When Replacing Mirror Box Ass'y (Using The Original Img Unit); When Replacing Both The Mirror Box Ass'y And Img Ass'y - Canon EOS 5D Service Manual

2) When replacing Mirror Box Ass y (Using the original IMG Unit )
If the washer offsets for the IMG unit are unknown, select washer offsets
and insert the washer to make the distance the same as the approximate
CAUTION
distance from the lens mount surface to image sensor installation surface
(washer included) on the camera that was replaced.
（1） Before replacing the Mirror Box Ass y, remove the IMG unit, and measure the existing
dimension from the lens mount surface to the image sensor installation surface (including
the washer) (three points).
（2） After replacing the Mirror Box Ass y, measure the distance from the mount surface to the
image sensor installation surface (three points). Select and attach washers to make the
distance the same as before replacement.
Example: When the existing measured value (lens mount surface to the image sensor
installation surface) is 46.8mm, a 0.1mm washer is attached, and the measured
value after replacement is 46.9. As the measured value after replacement is 46.9
(46.8 + 0.1 = 46.9), washers are not necessary.

3) When replacing both the Mirror Box Ass'y and IMG Ass'y

Mirror Box Ass y service parts are pre-adjusted to 47.2mm with the front
panel gage. Offset values are marked on the parts, so only the IMG unit
CAUTION
correction for a Mirror Box of 47.2mm is necessary.
（1） Ex: Offset values of the replacement parts
Upper Right: 0.069
Bottom Left: 0.02
Bottom Right: 0.051
（2） Measure the distance between the lens mount plane
and the flange-back washer planes.
Upper Right: 42.97mm (46.97mm)
Bottom Left: 42.96mm (46.96mm)
Bottom Right: 42.93mm (46.93mm)
（3） Calculate the washer offset values.
Upper Right: 47.2 0.069 46.97=0.16mm
Bottom Left: 47.2+0.020 46.96=0.26mm
Bottom Right: 47.2+0.051 46.93=0.32mm
（4） Attach the washer. (Do not glue)
6
Adjustments
Fig. 007
Fig. 008