Ricoh DD 5450, Field Service Manual

Page: 167 / 403

３
165
Chapter 3 Drum Section
1
2
CN3-5
-6
CN3-2
CN11-41
(4) Drum Switch
Description
The drum switch detects whether a drum is installed to the machine.
When the drum switch detects that there is no drum installed, "NO DRUM" is displayed on the LCD
panel and the machine stops operation.
When no drum is detected during operation, all the operations stop urgently.
Operation
When the drum is installed to the machine, the cam unit covers the pin and is locked firmly.
The difference of the cam unit prevents the cam unit from being loosened due to the machine
vibration.
When the pin is at the bottom of the cam unit difference, the drum switch is on as shown in the
illustration. When the pin is over the cam unit difference, the drum switch is off.
SET
EJECT
Circuit
Drum switch
No drum : CLOSE
Drum installed: (PUSH) OPEN
White
White
ON : 0V
OFF: 5V
Main motor PCB unit
● Drum installed
● No drum
Switch ON Switch OFF
Drum switch
Main PCB unit
Black
7