AR-M316 (serv.man10). ARM256 316 Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 102

AR-M256/M257/M258/M316/M317/M318/5625/5631  TROUBLE CODE LIST 9 - 3

E1

80

Content

IMC PWB communication trouble 
(protocol)

Details

Communication trouble between MCU and 
IMC PWB (Protocol error)

Cause

IMC PWB connector disconnection.

Motherboard connector pin breakage.
IMC PWB ROM defect, data failure.

Check 
and 
remedy

Check the connectors of the IMC PWB and 
MCU PWB.

Check the grounding of the copier.
Check the ROM of the IMC PWB.

81

Content

IMC PWB communication trouble (Parity)

Details

Communication trouble between MCU and 
printer IMC (Parity error)

Cause

IMC PWB connector disconnection.
Motherboard connector pin breakage.

IMC PWB ROM defect, data failure.

Check 
and 
remedy

Check the connectors of the IMC PWB and 
MCU PWB.
Check the grounding of the copier.

Check the ROM of the IMC PWB.

82

Content

IMC PWB communication trouble 
(Overrun)

Details

Communication trouble between MCU and 
IMC PWB (Overrun error)

Cause

IMC PWB connector disconnection.

Motherboard connector pin breakage.
IMC PWB ROM defect, data failure.

Check 
and 
remedy

Check the connectors of the IMC PWB and 
MCU PWB.

Check the grounding of the copier.
Check the ROM of the IMC PWB.

84

Content

IMC PWB communication trouble 
(Framing)

Details

Communication trouble between MCU and 
IMC PWB (Framing error)

Cause

IMC PWB connector disconnection.

Motherboard connector pin breakage.

IMC PWB ROM defect, data failure.

Check 
and 
remedy

Check the connectors of the IMC PWB and 
MCU PWB.

Check the grounding of the copier.

Check the ROM of the IMC PWB.

88

Content

IMC PWB communication trouble 
(Time-out)

Details

Communication trouble between MCU and 
IMC PWB (Time-out error)

Cause

IMC PWB connector disconnection.
Motherboard connector pin breakage.

IMC PWB ROM defect, data failure.

Check 
and 
remedy

Check the connectors of the IMC PWB and 
MCU PWB.
Check the grounding of the copier.

Check the ROM of the IMC PWB.

Trouble 

code

Details of trouble

Main 
code

Sub 

code

E7

02

Content

LSU trouble

Details

BD signal from LSU is not detected in a 
constant cycle (Kept OFF or ON)

Cause

LSU connector or LSU inside harness 
trouble or disconnection.

Polygon motor rotation abnormality.
Laser does not illuminate.

MCU PWB failure.

Check 
and 
remedy

Check for disconnection of the LSU 
connector.
Check the LSU operation with SIM 61-1.

Check that the polygon motor rotates 
normally.

Check laser LED lighting.

Replace the LSU unit.
Replace the MCU PWB.

10

Content

CCD black level error

Details

CCD black reference plate scan level 
abnormality when the copy lamp turns off.

Cause

Flat cable installation failure to CCD unit.
CCD unit error.

Check 
and 
remedy

Check flat cable installation to the CCD 
unit.
Check CCD unit.

11

Content

CCD white level error

Details

Improper CCD white reference plate 
reading level for copy lamp lighting

Cause

Flat cable installation failure to CCD unit.
Dirt on the mirror, lens, and reference 
white plate.
Copy lamp lighting trouble.
CCD unit abnormality.
MCU PWB abnormality. (Occurred in the 
RSPF scan position)

Check 
and 
remedy

Clean the mirror, the lens, and the 
reference white plate.
Check the copy lamp light quantity and its 
operation. (SIM 5-3)
Check CCD unit.
Check MCU PWB.

12

Content

Shading trouble

Details

White correction is not completed in the 
specified number of times.

Cause

Flat cable installation failure to CCD unit.
Dirt on the mirror, lens, and reference. 
white plate.

Copy lamp lighting trouble.

CCD unit abnormality.
MCU PWB abnormality.

Check 
and 
remedy

Clean the mirror, the lens, and the 
reference white plate.
Check the copy lamp light quantity and its 
operation. (SIM 5-3)
Check CCD unit.
Check MCU PWB.

Trouble 

code

Details of trouble

Main 
code

Sub 

code