Canon EOS 7 Service Manual page 188

Part 4: Electrical Adjustment
ECF S
ENSOR
P :
URPOSE
This is for checking the ECF sensor unit. Select this item if the user complains about
Eye Control focusing problems.
Items to be checked:
• ECF sensor output
• IRED illumination position and output
• ECF sensor position
CAUTION
Many ECF problems are caused by a dirty eyepiece lens. Before executing
the above checks, clean the eyepiece lens.
• ECF sensor check (IREDs off)
P :
REPARATIONS
1) On the ECF Adjustment menu, select [F2] ECF Sensor Check (IREDs off).
C P
HECK ROCEDURE
1) After a few moments, the waveforms
as shown on the right will appear.
Cover the eyepiece or shine a light
source (about EV12) on it. The
waveforms should look even. If there
is an irregular peak or depression
somewhere, check for any smudges
on the eyepiece and do the ECF
sensor unit adjustment. After the
adjustment, check the waveforms
again. If nothing improves, the ECF
sensor is probably faulty.
U C
NIT HECK
:
NAC_C2
ECF check
IRED condition is normal if four posts
can be seen in each wavefrom.
Press RETURN to return to ECF adjustment menu
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