner empty sensor output abnormality. Sample 
level 25 or less or 231 or above.

Section

PCU

Case 1

Cause

The connector is not installed.

Check and 
remedy

Check the connection of the connector harness to 
the PCU PWB. Check the connection of the toner 
empty sensor. 

Case 2

Cause

Connector harness trouble

Check and 
remedy

Check the harness disconnection.

Case 3

Cause

Cartridge trouble

Check and 
remedy

Check the cartridge connection.