Read Sharp AL-840 (serv.man9) Service Manual online
No
C6
BASIC CAUSE 1
1) CCD level output recognition error during shading correction
2) Abnormally low or high CCD output level
2) Abnormally low or high CCD output level
CASE 1
No
TROUBLE POSITION
CAUSE
CAUSE
Scanner (reading) optical system does not transmit images (light) normally
1) Scanner (reading) optical system dirt
2) Scanner (reading) optical parts installing position shift
1) Scanner (reading) optical system dirt
2) Scanner (reading) optical parts installing position shift
REMEDY
(Check)
1) Scanner (reading) optical system dirt
2) Scanner (reading) optical parts installing position adjustment
(CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet)
1) Scanner (reading) optical system dirt
2) Scanner (reading) optical parts installing position adjustment
(CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet)
(Remedy)
1) Scanner (reading) optical system cleaning
2) Scanner (reading) optical parts installing position adjustment
(CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet)
1) Scanner (reading) optical system cleaning
2) Scanner (reading) optical parts installing position adjustment
(CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet)
(After work)
1) Copy density adjustment
1) Copy density adjustment
NOTE
CASE 2
No
TROUBLE POSITION
CAUSE
CAUSE
CCD level output recognition error during shading correction
1) CCD unit trouble
2) MCU PWB image signal (CCD) input circuit trouble
1) CCD unit trouble
2) MCU PWB image signal (CCD) input circuit trouble
REMEDY
(Check)
1) CCD unit output
2) MCU PWB image signal (CCD) input circuit
1) CCD unit output
2) MCU PWB image signal (CCD) input circuit
(Remedy)
1) CCD unit replacement
2) MCU PWB replacement
1) CCD unit replacement
2) MCU PWB replacement
(After work)
1) When the MCU PWB is replaced, perform simulations to input various set values and
1) When the MCU PWB is replaced, perform simulations to input various set values and
adjustment values.
NOTE
CASE 3
No
TROUBLE POSITION
CAUSE
CAUSE
Copy lamp light quantity abnormality
1) Copy lamp trouble
2) Copy lamp control PWB trouble
3) Copy lamp light quantity adjustment trouble
1) Copy lamp trouble
2) Copy lamp control PWB trouble
3) Copy lamp light quantity adjustment trouble
REMEDY
(Check)
1) Copy lamp
2) Copy lamp control PWB
3) Copy lamp light quantity level
1) Copy lamp
2) Copy lamp control PWB
3) Copy lamp light quantity level
(Remedy)
1) Copy lamp replacement
2) Copy lamp control PWB replacement
3) Copy lamp light quantity level adjustment
1) Copy lamp replacement
2) Copy lamp control PWB replacement
3) Copy lamp light quantity level adjustment
(After work)
1) Copy density adjustment
1) Copy density adjustment
NOTE
SELF DIAG CODE MESSAGE
E7
No
C7
PHENOMENON
DISPLAY
CODE
MAIN CODE
E7
SUB CODE
14
LAMP
TITLE
ASIC (MCU PWB) trouble
DETAIL
ASIC (MCU PWB) malfunction
SECTION
MCU PWB
ITEM
TYPE (MODE)
User
Warning
Service
YES
Trouble
YES
Other
Other
OPERATION MODE
All modes
Machine operation when the
message is displayed
message is displayed
Stop
NOTE
10 – 8
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