Adjusting The Laser Intensity - Canon 1000 Service Manual

5

Adjusting the Laser Intensity

Be sure to adjust the laser power be-
fore making the following adjust-
ments:
1) Start service mode, and execute 'BIAS' of '#6
LASER' under 'FUNC'.
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 fol-
lowing formula:
Formula
P00 target:
(POWER–BIAS)×0.008+BIAS=
PFF target:
(POWER–BIAS)×0.9+BIAS=
Table 7-202
5) Execute '400-P00' of '#6 LASER ' under
'FUNC'.
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 '400-PFF' of '#6 LASER' under
'FUNC'.
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) Adjust the volumes according to the type of la-
ser unit as follows:
For Y, adjust VR7 and VR8 using '266-P00'
and then '266-PFF'.
For M/C, adjust VR5 and VR6 using '200-P00'
and then '200-PFF'.
For Bk, adjust VR5 through VR8 using '200-
P00', '200-PFF', '266-P00', and then '266-
PFF'.
Item 400_P00 400_PFF 200_P00 200_PFF 266_P00 266_PFF
VR VR3 VR4
Table 7-203
COPYRIGHT © 2001 CANON INC.
Results
VR5 VR6 VR7 VR8
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
12) Press the Reset key to end service mode.
13) Turn off the power switch.
14) Remove the laser power checker, and install
the inlet cover.
7-39