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3. Fuser Lamp Drive Circuit
It consists of 1 Fuser Lamps and Fuser Lamp is controlled by two HTC PC Boards.
The Fuser Lamp is powered by 100 VAC. When the CN7, Pin 4 (HTCNT) on the LVPS PCB goes
LOW, the Fuser Lamp turns ON. This lights up the PC5 LED and activates the TR1 photo-triac, and
100 VAC is sent to the Fuser Lamp.
to CPU
Board
Board
CN7
TR1
5V
4
PC5
AC1
L4
AC2
1
2
to Fuser Lamp
CN3
4. Interlock Safety Circuit
This safety circuit turns OFF the +24 VDC and +5 VDC supply voltages when the Printer Cover is
opened. When the Printer Cover is opened, the microswitch(es) on the LVPS Board are de-actu-
ated, turning OFF +24 VDC to the Printer Motor Drive Circuit, the HVPS, the Paper Feed Solenoid
Circuits, the Clutch Drive Circuit, and the Laser Driver Circuit on the Laser Unit.
LVPS
SW2
to CPU PC board
to CPU PC board
CN5
1
24V
5V
CN6
1
SW3
SW4
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