Read Sharp AL-840 (serv.man9) Service Manual online
No
C5
BASIC CAUSE 1
Dark component level output is not recognized normally during shading correction.
CASE 1
No
TROUBLE POSITION
CAUSE
CAUSE
Scanner (reading) optical system does not transmit images (light) normally.
1) Scanner (reading) optical parts installing position shift
1) Scanner (reading) optical parts installing position shift
REMEDY
(Check)
1) Scanner (reading) optical parts installing position
(CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet)
1) Scanner (reading) optical parts installing position
(CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet)
(Remedy)
1) 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 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
Dark component output level 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.
2) When the CCD unit is replaced, adjust.
NOTE
CASE 3
No
TROUBLE POSITION
CAUSE
CAUSE
Copy lamp light quantity abnormality
1) Copy lamp trouble
2) Copy lamp control PWB rouble
3) Copy lamp light quantity adjustment trouble
1) Copy lamp trouble
2) Copy lamp control PWB rouble
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
C6
PHENOMENON
DISPLAY
CODE
MAIN CODE
E7
SUB CODE
12
LAMP
TITLE
Shading correction (output level) trouble
DETAIL
1) CCD output abnormality during shading correction
2) CCD level output recognition error during shading correction
2) CCD level output recognition error during shading correction
SECTION
Scanner (reading)
ITEM
TYPE (MODE)
User
Warning
Service
YES
Trouble
YES
Other
Other
OPERATION MODE
Copy
Machine operation when the
message is displayed
message is displayed
Stop
NOTE
10 – 7
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