Canon CLC5100 Series, Manual

Page: 69 / 290

Chapter 2
2-17
F-2-33
C/M Laser Unitm
ޓ
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.
ޓ
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 diode may become damaged.
2.4.5 Adjusting the Laser
Intensity
0002-5885
CLC5100 / CLC4000
Be sure to adjust the laser power before making the
following adjustments
ޓ
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:
ޓ
T-2-1
ޓ
5) Execute 'FUNC > 6 LASER > 800P00'
6) Turn VR3 counterclockwise so that the reading of
the Digital Multimeter is the P00 target value.
7) Press the Stop key to stop the laser output.
8) Execute 'FUNC > 6 LASER > 800PFF'
9) Turn VR4 counterclockwise so that the reading of
the Digital Multimeter is the PFF target value.
10) Press the Stop key to stop the laser output.
11) Likewise, adjust the following volumes:
Execute the following in service mode, and use
VR5:'FUNCTION>LASER>400P00'
Execute the following in service mode, and
use6:'FUNCTION>LASER>400PFF'
VR1 VR3 VR5 VR7
VR2 VR4 VR6 VR8
Formula Results
P00 target:BIAS + 0.1 =
PFF target:
266/200/400lines(60.0
BIAS)× 0.7 + BIAS =
800lines(60.0BIAS)×
0.57 + BIAS =