Xerox WORKCENTRE PE 220, Service Manual

Page: 135 / 192

General Procedures and Information
Workcentre PE 220 11/05 6-27
Fuser AC Power Control
The Fuser (HEAT LAMP) gets heat from AC power. The AC power controls the switch with the
Triac, a semiconductor switch. The 'ON/OFF control' is operated when the gate of the Triac is
turned on/off by Phototriac. In other words, the AC control part is a passive circuit, so it turns the
heater on/off with taking signal from engine control part.
When the 'HEATERON' signal is turned on at engine, the LED of PC102 (Photo Triac) takes the
voltage and flashes. From the flashing light, the Triac part (light receiving part) takes the voltage
and the voltage is supplied to the gate of Triac and flows into the Triac. As a result, the AC current
flows in the heat lamp, and heat is occurred.
On the other hand, when the signal is off, the PC102 is off, the voltage is cut off at the gate of
Triac, the Triac becomes off, and then the heat lamp is turned off.
1) Triac feature: 12A, 600V SWITCHING
2) Phototriac Coupler (PC102)
- Turn OnIf Current: 15mA~50mA(Design: 16mA)
- High Repetitive Peak Off State Voltage: Min 600V