Kyocera KM-1820 Service Manual page 81

2GM
Code
C6050 Abnormally low fusing unit ther-
mistor temperature
• The fusing temperature remains be-
low 90°C/194°F for 1 s.
C6400 Zero-crossing signal problem
• The engine PWB does not detect the
zero-crossing signal for the time
specified below.
At power-on: 3 s
Others: 5 s
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.
1-5-12
Contents
Causes Check procedures/corrective measures
Poor contact in Check the connection of connector YC4 on
the thermistor the power supply PWB and the continuity
connector termi- across the connector terminals. Repair or
nals. replace if necessary.
Measure the resistance. If it is ∞ Ω, replace
Broken thermistor
wire. the thermistor.
Thermistor in- Check and reinstall if necessary.
stalled incorrectly.
Thermal cutout Check for continuity. If none, replace the
triggered. thermal cutout.
Heater lamp in- Check and reinstall if necessary.
stalled incorrectly.
Broken heater Check for continuity. If none, replace the
lamp wire. heater lamp.
Poor contact in Check the connection of connectors YC7
the connector ter- on the engine PWB and YC2 on the power
minals. supply PWB, and the continuity across the
connector terminals. Repair or replace if
necessary.
Defective power Check if the zero-crossing signal is output
supply PWB. from YC2-11 on the power supply PWB. If
not, replace the power supply PWB.
Defective engine Replace the engine PWB if C6400 is de-
PWB. tected while YC2-11 on the power supply
PWB outputs the zero-crossing signal.
Poor contact in Reinsert the connector. Also check for con-
the operation tinuity within the connector cable. If none,
PWB connector remedy or replace the cable.
terminals.
Defective external Replace the operation PWB and check for
temperature ther- correct operation.
mistor.
Poor contact in Reinsert the connector. Also check for con-
the operation tinuity within the connector cable. If none,
PWB connector remedy or replace the cable.
terminals.
Defective external Replace the operation PWB and check for
temperature ther- correct operation.
mistor.
Remarks