e-STUDIO160/200/250 FUSER UNIT/EXIT UNIT 14 - 8 December 2002 TOSHIBA TEC
Reference
1. The thermistor/ heater status counter never has values other than 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9
written on it.
• When the power is turned ON, if the heater lamp does not turn ON and service call C41 is dis-
played immediately, check the thermistor/heater status counter. If it is “2” or over, be sure to check
the thermistor and heater lamp. Then, after repairing or replacing, it is necessary to reset the
counter to “0”(code 400 in 08 mode) and then turn the power ON.
• If the thermistor/heater status counter should show “10” or over (e.g., 11), there is a possibility that
SRAM or the data in it may have been ruined. Check the bias, high-voltage transformers and
charge wires to see if any of them is defective, and repair if necessary. Then, you have to check all
the data inside SRAM.
2. Relationship between the thermistor output voltage and heat roller temperature:
Approx. 2.33V when the temperature is 190°C, approx. 2.53V when the temperature is 200°C and
approx. 0.1599V when the temperature is 40°C.
3. Relationship between the heat roller surface temperature and the heater thermistor 1 resistance.
Fig. 14-6-1
4. Temperature control at heat roller ends
During multi copying, the temperature on the ends of the heat roller (non-paper passage areas)
generally tends to become higher than that on the paper passage areas. This temperature is de-
tected by the heater thermistor 2; i.e. when it detects a temperature of 245°C or over, the heater
lamp is set to automatically turn itself OFF, regardless of the temperature on the paper passage
areas.
16_001
Values in ( ) are for e-STUDIO200/250 series.
Temperature Thermistor resistance Fuser lamp state
190 (200) °C or below 5.9KΩ (5.01KΩ) or over ON
190 (200) °C 5.9KΩ (5.01KΩ) The previous state kept intact
190 (200) °C or over 5.9KΩ (5.01KΩ) or below OFF
Values in ( ) are for e-STUDIO200/250 series.
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