Oki C9850

Oki Data CONFIDENTIAL
43627911TH Rev. 3
202 /
Halogen Lamp
Thermistor
Bottom of Fuser Unit
1 2 3 4 5 6 4 3
7 6 5 4 3 2 1 2 1
6 poles
7 poles
Halogen Lamp
7-pole side
Pins 1 & 2: Non contact
Pins 3 & 4: Correction
Pins 5 & 6: Side thermistor
6-pole side
Pins 1 & 2: Lower thermistor
Fuser Unit Error
• Immediately after turning ON the power, does a fuser error occur?
(A)
• YES Are the three Upper Roller Thermistors down or short-circuited? (See
Figure 7-1.)
At an ambient temperature between 0 and 43˚C: 7-pole side:
Pins 1 & 2 = 4194 to 696.6k
Ω
Pins 3 & 4 = 642.1 to 122.4k
Ω
Pins 5 & 6 = 642.1 to 122.4k
Ω
YES Replace the fuser unit.
•
NO Is the thermistor on the lower side down or short-circuited? (See Figure 7-1.)
At an ambient temperature between 0 and 43˚C: 6-pole side:
Pins 1 & 2 = 642.1 to 122.4k
Ω
YES Replace the fuser unit.
• NO
• NO After turning ON the power, wait 3 minutes. Does a fuser unit Error occur?
NO Go to (A).
• Is the fuser unit heater ON? (Is it HOT?)
• YES Replace the engine control PCB.
• NO Replace the fuser unit.
•NO Is there an AC voltage output between Pin 1 and Pin 3 of the CN1 connector of the
Low Voltage Power Unit?
NO Replace the low voltage power unit.
• YES Replace the fuser unit.
Figure 7-1