AL-840 (serv.man9). AL800 840 Service Manual-Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 5

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SELF DIAG CODE MESSAGE
E7
No
C3
PHENOMENON
DISPLAY
CODE
MAIN CODE
E7
SUB CODE
03
LAMP
TITLE
Laser beam output trouble
DETAIL
1) Laser beams are not outputted.
2) Laser beams are not recognized.
SECTION
Scanner (writing)
ITEM
TYPE (MODE)
User
Warning
Service
YES
Trouble
YES
Other
Other
OPERATION MODE
All modes
Machine operation when the
message is displayed
Stop
NOTE
BASIC CAUSE 1
When the scanner (writing) motor is rotating, the laser beam detection signal (SYNC) is not recognized.
CASE 1
No
TROUBLE POSITION
CAUSE
Laser beam sensor signal recognition error
1) Laser beam sensor trouble
2) MCU PWB laser beam sensor input circuit trouble
REMEDY
(Check)
1) Laser beam sensor
2) MCU PWB laser beam sensor input circuit
(Remedy)
1) Laser beam sensor replacement
2) The MCU PWB replacement
(After work)
1) When the MCU PWB is replaced, perform simulations to input various set values and
adjustment values.
NOTE
CASE 2
No
TROUBLE POSITION
CAUSE
The scanner (writing) optical system does not reflect and converge laser beams normally.
1) Scanner (writing) optical system dirt
2) Scanner (writing) optical system parts installation position shift
REMEDY
(Check)
1) Scanner (writing) optical system dirt
2) Scanner (writing) optical system parts installing position shift
(Remedy)
1) Scanner (writing) optical system cleaning
2) Scanner (writing) optical system cleaning
(After work)
NOTE
SELF DIAG CODE MESSAGE
E7
No
C4
PHENOMENON
DISPLAY
CODE
MAIN CODE
E7
SUB CODE
04
LAMP
TITLE
Shading correction (white level) trouble
DETAIL
1) Abnormal white level output during shading correction 
2) The white level output is not recognized properly during shading correction.
SECTION
Scanner (reading)
ITEM
TYPE (MODE)
User
Warning
Service
YES
Trouble
YES
Other
Other
OPERATION MODE
Copy
Message display
Stop
NOTE
BASIC CAUSE 1
The white level output is not recognized properly during shading correction.
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