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PRODUCT NO.230-2
ASAHI PENTAX S3
SERVICE MANUAL
230-2 -1-
TABLE OF CONTENTS
Page
INTRODUCTION..................................................................................................................... 4
SUMMARY OF STRUCTURE AND PERFORMANCE ......................................................... 4
CHAPTER I. DISASSEMBLY.......................................................................................... 8
1. Disassembly of Cover Plates, Rapid Wind Lever and Rewind knob..................................... 8
a. Rapid Wind Lever (C03)
b. Shutter Speed Dial (E23)
c. Rewind Knob (D06)
d. Top Cover Plate (A03)
e. Front Cover Plate (A05)
f. Bottom Cover (A04)
2. Disassembly of Mirror Housing and Optical Parts .............................................. 9
a. Prism Seat (B01)
b. Mirror Housing (B02)
c. Mirror (AF12)
3. Disassembly of Top Transport Mechanism......................................................... 10
a. Wind-Up Lever Seat (C35)
b. Lever Stopper (C10)
c. Top 1st Gear (C20)
d. Wind-Up Lever Shaft (C34)
4. Disassembly of Bottom Transport Mechanism .................................................. 11
a. Bounce Stopper Actuator I Lever (E98)
b. Coupler Lever (C15)
c. "R" Lever Parts (C70)
d. Pin Adjust Plate (C17)
e. Wind-Up Shaft Parts
f. Sprocket Shaft (C30)
5. Disassembly of Shutter Mechanism ..................................................................... 12
a. Shutter Gear Mechanism
b. Shutter Curtain Parts
6. Disassembly of Mirror Housing Mechanism ........................................................ 16
CHAPTER II. ASSEMBLY AND ADJUSTMENT ........................................................ 18
1. Assembly and Adjustment of Shutter and Transport Mechanism......................................... 19
a. Shutter Curtain Parts
b. Stopper (C1I)
c. Idling Gear Parts
d. Wind-Up Lever Seat (C35) and Top 1st Gear (C20)
e. Bounce Stopper Mechanism
f. Pinion Coupler Lever (E10) and Coupler Lever (C15)
2. Adjustment of Shutter Exposure Timing.................................................................. 29
a. Curtain Speed
b. High Speed Exposure Timing
e. Irregularity of Exposure Timing
d. Slow Speed Exposure Timing
e. Time Exposure
f. Exposure Timing at Various Points on the Picture
3. Assembly and Adjustment of Exposure Counter ................................................... 34
4. Adjustment of X Contact ...................................................................................... 36
5. Adjustment of FP Contact..................................................................................... 37
6. Adjustment of Mechanical Back............................................................................ 37
7. Adjustment of Viewfinder Focus........................................................................... 38
CHAPTER III. FINAL TESTS....................................................................................... 40
CHAPTER IV. CAUSES OF DEFECTS AND SERVICING.......................................... 44
ATTACHMENTS
List of Special Service Tools
List of Lube Oils
List of Bonds Exploded Illustrations
List of Service Parts
List of Standard Parts
230-2 -2-
INTRODUCTION
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
230-2 -3-
exposure timing, the time required will be that much prolonged.
For facilitating better understanding of this Manual as well as for convenience of the reader when making
requisition for interchangeable parts and/or tools, lists and diagrams are attached herewith as Attachments.
Explanations with respect to disassembly are given in the order of work to be performed, while those pertaining
to assembly are described in the order opposite to the work of disassembly. No explanation is offered
concerning easily understandable disassembly and, or assembly. In case of a partial disassembly or assembly,
proceed with it on the basis of information contained in this Manual, making reference to such explanations as
may be considered pertinent to such need.
Classification of Part Numbers:
Service part numbers are given always starting with 01, according to each mechanism, and mechanisms are
classified in an alphabetical order as follows:
A Cover Plates, Back-Cover
B Mirror Housing, Prism Seat
C Film Winding Mechanism
D Film Rewinding Mechanism
K Shutter Mechanism
F Shutter Slow-Speed Mechanism
G Slow Speed Governor
AF Optical Parts
Standard Parts:
Service parts commonly used for all our products are called "Standard Parts" and the classification is as follows:
W Washer (except for those with special shape)
LW Lock Washer
R Rivets (except for those unavailable on the market)
Small Screws (except for those other than the standard dimensions)
Of the above, index numbers alone are quoted in the Manual to indicate standard small screws for the sake of
brevity. However, the index numbers shown are those applicable only to this Manual for 230-2, and should
therefore never be quoted, say, when making requisition for service parts or in technical communication.
Attachment 5 -- List of Service Parts -- may be modified or revised when alterations or improvement in some of
the listed items are deemed necessary, or when assembled parts are altered for various other reasons.
Please note, however, when such alterations or modifications are initiated, a new complete List of Service Paris
or a notice thereof will be mailed to you.
230-2 -4-
CHAPTER I. DISASSEMBLY
NOTE: As red lacquered spots are the spots securely fixed after making necessary technical adjustment,
do not unscrew such spots unnecessarily. When removing springs, care must be exercised so as not to
give any deformation to the springs; also refrain from taking out springs with bare fingers.
1. Disassembly of Cover Plates, Rapid Wind Lever and Rewind Knob.
a. RAPID WIND LEVER (C03)
Take out the arrow ring retainer screw (C54). When the counter screw (C36) is removed, using special
tool No. 225K-C36-A, the counter (C12) and counter spring (C60) can be taken out.
When the actuator lug screw (C53) for the advance lug actuator (C07) is taken out, 2 screws (C73) for
(C03) can be removed. As (C03) is securely fixed with a binding agent to the upper surface of the wind-
up lever seat (C35), dissolve the binding agent, using such solvent as Methyl-ethyl-ketone or Acetone,
before attempting to remove the screw. Remember that in our current products a binding agent is used
not on the surface of the wind-up lever seat (C35) but on the rapid wind lever retainer screw (C73).
b. SHUTTER SPEED DIAL (E23)
With the shutter dial set at " B," remove 3 small screws (23) and you will find it easier to perform
disassembling.
c. REWIND KNOB (D06)
With a screw driver or a similar tool inserted into the fork of the rewind shaft (D05), which goes into one
end of a film cassette, rotate the crank (D10) counter-clockwise more or less forcibly and unscrew it. If
the flat nut (D09) is taken out, using special tool No. 225K-D09-A, the film type dial washer (D02) and
film type dial (D08) will come out simultaneously.
d. TOP COVER PLATE (A03)
Take out 1 screw (18) on the upper side of the top cover plate (A03) and then 2 screws (19) on both sides
of the finder eye-piece and push the plate strongly upward.
e. FRONT COVER PLATE (A05)
Remove 4 screws (19) and you will find the front cover adjust washer (A39) between the front cover
plate (A05) and the body proper (A01); this is intended for the mechanical back to be 45.46mm. In the
event (A05) is not replaced, fix the plate at time of reassembling to its original place, and correct
dimensions can be maintained without making adjustment.
f. BOTTOM COVER (A04)
Remove 2 screws each (18) and (16).
2. Disassembly of Mirror Housing and Optical Parts.
a. PRISM SEAT (B01)
Take out 3 screws (13) by tightly holding the prism seat (B01) with fingers to protect it from floating by
the elasticity of the ground glass holder (B79). The prism (AF17) should not be dismantled from the
prism seat (B0l) as far as possible, but when it is to be removed, unscrew either one of the 2 adjustment
screws (21).
b. MIRROR HOUSING (B02)
Unloose the screw (I) of the lug plate (B77) at X contact on the bottom part of the body proper (A0l),
slowly correct the cord B (B73) with tweezers to make it straight, remove 2 screws (11) and 2 screws
(B71) and take out the mirror housing (B02) slopewise frontward. While taking the mirror housing out,
push it in the direction of B02 so as not to let the curtain actuator lever IB20I hook up the body proper
(A01). Care must also be exercised not to let the cut opening of the mirror actuator lever, bottom (B19),
hook up the edge of either the coupler gear (E18) or the coupler lever (C15).
c. MIRROR (AF12)
Press inward the front edge of the mirror (AF12), say, with the tip of tweezers, and 2 front claws of the
mirror retainer plate (B12) will come off, thereby floating the mirror.
230-2 -5-
NOTE: Never touch the surface of the mirror with a fingertip or any kind of tool. If the mirror gets
dusty, use a soft brush or a blower to dust it off.
3. Disassembly of Top Transport Mechanism.
a. WIND-UP LEVER SEAT (C35)
Press the edge of the spring (Cl9) with finger to prevent it from recoiling, and then take out (C35) from
the wind-up lever shaft (C34), after which if (C19) is properly fixed to (C 35), using shape wire, the
trouble of recoiling the spring can be dispensed with at time of reassembling. (Diagram 1)
NOTE: When recoiling (C19), do it with gloves on. If handled with bare fingers, the spring trends to be
rusted.
(Diagram 1)
b. LEVER STOPPER (Cl0)
Take out 2 screws (15) and 2 stopper washers (C68).
c. TOP FIRST GEAR (C20)
Prior to taking out the top 1st gear (C20), mark the body proper (A01) with a dot, indicating the spot
extended from the corner of either one of the two projected points and an accurate angle can be easily
determined when reassembling. (Diagram 2)
(Diagram 2)
Mark here with a dot
d. WIND-UP LEVER SHAFT (C34) Unloose 3 screws (17).
4. Disassembly of Bottom Transport Mechanism.
a. BOUNCE STOPPER ACTUATOR LEVER (E08)
Remove the bounce stopper lever screw (E103) and ease the bounce stopper actuator lever screw (E100)
and take out; he bounce stopper lever (E99) and bounce stopper spring (E102) with particular attention to
the washer W3--located beneath (E98).
NOTE: When (E98) is removed, (E99) must also be taken out, because once (E98) is dismantled, (E99)
is invariably placed in a position where the bounce stopper mechanism is at work, and if, by any
chance, the shutter is cocked, the 1st curtain will thereby very likely be damaged.
b. COUPLER LEVER (C15)
Remove the coupler lever retainer screw (C80).
230-2 -6-
c. "R" LEVER PARTS (C70)
As the "R" button is screwed in, remove it by turning it counter-clockwise
forcibly with finger. When the "R" lever retainer screw (C52) is taken out,
the "R" lever spring (C62), "R" lever (C70), W9 and bottom 1st gear (C25)
will come out from the lower bottom 1st gear shaft (C46).
d. PIN ADJUST PLATE (C17) Remove the screw (14) and then unloose 2
screws (23).
e. WIND UP SHAFT PARTS
Press the top main gear (C23), using special tool No. 225K C23 A, and take
out the bottom main gear (C24) by turning it counter-clockwise and thereby
unscrewing it, using special tool 225K C24 A. (Diagram 3)
NOTE:
1. Do not turn (C23) counter-clockwise under any circumstances.
2. W17(s) located at the upper and lower parts of the spool brim are intended for adjusting the weight of
load on the rotation of the spool, in view of which their number and location have to be remembered.
The wind-up shaft bearing (C32) should be taken out along with the wind-up shaft (C 31) by
loosening 3 screws (17), and then the top take-up spool brim (C13), the bottom take-up spool brim
(C14) and the take-up spool shaft (C33) will come off.
REFERENCE:
The center diameter of (C31), in some cameras, is found narrower for it is intended to lighten the
camera weight and should be considered as an improvement.
f. Sprocket Shaft (C30)
Take out the coupler lever seat (C16), sprocket seat spring (C63) located beneath the seat, and then the
sprocket cover (A06). Unloose the sprocket screw (C56), and the bottom 3rd gear assembly (0C27) can
be easily taken out from the body proper.
5. Disassembly of Shutter Mechanism.
NOTE: When disassembling the shutter mechanism, close attention must be paid to the coupling relations
and locations of various gears.
a. SHUTTER GEAR MECHANISM
(1) Pinion Coupler Lever (E10)
Unloose the pinion coupler lever retainer screw (E52), and (E10) and the underneath washer (W2) can be
taken out.
(2) Coupler Gear (E18)
Unloose the coupler gear retainer screw (E53), and (E18) can be taken out together with the underneath
washer (W3)
(3) Coupler Pinion (E13)
Insert a driver through the cut-opening located at the back of the bottom part of the body, unloose the
coupler pinion screw (E88), and forcibly pull it out from the 2nd curtain pinion shaft (E32).
NOTE: Care must be exercised not to press the driver too hard; otherwise (E32) might be bent.
(4) Shutter Rod (E29)
Remove the actuator rod (E30) by turning it counter-clockwise. Remove LW17 from the idling gear
retainer screw (E50), and then (E30) can be taken out upward from the body proper.
REFERENCE:
In the event the idling gear parts alone are to be taken out for disassembling or washing purposes, do not
go through the trouble of removing the mirror housing or the shutter rod (E29); just remove the release
230-2 -7-
plate (E05) by loosening the release plate nut (E119), and the desired parts can be taken out.
(5) Slow Speed Rod (F12)
Ease the cam coupler plate nut (F11), using special tool No.225K-FII-A, remove the cam coupler plate
(F02). Then remove LW13, intended to check up-and-down movement of the slow speed rod (F12), and
the governor at the bottom of the body proper and its coupling parts can be taken out at the same time in
one body from the bottom parts of the body proper.
(6) Speed Selector Disc (E68)
Take out the index ring (E24) from the speed gear shaft by unloosening 3 screws (23), and (E68) can be
also removed.
(7) Unloose 2 screws (9) for the click spring (E83), and it can be taken out along with the light seal (C87).
REFERENCE:
The light seal (C87) began to be installed in 230 2 at a later stage of production for the following reasons:
For Product No 232 (with self-timer), a top mec. plate (C01) with a cut opening is used in view of its
mechanical structure, and (C87) is accordingly installed for the purpose of insuring complete prevention
of light leakage. As, however, a change was effected to make use of (COD for 230-2 for 232 as well.
(C87) was added.
Consequently, in a case where (C0l) is devoid of any cut opening, (C87) is not required. (Diagram 4)
(Diagram 4)
(8) High Speed Cam Parts
Ease the selector shaft tube retainer screw (E117) and remove the selector collar (E25) from the selector
gear shaft (E26), and the high speed cam (E85) parts, the cam shaft spring (E56) and the cam shaft spring
receptacle (E79) can be taken out.
For disassembling the high speed cam parts, namely, (E85), cam shaft (E69) and cam shaft nut (E76), use
special tools No. 230K - E69 A and No. 230K - E76A.
(9) Bulb Lever Paris
By easing the bulb lever nut (E48), the bulb lever parts can be taken out in a body from the bulb lever
shaft (E27).
NOTE: Before attempting to remove the bulb lever parts, see to it that the bulb lever spring (E62) is
dismantled from the bottom Bulb lever (E06B).
(10)Idling Gear Parts
When the idling gear retainer screw (E50) is removed, the idling gear parts located beneath it, viz., the
spill receptacle plate (E09), top idling gear (E17), spill (E08) and bottom idling gear (E16) can be taken
out. Make sure to remove the spill rest (E21) beneath (E16) and the spill spring (E58) at the same time as
these are liable to be lost.
(11)Stopper (C11)
Ease 1 screw (12) and stopper nut (C92), and the stopper (C11) can be removed.
NOTE: Once the stopper (C11) is removed, the pinion rotates freely, thereby tending the shutter curtains
to strip off the shaft. Consequently, before attempting to remove C11, see to it that the tension of the
shutter curtain spring is weakened. (Refer to 5. b. 1.)
REFERENCE:
When the shutter curtains, 2nd curtain pinions (Ell) (E12), bottom selector gear (E14) and top
selector gear (E15) are not to be replaced with new ones, mark the exact coupling positions of the
gears before removing (C11) for the purpose of facilitating reassembling. (Diagram 5)
230-2 -8-
Diagram 5
b. SHUTTER CURTAIN PARTS
NOTE: When attempting to overhaul the shutter curtain parts, strict care must be exercised not to tear off
the curtain from the pipes; not to make a hole in the curtain with such tool as tweezers; and not to
stain them with oil.
(1) Curtain Spring Adjust Gear A (E92)
Put a driver into the slot of the curtain spring adjust gear A (E92i to prevent its rotation, take out the
curtain spring adjust lug (E42) from the gear, and then turn the driver slowly clockwise, thereby placing
the curtain spring back to its original position with no tension. For overhauling (E93), the same
procedure may be followed.
NOTE: The curtain spring should never be placed back to its original position rapidly. Put a driver into
the upper slot of the 1st curtain shaft (E33) to prevent its movement, and turn (E92) clockwise,
unloosening the screw to take it out. The curtain spring adjust gear B (E93) should also be
overhauled in exactly the same manner. Remember that (E92) and (E93) screw counter-clockwise.
(2) Sync. Gear (E104)
If LW13 is pulled out of the sync, gear column (E105), (E104) can be removed.
(3) Top Shaft Plate (E01)
When 2 pcs of LW13 and 2 pcs of screw (72) are removed, the curtain pipes and shutter curtains can be
taken out in a body from the body proper.
(4) Top Mec Plate (C01)
Ease the 1st curtain checker arm stopper (E86) and stopper column (C42), and the 1st curtain pinion
shaft (E31) and 2nd curtain pinion shaft (E32) can be taken out in a body from the body proper.
(5) Top Mec. Plate (C01) and Shutter Curtains
Ease 3 pcs of pinion shaft retainer screw (E55) and the 1st, and 2nd curtain pinion shafts (E31) (E32) can be
pulled out of (C01).
6. Disassembly of Mirror Housing Mechanism.
NOTE: Overhauling of the mirror housing mechanism may be made from any parts you desire, but the
following points must be borne in mind:
(a) Do not turn the red lacquer sealed 2nd dia. lever adjust screw (B59), because this screw is
adjusted to cause the rotation of the 2nd dia. lever (B54) when the shutter bottom is depressed to 1.2
- 1.7 mm.
(b) Do not ease the mirror seat rest screw (B13) which retains the mirror seat rest (B14). The
(B14) is properly adjusted to maintain the mirror at the correct 45