Ricoh G031, Service Manual

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ENGINE CONTROL BOARD
SM 2-43 G031/G032
Det
a
iled
De
s
c
ri
ptions
CN Description
CN1
Su5 V to the printer control board. Also passes the video, engine
control, and the serial data signals
CN3 Signals from the registration sensor and by-pass paper end sensor
CN4
Signals from the 1
st
tray paper size and paper end sensors. For the
G031, also from the 1
st
tray paper near-end sensor.
CN5 Signal from the toner near-end sensor
CN6
Signals from the fusing unit thermistor (hot roller temperature) and the fusing
exit sensor.
Determines whether a 120 V or 200 V fusing unit is installed.
CN7
Automatic laser power control signal, video signal
Polygon motor on/off and rotation speed control
Detects the polygon motor lock condition.
Signal from the laser synchronization detector (The detector is built into the LD
drive board in the G032.)
CN8/9
Signals from the sensors in the optional paper feed units. Control for the
clutches and motors
CN10 Main motor on/off control, and main motor lock detection
CN11 Turns the 1st tray paper feed clutch/solenoid on/off
CN12 Turns the by-pass tray solenoid on/off
CN13 Turns the registration clutch on/off (only used for G031)
CN14 Turns the fan motor on/off and controls the fan motor speed.
CN15 Controls the charge voltage, development bias, and transfer roller bias.
CN16
+5 V and +24 V from the PSU. The interlock switch cuts the +24 V when the
front cover is opened.
Controls the fusing unit safety relay
Turns the power to the fusing unit on/off.