Read Sharp AL-840 (serv.man9) Service Manual online
No
C7
BASIC CAUSE 1
ASIC internal register operation trouble
CASE 1
No
TROUBLE POSITION
CAUSE
CAUSE
ASIC internal register operation trouble
ASIC (MCU PWB) trouble
ASIC (MCU PWB) trouble
REMEDY
(Check)
(Remedy)
MCU PWB replacement
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
SELF DIAG CODE MESSAGE
E7
No
C8
PHENOMENON
DISPLAY
CODE
MAIN CODE
E7
SUB CODE
15
LAMP
TITLE
Shading correction (white level) trouble
DETAIL
1) White level output abnormality during shading correction
2) White level output recognition error during shading correction
2) White 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
BASIC CAUSE 1
White level output recognition error during shading correction
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
(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
(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
White 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
10 – 9
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