Ricoh FT3320 Service Training Manual page 222

1 Nov. '87
FUSING
2-3 E5
- Definition -
Lights if the hot roller temperature does not increase at Ieast 2 degrees
C within 10 seconds after the power is turned on.
Lights if the hot roller temperature does not reach 140 degrees C within
75 seconds after the power is turned on.
Lights if the hot roller temperature goes above 230 degrees C.
- Possible Causes -
Fusing lamp burned out
Thermoswitch open
Thermistor open
Lamp control PCB defective
Main PCB defective.
- Action -
Does the fusing lamp turn on?
Is the fusing thermistor open?
Y
N
I
Replace the main PCB.
Replace the fusing thermistor.
fusing thermistor shorted?
Y
1
Replace the thermistor.
fusing lamp/fusing thermoswitch open?
Y
Replace the fusing lamp/fusing thermoswitch.
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