Ricoh B234 Service Manual page 773

Number Name
PCBs
PCB25 Connector Board
PCB26 Relay Board
Number Name
Power Packs
PP1 CGB Power Pack
PP2 PPG Power Pack
PP3 Transfer Power Pack
Number Name
Sensors
S1 1st Paper End Sensor
S2 1st Paper Feed Sensor
S3 1st Tray Lift Sensor
S4 1st Tray Paper Height 1 Sensor
S5 1st Tray Paper Height 2 Sensor
S6 1st Tray Paper Height 3 Sensor
S7 1st Tray Paper Height 4 Sensor
S8 2nd Paper End Sensor
S9 2nd Paper Feed Sensor
S10 2nd Tray Lift Sensor
S11 3rd Paper End Sensor
S12 3rd Paper Feed Sensor
S13 3rd Tray Lift Sensor
S14 Cleaning Fabric End Sensor
S15 Double-Feed Detection LED
S16 Double-Feed Detection Sensor
SM
ELECTRICAL COMPONENT DESCRIPTIONS
Description
operation panel keys.
Interfaces between the SBU and SIB.
Interlock switch relay.
Description
Provides high voltage for the charge corona
wires, grid plate, and the development roller.
Provides high voltage for the corona wires
and grid plate in the pre-charge unit.
This power pack supplies the charge to the
image transfer roller that pulls the image off
the drum and onto the paper.
Description
Informs the CPU when tray 1 runs out of
paper.
Controls the 1st paper feed motor on/off
timing and the 1st pick-up solenoid off timing.
Detects the correct paper height for feeding
in the 1st tray.
Detects the paper height in the 1st tray
(tandem tray), stage 1.
Detects the paper height in the 1st tray
(tandem tray), stage 2.
Detects the paper height in the 1st tray
(tandem tray), stage 3.
Detects the paper height in the 1st tray
(tandem tray), stage 4.
Informs the CPU when tray 2 runs out of
paper.
Controls the 2nd paper feed motor on/off
timing and the 1st pick-up solenoid off timing.
Detects the correct paper height for feeding
in the 2nd tray.
Informs the CPU when tray 3 runs out of
paper.
Controls the 3rd paper feed motor on/off
timing and the 1st pick-up solenoid off timing.
Detects the correct paper height for feeding
in the 3rd tray.
Detects when the oil supply/cleaning fabric
has been used up.
The paper detection LED and sensor are
used in the new automatic double-feed
detection feature. This LED emits light which
is reflected from the paper to the double–
feed detection sensor to test the translucence
of each sheet.
Receives the light emitted from the double–
6-11 B234/B235/B236/D101/D102/D103