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.
CN3
5V1
AC1
to Fuser Lamp
CN7
2
to CPU
Board
L4
4PC5AC2
TR1
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.
SW2CN5
LVPS
1
24V
to CPU PC board
SW3SW4CN6
1
5V
to CPU PC board
19 |