Ricoh D109 Service Training page 69

Contact release
solenoid
Contact release gear
Main motor
Slide 69
Hot Roller Drive
Mechanism
The main motor drives the hot roller through a gear train. One of the gears in the
gear train is the contact-release gear. This gear is linked to the contact-release
solenoid. When the contact-release solenoid is activated, it separates the
contact-release gear from another gear in the gear train.
Drive power of the main motor is not transmitted to the hot roller.
Drive power of the main motor is not transmitted to the paper exit roller. This
roller is driven by the exit motor.
Contact/Release Control
The contact-release solenoid comes on at these times:
When the copier warms the hot roller.
When the hot roller temperature is 18°C or higher.
Fusing idling (SP 1103 1) is set to "No."
Control is based on these:
The copier takes a shorter time to heat the hot roller when the roller isn't
turning.
The temperature of the hot roller surface may get uneven when the hot
roller temperature is low and the roller does not turn.
Hot Roller Drive
Hot roller
69
Paper exit roller
S-C4L Training