Ricoh G031 Service Manual page 87

CN
Supplies +5 V to the printer control board. Also passes the video, engine
CN1
control, and the serial data signals
CN3 Signals from the registration sensor and by-pass paper end sensor
Signals from the 1
CN4
G031, also from the 1
CN5 Signal from the toner near-end sensor
Signals from the fusing unit thermistor (hot roller temperature) and the fusing
exit sensor.
CN6
Determines whether a 120 V or 200 V fusing unit is installed.
Automatic laser power control signal, video signal
Polygon motor on/off and rotation speed control
CN7 Detects the polygon motor lock condition.
Signal from the laser synchronization detector (The detector is built into the LD
drive board in the G032.)
Signals from the sensors in the optional paper feed units. Control for the
CN8/9
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.
+5 V and +24 V from the PSU. The interlock switch cuts the +24 V when the
front cover is opened.
CN16
Controls the fusing unit safety relay
Turns the power to the fusing unit on/off.
SM
Description
st
tray paper size and paper end sensors. For the
st
tray paper near-end sensor.
2-43
ENGINE CONTROL BOARD
G031/G032