Olivetti d-Copia 1600 Service Manual page 115

Code
C6400 Zero-crossing signal problem
The engine PWB does not detect the
zero-crossing signal for the time speci-
fied below.
At power-on: 3 s
Others: 5 s
C7750 Drum type mismatch problem A
The drum type does not mach with the
software.
C7760 Drum type mismatch problem B
The drum type is undefined.
C7800 Broken external temperature ther-
mistor
The input voltage is 0.5 V or less.
C7810 Short-circuited external temperature
thermistor
The input voltage is 4.5 V or more.
Contents
Causes Check procedures/corrective measures
Poor contact in the Reinsert the connector. Also check for conti-
connector termi- nuity within the connector cable. If none,
nals. remedy or replace the cable.
Defective power Check if the zero-crossing signal is output
supply PWB. from YC2-5 on the power supply PWB. If
not, replace the power supply PWB.
Defective engine Replace the engine PWB if C6400 is
PWB. detected while YC2-5 on the power supply
PWB outputs the zero-crossing signal.
Defective software Rewrite the software of the engine PWB.
of the engine PWB.
Defective engine Replace the engine PWB and check for cor-
PWB. rect operation.
Defective software Rewrite the software of the engine PWB.
of the engine PWB.
Defective engine Replace the engine PWB and check for cor-
PWB. rect operation.
Poor contact in the Reinsert the connector. Also check for conti-
humidity sensor nuity within the connector cable. If none,
connector termi- remedy or replace the cable.
nals.
Defective humidity Replace the drawer PWB and check for cor-
sensor. rect operation.
Poor contact in the Reinsert the connector. Also check for conti-
humidity sensor nuity within the connector cable. If none,
connector termi- remedy or replace the cable.
nals.
Defective humidity Replace the drawer PWB and check for cor-
sensor. rect operation.
Remarks
2HA/2HB
1-4-19