Ricoh A230, Руководство по обслуживанию, Страница: 992 / 1134

RICOH GROUP COMPANIES
CONTROL NO. 348
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SUBJECT: HOT ROLLER SCRATCHED BY THERMISTOR
SYMPTOM:
The Hot Roller is scratched by hard toner stuck on the Thermistor. A black line may appear on the copy in
cases where the scratch is deep.
CAUSE:
The toner mixes with paper dust and adheres to the surface of the Thermistor. This mixture hardens as the
fusing temperature increases and decreases. The amount and the hardness of the toner/paper dust mixture
adhered to the Thermistor are affected by the type of paper and operating conditions. Therefore these
conditions may only exist on a limited number of machines.
SOLUTION:
Replace the old style Thermistor with the new style Thermistor. The thickness of the Teflon cover on the
new style Thermistor has been increased. This will reduce the pressure on the Hot Roller in the event that a
toner/paper dust mixture adheres to the Thermistor. See Diagram A below.
Diagram A
Continued…
No
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Thi
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i
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o
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