Service manual

2DA/2DB
1-5-23
Code Contents
Remarks
Causes Check procedures/corrective measures
C6000
C6020
C6050
C6400
C7800
Broken fixing heater wire
•In fixing warm-up, the time to reach
50°C/122 °F exceeds 13.5 s, the time
to reach 100°C/212 °F exceeds 10 s,
the time to reach the primary stabili-
zation exceeds 10 s or the time to
reach the secondary stabilization ex-
ceeds 24 s.
Abnormally high fixing unit ther-
mistor temperature
• The fixing temperature exceeds
230°C/446 °F for 40 ms.
Abnormally low fixing unit ther-
mistor temperature
• The fixing temperature remains below
90°C/194°F for 1 s.
Zero-crossing signal problem
• The engine PCB does not detect the
zero-crossing signal for the time
specified below.
At power-on: 3 s
Others: 5 s
Broken external temperature ther-
mistor
• The input voltage is 0.5 V or less.
Fixing heater M or
S installed incor-
rectly.
Broken fixing
heater M or S
wire.
Shorted ther-
mistor.
Broken heater
control circuit on
the power supply
PCB.
Poor contact in
the thermistor
connector termi-
nals.
Broken fixing ther-
mistor wire.
Fixing thermistor
installed incor-
rectly.
Fixing thermostat
triggered.
Fixing heater M or
S installed incor-
rectly.
Broken fixing
heater M or S
wire.
Poor contact in
the connector ter-
minals.
Defective power
supply PCB.
Defective engine
PCB.
Poor contact in
the humidity sen-
sor connector ter-
minals.
Defective humidity
sensor.
Check and reinstall if necessary.
Check for continuity. If none, replace the
fixing heater M or S.
Measure the resistance. If it is 0 Ω, replace
the thermistor.
Replace the power supply PCB and check
for correct operation.
Reinsert the connector. Also check for con-
tinuity within the connector cable. If none,
remedy or replace the cable.
Measure the resistance. If it is ∞ Ω, replace
the fixing thermistor.
Check and reinstall if necessary.
Check for continuity. If none, replace the
fixing thermostat.
Check and reinstall if necessary.
Check for continuity. If none, replace the
fixing heater M or S.
Reinsert the connector. Also check for con-
tinuity within the connector cable. If none,
remedy or replace the cable.
Check if the zero-crossing signal is output
from YC2-5 on the power supply PCB. If
not, replace the power supply PCB.
Replace the engine PCB if C6400 is de-
tected while YC2-5 on the power supply
PCB outputs the zero-crossing signal.
Reinsert the connector. Also check for con-
tinuity within the connector cable. If none,
remedy or replace the cable.
Replace the drawer PCB and check for
correct operation.