Pentax 77420 - Page 22

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③ B11 --- Hook the spring to shaft of mirror seat.
[CAUTION] Caution for come off spring.
④ B19
⑤ B70 --- Push up 1
st
mirror then
Surely install B70 as shown in figure.
5. [Adjustment] Positioning 1
st
and 2
nd
mirror
[Required equipment] 1
st
mirror angle (45°) adjustment tool,
Mirror angle adjusting for 27830 (need modify), Mirror positioning scope.
* Adjustment is performed by turning B70 and B58 (1 pcs). The Y-axis (the vertical direction) is
adjusted to a 0 target.
* Front housing must set mirror down position.
① Position 1
st
mirror : Put the 1
st
mirror angle (45°) adjusting tool on the camera, and then adjust the mirror
seat so that the adjusting tool touches the mirror without gap.
Tolerance --- X-axis: ±10’
許容範囲･･ Y-axis: ±10’
②Positioning 2
nd
mirror : Attach the mirror positioning scope
and the 2
nd
mirror angle adjusting tool to the camera, and then
adjust the mirror angle while looking through the eyepiece lens.
Tolerance --- X-axis: ±0.3mm
許容範囲･･ ･Y-axis: ±0.1mm
(Refer to below tolerance for positioning scope)
■ Tolerance for 2
nd
mirror position
(Using with the mirror positioning scope)
③

④

⑤

1mm hole
OK OK NG NG
(Standard)

Scale
Center of Standard
1
2
-
2
-
1
2
1
-
1
-
2
1
2
-
2 -
1
2
1
-
1
-
2
NG: 0.8(X)
or over.
0.6 (Y) or over
：Tolerance of 1mm hole
(
X
-
axis = ±0.8, Y
-
axis=±0.6
)
B58
2nd mirror
1st mirror
B70