ASAHI PENTAX S3, Руководство по обслуживанию

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I N T RODU CT I ON
This Service Manual is prepared for servicing Product # 230 2; however, since the following products have
structures similar to 230 2. This Manual will also apply to these products:
Product # Model Description Major Difference
229-2 S1. H1. S2. H2 Semi-automatic diaphragm.
230 S3. H3 Old-type fully automatic diaphragm.
229-3 S1. H1. S2. SB. SB2
232 SV. H3v Self-timer, automatic re-setting film counter.
230-3 Sla. Hla, S2 Automatic re-setting film counter.
SUMMARY OF STRUCTURE AND PERFORMANCE
Upon cocking the rapid wind lever, the bounce stopper mechanism is first released, the shutter curtains are
wound, and the mirror actuator lever, bottom (B19) tensions the mirror seat spring (B44) and the dia lever
spring (B72).
When the shutter button is depressed, the bulb lever will be so positioned as to prevent rotation of the bottom
selector gear (E44) which is connected with the 2nd curtain, and at the same time will contact the high speed
cam (E85) which selects the high speed exposure timing. Further, the spill (E08) will come down, freeing the
top idling gear (E17l, thus making the exposure ready to be made.
When the shutter button is depressed by 1.2mm to 1.7mm, the 2nd dia lever (B54) will be released and will start
rotating rapidly, and the 1st dia lever (B53) which couples with the 2nd dia lever will press the automatic
diaphragm release pin.
During the rotation of the 2nd dia lever, the reflex mirror is released and starts flipping upward. While the
mirror is flipping up, the FP contact is switched in, and the curtain actuating lever is pressed up, starting the
travel of the 1st curtain.
At the instant the 1st curtain passes the picture format, the X contact is switched in, and the bounce stopper
functions and then stops.
The shutter exposure timing can be determined by turning the shutter speed dial. The shutter speed dial has a
slot to be coupled with the Asahi Pentax clip-on exposure meter. As the shutter speed dial is turned, the centre
slot of the high speed cam moves eccentrically, and added to the shape of the high speed cam, high speed
exposure timing is determined (from 1/30 to 1/1000 sec). Slow speed exposure timing (from 1 to 1/15 sec.) is
determined by the slow speed cam (F0l), which changes the operating time of the slow speed governor located
underneath the mirror housing, as the shutter speed dial is turned within the slow speed range.
With the shutter speed dial set at "B" the high speed cam floats, and since the top bulb lever (E06A) does not
contact the high speed cam, the 1st curtain starts travelling when the shutter button is depressed, however, the
2nd curtain stays without travel. The 2nd curtain will start travelling only after the shutter button is released.
With the shutter speed dial set at "T" the slow speed cam causes the time stopper (F03) to check the movement
of the slow speed actuator lever (F06), and contrary to the "B" position, the 2nd curtain will not start travelling
even after the shutter button is released, but will start its travel only after the shutter speed dial is turned either to
the direction of "B" or 1/1000.
Just prior to the completion of travel of the 2nd curtain, the pin of the coupler gear (E18) rotates the pinion
coupler lever (E10), and the bottom actuator lever spring (B47) causes the mirror actuator lever (B19) to return
to its original position. As the 1st and 2nd levers are also placed back to the original position, the automatic
diaphragm of the lens reopens again.
Actual time required from the start of the rotation of the 2nd diaphragm lever by depressing the shutter button to
the completion of all these performance is not more than 40 ms. Needless to say, in the case of slow speed
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