Oki C9850 Maintenance Manual page 210

Poor Fusion (lightly touching the toner causes the toner to wipe off or fall off)
• Is standard paper used?
NO
• YES Fuser Unit contact properly connected?
NO
• YES Is the fuser unit roller dirty?
YES
• NO Is the [Paper Thickness] (Menu 1) properly set?
NO
• YES Is there an AC voltage output between CN connector Pin 1 and 3 of the low
voltage power unit?
NO
• 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:
NO
• YES 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:
NO
• YES Does the fuser temperature match the set temperature?
Check the fuser temperature on the LCD of the engine Maintenance Mode display.
NO
• YES Replace the fuser unit.
1. When replacing the Engine PCB (S2V PWB), remove the EEPROM from the old
Note!
PCB, then mount that EEPROM on the new PCB.
2. If the EEPROM is not going to be replaced, refer to Section 5.2.2.
43627911TH Rev. 3
Use standard paper.
Properly connect the fuser unit contact.
Replace the fuser unit.
Properly set the [Paper Thickness].
Replace the low voltage power unit.
Pins 1 & 2 = 4194 to 696.6kΩ
Pins 3 & 4 = 642.1 to 122.4kΩ
Pins 5 & 6 = 642.1 to 122.4kΩ
Replace the fuser unit.
Pins 1 & 2 = 642.1 to 122.4kΩ
Replace the fuser unit.
Replace the fuser unit.
Oki Data CONFIDENTIAL
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