2KA
1-4-53
C8910 Punch backup memory data problem
(optional of 3000-sheet document fin-
isher)
Read and write data does not match 3
times in succession.
Poor contact in the
connector termi-
nals.
Check the connection of connector on the
punch PWB and the connector YC4 on the
finisher main PWB, and the continuity
across the connector terminals. Repair or
replace if necessary.
Defective punch
PWB.
Replace the punch PWB and check for cor-
rect operation.
C8920 Mailbox backup memory data prob-
lem (optional mailbox of 3000-sheet
document finisher)
Read and write data does not match 3
times in succession.
Poor contact in the
connector termi-
nals.
Check the connection of connector on the
mailbox main PWB and the connector YC7
on the finisher main PWB, and the continuity
across the connector terminals. Repair or
replace if necessary.
Defective mailbox
main PWB.
Replace the mailbox main PWB and check
for correct operation.
C8930 Center-folding backup memory data
problem (optional center-folding unit
of 3000-sheet document finisher)
Read and write data does not match 3
times in succession.
Poor contact in the
connector termi-
nals.
Check the connection of connector on the
centerfold main PWB and the connector
YC5 on the finisher main PWB, and the con-
tinuity across the connector terminals.
Repair or replace if necessary.
EEPROM installed
incorrectly.
Install EEPROM correctly.
Defective center-
fold main PWB.
Replace the centerfold main PWB and
check for correct operation.
C9530 Contact the Service Administrative Division.
C9540 Contact the Service Administrative Division.
C9550 Contact the Service Administrative Division.
F000 Operation panel PWB communication
error
Defective main
PWB.
Replace the main PWB and check for cor-
rect operation.
Defective opera-
tion panel PWB.
Replace the operation panel PWB and
check for correct operation.
F020 Memory checksum error Defective main
PWB.
Replace the main PWB and check for cor-
rect operation.
Defective expan-
sion memory.
Replace the expansion memory and check
for correct operation.
F040 Engine PWB communication error Defective main
PWB.
Replace the main PWB and check for cor-
rect operation.
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation.
F050
Engine ROM checksum error Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation.
F278 Power source PWB secondary side
error
Defective power
source PWB.
Replace the power source PWB and check
for correct operation.
Code Contents
Remarks
Causes Check procedures/corrective measures