AL-2020 (serv.man2). Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 78

AL-2040  SIMULATION, TROUBLE CODES  10 - 18

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 (SIM 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.

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 SIM 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.

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 SIM 14 to clear the self diagnostic 
display.

Main 
code

Sub 

code

Details of trouble

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 SIM 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 SIM 14 to clear the self diagnostic 
display.

H4

00

Content Heat roller low temperature detection

Detail

1) When the target temperature (165°C) is 

not reached in 55 sec after starting 
warming-up.

2) When the temperature below 100°C is 

detected for 300ms under the ready 
print state.

∗ "Starting warming-up" means not only 

that in power supply but also reset that in 
reset from shut-off and in side door 
close. (The timing of generating H4 is not 
limited to that in power supply.)

Cause

Thermistor abnormality
Heater lamp abnormality
Thermostat abnormality
Control PWB abnormality

Check 
and 
remedy

Use SIM 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 SIM 14 to clear the self diagnostic 
display.

Main 
code

Sub 

code

Details of trouble