AR-M550 (serv.man16). (9) Self diag message and troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 38

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 38

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Memory check sum error 
(PCU)
When POF data/counter 
data sum error is 
detected.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

EEPROM trouble

Remedy

Check that the EEPROM 
is properly installed.
In the simulation to 
prevent against delete of 
the counter data/
adjustment values, write 
down the counter/
adjustment values.

Note 

Case 2

Trouble 
position/
Cause

Control circuit runaway 
due to noises

Remedy

Use SIM 16 to cancel the 
U2 trouble.

Note 

Case 3

Trouble 
position/
Cause

PCU PWB EEPROM 
access circuit trouble

Remedy

Replace the PCU PWB.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

SPF tray lift-up trouble
Lift-up trouble is detected 
5 times continuously.

Section

Scanner

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

STUD/STLD trouble
STUD does not turn on 
within the specified time.
STLD does not turn off 
within the specified time.

Remedy

Check the harness and 
the connector of the 
STUD and STLD.
Lift-up trouble unit check

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

SPF tray lift-down trouble
STLD does not turn off 
within the specified time.

Section

Scanner

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

STUD/STLD trouble
STUD does not turn on 
within the specified time.
STLD does not turn off 
within the specified time.

Remedy

Check the harness and 
the connector of the 
STUD and STLD.
Lift-up trouble unit check

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

LCC lift motor trouble
• The upper limit sensor 

does not turn on within 
24 sec after the lift 
motor is on.

• No rotation sensor 

signal is detected for 
0.2 sec or longer while 
the lift motor is on.

• The upper limit switch 

is on while the lift motor 
is on.

When the trouble occurs 
3 time continuously that 
the upper limit sensor 
does not turn on.

Section

LCC

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Sensor trouble
LCC control PWB trouble
Gear breakage
Lift motor trouble

Remedy

Use SIM to check the 
sensor detection.
Use SIM to check the lift 
motor operation.
Use SIM 15 to cancel the 
trouble.

Note