AR-M155 (serv.man3). Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 106

AR-M150/M155/M155X  TEST COMMAND, TROUBLE CODES  10 - 40

E7

11

Content Shading trouble (White correction)
Detail

The CCD white scan level is abnormal when the 
shading.

Cause

Improper connection of the CCD unit flat cable
Dirt on the mirror, the lens, and the reference 
white plate
Copy lamp lighting abnormality
CCD unit abnormality
MCU PWB abnormality
(When occurred in the SPF scan position.)
Improper installation of the mirror unit

Check 
and 
remedy

Clean the mirror, lens, and the reference white 
plate.
Check the light quantity and lighting status of 
the copy lamp (TC 05-03).
Check the MCU PWB.

16

Content Abnormal laser output
Detail

When the laser output is stopped, HSYNC is 
detected.

Cause

Laser abnormality
MCU PWB abnormality.

Check 
and 
remedy

Check the laser emitting diode operation.
Replace the MCU PWB.

F2

04

Content Improper cartridge (Destination error, life cycle 

error)

Detail

The destination of the main unit differs from that 
of the CRUM.
The life cycle information is other than "FFh" 
(Not used).

Cause

CRUM chip trouble
Improper developing unit

Check 
and 
remedy

Replace the CRUM chip.
Replace the developing unit.

F5

02

Content Copy lamp lighting abnormality
Detail

The copy lamp does not turn on.

Cause

Copy lamp abnormality
Copy lamp harness abnormality
CCD PWB harness abnormality.

Check 
and 
remedy

Use TC 5-3 to check the copy lamp operations.
When the copy lamp lights up.
Check the harness and the connector between 
the CCD unit and the MCU PWB.
When the copy lamp does not light up.
Check the harness and the connector between 
the copy lamp unit and the MCU PWB.
Replace the copy lamp unit.
Replace the MCU PWB.

F6

10

Content FAX board trouble
Detail

Communication trouble between MCU and FAX 
control PWB

Cause

FAX control PWB connector disconnection
Defective harness between FAX control PWB 
and MCU PWB
Motherboard connector pin breakage
FAX control PWB ROM error/Data error
IC on FAX PWB causes abnormality

Check 
and 
remedy

Check connector/harness of FAX control PWB 
and MCU PWB.
Check the grounding of the copier.
Check FAX control PWB ROM.
Replace the FAX PWB.

Main 
code

Sub 

code

Details of trouble

H2

00

Content Thermistor open
Detail

The thermistor is open.
The fusing unit is not installed.

Cause

Thermistor abnormality
Control PWB abnormality
Fusing section connector disconnection
The fusing unit is not installed.

Check 
and 
remedy

Check the harness and the connector between 
the thermistor and the PWB.
Use TC 14 to clear the self diagnostic display.

H3

00

Content Heat roller high temperature detection

Detail

The fusing temperature exceeds 240°C.

Cause

Thermistor abnormality
Control PWB abnormality
Fusing section connector disconnection.

Check 
and 
remedy

Use TC 5-02 to check the heater lamp blinking 
operation.
When the lamp blinks normally.
Check the thermistor and its harness.
Check the thermistor input circuit on the control 
PWB.
When the lamp keeps ON.
Check the power PWB and the lamp control 
circuit on the MCU PWB.
Use TC 14 to clear the self diagnostic display.

H4

00

Content Heat roller low temperature detection

Detail

The fusing temperature does not reach 185°C 
within 27 sec of turning on the power, or the 
fusing temperature keeps at 140°C.

Cause

Thermistor abnormality
Heater lamp abnormality
Thermostat abnormality
Control PWB abnormality

Check 
and 
remedy

Use TC 5-02 to check the heater lamp blinking 
operation.
When the lamp blinks normally.
Check the thermistor and its harness.
Check the thermistor input circuit on the control 
PWB.
When the lamp does not light up.
Check for disconnection of the heater lamp and 
the thermostat. Check the interlock switch.
Check the power PWB and the lamp control 
circuit on the MCU PWB.
Use TC 14 to clear the self diagnostic display.

Main 
code

Sub 

code

Details of trouble