Service manual

FO-4700U
FO-47UC
3 – 3
3. PRINTER ENGINE ELECTRICAL COMPONENTS LAYOUT
Fig. 3
4. ELECTRICAL PARTS IDENTIFICATION
H1
PS3
TH1
TS1
M3
M1
PWB-B
PWB-A
PWB-G
PWB-D
PS1
PS5A
PS5B
SL1
S2
HV1
PS4
PE1
M2
Symbol Name Function
PWB-A Printer PWB unit Communicates with the control PWB and controls all printer operation.
PWB-B Power Supply PWB unit Converts the power voltage from AC voltage into DC voltage and supplies that to H1.
PWB-D Laser Diode Drive PWB unit Detects the start position of the image by the laser diode and the SOS sensor.
(Inside of the Print Head Unit)
PWB-G Toner Empty PWB unit Toner quantity is read by the analog signal. (Use of LED)
M1 Printer Motor Is the drive source of the printer.
M2 Polygon Motor Rotates at high speed and makes the laser scan in scanning direction.
(Inside of the Print Head Unit)
M3 Fan Motor Exhausts the heated air out of the printer.
H1 Heater Lamp A halogen lamp that supplies heat to the fusing rollers.
HV1 High Voltage PWB unit Applies voltage respectively to the rotating charge brush, the sleeve roller, the toner
regulation plate, the toner collecting plate and the image transfer roller.
PE1 Paper Empty Sensor Detects the presence of paper. The signal is L when the paper is detected.
PS1 Paper Take-Up Sensor Switch Detects when the paper is picked up and the paper length. The signal is L when the paper is detected.
PS3 Paper Exit Sensor Detects when the paper is fed out. The signal is H when the paper is detected.
PS4 Paper Out Sensor Paper out detection signal. The signal L when the paper is detected.
PS5A Tray Cover Sensor The signal is L when there is a tray cover.
PS5B Paper Size Sensor Detects the size of the paper. Letter: signal L, Legal: signal H.
S2 Interlock Switch Detects the opening or closing of the upper unit.
SL1 Paper Take-Up Solenoid Transmits the drive of the printer motor to the paper take-up roller.
TH1 Thermistor Detects the temperature of the heat roller.
TS1 Thermostat Cuts off the current to the heater lamp (H1) when it detects overheating.