Canon 1000 Service Manual page 474

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
6) Insert the lead wire of the laser power checker
into the Digital Multimeter, and set it to the 200
mV range.
7) Start service mode, and execute 'POWER' and
'1/2 POWER' of '#6 LASER' under 'FUNC'.
8) Check to make sure that the reading of the Dig-
ital Multimeter is 'POWER: 44.8 ±0.4 mV, 1/2
POWER: 20.0 ±0.2 mV'. If the readings are not
as specified, make the following adjustments:
Making Adjustments
1) Turn the volumes VR1 through VR8 on the la-
ser unit fully clockwise. (Do not turn VR9.)
VR8
VR6 VR4 VR2
VR5 VR3
VR9*
VR7
(*for factory)
Figure 7-274 C/Bk Laser Unit
7-38
COPYRIGHT © 2001 CANON INC.
VR1
Figure 7-275 Y/M Laser Unit
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.
• When turning the VR, turn it slowly
• Turning the VR clockwise de-
• Do not exceed the setting recorded
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
VR2 VR4 VR6 VR8
VR1 VR3 VR5 VR7 VR9*
while referring to the reading of the
Digital Multimeter; do not increase
the power excessively.
creases the laser output.
on the label; otherwise, the laser
diode may become damaged.
(*for factory)