Controlling The Scanner Lamp; Outline - Canon NP6330 Service Manual

C. Controlling the Scanner Lamp

1. Outline

Figure 4-103 shows the circuit used to control the intensity of the scanning lamp, and
the circuit has the following functions:
Turning on and off the scanning lamp.
Detecting the activation of the scanning lamp.
J117
-2A
J103
IC115
-12A
-10A
D/A
converter
IC104
±24VA
-8A
IC109
Q147
-11A
±24VA
-7A
-9A
DC controller PCB
COPYRIGHT © 1997 CANON INC.
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J603
-1
LDT
Differential
amplifier circuit
LINT
-3
Switching
LMPON
-5
circuit
ZRCS -2
-6
-4
Figure 4-103
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
PWOFF
*
Power supply voltage
fluctuation detection circuit
Phase
control
Arc
circuit
Lamp regulator (CVR)
Power
switch
(SW1)
Power supply
FU1
Zero-cross
Scanning
detection
lamp
circuit
(LA1)
4-3