3MJ
1-4-3
1-4-2 Self-diagnosis
(1) Self-diagnostic function
This unit is equipped with a self-diagnostic function. When a problem is detected, copying is disabled and the problem dis-
played as a code consisting of C followed by a number, indicating the nature of the problem.
A message is also displayed requesting the user to call for service.
After removing the problem, the self-diagnostic function can be reset by turning the main power switch off and back on.
(2) Self diagnostic codes
Code
Contents
Remarks
Causes
Check procedures/corrective measures
C8170
Built-in finisher front side registration
motor problem
When the front-side registration home-
position sensor is turned on during initial-
ization, the sensor did not turn on while it
has moved by 106 pulses.
When the front-side registration home-
position sensor is turned off during initial-
ization, the sensor did not turn on in 3 s.
The front side reg-
istration motor con-
nector makes poor
contact.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective front side
registration motor.
Replace front side registration motor.
The front side reg-
istration home
position sensor
connector makes
poor contact.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective front side
registration home
position sensor.
Replace the front side registration home
position sensor.
Defective finisher
control PWB.
Replace the finisher control PWB and check
for correct operation.
C8180
Built-in finisher rear side registration
motor problem
When the rear-side registration home-
position sensor is turned on during initial-
ization, the sensor did not turn on while it
has moved by 106 pulses.
When the rear-side registration home-
position sensor is turned off during initial-
ization, the sensor did not turn on in 3 s.
The rear side reg-
istration motor con-
nector makes poor
contact.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective rear side
registration motor.
Replace rear side registration motor.
The rear side reg-
istration home
position sensor
connector makes
poor contact.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective rear side
registration home
position sensor.
Replace the rear side registration home
position sensor.
Defective finisher
control PWB.
Replace the finisher control PWB and check
for correct operation.
Содержание DF-420
Страница 1: ...SERVICE MANUAL Published in May 2009 3MZSM060 First Edition DP 420 PF 420 DF 420 JS 420 FAX System R ...
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