SMQ Service Manual
Contents
1. a BULOVA WATCH COMPANY INC GENERAL SERVICE MANUAL FOR ANALOG QUARTZ SMQ WATCHES ACCUTRON BULOVA CARAVELLE QUARTZ lt gt TABLE OF CONTENTS Basic Theory of a Stepping Motor Quartz SMQ Watch 2 Relation of a Stepping Motor Quartz to Mechanical Watch 3 Basic Test Procedure for S M Q Watches s EEA 4 amp 5 Mecnnicalintormaton ssi inara eaan a e ENET 6 INTRODUCTION Most Stepping Motor Quartz SMQ movements in the field today are similar in design and relatively simple to service Differences are mainly in the quality and location of the components Under standing how an SMQ functions reduces the anxiety one may have which would prevent an attempt at service BASIC THEORY OF A STEPPING MOTOR QUARTZ SMQ WATCH The SMQ movement receives its driving force from a battery Energy current from the battery flows to the oscillator control of the electronic circuit and then to the Quartz Crystal causing it to vibrate Most Quartz watch crystals in use today vibrate at a frequency of 32 768 Hz vibrations per second The accuracy of the watch is dependent on the accuracy of the crystal The 32 768 Hz vibrations must then be reduced to a workable number of timing signals By feeding the frequency signals into the frequency divider circuit the signals are reduced until the required number is obtained POWER CELL BATTERY DIVIDER QUARTZ C2. __ clips from Electronic Circuit Meter pointer fluctuates havi Set meter at Low Amplitude Sg but movement does not step Remove blockage Movement ep Connect meter to movement Coil assembly OK Pro gt steps as shown in fig 3 blem is caused by mechanical blockage Boe pointer should indicate approximate low and high ac gt ceptable tolerances See in dividual service bulletin for tolerance If reading is above acceptable microamperes tolerance re ere Fae Meter selector at Read Ca Micro amperes Pointer will ieee heck mechanical area for fluctuate This is normal one a arga bind or blockage icent to rotor minute or IMPORTANT The meter cell well clip must make firm contact with the well contact button tine if movement is stepping lf necessary slip a metal disc between the spring and contact button 5 TECHNICAL INFORMATION Most Bulova SMQ watches contain the following similarities functions or displays QUARTZ FREQUENCY 32 768 Hz Cycles per second ELECTRONIC CIRCUIT C MOS Integrated Circuit produces a variety of signal pulses to the rotor of from 2 to 60 pulses per minute See individual caliber service bulletin for correct number of pulses DISCONNECT SYSTEM In some models With stem in disconnect setting position only the Quartz Crystal continues to vibrate The remaining circuit and the mechanical driving portio
3. Watch Company Inc All information contained in this service bulletin is based on the latest product information available at the time of printing Technical Information Services Bulova Watch Company Inc 75 20 Astoria Blvd Jackson Heights N Y 4370 6 8 20M PRINTED IN USA
4. becomes exhausted it should be replaced at the earliest opportunity to diminish the possibility of leakage NEVER STORE A WATCH WITH AN EXHAUSTED POWER CELL IN IT CROWN POSITIONS for 2 position stem watches POSITION Normal Running POSITION 2 Minute and Hour Hand Setting Disconnect on some models CROWN POSITIONS for 3 position stem watches Fig 5 23 POSITION Normal Running maine POSITION 2 L Instant Calendar Setting Do not reset between the hours of 0 00 p m and 2 00 a m POSITION 3 Stops Second Hand Minute and Hour Hand Setting Disconnect Position Conserves Life of power cell when watch is not in use SETTING INSTRUCTIONS for 3 position stem watches Step When sweep second hand of the watch reaches the 60th second mark 72 00 o clock marker pull crown out to Position 3 see Fig 5 The sweep second hand will stop Step 2 Turn hands forward until date changes This establishes midnight Step 3 If A M advance hands five minutes ahead of a time standard being used Then gently turn the minute hand back to correct time If P M advance hands 2 hours past 2 00 o clock noon to five minutes ahead of time standard and then gently turn the minute hand back to correct time Step 4 When the time standard being used reaches the 60th second mark 2 00 o clock marker push crown to the intermediate position Position 2 The sweep second hand will start
5. instantly Step 5 With crown in 2nd position slowly turn the crown in one direction to set the day and the opposite direction to set the date See Individual Service bulletin NOTE Day indicator is printed in English and Spanish or English and French Set accordingly TOOLS AND EQUIPMENT e Frequency Counter with 32 768 Hz capacity e Bulova Service Meter 700 Bulova Accessory 9920 6603 e Non magnetic tweezers Watchmaker s Hand Tools Watchmaker s Loupe com SERVICE Knowledge of the procedure listed below will reduce service time Establish customer s reason for return of watch 2 Visually inspect watch for damage 3 Check the battery for correct voltage position or and number CLEANING It is not necessary to clean an SMQ movement periodically Clean only those areas that require cleaning The following components should not be subject to heat or harsh cleaning solvents The Electronic Circuit Coil Winding Stepping Rotor Quartz Crystal cannister stator or any of the plastic parts The proper cleaning solutions and method of cleaning will be indicated within the individual service manual The rotor pivots and pinion can be cleaned with One Dip soft pith wood or One Touch DO NOT PUT IT IN CLEANING SOLUTIONS some magnets are cemented to an arbor and may separate if subjected to strong solution LUBRICATION Unlike mainspring driven watches which exert ext
6. when the trimmer is turned 360 indicates a faulty trimmer Replace trimmer if possible P C Board if necessary A frequency reading that cannot be regulated to within tolerance trimmer Ok indicates a faulty Quartz and must be replaced Replace Quartz Crystal if possible P C Board if necessary A Quartz Crystal that is vibrating and produces a reading on the frequency counter does not indicate that the complete electronic unit is functioning There are basically 2 halves to a P C Board One half drives the Quartz The other half contains the circuit which reduces the Quartz vibration from 32 768 Hz per second down to 60 30 20 6 2 etc pulse signals per minute to the rotor motor Therefore No frequency reading indicates possible faulty Quartz electronic circuit or dead battery 2 Good frequency reading but no impulse signal on meter indicates possible loose contact screw open coil or faulty P C Board See pages 4 and 5 HELPFUL HINTS ELECTRONIC CIRCUIT Use a tweezer to grip the Printed Circuit Board not covered by the printed pattern Do not touch circuit board with fingers or scratch the printed circuit Note Check before removing P C Board Some P C Boards have the coil attached and both the board and coil retaining screws must be removed before disassembling P C Board COIL ASSEMBLY Use a tweezer to grasp the coil core at the bare hole end and not the end containing the connections to the print
7. 0 to 58 volts OK to use ELL K ae Proceed to Step 2 Less than 50 volts Replace Rate OK or regulate if _ necessary Rate OK or regulate if _ Proceed to RATE 7 necessary Step 3 gt Quartz Crystal as necessary Remove cell from movement and insert it into the meter cell well Connect meter to Proceed to Step 5 Movement steps Electronic movement Fig 3 ae Cell i circuit coil winding and CHECK CHECK With Power al in movement a mechanical portion OK With a power cell still in et eee N movement and none in meter Movement does not step gt set meter at low amplitude Place accessory alligator clips on electronic module as shown in fig 4 Continue as follows If movement still does not ee Proceed to Step 4 lf Meter Pointer flicks alter step problem is in the coil nately above and below 0 assembly or mechanical fig 4 Electronic Circuit OK blockage and insert into meter well lf Meter Pointer does not flick Nx Connect meter to accessory replace Electronic Circuit if movement steps accessory to movement See individual service bulletin Remove cell from movement Proceed to Step 5 Meter pointer does not fluc Remove cell from movement tuate Replace coil assembly x and insert it into the meter we cell well Remove alligator Meter pointer fluctuates Movement steps oe Eck
8. RYSTAL E T QUENCY CONTROL TRIMMER REGULATOR SEINGUNSIUCTONS Hees eee wee A eae wee tee si 6 Sorico 5 morer eaten tn meen Sere neon csot a s 7 Helo tulilintS eset sesso sco E a if Accusetkeature 2a acy eee aoe inn eee 8 The final signal is then fed into the motor driver circuit which causes a switch to open and close at specific intervals allowing current from the battery to activate the coil winding The coil winding converts these current pulses into alternating north and south magnetic fields The rotor complete with magnet is positioned next to the coil and receives the alternating magnetic signals from the coil This magnetic field attracts and repels the magnet on the rotor causing the rotor to rotate at specific intervals and direction The rotor in turn drives the gear train dial train calendar train and hands To summarize The battery current causes the Quartz Crystal to vibrate 2 The vibrations are converted into timing signals which are then reduced by the electronic circuit 3 The electronic circuit alerts the battery to furnish current to the motor 4 The motor turns driving the mechanical portion of the watch Note Electronic circuit is also referred to as a P C Printed Circuit Board This illustration is a simplified version of the complicated circuit within a Stepping Motor Quartz watch It is only a means of demonstrating a basic electronic the
9. approx imately 5 seconds for the meter at tachment 9920 to lower its stored voltage before making a low amplitude test After the meter leads are attached to the movement the meter pointer may remain stationary at approximate ly to 3 microamps and not indicate a pulse fluctuation This can be caused by a loose contact screw a faulty P C Board or a bad coil Check accord ingly If Accuset model wait 30 seconds for sweep hand to start A watch which indicates a good frequency and meter pulse but the hands do not move indicates a mechanical problem Check for metal slivers on magnet Check gear dial and date wheels for blockage binding or excessive lubrication Clamp accessory clips to screwdrivers or wire oilers as probes Place probes on coil wire terminals This illustration indicates where to apply the probes Positions may vary with caliber If necessary remove magnetic shield to determine particular caliber contact position IC TEST Step Se CHECK POWER CHECK POWER Step 2 CHECK FREQUENCY CHECK FREQUENCY Step 3 ELECTRONIC CIRCUIT ELECTRONIC CIRCUIT Step 4 COIL WINDING CH COIL WINDING CH Step 5 CURRENT CHEC URRENT CHEC lt View rotor wheel adje sweep hand to detern PROCEDURE FOR S M Q WATCHES NOTE It is imperative that the basic step by step procedure be strictly adhered to beginning with Step and continuing through Step 5 5
10. e ACCUSET circuit has been set there is no need to reset it unless after A Installing a Power Cell B Servicing the movement C Interruption of current e g loose contact screw CHECKING THE ACCUSET FUNCTION After programming the ACCUSET feature check as follows Press and release ACCUSET button Fig 7 when the watch s second hand reaches the 5 second marker The second hand should stop for 5 seconds 2 Press and release ACCUSET button when the time standard being used reaches the 60th second marker The second hand should then advance twice as fast until the correct second is reached USING THE ACCUSET CORRECTOR Once the ACCUSET feature has been programmed and 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 time standard used reaches the 60th second 2 00 o clock marker Maximum 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 synchronization 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 Fig 7 ACCUSET BUTTON Either position Accutron Bulova Caravelle SMQ and l are registered trademarks of the Bulova
11. ed circuit STEPPING ROTOR Handle rotor by its pinion and not the magnet Do not put in cleaning solutions other than those recommended in service manual Some magnets are cemented to arbor and may separate if subjected to strong solutions TO OPEN CASE Use a piece of plastic sheet placed between the case opener and case to prevent damage to the case REMOVING HANDS On some models the cannon pinion may lift during hand removal Make certain the cannon pinion is lowered before advancing to the next operation If the cannon pinion is not lowered damage may occur to the dial train during attempts at setting the watch REMOVING THE STEM ASSORTED TYPES A Screwdriver set lever screw B Pointed tool set lever pin C mm wide blade set lever pin D Downward pressure lever set lever release E Swivel type set lever release See individual service manual DIALING Calendar Mechanism Turn hands clockwise until DATE changes disregard Day Indicator Push crown in Position Assemble Minute and Hour Hands at the 2 00 o clock position Second Hand When redialing wait until motor has indexed a few times then pull crown to the out hack position Position 3 While holding in position align the sweep hand with the 2 00 o clock marker and press hand into place The second hand is counterpoised If replacement is necessary use only genuine parts CHECKING HAND MOVEMENTS A
12. fter casing visually check that the sweep second hand on some models or the minute hand advances This movement of the sweep hand is readily noticeable but the minute hand is barely visible short in length and occurs only once in 5 0 20 or 30 second intervals The hand advancing indicates that the transmission of power to the dial is occuring No advancement indicates a problem CHECKING THE TRAIN WHEELS Remove Cell from movement The rotor held in place by its magnetic field does not allow the train to turn freely The freedom of the train wheels can be checked by moving each wheel up and down CHECK THE FOLLOWING POINTS Hand adjustment hands level not touching dial markers each other or rubbing on underside of crystal Calendar mechanism is free Setting mechanism is free but not excessively free which would indicate a worn center wheel cannon pinion assembly l 4 Hack stop lever must not be bent or distorted ACCUSET FEATURE Some models are equipped with the Accuset feature In addition to the divider and other circuits there are two independent counter ACCUSET control On logic circuits These logic circuits perform the resetting function for the ACCUSET feature ACCUSET SETTING INSTRUCTIONS After programming Step of setting Page 6 press and release ACCUSET button ACCUSET circuit is now synchronized with position of second hand Continue with Step 2 Setting Instructions Once th
13. n is at rest thereby preserving the life of the battery ACCUSET A feature that automatically corrects the second hand by merely depressing a recessed push button See back page DAY INDICATOR In two languages English and Spanish or English and French Set accordingly AUDIBLE SOUND Most SMQ watches produce a sound which is practically inaudible to the human ear POWER CONSUMPTION Microampere drain Current consumed in running operation See individual Service Bulletin BULOVA MOVEMENT IDENTIFICATION CODE First 3 digits refer to Series 4th digit indicates displays 245 0 Hour Minute 245 Hour Minute Second 245 2 Hour Minute Second Date 245 3 Hour Minute Second Date Day 245 6 Hour Minute Second Date Time Zone THE POWER CELL BATTERY Use recommended cell The battery to be correct must be the exact type diameter height voltage low or high drain and electrolite e g Mercury Silver Oxide or Lithium etc recommended in the individual Service Manual It is imperative that the battery be properly inserted into the movement and symbols are often used to indicate the proper positioning of the battery These symbols are either stamped on the upper or lower battery straps inside of the battery well or imprinted in the case back If the cell is not replaced before it is exhausted the watch will simply stop The movement should not be harmed in any manner However when it
14. ory Illustration 7 pulse per second 60 pulses per minute gt SWITCHES Ao 0 BIPOLAR STEPPING MOTOR y INTEGRATED CIRCUIT Pa RELATION OF STEPPING MOTOR QUARTZ TO MECHANICAL WATCH MECHANICAL STEPPING MOTOR QUARTZ E o ae CELL BATTERY Provides Power Energy Se 20 ee CRYSTAL Source of Accuracy Teen Meee RIMMER Means of Adjusting Rate ees e CIRCUIT Converts Quartz Vibrations into Electronic Signals and reduces signals to a workable number 0 70 DRIVER CIRCUIT Activates switch releasing energy to coil winding WINDING Releases energy on command Magnetic field ee Drives the gear and dial trains el ae AND DIAL TRAINS Turns the hands There is one basic difference The flow of energy power in a mechanical watch starts at the mainspring and is transmitted to the gear train escapement and balance wheel The flow of power in an SMQ starts at the battery then flows through the electronic circuit to the crystal divider motor and coil circuits causing Fig 2 THE QUARTZ ELECTRONIC TRIMMER POWER QUARTZ INTEGRATED STEPPING CELL CRYSTAL CIRCUIT MOTOR THE WIND UP WATCH CROWN MAINSPRING GEARS TO WIND MAINSPRING Provides Power Energy BALANCE WHEEL Source of Accuracy REGULATOR Means of Adjusting Rate ESCAPEMENT Transmits balance accuracy to gear train amp releases ene
15. reme pressure on the wheel pivots and bearings subjecting them to a high degree of wear the SMQ design is such that it reduces wear drastically The wheels of an SMQ are Free Floating with a minimum of pressure It is therefore extremely important that the correct lubricant and amount of lubrication used be carefully controlled Avoid heavy lubricants and excess application in the gear and dial train area Do not lubricate unless recommended in individual Service Bulletin Fig 6 LUBRICATE IMPORTANT Lubricate the slip area between the arms of the driving wheel and the cannon pinion as shown here Either lack of lubrication or foreign matter between the cannon pinion and the center wheel post or the cannon pinion and the driver wheel can cause the pinion to bind creating damage to the minute wheel hour wheel and minute post Check the Service Bulletin for proper lubrication CHECKING THE FREQUENCY RATE Place the watch on a frequency counter pick up The crystal frequency should be 0 or 0 4 seconds a day Trimmer allows watch to be regulated accordingly ADJUSTING THE FREQUENCY RATE Use a metal blade inbedded in a non conductive material to turn the trimmer in the appropriate direction or On the average the maximum rate change is approximately 8 seconds per day Avoid excessive downward pressure on the trimmer A frequency reading that will not change drastically
16. rgy to drive the balance PALLET SLOT Transmits energy to drive balance wheel PALLET STONES Releases energy on command ESCAPE WHEEL Releases mainspring power to drive the balance wheel GEAR AND DIAL TRAINS Turns the hands the rotor to turn and drive the train wheels This difference in the flow of energy and the lack of mainspring pressure substantially reduces the torque or driving power of an SMQ It is therefore imperative that an SMQ watch be free of excess drag or bind See cleaning and lubrication on page 7 POWER FLOW Note the Nin distance of the gear train TRO from the power source os between a mechanical and SMQ watch GEARS DIAL GEARS ESCAPEMENT BALANCE WHEEL MOVEMENT x j ji j K Fig 4 Low AMPLITEOE CHECK PUWER GELL READ y DFF menonwrrnes A l s XY BULOVA NO 700 METER Note photographs of units are not to actual size Fig 3 9920 6603 ACCESSORY BLACK CONNECTING METER TO MOVEMENT Attach yellow Meter clip to yellow marked loop on Accessory 9920 6603 2 Attach blue Meter clip to blue marked loop on Accessory 3 Connect Red Accessory clip to connection of movement see individual caliber manual 4 Connect Black Accessory clip to movement see individual caliber manual METER HINTS It is necessary to wait
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