Af Accuracy Adjustment - Canon EOS 55 Service Manual

Part 3: Repair Information
4.9
AF ACCURACY ADJUSTMENT
AF Accuracy adjustment must always be made when replacing the AF unit.
AF Accuracy adjustment is necessary if it is impossible to store or transfer camera data
before replacing the main flex.Otherwise, this adjustment is unnecessary.
PlrRPoSE:
AGC adjustment:
DARK adjustment:
Shading adjustment:
Adjusting the gain to insure that the BASIS output
waveform is sufficient but does not saturate.
Correcting minute electric current that BASIS (AF sen-
sor ) will generate even in the absence of light (dark cur-
rent).
Compensates for bit-by-bit variations in the sensor out-
put.
"l@•jjMH
AF Accuracy adjustment must always be preceded by AF sensor position-
1
ing. There must also be no dirt adhering to the main mirror, sub mirror,
!
----------------------------~!:_!!~~!-~~~-~!~-' 2 ~-~!:~!!~~-~~-
the AF
-~~~~~~:_
__________________________________________________________
j
TOOLS:
Personal computer RS-232C cable HS-I/F
Adjustment software (stored on a work disk)
EF-8000 EF50mm f/18 production lens
Light Tripod Dark bag
Charts: The EOS5 AGC chart is used
PREPARATION:
1)
Set the camera and AGC Chart as indicated.
2) Start adjustment program, connect the camera to the computer through the HS-
I/F, and select (F3) AF Menu screen.
Fig. 3-52 AGC Adjustment
3-50