FS-6020
1-5-6
(1-4) Error code 6000 [E4] (fixing heater lamp/fixing thermistor error)
Detection conditions
• The fixing thermistor disconnection detection circuit in the engine/high voltage PWB outputs the disconnection detection
signal (THDEAD) to the CPU more than a specified time after power is turned on.
• The fixing temperature does not rise at least 1 °C when the fixing heater lamp is continuously on for approximately 20
seconds during printer warm-up or in the standby mode.
• The fixing temperature does not rise at least 1 °Cwhen the fixing heater lamp is continuously on for approximately 15
seconds during printing.
• The fixing temperature does not lower when the fixing heater lamp is off for a specified time or more.
* The fixing temperature is the average value calculated using the input voltage from the fixing thermistor detected several
times in a specified time to avoid influence of noise and so on.
Corrective measures
Is there any damage to
the harness (S028??) between
the fixing unit and the engine/high voltage
PWB or improper connection at the YC5
connector on the engine/high-
voltage PWB?
Does the error
occur several seconds
after the message “Please
Wait” is displayed?
If any problem is found on the
harness or the connector,
repair or replace it.
Replace the engine/high voltage
PWB. (See page 1-6-26.)
Replace the engine/high voltage
PWB. (See page 1-6-26.)
End
Ye s
Ye s
Ye s
Ye s
No
Is there any damage to
the harness (S02823) between
the fixing unit and the power supply PWB or
improper connection at the CN2
connector on the power
supply PWB?
If any problem is found on the
harness or the connector,
repair or replace it.
No
No
No
No
OK?
Start
Remove the YC5 connector from the
engine/high-voltage PWB and measure the
resistance between the pins (fixing thermistor).
Replace the fixing unit (fixing thermistor).
(See pages 1-6-18 and 23.)
Is the resistance
∞?(See the remarks.)
Is the
resistance ∞?
Replace the power supply
PWB. (See page 1-6-29.)
Ye s
Ye s
No
Remove the CN2 connector from the
power supply PWB and measure the
resistance between the pins.
Replace the fixing unit (fixing heater
lamp). (See pages 1-6-19.)
Cautions
Be careful when handling the fixing unit because it is hot.
Take care not to get an electric shock because AC power is supplied from the power source PWB to the fixing unit.
Remarks
The resistance depends on the ambient temperature of
the fixing thermistor. The relation between the ambient
temperature and the resistance is shown below.
Ambient temperature
0 °C Approx. 980 kΩ
10 °C Approx. 650 kΩ
25 °C Approx. 360 kΩ
Resistance
* Possible defective locations
(causes)
• Engine/high voltage PWB
• Fixing unit
• Power source PWB
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