Olivetti DF-790 Service Manual page 77

Code Contents
8520 MB conveying motor error 2
When standby operation, MB
home position sensor does
not turn off within 1 s.
8800 Document finisher commu-
nication error
Communication with the docu-
ment finisher is not possible.
8900 Document finisher backup
error
Read and write data does not
match 3 times in succession.
Y113480-7
Causes
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. MB conveying motor and MB main PWB
(YC5)
MB home position sensor and MB main
PWB (YC2)
Defective MB Replace the MB home position sensor.
home position sen-
sor.
Defective MB con- Replace the MB conveying motor.
veying motor.
Defective MB main Replace the MB main PWB and check for
PWB. correct operation.
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector (4000-sheet DF main PWB (YC4) and engine PWB
(YC18)
finisher).
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector (1000-sheet DF main PWB (YC7) and engine PWB
finisher). (YC18)
Defective PWB. Replace the DF main PWB or the engine
PWB and check for correct operation.
(see page 1-5-2)
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector (4000-sheet DF main PWB (YC4) and engine PWB
finisher). (YC18)
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector (1000-sheet DF main PWB (YC7) and engine PWB
finisher). (YC18)
Improper installa- Check the installation of the EEPROM and
tion EEPROM. remedy if necessary.
Defective DF main Replace the DF main PWB and check for
PWB. correct operation.(see page 1-5-2)
1-4-24
3NB/3ND/3N0/3NK
Check procedures/
corrective measures
Sevice Manual