Ricoh AC104, Сервисная документация

Страница: 143 / 160

ENGINE F/W
SM 6-13 B173
Detailed
Des
cription
s
6.6.4 FUSING
The resistance of the thermistor varies inversely with the temperature of the hot
roller. The control circuit monitors the temperature through the thermistor and turns
the fusing lamp on and off. This keeps the hot roller at the operating temperature.
Error Type
Error Description
Open heat error Goes lower than 68°C for 28 seconds at the time of warm up
Lower heat error
•
Standby:
Goes lower than 80°C over 10 seconds
•
Print mode:
1. Goes lower than 145°C for 4 seconds for consecutive
pages.
2. Sets at 25°C or lower than the fixed fusing temperature
over 4 seconds for consecutive pages.
Over heat error Goes higher than 220°C for 3 seconds
6.6.5 LSU
The LSU consists of the LD (Laser Diode) and the polygon motor. The LD turns
and drives the polygon motor when it gets a print signal. Hsync occurs when the
light part gets the beam. LReady occurs when the polygon motor speed gets to a
correct condition. The LSU controller gets to 1 when the LSU is ready. If not, an
error is shown.
Error Type
Error Description
Polygon motor error When the polygon motor's speed is not correct
Hsync error
The polygon motor's speed is correct, but the Hsync signal is not
shown.