AR-M700 (serv.man28). Self diag message and troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 26

AR-M550/M620/M700  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 26

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Machine tray 4 lift-up 
trouble
MCPED does not turn on 
within the specified time.
MCLUD does not turn on 
within the specified time.
The trouble occurs 3 
times continuously that 
the upper limit sensor 
does not turn on by lift-up 
operation for 10sec when 
inserting a tray or for 2sec 
when printing.
For the first and the 
second times, guide the 
user to pull out the tray in 
case of a tray size error.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

MCPED, MCLUD trouble
No. 4 tray lift-up motor 
trouble
Improper connection of 
the harness of the PCU 
PWB, the lift-up unit, and 
the paper feed unit

Remedy

Check the harness and 
the connector of MCPED 
and MCLUD.
Lift-up trouble unit check

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

38V voltage falls or rises.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Improper connection or 
disconnection of the 
connector and the 
harness

Remedy

Check the connector and 
the harness of the power 
line.

Note 

Case 2

Trouble 
position/
Cause

PCU PWB trouble
Power unit trouble

Remedy

Check 38V power source 
in the power unit and the 
PCU PWB.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

MFP control-FAX 
communication trouble 
(MFP control detection)
The booting sequence by 
the command line 
(9600bps, serial) is not 
completed normally.
Communication 
establishment error/ 
framing/ parity/ protocol 
error

Section

FAX

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Defective connection of 
the slave unit PWB 
connector
Defective harness 
between the slave unit 
PWB and the MFP 
control PWB
Slave unit PWB mother 
board connector pin 
breakage

Remedy

Use SIM 25-2 to perform 
the automatic developing 
adjustment.
Check connection of the 
connector between the 
slave unit PWB and the 
MFP control PWB and 
the harness.

Note 

Check grounding of the 
machine.

Case 2

Trouble 
position/
Cause

Slave unit ROM trouble/ 
no ROM/ Reversed 
insertion of ROM/ ROM 
pin breakage

Remedy

Check the ROM on the 
slave unit PWB.

Note