Adjusting The Laser Intensity - Canon CLC5000 Service Manual

2) Start service mode, and execute '1/2 POWER' of 'LASER' under 'FUNC'.
3) Turn VR1 counterclockwise so that the reading of the Digital Multimeter is '20.0 ±0.2
mV'. (Take care not to turn too fast; the reading will increase abruptly at a certain
point.)
4) Press the Stop key to stop the laser output.
5) Execute 'POWER' of '6 LASER' under 'FUNC'.
6) Turn VR2 counterclockwise so that the reading of the Digital Multimeter is '44.8 ±0.4
mV'. (Take care not to turn too fast; the reading will increase abruptly at a certain
point.)
7) Take notes of the reading of 'POWER' after adjustment.
8) Press the Stop key to stop the laser output.
9) Perform laser intensity adjustment.
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2.8.5 Adjusting the Laser Intensity

Be sure to adjust the laser power before making the following adjustments:
1) Start service mode, and execute 'FUNC > 6 LASER > BIAS'.
2) Take notes of the reading of the Digital Multimeter.
3) Press the Stop key to stop the laser output.
4) Compute the target value according to the following formula:
P00 target:
(POWER–BIAS) 0.008+BIAS=
PFF target:
(POWER–BIAS) 0.9+BIAS=
5) Execute 'FUNC > 6 LASER > 800-P00'
6) Turn VR3 counterclockwise so that the reading of the Digital Multimeter is the P00 tar-
get value.
7) Press the Stop key to stop the laser output.
8) Execute 'FUNC > 6 LASER > 800-PFF'
9) Turn VR4 counterclockwise so that the reading of the Digital Multimeter is the PFF tar-
get value.
10) Press the Stop key to stop the laser output.
COPYRIGHT © 2001 CANON INC.
CHAPTER 5 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
When turning the VR, turn it slowly while referring to the reading of
the Digital Multimeter; do not increase the power excessively.
Turning the VR clockwise decreases the laser output.
Do not exceed the setting recorded on the label; otherwise, the laser di-
ode may become damaged.
Formula
2000 2000 2000 2000
Results
T05-208-01
CANON CLC5000 REV.0 JAN. 2001
5-49