Mechanical Adjustments - Canon EOS DIGITAL REBEL XTI Service Manual

Adjustments
2. MECHANICAL ADJUSTMENTS
2.1 Flange to Focal Plane Distance (FFD) Adjustment
• The adjustment procedure is same as that of EOS-1 D series
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• FFD adjustment is required when replacing the mirror box ass'y or the
CMOS sensor ass'y.
• It is also required when images blurred on one side occur due to some impact.
(Purpose)
The FFD is the distance between the lens mount reference plane and the CMOS sensor
plane. It cannot be measured directly by service; therefore, measure the distance from the
mount plane to CMOS mounting washer plane (washer included) to adjust the FFD.
(Service Parts)
Mirror box ass'y: Compensation washers are not attached as before.
CMOS sensor ass'y: Offset values based on the specification are written.
(Specifications)
Mirror box ass'y replacement Set the distance from the lens mount to the CMOS sensor
installation surface to same distance as before mirror box ass'y
replacement.
CMOS sensor ass'y: Add or subtract the CMOS sensor ass'y compensation amount to/ from
the difference calculated by subtracting the original distance between the
lens mount and the CMOS installation surface (washer included) from the
specified distance. Select the washer that meets calculated value to bring
the FFD within the specification.
Reference (FFD): The dimension from the lens mount surface to the imaging surface i.e. the
FFD (Flange to focal plane distance) is 44.00
±
0.02mm.
(Tools)
• Digital micrometer CY9-7124-000 • Stand CY9-7124-00 1
• Measuring terminal CY9-7124-002 • Mount Fastening Tool CY9-1 54 7-000
(Preparation)
• Place the mount fastening block on the digital micrometer, and place the measuring tip on
the mount reference plane. Reset the meter to "0".
Micrometer
124-000
CY9-7124-'21,.. - - - -
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Fig. 003 Set
up
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