Af Sensor Dust Check - Canon EOS 7 Service Manual

1.13 AF S D
ENSOR
P :
URPOSE
To check the AF sensor output waveform (image data output).This waveform can show
if there is any dirt in the AF sensor light path.
T :
OOLS
EF-8000/5000
C P :
HECK ROCEDURE
1) Position the camera at the light source with a lens mounted to it. Set the brightness
of the light source to LV12. (Be sure to shield the eyepiece from external light.)
C
UST HECK
Light
source
Fig. 4-12 AF Sensor Dust Check
4-25
Part 4: Electrical Adjustment
Shield from light.