ASAHI PENTAX S3 Service Manual
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ASAHI PENTAX S3 Service Manual

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PRODU CT N O.2 3 0 -2
ASAH I
PEN T AX S3
SERV I CE M AN U AL
230-2
-1-

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Summary of Contents for ASAHI PENTAX S3

  • Page 1 PRODU CT N O.2 3 0 -2 ASAH I PEN T AX S3 SERV I CE M AN U AL 230-2...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Page INTRODUCTION.....……………………………............... 4 SUMMARY OF STRUCTURE AND PERFORMANCE ..……………………….....… 4 CHAPTER I. DISASSEMBLY........…………………………...... 8 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.

  • Page 3: Introduction

    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).
  • Page 4 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.

  • Page 5: Chapter I. Disassembly

    DI SASSEM BLY CH APT ER I . 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;...

  • Page 6: Disassembly Of Top Transport Mechanism

    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. 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...

  • Page 7: R" Lever Parts (C70)

    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).
  • Page 8 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.

  • Page 9: Shutter Curtain Parts

    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.

  • Page 10: Assembly And Adjustment

    ASSEM BLY AN D ADJ U ST M EN T CH APT ER I I . In this Chapter II, photographs are shown, besides diagrams, in the order of assembling, where considered helpful. For instance, photo No. 3 shown under 1. b, illustrates the assembled condition up to the stage of the stopper (C11).
  • Page 11 Photo 1 (2) Relative position of the shutter curtains and the bottom selector gear (E14), after assembling (E14) with bulb lever parts, should be determined by gearing (El4) with (Ell) in the wound-up condition of the shutter curtain as illustrated in Diagram 7. (E14) and the pinion shaft need oiling. NOTE: When resetting the shutter curtains to the un-cocked condition, do it slowly.

  • Page 12: Stopper (C1I)

    Diagram 8 Location must be adjusted the tolerance of 0.5mm b. STOPPER (C11) After installing the 1st curtain checker arm (E07) and the stopper (C11), the gap between the projected point of the selector gear stopper (E77) and (C11) should be adjusted to be 0.2-0.3 mm in the cocked condition.
  • Page 13 Ease the force of (C75) and also the pressure on (E08), and the top main gear (C23), (E16) (EOS) slightly turn backward with the tension of the wind-up shaft spring (C57); then the non-return arm (C04) springs into the groove underneath (E16) and then stops. While maintaining this position, fix the top idling gear (E17), paying careful attention to "t".
  • Page 14 Photo REFERENCE: How to make adjustment if the pin adjust plate (C 17) is of the old type: In the case of (C17) of the old type (prior to the introduction of the improved one), the range of adjusting the position of the coupler lever pin (C51), after completion of the adjustment of the idling gear, is slight;...

  • Page 15: Bounce Stopper Mechanism

    In the event a wide gap has been created on either parts, lift the top 1st gear (C20) and change its engaging position with that of (C21). In the event any one of the gears on the upper part of the body proper has been replaced, proper adjustment of the aforementioned gap may sometimes be found impossible.

  • Page 16: Pinion Coupler Lever (E10) And Coupler Lever (C15)

    f. PINION COUPLER LEVER (E10) AND COUPLER LEVER (C15). After fixing the mirror housing assembly (0B02) and (E10) to the body proper, the following adjustment has to be performed: (1) Adjustment of (E10) The "A" part of (E10), before shutter rocking, is supposed to be in parallel with the groove of the body proper checked by the coupler gear stud (E46) of the coupler gear (E18) as shown in Diagram 17-A;...

  • Page 17: Curtain Speed

    (1) Adjustment of curtain travel speed. (2) Adjustment of high speed exposure timing (l/1000 sec-1/30 sec.). (3) Adjustment of slow speed exposure timing (1/15sec.- 1 sec.) a. CURTAIN SPEED The curtain travel speed is the time required for the shutter curtains to run through the picture format (36 mm).

  • Page 18: Slow Speed Exposure Timing

    d. SLOW SPEED EXPOSURE TIMING Slow speed exposure timing can be determined by adjusting the exposure timing for 1/15 sec (6.7 ms), and the exposure timing for the rest (1/8-1 sec) may be determined automatically by dint of the slow speed cam (F01).

  • Page 19: Exposure Timing At Various Points On The Picture

    Diagram 19 f. EXPOSURE TIMING AT VARIOUS POINTS ON THE 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 providing exposure on the film successively. In view of this, it becomes necessary to measure the time of exposure at various points on the picture formal.
  • Page 20 uncocked, (C07) should not idle in the direction of its rotation, checked by the cut-opening of (A03), and (C53). (Diagram 22, 23) Diagram 22 Diagram 23 If the gap of (C07) is considerable, it will invariably result in the counter dial travelling double scale space even by single cocking.

  • Page 21: Adjustment Of X Contact

    but if moved more than 1 1/3 pitch, the "B" part must be filed off properly. Diagram 27 Lastly, install the counter plate (C12) joined with (C28), namely, (0C12) and then match the index mark of the covering ring (C39). The index mark should be matched before cocking. (Diagram 28) Diagram 28 4.

  • Page 22: Adjustment Of Mechanical Back

    Diagram 30 6. Adjustment of Mechanical Hack. The distance from the film guide rails to the helicoid seat (A15) affixed to the front cover (A05) is referred to as " Mechanical Back," which should be adjusted to be 45.46 +/- 0.03 mm. Use the special gauges and tools illustrated in Attachment 1, viz., 230N-A01-A, dial gauge, dial comparator, 230N A15 A and 230N- A01-A2.
  • Page 23 Diagram 33 Diagram 34 Adjustment should be made so that the image at the center as well as at the four corners on the ground glass are equally in focus. NOTE: (1) Three pcs of screw (B63) have to be turned very slowly and alternatively. (2) Upon completion of the adjustment, securely affix (B63) with binding agent.

  • Page 24: Final Tests

    Check whether the shutter speed dial and the index ring are correctly aligned. This checking is necessary because the speed dial couples with Asahi PENTAX clip-on meter. Also, check whether the speed dial turns smoothly and clicks properly at each calibration.
  • Page 25 Measure the time of exposure at 1/1000 sec, and check whether the exposure is consistent. Also find out if there is any even-lessness if viewed from the rear. Then measure the time of exposure at 1/15 sec. The best way of checking the shutter bounce is to carefully watch from the back side of the picture format, releasing the shutter at 1/60 sec.

  • Page 26: Causes Of Defects And Servicing

    CH APT ER I V . CAU SES OF DEFECT S AN D SERV I CI N G DEFECTS CAUSES SERVICING Rapid wind lever stops Damaged spring (C19) Replace (C19) while cocking, or does not return automatically. 1. When the shutter is released, the spill (E08) remains lowered.
  • Page 27 DEFECTS CAUSES SERVICING 1. The gap between the extreme point of 1. Adjust the engaging position of (C28). the counter advance lug (C06) and the (Refer to Chapter II, 3.) Film counter dial does tooth of the transport gear (C28) is wider not move.
  • Page 28 DEFECTS CAUSES SERVICING Though the mirror seat (B10) flips up, the Check if the mirror seat flipping mechanism Shutter curtains do not 1st curtain checker arm (E07) does not is functioning smoothly. If found O.K., re- start. slip off the stud of the top selector gear place the mirror seat spring (B44) as it might (E15).
  • Page 29 LI ST OF SPECI AL SERV I CE T OOLS 225K C36-A C36 Driver 230N-A01-A Mechanical Back Gauge 226K-D15-A D15 Driver Dial Gauge Mechanical Back Gauge 225K-D09-A D09 Driver Dial Comparator Mechanical Back Gauge 225-C23-A C24 Holder 230N-A15-A Mechanical Back Gauge 230N-A01-A2 Mechanical Back Gauge 225K-C24-A C24 Driver 229K-E64 65-A Shutter Curtain Wind-Up Driver...
  • Page 30 Watch Oiler 225K-F11-A F11 Driver 230K B63 A B63 Adjust Driver Oil Cup 230K-E69-A E85 Holder 230-2 -30-...
  • Page 31 LIST OF LUBE OIL 1. “L” Lubrication. The letter "L" stands for liquid lubrication oil. In the event a watch-oiler is used, "one droplet of oil" means such quantity of oil as is found on the extreme point of the watch-oiler when it is lined from the oil cup after soaking into oil at a 45 angle.
  • Page 32 Where To Apply. Quantity of Oil (Number indicates droplets of watch oiler) Between (E31) (1st curtain pinion shaft) and shaft bearing of (C01) (top mec. plate). Between ( E31) (1st curtain pinion shaft) and shaft bearing of (C02) (bottom mec. plate) Between (E32) (2nd curtain pinion shaft) and shaft bearing of (C 01) (top mec.
  • Page 33 Between (B35) (mirror actuator lever shaft), (B18) (mirror actuator lever, Thin Japanese writing brush. top) and (B19) (mirror actuator lever, bottom) hole Contact between (B42) (mirror seat lug stud) and (B83) (mirror checker spring). Between (C24) (bottom main gear) and shaft bearing of (C02) (bottom Thin Japanese writing brush.
  • Page 34 " Between narrow part of (C3D) (sprocket shaft) and hole of (A01) (body proper). (small quantity) " Between (C30) (sprocket shaft), hole of (C02) (bottom mec. plate) and (W22). (small quantity) Between (C31) (wind up shaft) and (C57) (wind up shaft spring). Thin Japanese writing brush.
  • Page 35 LIST OF BONDS NOTE: 1. Immediately after use of binding agent, its container has to be capped tightly. Preferably it should be divided and kept in as smaller containers as possible. When not in use, the container has to be capped tightly. 2.
  • Page 36 Penguin No. 332 N Binding Places Tool B26 (sync. seat insulator) B25 (sync. seat) Spatula E64 (1st curtain shutter) E35 (1st curtain wind shaft, top) E64 " " E36 (1st curtain wind shaft, bottom) " E65 (2nd curtain shutter) E 39 (2nd curtain pipe) Brush Penguin No.
  • Page 37 EX PLODED I LLU ST RAT I ON S Fig.1 230-2 -37-...
  • Page 38 Fig. 2 230-2 -38-...
  • Page 39 Fig. 3 230-2 -39-...
  • Page 40 Fig.4 230-2 -40-...
  • Page 41 Fig. 5 230-2 -41-...
  • Page 42 Fig. 6 230-2 -42-...
  • Page 43 LI ST OF SERV I CE PART S Produc t N o. 2 3 0 -2 ASAH I PEN T AX S3 Note: The parts with numbers starting with ' 0' are assembled parts, and the *marked parts are included in the ' 0 '-starting assembled parts. PART NO.
  • Page 44 A33 * Back cover covering A34 * Cassette holder rivet A35 * Earth A36 * Pressure plate retainer stud B A37 * Hinge rivet Front cover adjust washer A40 * Indicator window Light seal Light seal Strap hook screw Prism seat 0B02 Mirror housing assembly (B02, B21, B76, R304) Ground glass frame...
  • Page 45 B32 * X lever retainer plate B33 * Protector plate pin Mirror actuator lever shaft Mirror actuator lever retainer screw B37 * 2nd dia lever checker plate rivet B38 * Mirror actuator lever spring hanger A B39 * Mirror actuator lever spring hanger B B10 * Curtain actuator lever stay Actuator lever spring hanger...
  • Page 46 B74 • Tube A B75 * Tube B B76 * Actuator lever column B77 * Lug plate B78 * Magnifier cushion Ground glass holder B80 * X lever rivet Mirror hinge screw Mirror checker spring B84 * Actuator lever coupler spring Actuator lever spring Mirror shock absorber 0C01...
  • Page 47 Sprocket C30 * Sprocket shaft 0C31 Wind-up shaft assembly (C31, C23, C32, C57,C75) C32 * Wind-up shaft bearing Take-up spool shaft Wind-up lever shaft 0C35 Wind-up lever seat assembly (C35, C05, C19, Counter screw Arrow ring Lever seat collar Covering ring R button C41 * Top 1st gear column...
  • Page 48 Bottom mec plate retainer screw Rapid wind lever retainer screw C74 * Spring Retainer screw C75 * Top main gear retainer screw C76 * Pin adjust plate stud Cover ring retainer screw Bottom 2nd gear spring C79 • Gear column pin Coupler lever retainer screw C81 * Lug spring retainer screw...
  • Page 49 Spill Spill receptacle plate 0E10 Pinion coupler lever assembly (E10, E75) 0E11 2nd curtain pinion assembly (Ell, E32, E49) E12 * 1st curtain pinion Coupler pinion 0E14 Bottom selector gear assembly (E14, E44, E73) 0E15 Top selector gear assembly (E15, E43, E70, E77, E84) 0E16 Bottom idling gear assembly (E16, E19I Top idling gear...
  • Page 50 E49 * Pinion retainer pin Idling gear retainer screw lst curtain checker arm retainer screw Pinion coupler lever retainer screw Coupler gear retainer screw Adjust lug screw E55 * Pinion shaft retainer screw (Only 2 supplied with 0E64) Cam shaft spring Shutter rod spring Spill spring E59 *...
  • Page 51 2nd curtain shaft plate E90 * 1st curtain wind shaft bearing, lop E91 * 1st curtain wind shaft bearing, bottom Curtain spring adjust gear A Curtain spring adjust gear B E94 * 2nd curtain shaft E95 * 1st curtain pipe E96 * 1st curtain spring E97 *...
  • Page 52 F09 * Lever support nut (Only 1 supplied with 0F05) F10 * Cam coupler plate stud Cam coupler plate nut F12 * Slow speed rod Slow speed rod receptacle F14 * Lever support F15 * Slow speed lever seat Slow speed spring F17 * Slow speed actuator lever stud Adjust plate screw...
  • Page 53 LIST OF STANDARD PARTS Produc t N o. 2 3 0 -2 ASAH I PEN T AX S3 Standard Small Screws Index No. Name Surface Place of Use Quantity Treatment Small screw, flat, medium 1.2x1.6 Nickel G02, G13 Black E112, B77 G04, G14 "...
  • Page 54 Set screw, flat 1.7x4.5 A01, C11 Set screw, tapered 1.7x2 C17, C24 E24, E26 E23. E68 Lock Washer Code Material Thickness (mm) Place of Use Quantity LW10 LW13 E105 LW17 Washers (NOTE: Asterisk " denotes quantity which is subject to change.) Steel 0.03, 0.05, 0.1 E09, F14...

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