Ricoh 002052MIU User Guide - Page 139

Cover Open Sensor, DC FAN / SOLENOID Drive, Motor Drive, There are two solenoids

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Page 139 highlights

MAIN BOARD Cover Open Sensor: The cover open sensor is located on the front cover. The +24V (DC fan, solenoid, main motor, polygon motor part of LSU, HVPS), to each unit is cut off when the front cover is opened. The CPU operates the cover-open sensor and the developer ID sensor. DC FAN / SOLENOID Drive: Driven by transistor and controlled by the CPU. When it is set high, the transistor turns on and drives the fan. It goes off when the sleep mode is set. There are two solenoids, driven by the paper pick-up and MP signal. The drive time is 300 ms. A diode prevents the transistor from the noise pulse generated when the solenoid is de-energizing. Motor Drive: The motor drive circuit starts when the driver IC is set. You can set the R sensor value and the voltage value of the V reference with the motor drive voltage value. Detailed Descriptions SM 6-9 B173

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MAIN BOARD
SM
6-9
B173
Detailed
Descriptions
Cover Open Sensor:
The cover open sensor is located on the front cover. The +24V (DC fan, solenoid,
main motor, polygon motor part of LSU, HVPS), to each unit is cut off when the
front cover is opened. The CPU operates the cover-open sensor and the developer
ID sensor.
DC FAN / SOLENOID Drive:
Driven by transistor and controlled by the CPU.
When it is set high, the transistor turns on and drives the fan. It goes off when the
sleep mode is set.
There are two solenoids, driven by the paper pick-up and MP
signal. The drive time is 300 ms. A diode prevents the transistor from the noise
pulse generated when the solenoid is de-energizing.
Motor Drive:
The motor drive circuit starts when the driver IC is set. You can set the R sensor
value and the voltage value of the V reference with the motor drive voltage value.