Accutron Service Manual Series 214
Contents
1. Replace the four cot faim screws 7 Lift base OF t the Vertical pos low amd replace coll load retainer plate and screws Check position of the ead wires to make that the delicate Insula tion ll sat be damaged when coil retainer plate i screwed down 9 wer fork sarily and press try im plate Cave should be token apply pessu ouly at be tonat at The fork contact with the Liner YO Replace the two tuning tort finslacn shock bridge and shock bridge Cheek 1 see that fork 1 free to vate that the coils it ino the eas on the end f Ihe tines without touching and that contact with the tines al any polat In models that have na coil lad retainer plate the ubove steps should be performed in the following of fork 6 8 10 11 Also in step 8 make sure the three lend wires do not touch bose replacement dial train dial and hans Moisten center pinion staff with of and replace cannon pinion 2 Replace setting wheel Replace minute wheel 4 Replace selling whe spring min wheel spring and setting wheel spring screw RTI WU S Replace hour whee Replace Ta Waplace handy mien CAUTION Da mt um second centur ition forward oF forc It backward in Teplocing landi as this wil damage the mechani Replace the two dial Holding ut2. 1f the tuning fork magnets have lost most of their magnetism the tuning fork will fail to vibrate and the Test Set will indicate a very high current normally interpreted as due to a faulty electronic circuit If the magnets have lost only portion of their magnetism the tuning fork may yibrate but the Test Set will indicate that the current is above the OK area of the scale In each of these instances if an excessively high current and or failure of the tuning fork to vibrate cannot be corrected by replacing the complete coil assembly try substituting a different tuning fork 1f the tuning fork magnets have been demagnetized the fork must be returned to Bulova for remajmetizing rate recorder The ACCUTRON hour and minute hands are steel On some models de pending upon the length and design of these hands the tuning fork rate changes slightly when the hands are near the tuning fork magnets For this reason it is good practice to sot both hands im the lower portion of the dial before measuring the rate of an ACCUTRON timepiece with the Rate Recorder case gasket replacement The gasket which seals the water resistant ense is serrated to provide a definite amount of cushioning Tor the ACCUTRON movement in relation 10 the vase Never substitute a conventional non surraled water resistant gasket if the original gasket should require replacement crystal replacement Whenever an ACCUTRON timepiece is received fo
3. 72 Replace ground sirap and screw Check that ip of ground strap is 210 3 mim above surface of plilar piate Adjust penssan Replace salely bridge For simplicity of presentation the procedure of adding hands has been combined with other dial side operations In practice always replace dial holding nuts before hands TM 4 P gt casing the movement eae SETTING HANDLE POWER CELL COVER HATCH Replace movement in case 2 Replace gasket Replace back using care to insert the erd ofthe setting Rear mia the ole provided as indicated im the il straton As an m correct reassembly note that the back i provided with locating tah or key that fits flo a corresponding notch xcd m the case 4 Rotate the crows at least kalf turn to epsure that the square end of the setting stem engages the hote inthe setting 5 Put setting handle dom 6 Replace locking ring and tighten with wrench Check for waier resistance before Yo customer 28 REGULATION FOLLOWING REPAIR It is readily possible to return a repaired ACCUTRON timepiece to the owner pre regulated to keep time within one minute per month with rare exceptions if the proper facilities are available This requires that the timepiece be adjusted to lose two seconds per day in the dial up position for optimum performance when the owner wears it in normal manner
4. it is rarely necessary to replace the Coil Assembly during repair on ACCUTRON 17 the tuning fork vibrates an ACCUTRON problem is not due to a faulty Coil Assembly Higher than normal current variable current irregular timekeeping ete ure with very rare exception always caused liy other factors how to expose dering mechanism 18 indexing mechanism inspection and adjustment THE CHECKING OF THIS MECHANISM SHOULD NOT BE AT TEMPTED WITHOUT THE USE OF A SUITABLE MICROSCOPE A LOUPE EVEN OF HIGH POWER IS NOT SUITABLE FOR THIS PURPOSE The checking and adjustment of the ACCUTRON indexing mechanism is extremely important to its operation This is accomplished by closely controlling the alignment and the depth of engagement of the index and pawl jewels and their interrelation First the alignment of both jewels is checked and if necessary adjusted Then the engagement of the index jewel is checked and if necessary adjusted Finally the in terrelation between the two jewels is adjusted Details of the step by step procedure necessary to properly accomplish these adjustments are to be performed in sequence as follows 1 Loosen index guard screw and turn index guard away from index wheel Do not remove just turn out of the way being careful not to damage index and pawl fingers which run through the guard Tighten screw see Fig 9 2 Looking at the movement under the microscope make s
5. Hot sive illustration PARTS LI 108 an 131 Mo 1 I 100 las wi m ne ur w S Deseritian Wee and Pinion Minute Wheel Spring Paw Bridge and Finger Assembly Paw Pirot Screw Paw Bridge Cam Bre Lock Screw Par Pate Power Dall 214 Selety Hedge Sally Bridge Screw Sefer lor Lead Plate Seve Sorting Masel Spring Scan Wheel aad Pinion i aa Ses Stem Sting Won ferta Whee Spi Sng Wander hock hock Screw Spring T r No tar Indes Wheel n Second Wheel Third and Pinos op Bushing for Inday Wheel and Secon Wheel Toy Jewel for Comer Wine Top Jewel for Thi amd Fourth Wheel ya ridge orotate Train Bridge Seren Fork Asendy Tuning Fare Serew Replacement spore parts can be ordered from your Bulova Material Distributor Damaged subassemblies complete assembly Patt No 711 or tuning assembly Part No 716 should be returned to Material Sales Diaby Bur Match Company Flushing N Y 11370 for reconditioning 192 180 182 w 162 na n wm C ios ise qn ny 10 186 105 E aus 167 ls ne 1 ge er nm oe ar LI ML E en a e WOP LI maa a sse o U gt Stress limiter added 1954 35 INDEX 36 A Accuracy
6. of ACCUTRON 51 26 ignment index and pawi jewels 1415 c Case gasket replacement 32 Casing movement Center second pinion 8 Cleaning 2 30 Cleaning equipment 5 Coll and fork assembly removal 18 replacement a Coil izad retainer plate 20 25 Correct time 28 29 30 replacement 2 Current electronic circuit E D a Diagnosis 5 Dox jewels 2123 Slectosie circuit Electronic and electromagnetic components 1 Engagement index jewel 5 tine Exchanging dials 2 changing movements 30 G strap Hands dial train removal 18 replacement 5 Hints for repairman 30 1 Index finger post wrench 25 Indexing mechanism 1 checking after dialing a tow to expose 13 inspection and adjustment E wrench 25 10 Meckasical components Microscope Movement holder iting Opening case Operation of ACCUTRON Parts list Power cell 014 only Rate recorder Reassembly Regulators ACCUTRON Regulation Regulation following repair Remoring movement s Service kit ACCUTRON Servicing table Special and equipment Stress limiters Temperature effects current Test set Testing procedures Train checking for freedom Turing fork Tuning fork amplitude Tuning fork demagnetization Ultrasonic watch cleaner v Voltage power wW WATCHMASTER products Wear Wheel train 1 2 44 15 17 30 E 23 a0 328 52532 2
7. on the outside of the wrist When the owner wears it on the inside of the wrist the ACCUTRON timepiece should be regulated to gain two seconds per day in the dial up position for optimum performance in actual use If the ACCUTRON repairman has ateess to source of exact time check ing the 24 hour rate of gain or loss of a repaired ACCUTRON timepiece is relatively simple In this instance after casing the movement it is set approximately on time and its deviation from precise time recorded te the nearest J4 second After allowing it to run dial up for 24 hours it is again compared with the time signal and the amount gained or lost corded to the nearest 14 second The difference between the observed rate and 2 seconds per day for wearing on the outside of the wrist having now been established the calibrated regulators can be employed to make the necessary correction in rate see Page 12 The effectiveness of the correction should preferably be checked by again determining the 24 hour rate in the dial up position Obviously deviations of a second or so per day from the optimum rate can be allowed to provide timekeeping within the desired minute per month specified in Bulova s guarantee The difficulty in obtaining time which is accurate to the second as required for the above procedure is not always recognized by the watchmaker Con ventional synchronous electric clocks are suificiently accurate for checking conventi
8. that the hands will turn in exaet synchronism with the vibrations of the tuning fork Messuring the tuning fork rate will therefore indicate the amount the ACCUTRON timepiece will gain or lose in 24 hours This measurement of tuning fork rate is readily made with a Rate Recorder having special signal pick up device and eireuitry for printing a clear record together with a very precise internal frequency standard A Rate Recorder suitable for timing the ACCUTRON timepiece is available from WATCHMASTER Products Division of Bulova Watch Company Regulating a repaired ACCUTRON timepiece to the required rate 2 seconds per day dial up is a very obvious procedure using the Rate Re corder and the ACCUTRON calibrated regulating system Rate measure ments should be made only with the case tightly closed Also it is good practice to allow the timepiece to settle for an hour or more after last closing the case before making the final Rate Recorder measurement of its vate This avoids the small changes in rate which may occur immediately after casing as a result of trapped air ete See page 32 rate recorder 29 INFORMATION AND HINTS FOR THE ACCUTRON REPAIRMAN equipment DO NOT ATTEMPT TO SERVICE THE ACCUTRON MOVEMENT OTHER THAN REGULATION OR POWER CELL REPLACEMENT WITHOUT A SUITABLE MICROSCOPE AND THE ACCUTRON TEST SET CONTAINED IN THE REPAIR KIT exchanging movements to eorveet u prablem Bulova does not recommend exchan
9. the stress limiter away from index or pawl finger If adjustment is necessary use tweezers to bend stress limiter Fig 10 Pig 11 The lower surfaced of the index and pawl jewels must be parallel to Ahoir respective fingers shown on 11 Correction of this align ment ja rarely required It ean usually be accomplished if necessary without breaking the cemont attaching the Jowel to the finger by exer cising conalderable care Grasp the finger proper with Uweezers close to the jewel and press lightly on the end of the jewel or index finger in the proper direction with pogwood to eorrect the alignment of jewel and finger 4 Check the engagement of the index jewel by pulling back the tine of the tuning fork to whieh the index finger is attached seo Fig 12 Count the num ber of teeth the index jewel drops off before index jewel pulls away from the wheel sve Fig 13 THE JEWEL SHOULD DROP OFF 5 TO 8 TEETH If the number of teeth is smaller than 5 or greater than 8 the engagement ean be modified by gently bending the Stress limiter feature added in 1064 15 16 s T index fingor and stress limiter near the end where it is pisned toward or away from the wheel using the end of tweezers or A needle his operation is simi lar to that of bending a hair spring near the stud After thin adjustment the engage ment should be rechecked see Fig 13 Loosen pawl bridge Joc
10. 828 32 sa
11. Service Manual bey BULOVA TABLE OF CONTENTS Foreword Special Tools and Equipment Microscope ACCUTRON Service Kit Cleaning Equipment Rate Recorder Diagnosis SE 6 peu TAME E T 8 Procedures for Testing How to Check Power Call rs ds 9 How to Open Case and Remove Movement 10 Regulation a 11 Checking Electronic Circuit Eese O How to Expose Indexing Mechanism 1 E Indexing Mechanism Inspeetion and Adjustment Checking the Train for Freedom te ON Procedures for Disassembly eee emen 18 Now to Remove Hands Dia and Dial Trai 18 How to Remove Coil and Fork Assembly 19 veda LES DIES SE 2i 22 Procedures for Reansembly m 24 Replacement of Coil and Fork Assembly Replacement of Dial Train Dial and Hands soras 26 Casing the Movement 27 Regulation Following Repair 28 Information and Hints for the ACCUTRON Repairman 80 tomis registered temas of BULA WATE COMPA NE Al contained i be is based on Me laest product formation asa E fe ine ot pralina Th tt reseed ke changes any mt quf Tales Fi 10 1954 1909 Bulova Wate Company Ine AL rights reserved FOREWORD It takes years to train a watchmaker to repair an ordinary watch But any watchmaker should be able to lea
12. and operations which are familiar to the watchmaker This manual has been written to give you all the information needed to service the basic ACCUTRON movement Model 214 It has been ar ranged in way which will be of maximum value to you Additional information or assistance on specific problems is available from Tech nical Sales amp Services Division of the Bulova Watch Company SPECIAL TOOLS AND EQUIPMENT microscope The examination 01 the operation of the indexing mechanism is the most critical check in diagnosing trouble in the ACCUTRON timepiece The index wheel is extremely small 2 40 mm in diameter and contains 300 teeth which are 02 mm apart The jewels which engage with this wheel are 18 mm square by 06 mm thick These dimensions are small that microscope is necessary to obtain the level of magnification required to check the functioning of the indexing mechanism Any microscope of reasonable quality is satisfactory provided that It meets the following specifications 20 30 diameters magnification fairly wide field upright image at least 2 inches working distance Your authorized Bulova Watch Material Distributor stocks a relatively low priced Bulova Mieroloupe which i adequate for this purpose Note The typical biological or metallurgical microscopes are not sult able for this use because they have small fields short working distances and give inverted images ACCUTRON eic kit Fou
13. der and remove safely bridge See Fig 8 page 13 Place dial up on movement holder 4 Remove shock bridge which is held by one shock bridge serew 5 Remove the two tuning fork screws Place dial down on movement holder 7 Using a metal punch tap on the base of the tuning fork through hole provided in pillar pate unt fork i disengaged Pick up movement and holder and invert so that the movement is on the bottom Remove holder and place t under the movement how to remove coil and fork ussembly cont d Lift fork at the base and rotate up ward carefully until it is selta porting in a vertical position Remove the coll lead retainer ptite which is held by two screws 33 Lower fork carelily bot d mol torce down 12 Remove the four col orm screws 13 Without tuning over the movement remove the holder Irom the Hotton CAUTION USE EXTRA The nested bide of the holder as SPECIAL CARE WHEN in Fi 2 1 now placed REMOVING THIS SCREW over the movement and rotated until IN ORDER NOT 10 he ey of Ihe movement DAMAGE THIS WIRE holder oes Ihe moth at the edge ADJACENT oF the iir plate overt Te POINT ele sembly Moke iure 1 ily sealed in the move holder tise pugwood stick 10 pusty dawn ow coll assembly at severa pont dis mag The and ork assembly from the pillar plate The nested Molder is designed to receive th
14. e Auning fork and coi assembly with owt permitting the index finger t0 ouch the opening m the pillar plato during remo 15 The movement can then be removed rom the holder The coll and Fork assembly should be left in place in The movement holder unless if 18 necessary fo remove for cleaning or replacement in which case the cols be disassembled from the fork by gently spreading the apart E ay In sume movements the lead retainer plate is not used In this case the procedure for removal of the coil and fork assembly is much simpler merely perform the above steps in the following order 1 2 3 4 12 5 6 7 15 15 CLEANING The following additional disassembly steps should be performed only when cleaning is necessary 1 Remove pam bridge and finger av sembly by removing two screws The bridge cam is not threaded and will come out with the bridge Care should be taken to bend the finger 2 Remove the two Duofix jewels by applying horizontal pressure to the dosed side of the Ushaped spring allowing the lip nf the spring to emerge from under the bezel The spring ean then be tipped up and the cap jewel removed After the jewels have been removed the springs should be re engaged to pre vent their loss in cleaning 2 Remove center second chaton which i held by two chaton screws 8 Remove center second pinion and washer by grasping with t
15. e is danger of damaging the index and pawl fingers or the index wheel teeth Thus the safest and most convenient method of checking the train freedom is to pluck or twang the tine of the tuning fork to which the index finger is attached When this is done the fork will vibrate for a few seconds and this motion will be transmitted to the train if it is not blocked The motion of the train can easily be seen with a loupe or the micro scope watching any of the gears at the time that the fork is being plucked If no motion of the gears is apparent when the fork is plucked this is evidence of a blocked train assuming that the indexing linkage has al ready been heeked as is called for in the Servicing Table procedures 17 PROCEDURES FOR DISASSEMBLY how o remove hunds dial and dial train Je Remove ground sirap so move ment can be placed in holder 2 Remove the twa dal holding nuts Ex act location is shown 1 Remove hands using hand remover 1 Remove dial s 3 Remove hour whee A Remove cannon pinion 5 Remove setting wheel spring and wheel spring which are held by one setting wheel spring scr amp Remove minute wheel 7 Remove setting wheel CAUTION Do not tum second center pinion forward or force it backward in replacing hands as this will damage the indexing mechanism how to remove coil and fork assembly 1 Place dial down on movement hol
16. e simple check which will detect it With the movement running on the Movement Holder attached to the Tost Set press on the index upper endstone cap jewel with pegwood If there is no end shake the slightest pressure on the cap jewel will cause a significant inerease in the current Funetional cheek o xetting mechanism Gradually raise setting handle and turn the crown back and forth until minute hand moves meanwhile observing the distance the crown lifts Crown not setting handle should lift at least 14 mm before setting wheel engages minute wheel and hands turn If necessary change to longer stem to correct inadequate clearance between setting wheel and minute wheel Case part identification given on page 27 check adjustment of indewing mechanism after diating is always good practice to check the adjustment of the indexing mechan ism after replacing the dial and hands This is because the adjustment of the indexing mechanism can change a result of the slightest turning of the center second pinion when the hand is applied magnets partially demagnetized Diagnosis procedures in the preceding servicing instructions have not covered the identification of trouble caused by demagnetized tuning fork magnets for reasona of simplification Experience has shown that such trouble is very rare If the movement current is within the area of the scale on the Test Set the magnets are satisfactorily magnetized
17. ence and remove it ence in train cessive train friction Foreign materal If current is OK in 1 above and rate is many seconds per day stow Find Foreign matter and clinging to magnetic check for loose screw or other matter clinging to a tuning tork remove same elements magnet Indexing mechanism AF current is OK in 1 above indeting mechanism may be out of Check and readjust indexing mechanism maladjustment adjustment necessary pages 14 thru 17 Dirt in index wheel If cures and indexing m chanism adjustment have been found Clean entire movement teeth correct there may be det in index wheel teeth page 20 SPECIAL POINTS Because of the unusual and somewhat unfamiliar nature of the ACCU TRON mechanism there are certain areas in which extreme care should be exercised Attention is called to these precautions in the various applicable sections of this manual but in order to emphasize their im portance they are listed again below 1 In removing the hands care must be taken not to turn the center second pinion forward or force it backward since this will damage the indexing mechanism 2 The post finger and jewel assemblies on the tuning fork the index finger and on the paw adjusting bridge the pawl finger are very delicate Handling of these assemblies should be kept to minimum and should be done when necessary with great care If either finger is damaged or if either jewel is separated from
18. for the regulation proce dure The movement can now be removed from the Regulation can be accomplished with out taking the movement out of the case or removing the Power Cell Lookin Xx POWER CLA COVER serine intr regulation THE BASIC ACCURACY OF ACCUTRON IS 50 GREAT THAT REGULATION FOR MORE THAN A FEW SECONDS PER DAY IS NOT REQUIRED GAINS OR LOSSES OF AS MUCH AS A MINUTE A WEEK INDICATE THE NEED YOR SERVICING NOT REGULATION ACCUTRON regulators The ACCUTRON regulators sce Fig 7 page 12 are serrated to make them easier to rotate and to serve as a calibration The serrations of each regulator form 7 divisions 4 projections and 3 indentations Each of these divisions is equal to 2 seconds per day of correction in other words rotating one of the regulators a distance equal to one division changes the rate of the ACCUTRON timepiece by 2 seconds per day Regulation for as little 44 second per day be made by rotating of the regulators division The amount that regulator is rotated can be easily gauged by reference to the dot on the top of each Tn order to allow greater latitude for regulation either one or both of ihe regulators can be rotated in making a correction for example a correction of 4 seconds per day can be made either by rotating one reg ul tor 2 divisions or by rotating each of the regulators 1 division S
19. fork is mechanically blocked The procedures shown in the Servicing Table on the next page further narrow down the possible choices until the correct source of the trouble is found This table which is self explanatory covers most of the servicing situa tions that will normally arise The first column lists the symptoms the second column the possible sources of trouble which could cause this particular symptom the third column details the procedure that you should follow in determining which of the possible causes is the correct one and the fourth column lists the corrective steps to be taken when the malfunction is isolated Abnormal wearing habits or Improper regulation Regulate page 11 Exhausted Power Cell Check Power Cell voltage page 9 If low or no voltage Power Cell Replace Power Gell 1s exhausted electronic It voltage is somal check current page 13 I no current elec Replace complete aqsembly tronic circuit amp faulty Aart No 713 Mechanica blockage current high check if tuning fork js blocked Find blockage and remave it of tuning fore Faulty electronic AM blockage of turing fork electronic circu 1 faulty Replace complete coil astembly mut art Wo 712 sored Exhausted Power Cell Check Power Cell voltage 9 If voltage is low Power Cell is Power Gell sey mailed second hand ttu 2 Indexing mechanism M voltage normal open case rem
20. ge of movements to solve a eustomer s problem The ACCUTRON movement unprotected by the case can be readily damaged or its functioning seriously disturbed The repairman who Jacks the necessary equipment and knowledge to diagnose and repair the trouble with am ACCUTRON movement etn rarely satisfy the cus tomer by switching movements This usually results in two problem mave ments and one very dissatisfied customer irregular timekeeping Reports of irrogular ACCUTRON timekeeping where the timepiece ap pears to jump fast one day then slow the next are almost certain indica thatthe timepiece was checked against an inaccurate time standard See discussion on Page 28 Alwaya be sure the trua nature af the enstomer s problem is understood before attempting to correct it by repairing the movement power cover contact spring Before attempting movement repair always examine the contact spring on the Power Cell cover to be certain it makes gond electrical contact with the Power Cell These springs are occasionally damaged by carelessness doring Cell replacement causing a problem which for obvious reasons cannot be corrected by movement repair 1 cleaning The practice of cleaning a watch as a routine part of nearly every repair results from the watchmaker s knowledge that optimum performance and reliability can be expected only when lubrication is fresh The performance of ACCUTRON is relatively unaffected b
21. important adjustment and test ing outlined in this manual The notch in the side of the Movement Holder is designed to accept the spring clip for attaching the Test Set and Voltage Supply to the move ment Fig 8 shows the spring clip correctly attached to the movement and the Movement Holder Fig s locking ring wreneh Because of the convexity of the back of the ACCUTRON timepiece a conventional Jocking ring wrench may not be suitable for opening the case of water resistant models A special wrench designed for this pur pose is illustrated in Fig 4 index finger post wrench This special wrench illustrated in Fig 5 is used in the alignment of the index fingers It is placed over the end of the index finger post on the tuning fork tine and gently stressed to canter the index jewel on the index wheel by slightly bending the index finger post Rig 5 cleaning equipment Ultrasonic cleaning of the mechanical section of the ACCUTRON move ment is strongly recommended The infinitesimal size of the 300 teeth on the beryllium copper index wheel requires the maximum penetration power available in ultrasonic cavitation generated by nickel transducers The WATCHMASTER Ultrasonic Wateh Cleaner is recommended It was used exclusively during the development of the ACCUTRON time pies vate recorder The true rate of the ACCUTRON tuning fork be recorded only on equipment specifically desig
22. ince there are 7 divisions on each of the regulators and since each divi sion is equal to 2 seconds per day it would be impossible to make a cor rection of more than 28 seconds per day even if both regulators were originally set all the way in one direction which they will not be 22 how to regulate 1 Open case page 10 steps 1 through 4 With pegwood stick rotate or both of the regulators see Fig 7 sufficient number of divisions and in the direction necessary to make the 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 to run faster For reassembly following regulation refer to page 27 steps 2 thru TO REGULATE 2 SECONDS PER TO REGULATE 2 SECONDS PER DAY SLOWER MOVE EITHER REG DAY FASTER MOVE EITHER REG ULATOR ONE DIVISION OUTWARD LATOR DIVISION INWARD AS SHOWN AS SHOWN OBSERVE THE SEVEN DIVISIONS EACH REGULATOR Rig choeking electronic circuit The ACCUTRON movement itself is your test fixture and the best means of testing electrical and mechantey capabilities Testing the electronic cireuit requires you to 1 Take the movement out of the ease refer to page 10 Inspect for and eliminate mechanical overloading and or obviuws tuning fork blockage 2 Place the movement dia side down iu the Moveme
23. ition 1 CHECK POWER CELL Position 2 OFF Position 4 READ MICROAMPERES Position 4 LOW AMPLITUDE In this position the Test Set pro vides am accurate source for the reduced voltages required for the in doxing mechanism adjustment in both the 214 and 218 ACCUTRON movements the two voltages are not the same 2 wire lead with tab end and a plug end for attachment to the 218 ACCUTRON movement and movement holder s A 2wire lead with a spring clip for attachment to the 214 ACCRUTRON movement A black screw directly below the center of the movement dial for zeroing the meter hand movement holder Because of the unique construction of the ACCUTRON timepiece it is essential that a special Movement Holder be used A specially designed holder has been developed to fit the ACCUTRON movement and to pro tect the tuning fork and coil assembly during servicing procedure A CLAMP TYPE MOVEMENT HOLDER SHOULD NOT BE USED WHEN ADJUSTING THE 211 INDEXING MECHANISM The Movement Holder Fig 2 is used when removing the fork and coil assembly One side of the Movement Holder contains a nest designed to receive and protect the fork and coil assem bly The Holder is keyed as shown in Fig 2 so that the movement will remain in the correct posi tion Using the Movement Holder simplifies the handling of tuning fork and modules and the complete movement during the
24. its finger the entire assembly must be replaced The jewels carmot be re cemented or the fingers replaced except in the factory 3 The teeth on the index wheel do not wear away unless the train has been blocked in some manner for an extended period In this case a tooth can be worn off by the constant rubbing of the index jewel at one spot on the wheel Other than this the index wheel can only be damaged by improper handling of the movement when it is not pro tected by the timepiece case Unfortunately if an index wheel has been damaged during servicing or by a Stalled train this cannot be confirmed by visual observation with the recommended micro scope Furthermore the purchase of a high power mieroseope with suitable fixturing and illumination for examining the teeth on the index wheel is rarely warranted because of the cost factor If it is suspected that the teeth on the index wheel have been damaged the most practical solution is to replace the wheel and pinion assembly Part No 119 In this case to avoid damaging the teeth always handle the assembly by the pinion and in no case grasp the edge of the wheel with tweezers 4 In removing the complete coil assembly care should be taken to avoid damaging the insulation on the connecting wires or piercing the insulation on the coils Do not demagnetize an ACCUTRON movement or expose it to any high strength magnetic field Anything which will affect the per manent magnet
25. k serew slightly leave pawl bridge pivot seyew tight Disengage paw jewel com pletely by rotating pawl bridge vam until the end of the bridge is at its maximum din tance away from the index wheel see Fig 14 Then ox amine the paw jewel under the mWeroscepe It should not be touching th index wheel and mot more than onetalt its thickness away from the wheel This distance may be adjusted by prossing gently in or ovt ho pawl finger us described above in adjusting the index jewel engagement Fig th With the Power Cell in the newt on the Test Set turn the rotary switch to the LOW AMPLITUDE position Attach the Test Set to the movament with the spring chp See page d Fig 3 When the spring clip attached to he movement the fork ahould begin to vibrate If it does not this will be indicated by an excess current reading on the moter of the Test Set Should this occur tap the movement and the fork will start decreasing the current reading to the lower end of the OK area or slightly below Rotate the cam very slowly in dither diveetion since It was at its maximum distance away rotating either clockwise or counterolock wise will move the pawl toward the wheel until the movement begins to run This can be seen without the microseope merely by watching the wheels that are visible Turn the vam farther in the aime direction until the train stops and then euntinue still farther until y
26. lacked this slip eluteh IF was later introduci 1 avoid critical adjustment of cannon inlon oniter arbor friction 3 Depress center wheel wil stick Using smal nilar light al between center wheel and cluteh fate see illustration a left CAUTION Be careful not to oll center bridge If oil first touches center bridge i wil remain on bridge and clutch face wil mot be oiled PROCEDURES FOR REASSEMBLY following oiling reassemble as follows Replace lower jewel plate Replace center second pinion and washer placed under the spring and the lip reengaped 5 Replace paw bridge cam Do not push the way 5 Side forked end of pawl bridge under head of cam and position pawi 24 replacement of coil and fork assembly Place and fork assembly inta the prepared slots in the movement 2 Poution pilar plate over the ax samby making sure noch it plat alate engagez key movement kam movement holder o that pil ar plate wil not drop ut Nm over and press through holes Ip buch partially seat the assembly m tho pilar otste 4 Transter pilar plate and coil and fork assembly from one side of the move holder o the other placing i n the Gab sides positon replacement of coil and fork assembly eont d 5 Press ily on form only Io mabe sure is completely and evenly seated n pillar plate
27. ned for that purpose A special transistorized amplifier with suitable frequency dividers has been developed by Bulova engineers to show this true rate This ACCUTRON Rate Recorder will also record popular odd beat spring driven and electric watches By printing comparative graphs it will greatly assist in the sales effort of fine timepieces NOTE For further information on the ACCUTRON Service Kit the ACCUTRON Power Cell Tester the WATCHMASTER Ultra sonic Cleaner or the Special ACCUTRON Rate Recorder write to Technical Sales amp Services Division Bulova Watch Company Ine Bulova Park Flushing N Y 11370 Not shown in this publication DIAGNOSIS The initial step in the servicing of any timepiece is preliminary de termination of the symptoms Let us assume that a customer has brought in an ACCUTRON timepiece to you Unless there is a broken crystal catching hands or similar obvious defects it is important to obtain a clear statement from the owner regarding the symptoms which caused him to bring the ACCU TRON timepiece to you for repair Such symptoms will probably fall into one of the following categories 1 Gaining or losing a few seconds per day 2 Gaining or losing an excessive amount or more minutes per week Stopped We differentiate between Nos 1 and 2 because unlike ordinary watches where gains or losses of large amounts can be corrected by regulation ACCUTRON is so designed tha
28. nt Holder with the Power Cell recess adjacent to the noteh in the side of the holder On some models the dials and hands will have to he remaved With a Power Cell im the nest of the Test Set ennnert the spring clip at the end of the lead to the movement so that the center finger is touching the contact in the center of the Power Cell recess The other two fingers should be spring tight in the pillar plate see Fig 8 a urn the Test Set rotary switch to READ MICROAMPERES position The Power Cell is now connected to the movement through ihe Test Set and the meter will give a reading of current on the left hand seale It may be necessary to tap the movement lightly to start the tuning fork vibrating after connecting the spring clip The current reading should be in the area of the scale 4 5 t 1 0 microamperes 5 Lf the movement is warmer than room temperature as a result of exposure to the direct rays of the bench lamp or from being held in the hand this may cause a higher than narnial current If the read ing is slightly higher than the area let the movement sit for 4 hour at room temperature away from the direct rays of any lamp and again check the current NOTE Mechanical interference caused hy improper adjustment and or any factor such as lint which restricts or work loads the fork may alsa result in abnormal Test Set readings Unless the circuit is open current reads vero
29. onal watches but may vary throughout the day from several seconds fast to several seconds slow They are therefore unsatisfactory for checking the true 24 hour rate of ACCUTRON The Western Union clocks used in many jewelry stores in the United States are similarly unsatis factory for checking the 24 hour rate of ACCUTRON timepieces These clocks are automatically corrected hourly from a master clock which is manually set to a time signal provided once each day by the U S Naval Observatory While they are always approximately correct errors great as 15 30 seconds are relatively common The hourly beeps broadcast by some radio and television stations are not necessarily correct to the second and should not be used for checking the exact performance of ACCUTRON timepieces There are a few areas in the United States where a precise time signal accurate to the second is available from the telephone company Except when such signals are available accurate time for checking and regulating ACCUTRON timepieces can best be obtained with a short wave radio receiver Such a receiver can be used to receive the precisely controlled time signals broadeast continuously from government operated short wave radio stations A special Rate Recorder provides the most satisfactory solution to the problem of regulating an ACCUTRON timepiece following repair The repair and checking procedures covered in the preceding sections will assure
30. ou reach the point where it starts again and continues ty ran momentary hesitation permissible With Test Set at low amplitude tighten pawl bridge lock screw and check the tightness of the pawl bridge pivot screw to assure that the bridge is rigidly clamped in position The ACCUTRON train should continue to If it does not the adjustment must be made again At this point the adjustment is complete 10 Disconnect the Test Set spring clip from the movement 1 Loosen index guard screw and turn index guard back into position being careful not to damage the index finger or pawl finger Tighten serew Using the microscope tip the movement into a suit able position and observe the clearance between the index finger and the guard With the guard in position the index fin ger should pass through a point slightly inside the center of the slot in the guard see Fig 15 The index finger should not touch either side of the slot If it does bend the guard up or down slightly to center the index finger making sure also that the pawl finger does not touch the guard Fig 15 12 Replace safety bridge and safety bridge serew checking the train for freedom This cheek is used in the procedures described in the Servicing Table to determine whether there is any mechanical blockage of the year train The freedom of the train could be checked by simply moving one of the gears with a tweezers or needle but ther
31. ove movement page 10 expose mechanism if but fork maladiustmont indexing mechamun page 13 and examine under microscope Check necessary agos 14 thiu 17 un index jewel engagement pages 14 and 15 steps 2 and 4 Mechanical blackage M jewels appear normal check train freedom pago 17 Traw may Find mechanical blockage and of train be block ramova it Dirt on index wheel M Arain is Tre and indek jewel engagement carret tap movo wan wie movement as described ment lightly with pencil 10 increase fork amplitude while observing on page 21 in cleaner Closely with loupe If index wheel rotates and then stops again his is evidence of dirt on index wheel tooth j Damaged teeth on V symptoms persist attor cleaning index wheel has been domaged Chango dex wheel des wheel OR 1 Tuning fo Wat Fee pen cate remove movement page 10 and chech current page 12 1 foreign matter i served remove LOSING M current too high examine for obvious foreign material interfering same and rocheck lo see that with tree vibrations al tuning fork current normal M current tno high and nn evidence tuning fork Is not fret expose Replace complete coil assembly Indexing mechanism page 13 disengage pawl jewel item pape Port No 7H 16 and check current again current remains high coll assembly detective Mechanical interfer M current dropa within range or below In 2 above cause is Find interfer
32. r repair with the crystal missing always check the adjustment and operation of the indexing mech anism which could have been deranged by any interference with the ex posed sweep second hand exchanging dials Interchange of dials to satisfy a customer s request for non standard combination of ACCUTRON dial and case is hazardous Dial curvatures and bezel openings vary from style to style and different dials are there fore not necessarily interchangeable ACCUTRON WA GI ae 4 screws not shown gt Sell nding movoment gt E screws not shawn A De comparison of ACCUTRON with self nnmding movement Desorption Cannon Pinion Cap lewe to Top Bushing for incer Wheel and Second Wheel enter Bridge Center Bde Scie Center Second Brake Sprik Center Second Hand Canter Second Pinion and Washer Contar Wheel and Arbor Chalon for Center Second Pinion Chaton teme Cal Fann Stew Coll Lond Retaining Plate Complete Holding hol Fourth We and Pinion Stn Ground Shep Sp Mow hewal lor Bui dor Pest bani iud Wow Hand Mawr Whee index Quai Angon Gund Soraw Aer rd Wash Aner We and Pinn Lower devel fa ettet Whe Loo eel for indov hel and Sect Whine Lower Jewel Yor Third and Fourth Wine ower Jewel Plate owes jewel Plate Screw Minute Han
33. r special tools have been designed by the engineering staff of the Bulova Wateh Company Inc to perform diagnosis and to service the 214 ACCUTRON times These tools ure included in the new Autho rized ACCUTRON Service Kit special triple purpose electric Test Set z A molded plastie Movement Holder special Locking ring Wrench 4 An Index Finger Post Wrench Each item will be deseribed pages 3 5 and its use fully explained and illustrated in the sections of this manual covering diagnosis and servic ing disassembly and reassembly test set The Test Set illustrated in Fig 1 is an essential unit in servicing the ACCUTRON movement The Test Set is required to perform three very important funetions 1 IL is used as voltmeter to check the ACCUTRON Power Cells 2 It is designed to check the current in the electronic circuit to indicate its operating condition Conventional high resistance microamme ters are not suitable for this purpose 3 It provides accurate source of the reduced voltage required for the adjustment of the indexing mechanism wig The Test Set provides 1 A nest to hold a Power Cell during testing The nest is clearly marked for proper insertion of the 214 Power Cell 2 A meter reading either volts or mieronmperes indicating the correct values by areas marked OK A 4 position Rotary Switch for the selection of the various test con dition Pos
34. rn to service the ACCUTRON movement in a matter of hours with the aid of this manual the information a watchmaker needs to perform the diagnostic and serv ice operations on ACCUTRON is contained in this manual study it thoroughly There are certain ways in which the servicing of ACCUTRON differs from familiar watchmaking practices In the first place there is no necessity for preventive maintenance Secondly an extremely precise method of diagnosis and testing has been devised and should be followed in determining the cause of the malfunction There are two general areas of operation in the ACCUTRON movement the Mechanical components consisting of the indexing mechanism and the gear train and the Electronic and Electromagnetic components consisting of the Power Cell electronic circuit and tuning fork The purpose of the method of diagnosis as described in this manual is to localize the source of trouble The indexing mechanism which transmits the motion of the tuning fork to the gear train and forms a most important part of the Mechanical area of the ACCUTRON movement contains parts so small that their functioning cannot be checked with a loupe Consequently a microscope must be used for this purpose If the microscopic examination discloses need for adjustment it can usually be accomplished with the lower magnification of a loupe With the exception of the above the servicing of ACCUTRON generally utilizes skills
35. s on the tuning fork will seriously affect the opera tion of the timepiece See page 32 If necessary to remove the tuning fork from the ACCUTRON move ment as in cleaning keep the fork away from anything made of steel tools containers watch parts ete The magnets on the tuning fork are extremely powerful and will have a tendency to attract small articles and be attracted to large articles either of which may damage the fork 7 Never oil the teeth of the index wheel or the index or pawl jewels s Never bend the tines of the tuning fork Bending this part will seriously affect its timekeeping ability If the tines become mis aligned or the fork is damaged in any way it must be replaced PROCEDURES FOR TESTING how to ther 215 power cell Before any other work is done check the Power Cell to make sure that it is functioning properly Wipe the back of the case to remove any loose material near the Cell cover to prevent the entrance of dirt when the cover is removed Unserew the Cell compartment cover using a U S dime 3 Turn the timepiece over and the Cell will fal out Place the Power Cell in the nest of the Test Set with the smaller diameter down s Turn the rotary switch to CHECK POWER CELL position Read the Power Cell Voltage on the right hand seale The voltage reading should be in the OK area of the scale 125 to 1 45 volts If itis the Power Cell ia in satisfactory opera
36. t the usual wearing conditions or environ mental effects will rarely affect timing more than a few seconds per day An ACCUTRON timepiece which gains or loses more than a minute week probably requires servicing not regulation There is one symptom that you should look for in your preliminary exam ination if the timepiece is stopped be sure to listen carefully to deter mine whether or not the characteristic hum is audible The method of diagnosis consists of procedures whereby you progres sively narrow down the areas of possible malfunction Having determined from your own examination or the customer s description whether the timepiece is running b how much it is gaining or losing and c whether the hum is audible you are already on your way toward localiz ing the source of the trouble For example if an ACCUTRON timepiece is brought in to you and upon examination you see it is not running but the characteristic hum is audible you can conclude that the electronic circuit is operating and the fork is vibrating Under these conditions if the Power Cell voltage is proper this means that the source of trouble is probably somewhere beyond the fork perhaps in the indexing linkage or in the gear train which connects the indexing mechanism with the hands On the other hand if the hum is not heard this is an indication that there is probably some malfunction in the Power Cell in the elec tronic circuit or that the
37. ting condition Note Poor electrical contact between Power Cell and Test Set will cause either a low reading or a wavering indication of cell voltage It can be readily avoided by making certain that Cell surfaces and contacting points of the Test Set nest and elip are clean Rubbing or twisting a suspected cell between the contacts while checking voltage ia good practice A wavering reading of voltaxe is always an indica tion of poor contact not an indication of a bad coll Testing should always be done with the authorized ACCUTRON Test Set or with a high resistance voltmeter having not less than 10 000 ohms per volt sensitivity such the ACCUTRON Power Coll Tester CAUTION Use only cells imprinted ACCUTRON 214 see picture above in this model timepiece Cells marked ACCUTRON 218 will not operate the Series 214 movement Substitutes such as type 400 hear ing aid cells should never be used since they may leak and seriously damage he movement Their internal construction and electrolyte differ from that in the genuine 214 cell Not hoon in this publication 10 how to open case aid remove movement special Locking ring Wrench loosen locking ring 2 Remove locking ring 3 Lift setting handle to aid in removing back Lift off back being careful to lift straight up If gasket ix pulled up in lifting back remove it If gasket remains in it not neces sary to remove it
38. ure that pawl jewel is engaged with index wheel The pawl jewel must be engaged with the wheel so that during the check for engage ment of the index jewel Step 4 below the wheel will not back up If it is not en gaged rotate pawl bridge cam until paw is brought in com tact with wheel Under the microscope check to be sure that each finger is straight that both jewels are centered on wheel that both are neither too high nor too low and that each is perpen dicular to wheel see Fig 10 If index jewel is not centered this can be corrected by the use of the Index Finger Post Wrench which fits on the index finger post located on one tine of the tuning fork Plucing the wrench over the end of the post gently stress it in the proper direction to center the index jewel on the wheel by bending the post The pawl jewel ean be centered by bend ing the pawl finger post with tweezers Tf either jewel is not perpendicular to the plane of the wheel Fig 10 this can be corrected by grasping the jewel finger and stress limi ter close to the point where it is pinned with tweezers be careful not to touch the jewel itself and twisting slightly Observe the stress limiters on i dex and paw fingers see Fig 10 Check that no more than 14 of the length of the stress limiter is in contact with the index or pawl finger Also check that end of stress limiter is no more than 3 thicknesses of
39. weeters and lifting out through hole in tra bride 1 Remove lower Jewel plate which ix held by one screw tisaxsembly af the wheel Wain is wunecessary water ordinary eanditions Ultrasonic equipment is necessary for cleaning the ACCUTRON movement Tt should be treated exactly as any fine wateh with one exception The electronic circuit the tuning fork and the pawl adjusting bridge should not be cleaned in ultrasonic equipment because of the possibility of danger to delicate parts The fork coil and pawl bridge can be cleaned satisfactorily by merely dipping into a benzine and then placing on a tissue to dry Care should be taken to prevent metal chips which may be present in the cleaning cup or on the bench from being attracted to the permanent magnets on the tines of the tuning fork Inspect the fork carefully after cleaning and if this has occurred any particles that are clinging to the mag nets can be removed with masking tape No particles should be left adhering to fork magnets 21 OILING following cleaning the ACCUTRON movement should be oiled as follows Te Oil all Hain wheel pivots and cap jewels 2 Using small oiler lightly olf suce between center wheel slip amd center wheal alto b Tween spring and steel hub on ler arbor see ilustralon al lel CAUTION Never oil index wheel tret Aor index and jewel SAGCUTRON moverent of very mamilaclhue
40. y the condition of the lubrication Cleaning will not usually be required to restore an ACCUTRON timepiece to proper operating condition j oiling The instruction to oil sparingly is repeated here for emphasis Flooding the various bearings can result in oil running onto the teeth of the index wheel In this instance oil attracts and holds any dirt or foreign matter the case which may then interfere with proper operation of the index ing mechanism This trouble is rarely experienced if the bearings are viled properly removing and replacing the tuning fork The tuning fork should never be pried up during removal by inserting screwdriver or other tool under the tines This practice will bruise the tines and permanently affect the tuning fork rate usually requiring replacement with a new tuning fork to restore timekeeping Use the knock out hole provided to push the mounting tongue off the two dowels In removing and replacing the tuning fork and coil assemblies use care to avoid damaging the insulation on the connecting wires which pass under the base of the tuning fork index wheel endshake Insuficient endshake of the index wheel pinion in its bearings can cause the index wheel to fail to draw back reliably after each operation of the indexing mechanism This results in the timepiece gaining excessively While this condition is rare it is good practice whenever checking the movement to perform th
Download Pdf Manuals
Related Search