Oki Data CONFIDENTIAL
42049001TH Rev.1 81 /
5 Fuser Unit Error
• Does a fuser unit error occur immediately after the printer is turned on?
(A)
• YES Is the heat roller thermistor broken or short-circuited (see figure 5-1)? (approx. 190 k to 980
kΩ at room temperatures of 0 to 43˚C)
• YES Replace the fuser unit.
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• NO
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• NO Does a fuser unit error occur about one minute after printer is turned on?
• NO Go to (A).
▼
• YES Is the heater of the fuser unit on (Is it hot)?
• YES Replace the engine board. Has the problem been corrected?
• YES End.
▼
• NO Replace the fuser unit.
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• NO Is AC voltage being output between the low voltage unit CN2 connector pins 1 and 3?
• NO Replace the low-voltage power unit. Has the problem been corrected?
• YES End.
▼
• NO Replace the engine board.
▼
• YES Replace the fuser unit.
Figure 5.1
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Heat Roller Thermistor
The resistance between these two pins
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