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Code
C6000
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.
C6020
Abnormally high fixing unit ther-
mistor temperature
• The fixing temperature exceeds
230°C/446 °F for 40 ms.
C6050
Abnormally low fixing unit ther-
mistor temperature
• The fixing temperature remains below
90°C/194°F for 1 s.
C6400
Zero-crossing signal problem
• The engine board (KP-5061) does not
detect the zero-crossing signal for the
time specified below.
At power-on: 3 s
Others: 5 s
Contents
Causes
Check procedures/corrective measures
Poor contact in
Check the connection of connector CN4 on
the thermistor
the power supply board (KP-5059) and the
connector termi-
continuity across the connector terminals.
nals.
Repair or replace if necessary.
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.
Measure the resistance. If it is 0 Ω, replace
Shorted ther-
mistor.
the thermistor.
Broken heater
Replace the power supply board (KP-5059)
control circuit on
and check for correct operation.
the power supply
board (KP-5059).
Poor contact in
Check the connection of connector CN4 on
the thermistor
the power supply board (KP-5059) and the
connector termi-
continuity across the connector terminals.
nals.
Repair or 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 board (KP-5061) and CN2
minals.
on the power supply board (KP-5059), and
the continuity across the connector termi-
nals. Repair or replace if necessary.
Defective power
Check if the zero-crossing signal is output
supply board (KP-
from CN2-11 on the power supply board
5059).
(KP-5059). If not, replace the power supply
board (KP-5059).
Defective engine
Replace the engine board (KP-5061) if
board (KP-5061).
C6400 is detected while CN2-11 on the
power supply board (KP-5059) outputs the
zero-crossing signal.
Remarks
2DC
1-5-11
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