Canon PC950 Service Manual - Page 59
II. EXPOSURE SYSTEM, Controlling the Scanning Lamp
UPC - 030275182316
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CHAPTER 3 EXPOSURE SYSTEM II. EXPOSURE SYSTEM A. Controlling the Scanning Lamp 1. Outline Figure 3-201 shows the circuit used to control the scanning lamp, and has the following func- tions: • Turning on/off the scanning lamp. • Controlling the intensity of the scanning lamp. • Monitoring the state (on/off) of the scanning lamp. (Q101) Intensity adjustment (Q900) signal Serial communication PWM_1KHz Lamp activation signal LAMP_ON 9 + 4- Phase 2 + - control circuit 7 Rectifying circuit (HIC001) Arcing circuit Thermal fuse (FU1) Scanning lamp (LA1) Microprocessor Microprocessor VR107 DC controller PCB Activation detection signal LAMP_DETECT Rectifying circuit Activation detection circuit Composite power supply PCB Figure 3-201 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-9