Olivetti d-Copia 600, Service Manual

Page: 193 / 454

1-5-37
C6050 Fuser thermistor abnormal tempera-
ture detection
• During copying, the temperature at the
heat roller lower than 120
°
C/248
°
F is
detected continuously for 5 s.
Installation defec-
tiveness on fuser
thermistor M and
S. Check the mounting state of the fuser ther-
mistor M and S. If any problem is found,
repair it.
Operation on fuser
thermostat. Check for continuity. If none, replace the
fuser thermostat.
Installation defec-
tiveness on fuser
heater L, M or S. Check the mounting state of the fuser ther-
mistor L, M and S. If any problem is found,
repair it.
Broken fuser
heater L, M and S
wire. Check for continuity. If none, replace the
fuser heater L, M and S (see page 1-6-76).
C6400 Zero-cross signal error
• The main PWB does not detect the
zero-crossing signal (Z CROSS SIG)
for 5 s.
Poor contact in the
connector termi-
nals. Check the connection of connectors YC11
on the main PWB and YC6 on the DC power
source PWB, and the continuity across the
connector terminals. Repair or replace if
necessary.
Defective DC
power source
PWB. Check if the zero-crossing signal is output
from YC6-3 on the DC power source PWB.
If not, replace the DC power source PCB.
Defective main
PWB. Replace the main PWB if C6400 is detected
while YC6-3 on the DC power source PWB
outputs the zero-crossing signal.
C7200 Broken internal thermistor wire
• The thermistor output value is 4.5 V or
more.
Poor contact in the
connector termi-
nals. Check the connection of connector YC23 on
the engine PWB and the continuity across
the connector terminals. Repair or replace if
necessary.
Defective develop-
ing humidity sen-
sor. Replace the developing humidity sensor.
C7210 Short-circuited internal thermistor
• The thermistor input value is 0.5 V or
less.
Poor contact in the
connector termi-
nals. Check the connection of connector YC23 on
the engine PWB and the continuity across
the connector terminals. Repair or replace if
necessary.
Defective develop-
ing humidity sen-
sor. Replace the developing humidity sensor.
C7300 Toner hopper problem
• Toner level is not detected when toner
empty is detected.
Defective toner
level detection sen-
sor. Replace the toner level detection sensor.
Poor contact in the
toner level detec-
tion sensor con-
nector terminals. Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
C7800 Broken external thermistor wire
• The thermistor output value is 4.5 V or
more.
Poor contact in the
connector termi-
nals. Check the connection of connector YC13 on
the engine PWB and the continuity across
the connector terminals. Repair or replace if
necessary.
Defective humidity
sensor. Replace the humidity sensor.
Code Contents
Remarks
Causes Check procedures/corrective measures
Y104350-7 Sevice Manual