Canon EOS DIGITAL REBEL XTI Service Manual page 140

Adjustments
(Adjustment Proced ure)
1) When replacing CMOS sensor ass'y {Using the original mirror box)
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Service parts are set to 42.930mm at the factory, and their image units
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: are adjusted. Each offset data is attached to the parts. Therefore, based :
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on the 42.930mm standard, the offset needs to be added or subtracted to
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calculate the final distance. Then, finally select washer that meet calculated
distance.
(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:
42.93mm)
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.)
Pl: 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 43.30mm) for each point.
When installing the CMOS sensor, use the indicated
washers, but do not bond the washers in place.
Ex.) P1 (upperright) :0.856+ 0.02 = 0.876
P2 (lower right) : 0.475 + 0.05 = 0.525
P3 (left) : 0.174 - 0.069 = 0.105
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Fig. 004
Fig. 005