Technical information

2-6
CHAPTER 2 NEW FUNCTIONS
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON CLC5000 REV.0 JAN. 2001
1.5 Controlling the Intensity of the Scanning Lamp
1.5.1 Outline
The machine’s scanning lamp is a halogen lamp.
The following figure shows the circuit used to control the intensity of the scanning lamp,
and the circuit has the following functions:
1. Turning on and off the scanning lamp
2. Detecting the activation of the scanning lamp
3. Controlling the intensity of the scanning lamp
• The intensity of the scanning lamp is controlled to a specific level even when the volt-
age of the power supply fluctuates.
F02-105-01
1.5.2 Operations
1. Turning On and Off the Scanning Lamp
When LAON is ‘0’, the lamp regulator drive circuit is off, and the intensity connector
circuit is also off, consequently keeping the scanning lamp (LA1) off.
When LAON is ‘1’, on the other hand, the lamp regulator drive circuit goes on to turn
on the intensity control circuit, consequently turning on the scanning lamp (LA1).
B4
B1
B2
B7
B5 6
4
9
10
7
1
4
3
1
J9
J450
FU1
24V
24V
+
-
J1306
LAERR
LAON
LACNTL
LAON-S*
TIM-RST
PWM
Reader controller PCB
AC
power
supply
Rectification
circuit
Switching
circuit
Scanner
thermal
switch 1
(TP4)
Scanner
thermal
switch 2
(TP5)
Scanning lamp
(LA1)
Lamp
regulator
drive
circuit
Intensity control circuit
Lamp ON
detection
circuit
Error
latching
circuit
Timer
circuit
ON detection signal
Lamp regulator