Ricoh FT8680 Service Manual page 14

31 July 1995
Name
Drum Current Detection
Main
Motor Control
Operation Unit
PTL
Quenching Lamp
Interface
Vacuum Motor
Power Packs
Charge
Development Bias
PTC
Separation
Transfer
Power Supply Unit
Relays
Anticondensation Heater Provides power to the anticondensation heater.
Drum Heater 1
Drum Heater 2
Fusing SSR
Relay Unit
Sensor
Auto Response
By-pass Table
Drum Potential
Duplex Entrance
End Fence Home
Position
Exit
Fusing Unit
Image Density
Jogger Home Position
Lens Horizontal Encoder Detects the lens horizontal drive motor operation.
Lens Horizontal Home
Position
Lens Vertical Encoder
Lens Vertical Home
Position
Lower Limit - 1st Tray
Lower Limit - 2nd Tray
ELECTRICAL COMPONENT DESCRIPTIONS
Measures the corona current.
Controls overall machine operation.
Controls the dc motors.
Controls the monitor display.
Controls the pre-transfer lamp operation.
Controls the quenching lamp operation.
Interface between the main PCB and other PCBs.
Controls the vacuum fan motor operation.
Provides power for the charge corona wire.
Provides power for the development bias.
Provides power for the pre-transfer corona wire.
Provides power for the separation corona wire.
Provides power for the transfer corona wire.
Provides dc power to dc components.
Provides power to the drum heater.
Provides power to the drum heater.
Provides power to the fusing lamp.
Provides ac power to ac components.
Turns on the display from the screen saver condition.
Detects when the by-pass table is opened and
indicates the display on CRT screen.
Detects the drum surface voltage.
Detects misfeeds.
Detects when the duplex end fence is at the home
position
Detects misfeeds.
Detects misfeeds.
Measures the density of the image on the drum.
Detects when the duplex side plate is at the home
position.
Detects when the lens is at the horizontal home
position.
Detects the lens vertical drive motor operation.
Detects when the lens is at the vertical home position.
Turns off the 1st tray motor when the tray reaches the
down position.
Turns off the 2nd tray motor when the tray reaches
the down position.
1-11
Function Index. No.
106
121
124
127
120
119
114
108
103
104
107
105
126
118
112
113
110
111
117
93
34
100
137
136
10
9
87
131
5
4
7
6
48A
48B