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=
15
MAGNET
CORE
(D75 )
When
installing Magnet
core
(D75), clearance
adjustment
is re-
quired.
The
clearance
stabilizes
the actuator
sustaining force
of
the electromagnet.
A
Adjustment
After the shutter mechanism
is cocked
(or Re-set hook
is en-
gaged), press the core lightly toward the armature
with a finger,
placing
Thickness guage(234J-04012-A) between the armature and
the core ends, and hold it.
Then fix the core with the screw( SNS
1.7x3
).
However,
optimum
clearance
varies
case by case.
Refer to Fig. 4-35,
234J-04012-A
( Shuttez, cocked )
Pig.4-35
ae
;
SNS 1.7x3
B
Attractive force check
When
the shutter
operates
at ''B'' of the shutter dial,
the electro-
magnet must hold the armature
until the source
voltage
drops to
4.9V.
If the electromagnet
does not hold it at 4.9V, check the attrac-
tive force.
Procedures are as follows:
After
cocking the shutter, push the release
plate, holding the
mirror actuator disk(D17) with your finger . Stop the rotat-
ion of the disk before
the disk actuates
the timing checker
lever.
Hold Shutter actuator lever(D52) in "power-SW-ON'"'
position.
Then lift the armature from the core ends ,as
shown in Fig. 4-36.
When the armature
leaves the both core
ends at the
same
time, the strongest attractive force is obtained.
Armature
"power SW-
re
ON
"
D52
Cores
Fig.4-36
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