Ricoh B022, Service Manual, Page: 357 / 878

ELECTRICAL COMPONENT DESCRIPTION
A860/B390 8-4 SM
1.4 ELECTRICAL COMPONENT DESCRIPTION
Symbol Name Function Index No.
Motors
M1 Tray Drives all rollers. 20
M2 Upper Lift Lifts the upper tray bottom plate. 3
M3 Lower Lift Lifts the lower tray bottom plate. 18
Sensors
S1
Upper Lift Detects when the paper in the upper tray is at
the correct feed height.
2
S2
Lower Lift Detects when the paper in the lower tray is at
the correct feed height.
19
S3
Upper Paper End Informs the copier/printer when the upper tray
runs out of paper.
13
S4
Lower Paper End Informs the copier/printer when the lower tray
runs out of paper.
14
S5 Vertical Transport Detects misfeeds. 12
S6
Upper Paper
Height 1
Detects the amount of paper in the upper tray.
5
S7
Upper Paper
Height 2 Detects the amount of paper in the upper tray.
4
S8
Lower Paper
Height 1 Detects the amount of paper in the lower tray.
11
S9
Lower Paper
Height 2 Detects the amount of paper in the lower tray.
10
Switches
SW1 Tray Cover Detects when the tray cover is opened. 8
SW2 Upper Paper Size Determines what paper size is in the upper tray. 16
SW3 Lower Paper Size Determines what paper size is in the lower tray. 15
Magnetic Clutches
MC1
Upper Paper
Feed Starts paper feed from the upper tray.
6
MC2
Lower Paper
Feed
Starts paper feed from the lower tray.
9
MC3 Relay Drives the relay rollers. 7
PCBs
PCB1
Tray Main Controls the paper tray unit and communicates
with the copier/printer.
1
Others
H1
Optional Tray
Heater Removes humidity from the paper in the trays.
17