Sharp AR-800 imager Manual de serviço - Página 19
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14. FUSER UNIT
Reference
1. The Thermistor status counter normally has a value of between 0 and 9.
• At the power on, if the heater is not turned ON and the copier goes into C41 CALL SERVICE, check the
Thermistor status counter to see if it is 2 or more. If it is 2 or more, be sure to check the thermistor and
heater lamp, and after repair, reset the Thermistor status counter (08-code 400) to 0 and then turn ON
the power switch.
•
If the counter has a value 10 or greater (11 for example), the BC-RAM or the data in it have been
destroyed by charger leakage, etc. In this case, check the guide bias, high-voltage transformers,
charger wires, etc. for any defects. Also, all the data inside BC-RAM needs to be rechecked.
2. Relationship between the output voltage and the fusing temperature.
• 200°C corresponds to approx. 2.5V and 0.25 V corresponds to approx. 40°C.
3. Relationship between heat roller surface temperature and fuser lamp operation.
(AR-650)
Temperature
Less than 200°C
ON
Maintains previous status
200°C
More than 200°C
OFF
(AR-800)
Temperature
200°C or above
Heater lamp OFF
Heater lamp ON
170~200°C
160~170°C
Copying is continued at a
lower speed.
Copying is interrupted and
160°C or below
the machine is reset to the
ready state.
4. Temperature control at heat roller ends
During multicopying, the temperature at each end (no paper-contact area) of the heat roller normally tends
to rise higher than the controlled temperature of the paper-contact area. Therefore, the circuit is designed so
that if the temperature in the no paper-contact area rises to 240°C, the second thermistor detects this,
causing the heater to be turned OFF immediately regardless of the temperature in the paper-contact area.
Heater lamp state
Heat roller
temperature
distribution
Fusing control
Normal copy speed
Warm-up
Standby (200°C)
C
200
Heater lamp
OFF
ON
OFF
ON
Warm up
Standby(200 )
˚C
200
170
160
Heater lamp
OFF
ON
OFF
ON
Copy speed
0
0
14 - 1
Copying (200°C)
ON
OFF
ON
OFF
ON
OFF
Standby
Copying
Copying
(200 )
ON
ON
ON
ON
ON ON
ON
0
80 65 80 65
0
80
65
FUSER UNIT
ON
OFF
Waiting
ON
0