Af Sensor Positioning (Horizontal) - Canon EOS 55 Service Manual

Part 3: Repair Information
3.2 AF
SENSOR POSITIONING (HORIZONTAL)
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The AF sensor position must be adjusted when the AF sensor unit is
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replaced. Adjustment is basically similar to the previous EOS cameras.
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PuRPosE:
To align the center position of the AF sensor with the optical axis. (Horizontal
adjustment only.)
STANDARD
The center of the sensor must be inside the central AF frame.
AF Frame
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BASIS
Fig. 3-37 AF Frame and BASIS Alignment
TOOLS:
EF50mm
f
I
1.8 (product) Pen light or illuminator
PREPARATIONS
1. Use the body of the EOS camera to stop down the EF50mm
f /
1.8 lens to
f
/8.
• When EOS 1000 is used, mount an EF50mm
f /
1.8 and set AV mode and
the aperture to f/8. Shade the lens to cause a long shutter speed. Press the
shutter button and remove the lens while the shutter is open. Remove the
lens while holding SW2 on.(For other camera types, refer to earlier Service
Manuals.)
2. Set the distance scale of the lens to
infinity(to make the AF frame
clear).
ADJuSTMENT:
1. Install EF50mm
f
I
1.8 to the front
. panel with the mirror unit, focus-
ing screen, and the main flex with
the AF sensor unit installed tem-
porarily
2. Illuminating the AF sensor unit
with a penlight, look in the lens
and check the AF frame and a
BASIS image as shown below.
3. Move the AF sensor unit vertically
to adjust the position of the sensor
to the center of the AF frame.
4. Slightly tighten the screws in the
AF sensor unit and apply Three
Bond 1401 B to the head of the
screws.
3-29
AF Sensor Unit
i
~
Stake with Three
Bond 14018
Light (or llluminator D)
Fig. 3-38 AF Sensor Positioning