Canon EOS DIGITAL REBEL XTI Service Manual page 142

Adjustments
3) When replacing both the Mirror Box Ass'y and CMOS sensor ass'y
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1
Mirror box ass'y service parts are factory-adjusted to standard size
1
(42.930mm), and the correction is marked on the parts. Therefore, the
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mirror boxes are adjusted to 42.930mm, and the offset correction is
marked on the CMOS sensor unit. Follow the procedures in Adjustment
Procedure 1).
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(1) Measuring the CMOS sensor position
Measure the distance from the mount surface to the
following three points.
Ex.) P1: 42.074mm
P2: 42.455mm
P3: 42.756mm
(2) Offset washer determination (Standard distance:
42.930mm)
The difference between the standard distance and the
measured distance for each point ( 1) is the washer
thickness required at that point. (Do not bond washers
in place.)
P1: 42.930- 42.074 = 0.856
P2: 42.930- 42.455 = 0.475
P3: 42.930- 42.756 = 0.174
(3) CMOS sensor ass'y Offset
The CMOS sensor ass'y is marked with the offset values
(difference from 43.20mm) for each point. When
installing the CMOS sensor, use the indicated washers,
but do not bond the washers in place.
Ex.) P 1 (upper right) : 0.02
P2 (lower right) : 0.05
P3: (left) : - 0.069
Fig. 007
Fig. 008
( 4) Tighten the three CMOS sensor ass'y screws uniformly.
CB2-0682-000 (XXX)
Detail
= =1A(XXX)
A
0.03mm
0.05mm
0.08mm
0.10mm
0.12mm
0.15mm
0.18mm
0.20mm
Fig. 009
7
SIZE
(003)
(005)
(008)
{010)
{012)
{015)
{018)
(020)