Fresa G024, Руководство по обслуживанию

Страница: 27 / 178

31 March, 1999 ELECTRICAL COMPONENT LIST
1-23
Overall
Information
1.6.7 CIRCUIT BOARDS AND POWER SUPPLIES
Symbol Name Function Diag. No.
PCB1 Power supply
unit (PSU) Supplies low-voltage power (5 VDC and 24
VDC) and ac power to the fusing unit.
1
PCB8 Controller board Houses the controller, host interface,
engine interface, and image generator.
2
PCB3 High voltage
supply board Supplies high voltages for charge,
development, and transfer.
3
S9 Temperature/hu
midity sensor Detects temperature and humidity.
4
PCB2 Main control unit
(MCU) Houses the controller interface and engine
controller.
5
PCB4 Laser
synchronization
detector board Detects the laser main scan
synchronization beam from the polygon
mirror.
6
L3 Quenching lamp Quenches the OPC by exposing it to light. 7
PCB6 By-pass paper
width detection
board Detects the paper width in the by-pass
feeder.
8
PCB5 Laser diode (LD)
unit Controls laser beam output.
9
PCB7 Operation panel Displays information and allows access to
functions.
10
1.6.8 THERMISTORS
Symbol Name Function Diag. No.
TH1
Pressure roller
thermistor Detects the pressure roller temperature.
1
TH2
Hot roller
thermistor Detects the hot roller temperature.
4
1.6.9 FUSES
Symbol Name Function Diag. No.
TF2
Pressure roller
thermofuse Provides protection against abnormal
heating (250 VAC, 10 A, 167
°
C).
6
TF1
Hot roller
thermofuse Provides protection against abnormal
heating (250 VAC, 10 A, 167
°
C).
3
1.6.10 LAMPS
Symbol Name Function Diag. No.
L2
Pressure roller
lamp Heats the pressure roller (120/230 VAC,
400 W)
2
L1 Hot roller lamp Heats the hot roller (120/230 VAC, 600 W) 5