Service Manual for Stepping Motor Quartz (S.M.Q.
Contents
1. If Motor turns d tension Proceed Step 4 Carefully lift Center Second Motor Check Tension Spring If Motor still does hesitates remo Lift the clip from allow 2 seconds to recover anc other Motor lead should again ind Continue alterna from one Motor at 2 second inter With Meter still at LOW AMPLITUDE remove Black Clip from Lower Contact Spring and touch it to the bare area of one of the Motor leads close to the screw See Fig 7 Pg 5 Motor gear should index one tooth If maximum read microampe ci Step 5 If removed in Step 4 return Black Clip to Lower Contact Spring Set Meter Selector to READ MICROAMPERES Pointer will fluctuate This is normal Current Check If maximum reac NOTE CHECK ACCUSET FUNCTION AS DESCRIBED ON PAGES 4 AND 5 Note It is imperative that the basic step by step em procedure be strictly adhered to beginning with Step 1 and continuing through Step 5 Rate O K or regulate if necessary Proceed to Step 3 If Rate is still not correct replace Quartz Crystal Return original circuit board to your Stock Motor turns without hesitation ic Circuit Board 4e Meter Clip to ittachment ellow Meter ed Yellow Red Attach Strap Upper Attachment act Spring 3 fluctuating ee Page 3 ecreas2. 20 761 02 Parts List for Model 2421 10 PART NUMBER PART NAME 10 020 Main Plate 10 048 Train Wheel Bridge 10 048 01 Train Wheel Bridge Screw 10 106 Dial Supports Diameter Height 10 106 1 26 85 40 10 106 2 28 35 40 10 106 3 30 35 40 10 513 Electronic Circuit 10 513 01 Electronic Circuit Screw 10 513 02 Electronic Circuit Ground Screw Use 10 048 01 10 580 Electronic Unit Support Bridge 10 580 01 Electronic Unit Support Bridge Screw 20 510 Stepping Motor 20 510 01 Stepping Motor Screw 20 570 Power Cell 20 652 Insulator for Contact Spring 20 701 Battery Support 20 701 01 Battery Support and Contact Spring Screw Use 10 513 01 20 701 02 Battery Support and Cell Strap Screw 20 761 Power Cell Strap 20 763 Contact Spring 30 012 Intermediate Double Wheel 30 025 08 Third Pinion 30 051 Drive Wheel over 3rd Pinion 30 081 Sweep Second Pinion Height 5 80 31 041 Minute Wheel 31 046 Hour Wheel Heights 1 71 or 1 42 31 083 Cannon Pinion with Driver Heights 2 35 or 2 60 31 100 Set Wheel 31 102 Motion Work Set Wheel 31 124 Hand Set Pinion 40 510 Resonator Quartz 40 700 Resonator Cannister Retaining Clamp 51 020 Hand Set Stem 51 052 Rocking Bar 51 080 Set Lever with Axle 51 090 Set Lever Bridge Jumper 51 090 01 Set Lever Bridge Screws 56 070 Stop Lever 60 131 Second Pinion Friction Spring 61 101 Rocking Bar Spring 61 101 01 Rocking Bar Spring Screw 61 241 Hour Wheel Friction Spring Use Dial Washer 7 AK 86 3
3. 1 ACCUTRON QUARTZ Service Manual for Stepping Motor Quartz S M Q Series 242 Table of Contents Page Introduction to the Basic Electronic Function of Bulova Accutron Quartz Series 242 2 3 iloolsraudiEquipmerntte ups 3 CIOWNEROSIUON Se 4 4 Checking the Frequency 4 Setting Instructions and Synchronizing Electronic ACGUSETSSGIEKCUItU P NE 4 Using the ACCUSET Gorre t r 5 US E E eS 5 Cleaning and Lubrication 5 RUD GI CANIS uu a as tee en orm RR RU NO 5 Mechanical Check Points 5 ElectinicaliGheck 5 ACCUSEMGontact Checks 4 5 SOCOM GMM eese 5 Basic Test Procedure for S M Q Series 242 6 7 Gheckingsthercomponentex ee elhe 8 Removing the 5 8 Electronics CITGO n 8 Resonator Quartz Cannister with Nest 8 SHENG Moto 612 1 8 e 8 Settingalnstmuctionss l s SL 5 8 Parts Assembly Sequence for Series 242 8 9 Parts List for Model 2421 10 9 Parts List for Model 2422 10 10 Parts List for Model 2423 10 10 Parts List for Model 2426 10 10 lllustratediPants 5i9St 11 Notes o EE ee eun
4. PART NUMBER 10 020 10 106 10 106 1 10 106 2 10 106 3 13 101 13 101 01 30 081 31 046 31 083 33 014 33 028 33 102 36 051 36 052 51 052 53 201 91 440 91 441 PART NAME Main Plate Dial Support Diameter Height 26 85 1 35 28 35 1 35 30 25 1 35 Calendar Mechanism Maintaining Plate Calendar Mechanism Maintaining Plate Screw Sweep Second Pinion Height 6 75 Hour Wheel Heights 2 12 or 2 37 Cannon Pinion with Driver Heights 3 30 or 3 55 Intermediate Calendar Wheel Calendar Driving Wheel Pinion of Day Corrector Corrector Setting Wheel Day Corrector Intermediate Setting Wheel Day Rocking Bar Day Corrector Date Indicator Day Indicator BASIC MODEL 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 Parts List for Model 2426 10 Varying From or Addition To Model 2421 10 PART NUMBER PART NAME MODEL 10 020 Main Plate 2426 10 106 Dial Support pe Diameter Height 10 106 1 26 85 1 35 2423 10 10 106 2 28 35 1 35 2423 10 10 106 3 30 25 1 35 2423 10 13 101 Calendar Mechanism Maintaining Plate 2426 10 13 101 01 Calendar Mechanism Maintaining Plate Screw 2423 10 30 081 Sweep Second Pinion Height 6 75 2423 10 31 046 Hour Wheel with Spring 2426 10 31 048 Hour Wheel with Star Heights 1 70 or 1 95 2426 10 31 083 Cannon Pinion with Driver Heights 3 30 or 3 55 2423 10 33 014 Intermedia
5. time standard being used Then gently turn the minute hand back to correct time If P M advance the hands past 12 o clock noon to 5 minutes ahead of time standard and then gently turn the minute hand back to correct time Step 5 When time standard being used reaches the 60th second mark 12 o clock marker push crown to the intermediate position Position 2 All hands will start instantly Step 6 First set the date then the day Crown must remain in Position 2 Slowly turn crown forward to correct date backward to correct day Push crown in Position 1 Note Day Indicator is printed in English and Spanish or English and French Set accordingly Calendar cannot be set manually between 9 00 P M and 1 00 A M However the mechanism will not be damaged if crown is accidentally turned during this period of time Additional Setting Information Once the ACCUSET circuit has been set Refer to lt Step 1 and Step 2 there is no need to reset it unless the power cell has been removed or there has been an interruption of current Using the ACCUSET Corrector After a period of time if the watch is no longer accurate to the exact second press and release the ACCUSET button the instant the t me standard used reaches the 60th second 12 o clock marker Maxi um correction is or 30 seconds The sweep second hand of the watch will temporarily stop if it is fast or accelerate if it is slow until it is in synchr
6. 2423 10 2426 10 Quartz Frequency 32 768 Hz Cycles per second Electronic Circuit C MOS Integrated Circuit one second signal increments Stepping Motor Bipolar 12 steps per revolution Cell One Silver Oxide Battery 1 55 V 242 Note photographs of units are not to actual size Power Consumption Max 7 5 Microamperes Normal Running Max 3 0 Microamperes Disconnect Position 3 Disconnect System When the stem is pulled out as far as it will go Position 3 the motor and hands stop but the Resonator 242 QUARTZ Quartz continues to vibrate without affecting the MOVEMENT synchronization of the electronic ACCUSET circuit ACCUSET A device that corrects the second hand by merely depressing a push button The second hand is reset automatically to the time standard 9920 6603 ACCESSORY Displays Model 2421 10 Hour Minute and Sweep Second Model 2422 10 Hour Minute Sweep Second and Date Model 2423 10 Hour Minute Sweep Second Date and Day Model 2426 10 Hour Minute Sweep Second Date Driving Wheel Removing Tool PRESTO 3 for 5 Spoke Wheel and Time Zone Feature Day Indicator In two languages English and Spanish or English and rench NOTE THE CALIBER NUMBER IS ENGRAVED INSIDE THE BATTERY WELL Frequency Counter With 32 768 Hz capacity Crown Positions Position 1 Normal Running Position 2 e
7. 90 000 01 Dial Screws 93 010 Casing Ring Diameter Height 93 010 1 26 90 2 50 93 010 2 28 40 2 95 93 010 3 30 40 2 95 63 64 Minute amp Hour Hands 65C Sweep Second Hand Note Some Resonators do not require a nest BASIC MODEL 2421 10 2423 10 2423 10 2421 10 2421 10 2421 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 242 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2421 10 2423 10 2421 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2421 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 Parts List for Model 2422 10 Varying From or Addition To Model 2421 10 PART NUMBER 10 020 10 106 10 106 1 10 106 2 10 106 3 13 101 13 101 01 30 081 31 046 31 083 33 014 33 028 51 052 91 440 PART NAME Main Plate Dial Supports Diameter Height 26 85 1 35 28 35 1 35 30 25 1 35 Calendar Mechanism Maintaining Plate Calendar Mechanism Maintaining Plate Screw Sweep Second Pinion Height 6 75 Hour Wheel Heights 2 12 or 2 37 Cannon Pinion with Driver Heights 3 30 or 3 55 Intermediate Calendar Wheel Calendar Driving Wheel Rocking Bar Date Indicator Parts List for Model 2423 10 BASIC MODEL 2422 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 2423 10 Varying From or Addition To Model 2421 10
8. Setting and Calendar Mechanisms use thick oil such as Moebius 9024 Calendar Jumper Springs contacting plastic use light grease such as 22 Check the Following Mechanical Points Hand adjustment hands level not touching dial markers etc Driving wheel correctly fitted on the third wheel pivot e Functioning of the calendar mechanism e Functioning of the hand setting mechanism e Stop lever should not touch the intermediate train wheel when setting stem is in the inter mediate Position 2 or pushed Position 1 Freedom of the train wheels To check train freedom remove power cell electronic circuit driving wheel and motor Reinstall driving wheel With the stem in the in position direct a stream of air from a watchmaker s hand blower horizontally against the driving wheel The train wheels will turn if they are free If not free recheck for train blockage excessive tension of center second spring calendar mechanism blockage etc Check the Following Electrical Points Screws of electronic circuit are tight Contact spring screw is fitted with its insulator Part 420 652 Printed circuits are clean use leather buff no abrasives Contact of the disconnect system as follows Sight through view hole Fig 7 Pg 5 Make sure contact spring presses on setting lever contact stud when the hand setting crown is pulled out as far as it will go P
9. Instant Calendar Setting e Hour Hand Adjustment for Time Zone Feature Model 2426 10 Position 3 Stops Second Hand e Synchronizing ACCUSET circuit Minute and Hour Hand Setting Disconnect Position Conserves life of power cell when watch is not in use Fig 5 Power Cell Insert Power Cell with printed side up Recommended Power Cell Bulova 242 1 55 volt Note The caliber number is engraved inside the battery well Fig 6 Checking the Frequency Rate Quartz Frequency is 32 768 Hz Rate should be within 0 17 seconds per day Adjusting the Frequency Rate lt s Use a screwdriver to turn the trimmer in the appro priate direction or See Fig 1 Pg 2 The maximum rate change is approximately 8 seconds per day Setting Instructions and Synchronizing Electronic ACCUSET Circuit Important It is necessary to re synchronize ACCUSET circuit after A Installing a Power Cell B Servicing the Movement C Interruption of Current e g loose contact screw Setting Instructions Step 1 When sweep second hand of the watch reaches the 60th second mark 12 o clock marker pull crown out to Position 3 See Fig 5 All hands will now stop Step 2 Press and release ACCUSET button ACCUSET circuit is now synchronized with position of second hand M Step 3 Turn hands forward until date changes This establishes midnight Step 4 If A M advance hands 5 minutes ahead of a
10. ads Note Some movements do not require a Quartz Cannister Nest Stepping Motor When removing use the flange of the motor housing to apply presure Avoid pulling or pushing on the motor gear Care should be taken that the printed circuit leads are not damaged MODEL 2426 10 This model is similar to Model 2422 10 with the additional feature that the position of the hour hand can be changed from one time zone to another with out affecting the other hands Setting Instructions Instructions for setting this model are basically the same as the Setting Instructions shown on Page 4 except for the setting of the time zone feature 1 To Change to Another Time Zone Pull crown out to intermediate Position 2 Each slight turn forward or backward will change the hour in one hour increments without disturbing the minutes seconds or date 2 To Set the Date Pull crown out to intermediate Position 2 The date can be advanced or moved back by turning the crown rapidly Be sure that the time is set in the correct 12 hour period so that the date will change at midnight and not at noon Model 2423 10 Circled figures refer to the assembly sequence of the various parts Fig 8 36 051 33 014 T s dew Lubricants Moebius 9024 KT22 DIAL UP DIAL DOWN Pme 30 051 a 10 513 02 P 0 513 01 10 048 01 40 700 60 652 20 701 01 10 048 01 T tc j 763
11. e spring to Step 5 Remove blockage from train or not turn or it If Motor does not turn or it If Motor indexes 12 times 1 complete rotation Motor is O K and Circuit is faulty Replace Circuit Circuit and Motor O K Proceed to Step 5 Motor still does not turn or it Continue to Step 4 hesitates M Motor lead for accessory place it on the Motor gear ex one tooth Proceed to Step 5 ting Black Clip If Motor does not index or it ead to the other vals hesitates Motor is faulty Replace Motor ing is below 7 5 s ing is above 7 5 If circuit does not correct return it to stock and replace Motor Replace Electronic Circuit Servicing information continued from page 5 Checking the Components Note The following components can be tested and replaced if necessary without removing the move ment from the case See Pages 6 and 7 for basic test procedures 1 Power Cell 420 570 2 Electronic Circuit 410 513 3 Stepping Motor 420 510 remove driving wheel first 430 051 4 Resonator Quartz Crystal 440 510 Removing the Components Electronic Circuit Grip circuit board near the trimmer Do not touch or scratch the printed circuit Resonator Quartz Cannister with Nest When disassembling remove the Cannister and its nest as a single unit Do not pry up by the printed circuit le
12. o nization with the time standard Important When the crown is all the way out Position 3 motor and all hands stop The ACCUSET circuit continues to operate and the quartz crystal continues to vibrate using extremely little current Store watches with crown in out Position 3 to prolong battery life MOTOR LEADS PEEP HOLE FOR INSPECTING THE CELL STRAP DISCONNECT SYSTEM CELL CONTACT SPRING ACCUSET CELL CONTACT CONTACT SPRING INSULATOR Fig 7 Servicing Note For disassembly and reassembly sequence see pages 8 and 9 Circled numbers refer to the assembly sequence of various parts The following components should not be dipped in solvent e Dial Support 410 106 e Electronic Circuit 10 513 e Calendar Mechanism Maintaining Plate 13 101 e Stepping Motor 420 510 e Resonator Quartz Cannister with Nest 440 510 e Date Indicator 291 440 Day Indicator 891 441 e Casing Ring 493 010 Note Electronic Unit Support Bridge 810 580 and the Battery Support 420 701 may be left in the movement Cleaning and Lubrication After removing the components listed above clean movement using One Step Miracle Plastic or equivalent solution Never oil train wheels with con ventional watch oil If cleaned in conventional manner do not oil train wheels but lubricate the dial train setting and calendar mechanism as shown on pages 8 and 9 using the lubricants listed Lubricants
13. osition 3 Check ACCUSET Contact As Follows Contact spring should touch the main plate when ACCUSET button is pressed with movement in the case e Contact spring should not touch the main plate and should clear the plate by at least 0 10 mm when the ACCUSET button is released Second Hand The second hand is counterpoised If replacement is necessary use only genuine replacements When redialing wait until motor has indexed a few times then pull crown to the out position Position 3 While holding in position align the sweep hand with the 12 o clock marker and press into place Servicing information continued on page 8 6 Basic Test Procedure for S M Q Series 242 Step 1 Check Power Cell Check Frequency Rate 1 50 to 1 58 Volts O K to Use Proceed to Step Less than 1 50 Volts Rate O K or regulate if necessary Proceed to Step 3 No Rate or Very Erratic Replace Electron Step 3 First Connect Bl loop on Service A marked Blue Y Clip to loop mark Then Connect ment Clip to Cell Connect Black Clip to Cell Cont Lower Disregar meter reading S Remove Power Cell from Movement and place in Meter Cell Well Set Meter Selector at LOW AMPLITUDE Set watch to 11 45 P M to engage calendar mechanism Push crown in Position 1 Connect Meter to Service Accessory
14. te Calendar Wheel 2426 10 33 028 Calendar Driving Wheel 2426 10 36 030 Corrector Wheel Hour 2426 10 36 051 Corrector Setting Wheel Zone 2423 10 36 052 Corrector Intermediate Setting Wheel Zone 2423 10 36 100 Corrector Driver Hour 2426 10 91 440 Date Indicator 2423 10 Note Parts for 2426 10 listed above are not illustrated Notes Calendar Mechanism Turn hands clockwise until DATE changes disregard Day Indicator Push Crown in Position 1 Assemble Minute and Hour Hands at the 12 o clock position Second Hand When redialing wait until motor has indexed a few times then pull crown to the out position Position 3 While holding in position align the sweep hand with the 12 o clock marker and press into place Caution Do not remove the shaped clamp Date Corrector from the Rocking Bar Assembly 51 052 20 570 31 041 31 046 40 510 10 048 01 10 513 02 31 083 31 100 T 10 513 01 10 580 01 20 701 01 31 102 31 124 51 080 51 090 AX Tq TX LON 4 oy Sy ac 24 13 101 01 Y 20 510 01 Fig 9 33 014 e 30 051 33 028 33 102 36 051 36 052 53 201 56 070 60 131 61 101 Y Y Y 51 090 01 61 101 01 90 000 01 20 701 02 11 Li BULOVA ACCUTRON QUARTZ lt p Service Manual Series 242 E I dics Ce c a
15. tis heh 10 11 DIVIDER CIRCUIT QUARTZ CRYSTAL OSCILLATOR FREQUENCY CONTROL TRIMMER T REGULATOR Fig 1 ACCUSET BASIC ELECTRONIC FUNCTION OF ACCUTRON QUARTZ SERIES 242 Refer to Fig 1 The Accutron Quartz Series 242 is powered by a 1 55 volt Bulova 242 battery Voltage from the battery is introduced into the electronic circuit which then transmits current to the Quartz Crystal circuit causing it to vibrate at 32 768 Hz cycles per second The accuracy of the watch is dependent on the frequency of the Quartz Crystal If the Quartz frequency is incorrect the TRIMMER capacitor regulator within the movement can be turned to make adjustments of up to 8 seconds per day This Quartz frequency rate must then be converted to one second impulses before it can be used to mechanically drive the hands of the watch This is accomplished by means of an electronic divider circuit The divider circuit which contains 15 stages receives the signal generated by the Quartz Crystal and divides this signal by two in each of the 15 stages The 15th stage emits one pulse per second The divider circuit divides the 32 768 Hz to 1 Hz 2 5 32 768 which drives the stepping motor in the timekeeping mode The motor in turn drives the gear train which is connected to the dial train causing the hands to turn ACCUSET Operation In addition to the 15 stage divider and other circuits there are also t
16. wo independent counter ACCUSET control logic circuits These logic circuits perform the resetting function for the ACCUSET feature Both are set to zero when the crown is out see Fig 5 Pg 4 Position 3 and the ACCUSET button is pushed and released When the stem is pushed in Position 1 or 2 both circuits start to count continu ously one count per second up to 60 and then start over again At a later date if the sweep hand indicates a time keeping error within 30 seconds pushing the ACCUSET button will correct the error It will cause the motor and therefore the hands to stop or double pulse in relation to the error This is the means by which a timekeeping error can be corrected More detailed instructions are found on Pages 4 and 5 MOTOR DRIVER This illustration is a simplified version of the complicated circuit within the Accutron Quartz Series 242 It is not intended to be used as a means of conveying any other thought but a practical way of demonstrating basic theory 1 PULSE SECOND Technical Data Tools and Equipment Bulova Accutron Meter No 700 Bulova S M Q Meter Accessory No 9920 6603 Bulova Accutron Quartz Series 242 Electronic movement with quartz resonator stepping motor id ACCUSET BULOVA NO 700 METER Fig 2 gt CHECK POWER CELL e we lt lt 1 Diameter d 26 mm 11 ligne Thickness Fig 3 4 55 mm Caliber 2421 10 5 50 mm Calibers 2422 10
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