Controlling The Temperature Of The Laser Unit - Canon CLC 1120 Service Manual

4. APCHOLD (auto output control signal)
Serves as a control signal used to stabilize the output of the laser.
5. L-ON (laser activation signal)
Serves to turn on the laser at full intensity; it is '1' (laser on) only during laser power
adjustment or during beam detection.
6. L-RDY (laser emission ready signal)
Serves to indicate the state of the laser; it is '0' when the laser is on, and is '1' when the laser
is off.
For VR2, see the instructions on how to adjust laser power under II.B.2 "Adjusting Laser
Power" in Chapter 13.
Reference:
When printing a test pattern in service mode, the output command from the CPU PCB causes
the laser controller PCB to form the appropriate test pattern for output.
B. Controlling the Temperature of the Laser Unit
The temperature of the laser unit is controlled to ensure a stable laser intensity.
A thermistor and a heater are mounted inside the laser unit so as to control the temperature to a
specific level.
COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 5 LASER EXPOSURE SYSTEM
5-5