Nikon D50 Repair Manual page 47

Angle adjustment of Main mirror and sub-mirror
*Tools required:
1.Main mirror 45°Inspection and Adjustment
① Collimator (J19002)
② Reflection mirror (J18362）
③ Optical parallel (J18037）
④ Hexagonal wrench
J18037
J18362
* Standard:
Main mirror
Left-right
±30' or less
deviation
Up-down
±10'
deviation
8'or less
Distortion
* Note:
・ Before and after the adjustment, check the accuracy by moving the main mirror up- and downwards a few
times.
・ Check for the up-down deviation. In case the deviation is out of standard, make an adjustment by turning the
eccentric pin with Hexagonal wrench.
・ In case the deviations of up-down and left-right are out of standard, the front plate unit or mirror unit is
regarded as malfunctioning.
・ In case of checking or adjusting only the front body, check again after assembling the front body into the rear
body.
Collimator
Bayonet
Eccentric pin for
the main mirror
Main mirror
Sub-mirror
＿＿
+15' ～ -50'
8'or less
- Ａ12 ･
2. Sub-mirror 47.75° Inspection and Adjustment
① Collimator (J19002)
② Sub-Mirror 45 deg. inspection tool
（J18324）
③ Hexagonal wrench
J18324
Eccentric pin
for the sub-
mirror
Up-down
Reference
line
-
VBA12001-R.3668.A
Collimator
Bayonet
Sub-mirror
Width of line indicates
deviation.
Left-right