Repair Manual, Parts List, Diagrams and Assembling Charts

23102 Page 30
e. BONDING OF ADJUSTING PARTS
After adjustment of the high and slow speed exposure timing, bond the undermentioned parts with red lacquer
to prevent possible loosening by vibration, etc.
High speed lever adjust nuts (05111) 2
Bounce stopper adjust screw (05109) 1
Set screw (Set T1.4 x 2) for curtain shaft rest 2
f. INCONSISTENCY OF EXPOSURE TIMING
If the exposure timing at the same speed setting differs after each shutter release, it is referred to as
“inconsistency of exposure timing.”
Strictly speaking, it is extremely difficult to maintain consistently correct exposure timing. Major causes for
inconsistency may be traced to the following:
(1) When the top intermediate gear (05033) is oiled or stained.
(2) When the hole of the high speed cam (05219 or 05319) is dusted, or not properly oiled, or stained with
grease.
(3) When the 1st and/or 2nd curtain pinion shaft (05061) (05062), top mec. plate (03001) and/or shaft
receptacle of the bottom shaft rest (05003) are not properly oiled.
g. ADJUSTMENT OF EXPOSURE TIMING AT VARIOUS POSITIONS ON PICTURE FORMAT
In a camera with focal plane shutter, the slit formed by its shutter curtains travels right in front of the picture
format, thereby exposing the film successively. Therefore, it becomes necessary to measure the time of
exposure at various positions of the picture format.
In this camera, the above measurement should be made at 1/1000 sec. If the travel time of the shutter curtains
at 1/1000 sec. is consistent and time of exposure at various positions within the picture format is likewise
satisfactory, it follows that exposure timing at the slower speeds is automatically within tolerance.
A digital computer type shutter speed tester indicates the time of exposure at three positions; at the start, centre
and end of the picture format.
In view of the characteristics of this camera, it is desirable to adjust the exposure timing at the start of the
picture format slightly faster than at the centre, and the timing at the end as fast as or slightly slower than at the
centre.
By carefully comparing the exposure timing at the three measuring positions as indicated by the shutter speed
tester, determine whether the curtain travel speed or the high speed lever (05005) should be adjusted. The
exposure time at the start is adjusted mainly with (05005), while that at the end by adjusting the curtain travel
speed. However, since either adjustment will change the exposure time at the three different positions,
compare the exposure at the start and end, and repeat this adjustment until satisfactory results are obtained. An
example of this is shown in Diagram 42.