Pentax MX Service Manual
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Pentax MX Service Manual

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SERVICE MANUAL

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  • Page 1 SERVICE MANUAL...
  • Page 2 23800 Disassembly procedure 1. Peel off Body coverings (A19 & A20) 2. Remove Bottom cover (A400), Connector seat (A34) and Tripod screw (All). CSS 1.7 x 2.2 x 3, CSM 1.7 x 3.5 x 2 3. Remove Top cover (A300) a.) Retainer screw (Left handed) Winding lever assembly (C300) Cover ring B (A329)
  • Page 3 P.C.board assembly (J500) — CNM 1.7 x 2.5 x 2 Base plate screw (A41-01) 10. Unsolder lead wires. 8 pcs 11. Mirror housing complete assembly (B000) After loosening Screw (M75), disconnect Idle gear assembly (0-M74) and Supporter plate assembly (0-M53). b.) Remove Mirror housing complete assembly (B000) together with Prism seat assembly (0-M1), Penta prism assembly (0-L3) and Cell frame (J201).
  • Page 4 Pinion coupler gear assembly (0-C249) — CNL-E 1.7 x 2.5 Pinion coupler lever assembly (0-C254), (C257) (C 137) Coupler lever spring (C266).Coupler lever spring hook screw (C214), Cord holder (J525). Coupler lever assembly (0-C244), Coupler lever retainer screw (C248) — left handed. Installing seat assembly (0-A508) —...
  • Page 5 36. Winding shaft assembly (0-C19) 37. Restitution retainer lever (C22) a.) Supporter screw (C24) b.) (C22) c.) Restitution lever spring (C25) d.) Collar (C23) 38. Coupler pinion (E11) — Retainer screw (E12) 39. Reversing plate (E111) a.) C137 — b.) E111 — c.) E112 — W6 40.
  • Page 6 50. Coupler gear assembly (0-C222) Coupler gear retainer screw (C226) — left handed 51. Rewinding actuator lever assembly (0-C241) a.) CNL-B 1.4 x 2.0 b.) Spring retainer.(C243) c.) Rewinding actuator lever spring (C242) d.) 0-C241 52. Bottom mec.plate assembly (C200) a.) Stopper pole (C267) —...
  • Page 7 Assembly procedure 1. Bottom mec.plate assembly (C200) a.) Sprocket (C236) b.) Bottom mec.plate assembly (C200) — positioning with (C202) c.) C268, C267, CNS 1.7 x 2.5 2. Spool a.) Install spool (0-C20) and Spacer (C29) b.) Top shaft receptacle (C17-01) c.) Bottom shaft receptacle (C202) Vertical clearance of Spool is adjusted with W73 (t=0.5 or 0.6mm)
  • Page 8 When both curtains are wound and hooked with 1st curtain ratchet assembly (0-E135), adjust the clearance at 0.1mm between high speed.lever and Bottom selector gear assembly (0-E124) with turning Adjusting stud (E122). Curtains overlapping After cocking the shutter, both curtains should be overlapping completely or within ± 0.1mm deviation.
  • Page 9 b.) Bottom winding mechanism W16 — 0-C216 — C218 — W24 — C270 — C269 — C219 — C220 — C221 — C265 (left-handed) Caution; * W16 should be installed first separately from (C216), otherwise (C216) can not be installed together with W16.
  • Page 10 17. High speed lever assembly (0-E126) — 0-E126 — 0-E132 — E133 — E134 * After installing the above parts, 1st curtain ratchet assembly (0-E135) functions automatically. 18. X contact seat assembly (0-J621) — CNS 1.7 x 2.5 19. Self-timer (H100) — CNM 2.0 x 9.0, CNM 1.7 x 3.0 * Install self-timer pushing upper left.
  • Page 11 Slow speed cam shaft (E401) E401 — E405 — LW17 x 3 — W70 * Up and down play of (E401) should be within 0.1mm. Shutter seat plate assembly (E200) a) Cock the shutter b) Put on selector gear collar (E123) c) High speed cam assembly (0-E210) d) Install (E200) taking care of jointing part with slow speed cam shaft.
  • Page 12 30. Slow speed cam assembly (0-E402) a) Shutter speed at B b) Small rivet of (0-E402) should align straight with the center of (E401) and sprocket shaft as shown in Figure, and fasten Nut (E406) catching (E401) with pliers. Fasten set screws also. * When (E406) is fastened without catching (E401) with pliers, jointing split part underneath (E200) spreads with revolving power of (E401), and slower shutter speed will be affected.
  • Page 13 Tv indication a) Shutter speed at 1/1000 b) Lower pulley of Pulley seat assembly (0-M76) should be in parallel with camera. c) Adjusting plate assembly (0-M68) — (M72) = left handed d) Restitution spring assembly (0-M62) — (A5) — (M85) * Turn wire 1 turn counter-clockwise around the pulley of (0-M62) * After installing (0-M62), Tv wire should not be loose.
  • Page 14 Terminal contact assembly (0-J611) Soldering lead wires 8 pcs. Shutter speed adjustment a) Curtain speed 12.2 — 12.3ms Same way with SP camera. b) High speed adjustment 1/1000 — 1/60ms Same way with SP camera c) Slow speed adjustment 1/30 — l sec 1 Loosen screw 2 Adjust with eccentric screw 3 Fasten screw...
  • Page 15 Tv indication dial should be set just center portion of viewing finder. Tv indication (1000) should be set as shown in Figure. Three jointing gears (0-M53), (0-M62) and (0-M74) must function well.If they do not, adjust the position of Idle gear supporter plate (M73) with eccentric screw Each figure of Tv indication must come...
  • Page 16 Light measurement a.) Temporary setting — Top cover tool, shutter dial, winding lever b.) Battery checker — VR EV12, f8, 1/60, ASA100 2.6V Light off 2.7V Light on c.) Light measurement — VR or VR EV12, f8, 1/60, ASA 100, 2.8V When shutter dial is turned 1EV step (1/60 —...
  • Page 17 ASAHI PENTAX MX (23800) Curtain assembly 1. Curtain inspection Check if Aron-alpha is applied to curtain string as shown in Figure. Aron-alpha is applied to increase durability.Curtain string should be, bent parallel with shutter curtain. 2. Install 1st and 2nd pinion shafts (0-E2, 0-E7), (0-E118), (0-E108), (0-E135) and 2nd curtain assembly (0-E38) to Top mec.plate assembly (0-C1).
  • Page 18 Install adjusting plate (E120) and other parts. Adjusting plate (E120) is installed after turning Top selector gear and Selector retainer (0-E118) to cocked position. 10. Install 1 curtain string to bobbin (E3). Confirm curtain overlapping and slit parallel, with adjusting the length of 1st curtain string.Aron-alpha is applied to curtain string and its retainer screw (CNS 1.4 x 1.6) after adjustment is finished, and cut the curtain string after turning around the Bobbin one time...
  • Page 23 LIST OF SERVICE PARTS Product No.23800 ASAHI PENTAX MX Note: The parts with numbers starting ‘0-’ are assemblies. 0nly available parts are listed below. Parts No. Description Quantity Interchangeability Body proper Hinge Hinge collar Hinge retainer plate Hinge retainer spring...
  • Page 24 Parts No. Description Quantity Interchangeability Connector retainer screw A41-01 Base plate screw Spacer A43-01 Light seal curtain Light seal D Light seal E Light seal F Light seal G Strap hook retainer screw Light seal tape A100 Front board plate assembly (A101 —...
  • Page 25 Parts No. Description Quantity Interchangeability A148-01 Restitution spring A149 Front board light seal A200 Back cover assembly (A201, A203, A207, A208 x 2, A209, A210 x4, A211, A212, A213, A214, A215, A216 x 4, A217 x 2, A218 A219, A221, A222-01 x 4, A225, A226, A227) A202 Back cover shaft receptacle 0-A204...
  • Page 26 Parts No. Description Quantity Interchangeability A330-01 Window C A332-01 Mask A334-01 Pattern retainer A335 Light seal A336 Insulation tape A400 Bottom cover (A401, A406) A403 Bottom winding cap 0-A405 Battery cap assembly 23602-0-A403 (A405, A406) 0-A501 Shutter rod assembly (A501, A505, A507) 0-A502 Release plate assembly (A502, A503, A506, A516)
  • Page 27 Parts No. Description Quantity Interchangeability B51-01 Stopper screw Diaphragm actuator lever spring 0-B55-01 Mirror actuator plate assembly (B55-01, B56, B57, B58, B93) 0-B59 Mirror charge lever assembly (B59, B60, B61, B62, B63.) 0-B64 Mirror charge lever retainer assembly (B64, B65) Mirror charge lever collar screw Restitution spring Mirror seat spring...
  • Page 28 Parts No. Description Quantity Interchangeability B111 Light seal curtain B112 Light seal curtain B 0-C1 Top mec.plate assembly (C1, C2, C3, C4 x 2, C5, C6, C7, C8, E5) 0-C9 Top 2nd gear assembly (C9, C10) Top 2nd gear shaft retainer nut C17-01 Top shaft receptacle Stopper retainer screw...
  • Page 29 Parts No. Description Quantity Interchangeability C230 Clutch ring C231-02 Clutch ring retainer screw 23602-C14 C232-01 Clutch ring retainer screw collar 23602-C15 C233 R button C234 Sprocket spring 23602-C11 C235 Sprocket collar C236 Sprocket 0-C241 Rewinding actuator lever assembly (C241, C237, C238, C239, C240) C242 Rewinding actuator lever spring C243...
  • Page 30 Parts No. Description Quantity Interchangeability Rewind shaft 0-E2 1st curtain pinion shaft assembly (E2, E1) Bobbin Retainer screw 0-E7-01 2nd curtain pinion shaft assembly (E7-01, E1) Coupler pinion Coupler pinion screw E15-01 Roller A Roller B 1st curtain shaft collar 0-E36 1st curtain assembly (E36, E20, E21, E22, E23, E24, E25, E35, E37)
  • Page 31 Parts No. Description Quantity Interchangeability E121 Adjustable plate screw E122 Adjusting stud E123 Selector gear collar 0-E124 Bottom selector gear assembly (E124,E115, E125) 0-E126 High speed lever assembly (E126, E127, E128, E 129, E130, E131, E137) 0-E132 Indication plate assembly (E132, E138) E133 Nut A...
  • Page 32 Parts No. Description Quantity Interchangeability E231 Shutter dial screw E401 Slow speed cam shaft 0-E402 Slow speed cam assembly (E402, E403, E404) E405 Spacer E406 23723-C419 E407 Governor restitution plate E408 Restitution plate shaft E409 Restitution plate spring G100 Governer H100 Self-timer J201...
  • Page 33 Parts No. Description Quantity Interchangeability J539 Adhesive tape 0-J601 Synchro terminal assembly (J601, 3602, J603) 0-J611 Terminal contact assembly (J611, J612 x2, J613 x4) 0-J621 X contact seat assembly (J621, J622, J623, J624, J625 x 4) Mirror Fresnel lens 0-L3 Penta prism assembly (L3, L6-01, M11) 0-L4...
  • Page 34 Parts No. Description Quantity Interchangeability 0-M74 Idle gear assembly (M74, M83) Screw 0-M76 Pulley seat assembly (M76, M77, M78, M79, M80, M81) M85-00A Bobbin A -00B Bobbin B 23800...
  • Page 35 LIST OF STANDARD PARTS Product No.23800 ASAHI PENTAX MX Small screws: Description Surface treatment Position of use Quantity Set T 1.2 x 2 Black nickel M62, M67 Set T 1.4 x 1.8 “ E402, E401 Set T 1.7 x 2.2 “...
  • Page 36 Small screws: Description Surface treatment Position of use Quantity CSS 1.4 x 3 Black nickel A143, A125 CSS 1.7 x 2 “ B11, B1 CSS 1.7 x 2.2 Nickel A401, A1 A301, A1 Blacknickel B103, B1 A508, A1 CSS 1.7 x 2.5 “...
  • Page 37 Small screws: Description Surface treatment Position of use Quantity CNL-F 1.7 x 1.8 Black nickel C264, C205 CNL-F 1.7 x4 J201,B1 CRSS 1.4 x 1.6 “ (PB-5) E229, E230 Washers: Description Material Thickess Position of use Quantity Brass 0.07, 0.1mm M57, M60 0.3, 0.4 E153, A1...

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