
No C7
BASIC CAUSE 1 ASIC internal register operation trouble
CASE 1 No
TROUBLE POSITION
CAUSE
ASIC internal register operation trouble
ASIC (MCU PWB) trouble
REMEDY (Check)
(Remedy)
MCU PWB replacement
(After work)
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
SECTION Scanner (reading)
ITEM
TYPE (MODE) User Warning
Service YES Trouble YES
Other Other
OPERATION MODE Copy Machine operation when the
message is displayed
Stop
NOTE
BASIC CAUSE 1 White level output recognition error during shading correction
CASE 1 No
TROUBLE POSITION
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
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)
(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)
After work
1) Copy density adjustment
NOTE
CASE 2 No
TROUBLE POSITION
CAUSE
White level output recognition error during shading correction
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
(Remedy)
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
adjustment values.
NOTE
FO-3800M
10 – 9
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