Service manual

FIXING UNIT
2-O-3
2 UNIT EXPLANATION
*1 Fixing heater lamps
Two halogen lamps are used for the fixing upper
roller and one halogen lamp is used for the fixing
heat roller. These halogen lamps are intended to
reduce the warm-up time.
*2 Cleaning
Fixing upper roller:
Cleaning web is used to clean the fixing upper
roller. The cleaning web wind-up shaft is driven
intermittently by the web drive motor (M16) via
gears to supply cleaning web from the web roll.
Since the number of turns of the motor is con-
trolled according to the copy count, the amount of
cleaning web supplied is approx. 0.022 to 0.058
mm/copy. A cleaning web which contains silicon
oil is pressed against the fixing upper roller by the
pressure roller.
Fixing heat roller:
The scraper cleans stains on the fixing heat
roller.
*3 Fixing heat roller
The fixing heat roller incorporating one halogen
lamp rotates keeping contact with the fixing lower
roller. Thus, the fixing lower roller is heated. The
fault detection mechanism is similar to that for
the fixing upper roller. It is used to detect
extremely high or lower temperature and a sen-
sor fault.
*4 Fixing roller pressure/release
Pressure on the fixing lower roller to contact to
the upper roller is applied or released by rotating
the pressure release levers (two) provided at the
front and back of the fixing unit.
Caution: Be sure to perform pressure release
with the fixing upper cover closed.
Cleaning web
wind-up shaft
Pressure
roller
Fixing lower
roller
Scraper
Fixing heat roller
Fixing
upper
roller
Cleaning web
unwinding shaft
Cleaning web
Pressure
spring
Pressure
release shaft
Pressure
applied
Pressure
released
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