Error Code 6000 [E4] (Fixing Heater Lamp/Fixing Thermistor Error) - Kyocera Mita FS-6020 Service Manual

FS-6020

(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
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.
Start
Does the error
occur several seconds
after the message "Please
Wait" is displayed?
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?
Remove the YC5 connector from the
engine/high-voltage PWB and measure the
resistance between the pins (fixing thermistor).
Is the resistance
∞?(See the remarks.)
Yes
Replace the fixing unit (fixing thermistor).
(See pages 1-6-18 and 23.)
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
10 °C
25 °C
1-5-6
* Possible defective locations
(causes)
• Engine/high voltage PWB
• Fixing unit
• Power source PWB
No
Yes
No
If any problem is found on the
Yes
harness or the connector,
repair or replace it.
No
Replace the engine/high voltage
PWB. (See page 1-6-26.)
Resistance
Approx. 980 kΩ
Approx. 650 kΩ
Approx. 360 kΩ
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?
Yes
Remove the CN2 connector from the
power supply PWB and measure the
resistance between the pins.
Is the
No
resistance ∞?
Yes
Replace the fixing unit (fixing heater
lamp). (See pages 1-6-19.)
Replace the engine/high voltage
PWB. (See page 1-6-26.)
No
If any problem is found on the
harness or the connector,
repair or replace it.
Replace the power supply
PWB. (See page 1-6-29.)
No
OK?
Yes
End