2.3 ELECTRICAL COMPONENT DESCRIPTION
Refer to the electrical component layout on the reverse side of the Point to
Point Diagram (on waterproof paper).
Symbol Index No. Description Note
Motors
M1 4 Main Drives all the paper tray components
Circuit board
PCB1 1 Interface board
Controls the paper feed tray unit in response
to signals from the copier
Sensors
S1 2 Tray set 1
Detects whether the paper tray is in place
S2 3 Tray set 2
S3 10 Relay 1 Detects when the leading edge of the paper
leaves the paper tray, to determine copier
relay clutch timing and jam detection timing
S4 11 Relay 2
S5 5 Paper end 1
Detects when the paper tray runs out of paper
S6 6 Paper end 2
Switches
SW1 12 Tray cover
Detects whether the tray unit cover is open,
and cuts the 24 Vdc line if it is.
Clutches
CL1 7 Paper feed 1
Starts to feed paper from the tray
CL2 8 Paper feed 2
CL3 9 Relay Drives the rollers in the paper trays
Heaters
H1 13 Tray (Option) Turns on when the main switch is off, to keep
the paper in the trays dry
H2 14 Tray (Option)
Paper Tray Unit
A553
STM 5-3 A156/A160/A162
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