E. Controlling the Scanning Lamp
1. Outline
The scanning lamp is a fluorescent lamp and is controlled by the composite power supply PCB (Figure
3-206) for the following:
• Controlling the scanning lamp pre-heating
• Turning ON/OFF the scanning lamp
• Controlling the intensity of the scanning lamp
Figure 3-206
Scanning
lamp ON
circuit
Scanning
lamp
pre-heat
circuit
T101
T501
FLPWM
MPCLK
FLPRTH
Q605
CPU
Composite power supply PCB
Scanning lamp
(fluorescent lamp)
DC controller PCB
Gate array
CPU
IC 102
IC101
T101
Drive
circuit
T101 Drive signal
Scanning lamp
intensity sensor
FLS
Logic circuit
FLON
FLOFF
PRTCT
COPYRIGHT © 1996 CANON INC. CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3–24
3. OPERATIONS AND TIMING