ACCUTRO N Service Manual » 7 < fc ^V \l' i Is IV -:- j.
: 1 PATENT NOTICE The ACCUTRON timepiece is manufactured by Bulova Walch Company, under issued patents as well as pending paieni appli cat ions, including the Following patent*: O.S, Canada France GemuuT) Great Britein Z.MO,5*2i 3,971.3211 l.l82.uoe; j,it4.«P.:Re. ».2S7.7&t; 3.221.190; 3.262.259; 1.411.1 ia 7M.17B: 756,0ia; 085,410 1.102,373; 74.002: 70,710: 1,401.131: 1.473.153: 1.122,1*3 S71.0SU: 1.096,747; 1,124.413 TBI. 009; 797.051: 84D.DH,- BS4.13G; - i:i H fi76,*17: &09.081; 953.U9; 1,064.
Table of Contents Page To the Part I Watchmaker 2 -SERVICING PROCEDURES 3 Opening the Case 3 Replacing the Power Cell 4 Regulation 5 5 ACCUTRON" Regulators How to Regulate 6 Removing Movement from Case 7 8 Movement in Case -REPAIR OF THE BASIC MOVEMENT Replacing Part II Special Tools and 9 9 Equipment ACCUTRON Service Kit 9 11 Cleaning Equipment Rate Recorder II 12-13 Diagnostic Chart Special Points for the ACCUTRON Repairman 14 Mechanism—Inspection and Adjustment Power Cel
To The Watchmaker, This Manual provides complete service and repair information for Scries 218 ACCUTRON movements. Perhaps ynu already have experience in servicing ihe 214 ACCUTRON. which there is a separate service manual. If so. you will fad thai and servicing procedures for 214 and 21 A ACCUTRON movements Tor while Ihe repair are basically Ihe same. there are physical differences between (he two. primarily in the arrangement of parts.
Opening The Case Use special Inckmy
r i Replacing the 218 Power Cell a. Remove case back, using a suitable case wrench to unscrew the locking-ring. COIL FORM SCREW WITH INSULATOR lorm screw b. Loosen c Loosen cell strap hold-down screw, swing cell strap out and remove Power Cell as shown coil CELL SIMP (see Fig. 3). d. Remove coil form screw insulator) POWER CELL slightly. and (with Inspect cell strap, (with loupe) under-surface of cell strap for foreign matter which may affect electrical contact with Power Cell.
MAY is4 iboy Regulation THE BASIC ACCURACY OF THE ACCUTRON TUNING FORK IS SUCH THAT REGULATION FOR MORE THAN A FEW SECONDS PER DAY IS NOT REQUIRED. CAINS OR LOSSES OF A MINUTE OR MORE A WEEK INDICATE THE NEED FOR REPAIR. NOT REGULATION. ACCUTRON The regulators ACCUTRON regulators (see Fig. 4 J are serrated to make them easier la rotate and to serve as a calibration. G3SERVE THE SEVEN "DMSKWS Fig. » The serrations of each regulator form 7 divisions (4 projections and 3 indentions).
IS How To Regulate of the regulators see Fir. 5 a sufficient number of divisions and necessary to make ihe required correction. Rotating a regulator away from the center of the movement will cause the ACCUTRON timepiece to run slower: rotating a regulator toward the center of the movement will cause it (o run faster. Rotate one or Imlli ( ) in the direction ! m HICULAU ? SECONDS PER DAY SLOWER, MOVE UMIK REGULATOR ONE DIVISION OUTWARD AS SHOWN.
WAY 24 ;3S3 1 Removing Movement From Case stem oat a. Pull b. Loosen setting lever screw [setting position]. 2 turns. (See Fig. 6.) c Withdraw stem. Fig. 6 a. Remove movement from case and place in movement holder. b. Insert stem and tighten setting lever screw. CAUTION: Do not push stem beyond point of engagement with pin on selling lever. (See Special Points, item page Fig. IMPORTANT: S« sore To Indicate model 7 number engraved on movoment whan ordering replacement pans 14.
Replacing r~ Movement In Case
MAY Bt '2Q$ Part II Repair of the Movement Be. Special Tools and Kquipmtrnl kit The revised .| S.-I mm timepiece, IihIi-iI (Model GOO) h Adjusting Tool In mldilirm. the revised sary lo service the 214 Note; Serv.ie Kit httu the specinl tools necessary lo perform Mrvioe ihr ir you already :'.
- rtpn DOOT«l 7WTWI 1. M A "nest" Sol yroridHt to hold « Power Oil during testing. The nest b clearly marked Power Cell or the 213 Power Cell. for proper insertion of either the 214 2. A meter, rending cither volls or ulCrMUBpWVtt todfc*UU| 'he correct values by areas marked "OK." 3. A -1 position Rotary Swildi lor the selection of the VlrfOUl iMl "'"fliiiutis: Position i-"t:i n-( Position 2 Position ft pi )W1-:k ( EH" -"OFF" :t Position 4- "KKAUMICKOAMPKKKS "LOW AMPLITUDE".
: MAY 24 locking-ring A wrench, 1969 wrench designed for opening (he case, is illustrated in Fig. 12. Fig. 12 collet adjusting tool This tool, illustrated fingers II is m Fig. 13. is mod lo adjust the engagement of the index inserted in ihe index finger collet or the pawl finger collet and p.nvl and gentlv turned to portion 'he index or pawl Jewel with respfr.l 10 tAO Index wfaaol Fig. Ultrannnic rquipment of the ACCUTRON liiiiiir.
HA GAINING OR
MAY 24 "' STOPPED 1. Crown in setting rouD position. Sweep second hand does not turn 2. Power Cell voltage km. but fork hums. 3. Hack mechanism out of adjustment 4. Indexing mechanism out of 5. adjustment Mechanical inter- ference with free, vibrations of fork. 6. Mechanical blockage of train. 7. Dirt in tooth of index wheel. 8. Damaged teeth on index wheel.
- Special Points for ihc ACCUTRON Repairmnn The ACCUTRON movement, br-ing completely different from conventional watch movements, requires different techniques in its repair. Otherwise, it may be damaged by improper procedures on the part of the repairman. For example, turning the hands or the gear train fin either direction) with the hack lever disengaged, will damage the index wheel teeth or the index and pawl fingers The repairman's attention is called to the following special points: 1.
MAY 24 :2S3 Indexing Mr*;hanisro— Inspection and Adjustment The checking and adjustment important to its of the ACCUTROX indexing mer.hanism extremely is operation. This is accomplished by closely controlling the alignment and the depth of engagement of the index and pawl jewels and their interrelation.
2- The lower surfaces tive fingers, as It of the index shown and pawl jewels must be can usually be accomplished, if is rarely required. necessary, without breaking the cement attach- ing the jewel to the finger by exercising tweezers, close parallel to their respec- in Fig- IS.
fiwy : 3. ^ '«UD Rotate index finger collet until index jewel completely disengages from index wheel Observe gap between index gage and index must not touch the finger, finger. index finger thickness- This, as you will see. will make gap does not meet requirements, bend index gage proper gap is obtainedIf INDEX WHEa (See Fig. 18.) The gage but should preferably be very close, say within one it easier at its lt> perform step 4.
HAY 24 7. 1969 cam until pawl bridge is in its maximum clockwise position (maximum position in the direction lo disengage pawl jewel from index wheel| The pawl jewel should not be touching the index wheel and nol more than onehalf its thickness away from the wheel. This distance may be adjusted usinc the Rolale pawl bridge eoUe) adjusting tool.
HAY 2 4 pawl bridge lode screw and check (he lightness of the pivot screw, to assure that the bridge is rigidly clampod in position. 10. rifthtcn Ihe TRON 13. tf it 2. 3. 10). Disconnect the Test Set frum the movement. Place the Power "" Cafl Cell (with yellow seal up) in nest of Test Set. Turn rotary switch on Test Set to "CHECK POWER CELL" Read Power Cell voltage on right-hand "OK" • The ACCU- does not. the adjustment must be made again (steps 7 through Taring 218 Power 1.
Assembly Identifying Defective Coil is intended to identify which coil assembly is defective, when a check of ihe movement current results in a zero current reading, indicating improper This procedure I ii ii r. cnm&n con uw> strip sea* oil ox too* tinning of the eJectrunic circuit.
L MAY u .„^ r \ '/• ; '^. DIAL WASHLR HOUR Wilt I Removing hands, hour wheel a. Pull b. slum oul Remove hands. IMPORTANT; H- nirs to Ideality mode! stamped cm movement when screws). Remove hour wheel with dial Fig- and (setting position] c Remove dial (2 d. dial, washer. 23 ordering replacement parts.
* 1 A CASK SPRING power cat COL SIRAP CELL STRAP Removing power cell and hold down casing spring a. Loosen cell strap screw and b. form screw. Turn cell strap counterclockwise and remove power cell- c Remove 22 coil casing spring (2 screws).
MAY 24 1363 3 INDEX COLLET PAWL COLLET Disengaging index and pawl fingers a. Push stem b.Use in (running position!. collet adjusting tool to rotate index and pawl fingers away from index wheeL Fig.
TRAIN BRIDGE FOURIH WHtEl. SECOND WHEEL INDEX Removing Irain train WHEEL bridRK and wheels a. Remove train bridge |4 screws). b. Remove train wheels. Fig.
v INSULATOR 1 w CELL STRAP i " CELL COIL ASSEMBLY TUNING FORK ASSEMBLY Removing tuning fork and FORK SPACER coii assemblies COMPONENT COIL ASSEMBLY a. Rotate pawl finger assembly clock- wise 180 degrees to clear timing fork and pawl bridge pivot screw. b. Remove tuning fork and coil assemblies (6 screws). CAUTION: Do not pry at tuning fork. to base of Use a punch push tongue of tuning fork through push-oH hole on dial side. c Note position of fork spacers.
HACK LEVER PAWL BRIDGE HACK LEVER SPRING PAWL BRIDGE CAM Removing pawl bridge and hack lever a. Remove pawl (2 b. bridge and cam screws). Remove hack hack lever and lever spring.
MAY 2 1 'WWW 7 r YOKL SETTING WHEEL ClUTCH LEVER MINUTE WHEEL CLUTCH LEVER SPRING Removing yoke, clutch lever, and setting and minute wheels a. Remove yoke fa. Remove clutch lever spring and clutch (1 screw). lever. c Remove setting wheel and minute wheel. Fig. 29 .
_--. FOURTH BRIDGE CENTER WHLEl ASSEMBLY Removing fourth bridge and center wheel assembly a. Remove fourth bridge (2 screws) b. Remove center wheel assembly. Fig.
A £oa CENTER SECOND BRAKE SPRING \ GROUND PLATE 11" V, LEVER .'-.-:.'. Removing setting lever, stem, clutch wheel, center- second brake, and ground plate. a. Remove setting b. Remove lever screw. WHEEL SLUING LEVER setting lever, stem, and clutch wheel. c. Remove center-second brake (1 screw spring | ARemovc ground plate [1 screw). Fig. 31 (lUiLMit para.
J Cleaning cap jewels in jeweling devices with spring-held cap jewels from pillar plate and tram bridge. After cleaning, replace cap jewel assemblies. Separate all quipim-nt Ultrasonic The practice of cleaning a con- ACCUTRON in necessary for cleaning the movi-iiieni should be treated exactly as vnnlional watch, as a routine pari one exception. The electronic of nearly every repair, results be cleaned from the watchmaker's knowl- parts. Sdgt and (Ji.
' B SPOT DRILL (2 PLACES! INDEX WHEEL
r CENTERSECOND BRAKE SI GROUND PUTE SETTING LEVER SCREW Replaciny setting lever, stem, clutch wheel, renter-second brake, and ground plate. .Replace clutch wheel, ttfito, letting lew, nM'l letting lever suraw. .huich b. Lubricatr- Hi- Use m square and pilot M lubricant sparingly SETTING LEVER c Replai-e (l d. center-second brake spring tcrew]. Replace ground plate (1 scrrw). Mocbius OL 207— Special I.nbricant Molybdenum Disulfide with Fi S 33 .
IA — FOURTH BR1DGJ tfNIERWHIH ASSEMBLY Replacing tenter wheel assembly and fourlh bridge. a. Lubricate center Wheal ai.M-mbly and center tube .'M\ Use lubricant sparingly. b. Replies center wheel assembly. c Replace fourth bridge (2 screws). Mocbins OL 207-Spccial Labricanl wilh Mnlvbdcnum Disulfide Fig. 4U iPi^.ii.i-iiniL' . 34 -iii;s,»in.
4 VOKE Replacing minute and setting wheels, clutch lever, and voke. SETTING WHEEL MINUTE WHEEL — ~Sfe CLUTCH LEVER CLUTCH LEVER SPRING a. Lubricate minute wheel pivot and selling wheel post(Mj Use lubricant sparingly- b. Replace minute wheel and setting wheel c Replace clutch lever and clutch lever spring. screw). d. Replace yoke e.
i r HACK UVIR \ / CAWl BRIDGE HACK LEVER SPRINli PAWL BRIDGE CAM Replacing hack lever and pawl bridge. a. Roptecc hack b. Replace hack lever spring wilh short leg toward liiver. as shown, c. Lubricate Slem pilot lever. V where it touches hack lever. Use lubricant sparingly. d. Replace pawl bridge and cam (2 screws) Moebius OL 207-SpeciaI Lubricant with Molybdenum Disulfide Fig.
r ISOLATOR CELL STRAP INSULATING POST COL Replacing tuning fork COIL TUNING FORK ASSEMBLY and coil assemblies. 'FORK SPACER COMPONENT. COIL ASSEMBLY a. Replace toning fork and coil assemblies [6 screws). NOTE: Tuning fork spacers are used lo center fork tines pillar plate b. Replace and between train bridge. cell strap. NOTE: Check that cell strap erly centered on is prop- the insulating post of coil form before tight- ening screw.
MAY 24 '''. Replacing train wheels :-i.;ge and a. train bridge. Oil all cap jewels in pillar plate train bridge FOURTH WHEEL V Oil sparingly. and Do not flood jewels. SECOND WHEEL b. Pnsh stem in (running position]. c. Replace train wheels, INDEX WHEEL CAUTION: MAKE CERTAIN THAT PAWL FINGER HAS BEEN ROTATED AS PER STEP 5c. PAGE 36 TO AVOID DAMAGE TO PAWL FINGER- IN ADDITION.
Mm r Replacing hour wheel, and hands. dial, a. Replace hour whrcl and dial wnnher. b. Replace dial c Pull d. Replace hands. NOTK: (2 screws). stem out [setting position). It is necessary to support the center second upper cap jewel on a proper staking set fitting stump when in a replacing center-second hand. e. Perform hack mechanism adjustmrnt. page 20. f. Perform index mechanism adjustment, pages 15-18. Fig.
MAY 24 1969 CASING SPRING la\ power cai CELL STRAP COIL FORM SCREW CELL STRAP Replacing casing spring HOLD-DOWN SCREW and power cell. Replace casing spring (2 screws). b. Replace power uell [imprinted down, yellow sea) up). c. Tighten cell strap and coil side. form screws. Fig. Replacing movement V 9 See page 8. ID in case. steps 1 and 2. . Regulation following repair.
MA: series 218 a 03 Secund Wheel iad Pinion 1 22 Bridge INA Coil, uuil Fork Fool liiiiC, Hole Jewel and Setting Pawl Bridee Sub-Aiirrably a ZB Tram Bridjtc Screw. Pawl Bridge Lock Screw Third Wheel Assembly 159D 182 spcaft pawl Unas* Cam . I 106 40 Oolr-rTubeAssesbljr Cenlrr Second Hand (To Suit Dial) I .
w MM Selling Lever Screw liack Lever SprinE 209 211 Jr: 3 19 A ' ' ; 00 -'•- 1969 Fourth Bri.lee > -.::-;-.- :: - - / Ground 24 1 212 Plate 320 Casinc Spring Screw sn r 21^ Sjiccial Train 321 C«nl« Swwnd Screw, Ground Pln'r. ScTRW llrakp Sprinc Screw I Pillar Wale J Hack Lever Assembly —***' 1$^* Indo FirtRcr Assembly -'jmponenl Coii Assembly ~«JU 404 Pawl Fingiir Assembly "13 Train Bridee "* s Ho Id -down Screw.
-- Part III Repair of Date Mechanism in Model 218D All information and instructions contained in Parts arc also applicable to the Model 21BD 1 ACCUTRON and II manual of this (Date Model), with the following excepti unit. IMai!:. Tor disassembling, lubricating, are given and ro-nnsembling the date mechanism Ihe .icciinpanyinj! illustrations. For in all other detail-, concerning service und repair instructions for Ihu basic Series 218 ment, refer The parts used .
MAY 24 DIAl IS WASHCR HOUR WHEEL Removing hands, hour wheel ASSEMBLY a. I'ull dial, slem out (setting and position). b. Remove hands. c. Remove dial d- Remove hour wheel wilh dial [2 screws). washer.
MAY - date trip sprwg t :-"[ :;-::-: > 'OWE INDICATOR ,*?*• i >s, DATE INDICATOR TRIP ARM -DATE TRIP WHEEL ASSEMBLY DATE INDICATOR DETENT- DATE CORRECTOR DATE INDICATOR DETENT SPRING' DATE CORRECTOR DETENT zr.
. Date Mechanism Disassembly r a. Remove dale spring by collapsing open end sufficiently trip arm until loop end is then be withdrawn from date bridge. rece«8 b. nhovr trip Remove date bridge Caution: with care Lift clear of its tO slide into recess. Spring may screws) (3 to avoid loss of date Indicator delenl spring c Remove date indicator detent spring, date indicator detent and date Indicator. arm and date d. Remove date e.
. 4 = ;• Replacing hour wheel, and hands. dial, a. Replace hour wheel and dial wnsher. b. Replace dial c Pull DIAL [2 WASHER screws). BOURWhm stem out (setting position), ad- ASSEMBLY vancer dial train slowly forward until dale indicator jumps to the next date. cL Replace hands exactly NOTE: It is necessary 12 o'clock. at lo support the center second upper cap jewel on a proper fitting staking set stump in a when replacing center-second hand. e. f.
u'. All other parts I same as basic series 218) cT ^ c--ic*~»
rriur»«nJ Crown location! . t).Jr Corrector Dclcul Scwrw ll Cciilur Whoul Aunpiiiljly -• 4 569 Dnlr flHM Minute ( Wli-.-l Aa-.-irihU • I ).»", Li" / / "K HourwhMl Amiably x, I .. 9 .v ImlicaiorDatent f »* o to* ll.
&* • Index Dial Removing, Basic 218 21 Removing, model 218D 43 Adjustment, indexing mechanism 15 Replacing, Basic 218 38 Replacing, model 218D 46 Disassembly 21-29 Disassembly, Date mechanism 45 Casing spring E Removing 22 Replacing 39 Rlcctronic circuit, testing 19 Case, closing 8 opening 3 Center-second brake Fourth bridge Removing 29 Removing 28 Replacing 33 Replacing 32 Center wheel assembly Removing 28 Replacing 33 Circuit, testing G Ground plate Removing 29 19 Cleaning 3D Replaci
... Index Index wheel 14.30.31 Indexing mechanism 14. 15-18 Service kit 9-11 12-13 Servicing chart Locking-ring wrench Lubrication Selling lever 1 Removing 29 31 14, Replacing 32 Dale mechanism 45 Selling wheel M Removing 27 Replacing 34 Magnetism 14 Microscope 2, Spedal 14 point!. 14 Special tools and Minute wheel Removing 27 Replacing 34 equipment 9 11 Stem M Removing 29 Replacing 32 Mod*l21BD Movement All-Af, Removing Tnim case Replacing in Site:.;.
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