MESSENGER-II SERVICE MANUAL
Contents
1. MESSENGER II Rev C Nov 1989 iss 815 1 SL 4 Feb 90 C101 C102 C103 C104 C106 C107 C108 C109 C110 111 112 118 C119 C120 C121 C123 C125 C126 C129 12 S15 S16 S16 S17 S17 Messenger II PLAYER PARTS LIST CASE ASSEMBLY No C100 PART Front Case Back Case Speaker Speaker Clamps x2 Upper Crank Bearing Cassette Well Cover Mounting Post A x 2 Mounting Post B Mounting Post Mounting Post D Spacer Post Blanking Plate Label Cassette Cover Label Name Plate Label Model M Label Model MP Reflective Sticker Label Serial No 2 off Cassette Well Cover Locks Motor Post Screw Case Screws 4 off Speaker Clamps screws x2 Mechanism Screw Handle Screw 1 off Generator Assembly screws x2 DESCRIPTION Moulded ABS includes C108 C111 Moulded ABS 3 dia 8 ohms 0 5 watt Ferrite or Alnico type Pressed steel 22g Acetal Bearing Moulded polycarbonate 1 4 x 0 925 machine brass 1 4 x 1 850 machined brass 1 4 x 2 283 machined brass 1 4 x2 600 machined brass 1 4 0 0948 Hex steel machined Moulded Nylon Press STOP button before removing cassette Messenger II LRI 02 LRI 02 Mabuchi Generator D C only LRI 03MP Mabuchi Generator A C power input 24mm dia orange self adhesive Moulded plastic M3 x 0 5 x 6mm machine screw M3 x 0 5 x 16mm machine screw M3 x 6 self tapping screw M3 x 6 self tapping2. part is from and thereby on which drawing it is shown A single digit numeral to indicate major part revisions or alternative types These are listed underneath each other in the parts list and must be determined when ordering parts An indicates alternative types of the part and that appropriate type no must be selected from the parts list when ordering The 5 is a computer prefix e g Gx17 refers to G117 or G217 in parts list A two digit numeral to identify the particular part in the assembly Assembly Letter Type No Part No e g Part No B104 B 1 04 2 HOW TO ORDER PARTS Please identify the part from Parts Drawings and write both its Part No including appropriate type and Name plus Quantity Also please include complete Serial Number s of the player s for which the parts are required If the parts are for spares for a a quantity of players then the most common Model Letters and Batch Letters would be sufficient Sample Order QUANTITY PARTNO NAME SERIAL NO 5 05 G104 Gen Belt MP DCEC 01548 If possible please try to explain what is the fault in worn parts and what may have caused them to fail Also describe the symptoms of the fault and the in service age of the player This will greatly help us to develop a better player for the mutual benefit of all users of these players MESSENGER II DISASSEMBLY AND SERVICING Please refer to Drg M 02 To Open Case See also drg M 03 a Unscrew the Crank a
3. removing the Flywheel Retainer Plate its end play should be checked This should be 0 005 0 010 0 13 0 25 mm If this is incorrect it should be adjusted as follows i Make certain the 3 screws securing the Flywheel Retainer Plate are tight N B Do not overtighten any screws on the mechanism ii Using a screwdriver adjust the End Thrust Bearing in the Retainer Plate until there is a slight gap between the bearing and the end of the shaft of the Flywheel iii Remove the Drive Belt M120 from the Motor Pulley Move the Flywheel up and down to feel the end play while slowly screwing the Thrust Bearing in until the end play just disappears Then unscrew the Bearing 1 turn and check that the Flywheel has the correct amount of end play and spins freely iv Replace the drive belt and seal the Thrust Bearing in place with contact cement d To replace the Playback Head M114 unsolder the wires remove only the screw nearest the pinch roller Then move the Head sideways out from under the other screw If the Playback Head is replaced or disturbed its azimuth angle will need to be adjusted to ensure correct playback of all frequencies This is achieved by adjusting the spring loaded mounting screw while playing a 6 3 KHz at 15dB alignment tape and adjusting for maximum signal level please refer to testing procedures If a special alignment tape is not available a good music passage on a commercially produced tape may do Listen for sharp
4. screw M3 x 10 self tapping screw M3 x 10 self tapping screw 2 L Messenger II PARTS LIST GENERATOR ASSEMBLIES NO G100 DESCRIPTION Moulded acetal 2 2mm sq section polyurethane Machined steel 5mm dia Pressed Steel galv 20g Moulded Nylon Machined Steel 1 4 dai 1 16 x 1 2 steel pin 1 6 x 12mm steel split pin Mabuchi RF 370C 15370 Pressed steel galv 20g 12mm dia x 7mm wide M 3 32 dia x 12mm tubular alum rivet Machined steel Moulded Glass filled nylon Moulded nylon Moulded glass filled nylon Machined steel 1 8 B S W hex steel Generator Socket Connector Utilux H9540 3 KK connector NO PART G102 Pulley Wheel 0104 Generator Belt G106 Pulley Wheel Shaft 0107 Gear Plate G108 Gear Wheel G109 Crank Shaft G111 Roll Pin G112 Split Pin G117 Generator G118 Generator Plate G120 Generator Pulley G121 Crank Arm Pin G122 Crank Drive Stud G123 Crank Arm G124 Crank Knob G125 Crank Hub G126 Crank Knob Pin G132 Pulley Shaft Nut G141 G143 Gear Plate G144 Gear Adjusting Plate G145 Gear Adj Plate Rivet G146 Gear Adj Plate Root Nut G227 Lower Crank Bearing P106 Cable Tie 150mm P114 Terminal Clip large S06 Generator Plate Screws x 2 S12 Gear Adjusting Plate Screw S14 Generator Screws x 2 W03 Generator Screw Washer W03 Pulley Shaft Washer 06 Gear Adj Plate Washer W07 Crank Thrust Washer WO08 Pulley Wheel Washer W
5. the Side Plate Screws M108 and then move the assembly sideways from the mechanism ii If the circuit board is to be replaced desolder all wires from the circuit board noting their colour and position on the board Remove the two D C Socket Screws S02 and the Dress Ring B207 from the External speaker Socket B206 and them remove the Side Plate B208 Remove the Volume Control Screw S01 and Wheel B202 b To Reassemble and Replace i Replace Volume Control Wheel B202 and Screw S01 Attach Side Plate B208 with Screws S02 and Dress Ring B207 iii Position the Circuit Board Assembly correctly on the mechanism by pushing the slots of the Side Plate firmly against the Side Plate Screws M108 before tightening them Then replace Circuit Board Screw 106 and Washer 107 4 Servicing the Mechanism M100 See also drg M 05 a With the mechanism removed from the case all pars of it are easily accessible for adjustment and replacement of parts b Before removing any part note it s position and method of retention Also observe other associated parts which may be disturbed during removal such as springs and washers Very carefully remove the small components such as clips which may be easily lost c If the Flywheel is removed care should be taken that its capstan shaft is not knocked in any way during handling Any damage to the capstan shaft would cause the player to produce a rapidly wavering sound After replacing the Flywheel or
6. 09 Crank Bearing Washer W10 Lower crank Bearing clamp SUB ASSEMBLIES G110 Crank Shaft Assembly 0116 Generator Lead Assembly G138 Generator Assembly 0142 Gear Plate Assembly G150 Crank Arm Assembly Moulded acetal 250 I D Moulded plastic 2 6 x 4 Taptite Screws M3 x 0 5 x 6mm machine screw M3 x 0 5 x 3 5mm machine screws M3 internal shake proof washer M3 internal shakeproof star washer 1 8 x 3 8 washer 5 32 x 3 8 x 21g flat washer MIO x 5 x 0 5 steel washer 1 4 x 1 2 x 24g flat washer Pressed spring steel Comprises part nos G109 G111 Comprises twin core wire plus G141 2 x P114 Comprises part nos G117 G120 G116 P106 Comprises part nos G143 G146 Comprises Part Nos G121 G126 W07 Wud lt E QC wo 15 6120 MESSENGER I1 PLAYER ______ Generator Assy Cenepa 4 Deg Rev Feh Vx orate 5 01 5 02 5 02 5E03 5E03 5 108 110 114 115 117 120 122 127 139 143 145 149 153 154 161 162 166 168 170 172 174 174 178 M193 M194 M195 M203 M208 5M238 5P106 5503 5508 5508 5510 5512 5512 5522 5523 5524 5WO01 5WO01 5W03 CA CA CA CA CA CA CA CA CA CA CA CA CA CA CA CA CA CA CA CA CA CA CA MECHANISM ASSEMBLY No M200 PART Reel cap circlip x 2 Brake plate guide pin circlip x 3 Pinch Roller frame post circlip Clutch swivil pin circlip Head base guide circl
7. 106 Cable Tie 150mm 5M115 Pinch Roller Assembly 5M136 5M137 5 138 Pinch roller Pinch roller axle Pinch roller frame 5M130 Button frame assembly 5 02 5 102 103 104 105 131 132 135 175 176 CA CA CA CA CA CA Button shaft circlip Stop button red Play button green Forward button yellow Rewind button blue Button frame Button frame shaft Button blade x4 Button spring f x2 Button spring g x2 5M143 Head Base Assembly 5 144 5 146 5 150 5 151 5 213 Head Base Replay head stud Azimuth alignment stud Cable Tie stud Pinch Roller Frame post 5 157 Capstan Bearing Assembly 5M166 Brake Plate Assembly M167 Brake plate 5 170 Rewind Motor Assembly 5 158 Capstan bearing housing 5 159 Capstan bearings x2 5MI169 Brake Plate guide pin 50117 5 186 5 106 Generator Rewind motor Rewind Motor Pulley Cable Tie 150mm 5M208 Deck Plate Assembly 5 155 5 157 5 163 5 169 5 192 5 209 5 210 5 211 5 212 5 214 5 256 Latch plate posts x2 Capstan Bearing Assembly Flywheel support post x3 Brake plate guide pins x3 Reel Shaft Assembly x2 Deck Plate Cassette Support stud x2 Cassette location pin x2 Head Bases Guide Pin x3 Cct board support post Clutch swivil pin Mabuchi EG 510D 6F2 6v 2400rpm M1300D x 6 5 x 2 5 bore M11 2 x 2 5 2 E clip Pressed steel Pressed steel Mabuchi RF 3
8. 70 15370 MESSENGER PLAYER PARTS LIST A C POWER SUPPLY ASSEMBLY NO P100 No PART DESCRIPTION 5P101 Transformer 110 24v 60Hz 7v x 2 250mA 5P102 A C Socket Hosiden type No 5 0438 5P103 A C Socket back cover Hosiden type No 5 0438 03 010 5P104 Selector plate Moulded glass filled nylon 5P107 Cable Tie x3 5P108 A C Power cord 5P109 Loom sleeve M8 O D X 20mm PVC tubing 5P110 Cable insulation sleeve Cable tie with screw hole 5P112 Pin connector 3303 108 Adilam 5P113 Terminal clip small 3400 113 Adilam 5P114 Terminal clip large 3400 111 Adilam PILXCPY PIlA M Invert for 110 MESSENCER TI DAG 08 Rev A feb 1983 Rev C Nov 198 8210 B218 Circuit Board Assy 8601 CIRCUIT BOARD ASSEMBLIES B601 amp B602 5B601 Circuit Board Assembly plain 5B600 Circuit Board ex supplier 5B202 Volume Control wheel 5B208 Side plate 5B213 Pin connector 3 pin 5B214 Polarised Header 5501 Volume Control screw M1 7 5 machine screw 5B602 Circuit Board Assembly power 5B601 Circuit Board Assembly plain 5B218 Pin connector 4 pin 5B215 Voltage Regulator 5B216 Regulator diode 5B217 Capacitor 1000uF 16V 5B219 Side Plate Assembly plain 5B220 Side Plate Assembly power 5B601 Cct brd assmy plain 5B602 Side Plate Assembly power 5B207 Dress ring 5B207 Dress Ring 5B208 Side Plate 5B208 Side Plate 59 1 91193159 MSN 311583 61 908 IHN 31UAINd IN
9. I 5941940934 39Ufl9NU 1 A66 2 6 Nid N3MOd SNIUN HLIM NOISN3A 1104 E waste 1 21 Z8 WHl WUHOSIG DILYWSHDS ABO 9 NId 4n uj 8 01 190909 9 b TOZ Nid 90 TQ ABG 2 2 Nid 6578 20 A 99 H Nid 231 110M S g 140 8 JI Ja Dads S3981104 TJI 4 dd AM 8 3 0 ads 1X3 95 E gr JO01DJaugst oe 4 4 m I u9nqon JO01oJas8ua sdi lyd Pa _ we 894 gt as 39001 1 112 SP i 4188 suug ggg D OB3H 3 AS Er dd 7 N 5 um L ja 6 221 all pig gee _1_ Jau 0Jjsup J 55 gaat 1 m UA zm d Wee 3 b ABAS 4 a nU l except that non power models may have ions are identica Power and non power vers components IC2 D3 D5 C19 omitted Note MABUCHI GENERATOR WITH POWER LEAF SWITCH B MABUCHI GENERATOR WITHOUT POWER TO REMOVE GENERATOR LEAD FROM CONNECTOR SMALL 9 98 ORNER OR BLADE
10. MESSENGER II HAND WIND CASSETTE PLAYER SERVICE MANUAL GLOBAL RECORDINGS NETWORK AUSTRALIA Locked Bag 9019 Castle Hill NSW 1765 AUSTRALIA Email au globalrecordings net Phone 61 2 9899 2211 Fax 612 9899 2602 A C N 000 260 033 Revised June 2004 HAND WIND CASSETTE PLAYER SERVICE MANUAL INTRODUCTION Language Recordings has produced the Messenger II player because of the worldwide demand from missions and churches for a compact reliable cassette player that is not dependent on batteries or other costly power sources The purpose of this service manual is to provide the necessary technical information parts lists and drawings for those who will be doing in service repairs and maintenance to these players The technical descriptions have been kept as simple as possible and have been prepared with the non technical person in mind As well as providing this Service Manual and any necessary spare parts we believe in the concept that prevention is better than cure and we strongly recommend that where any Messenger II players are put into use that those using them should be given careful instructions in the basic care and maintenance of those players See of Cassette Players on operating instructions leaflet The Messenger II Player is produced in two different formats a Player Designation LRI 03M Plain Mabuchi i e Mabuchi Generator b LRI 03MP Mabuchi
11. VADTH Le MESSENGER PLAYER TROUBLE SHOOTING GUIDE The following is an outline of some possible causes of faults that may occur in the player SYMPTOM POSSIBLE CAUSE 1 No Action when operating from external power No power to player not switched on at power source Play button not depressed batteries flat broken power lead Switches dirty Motor belt worn or broken Motor faulty 2 No Action when Not cranking fast enough operating by hand Generator belt worn or stretched Generator mechanism worn out Faulty generator 3 No sound Tape finished jammed or broken Wiring joints faulty Volume control not turned up or faulty Speaker faulty Circuit board faulty Head faulty 4 Sound not clear worn or old Head dirty or worn Head alignment incorrect Low power supply Capstan bent 5 Speed slow or irregular Cassette faulty or jammed Generator or motor belt slipping cluth worn out Motor faulty Capstan bent Faulty pinch roller assembly 6 Speed too fast High supply voltage Pinch Roller not contacting capstan Motor faulty 7 Tape winds around capstan shaft Dirty capstan and pinch roller Faulty or mal adjusted take up clutch spindle seized bent or faulty Cassette tape not running freely in housing 8 Grinding noise when cranking Worn gea
12. amp 3 d Test Tapes 6 3 KHz at 15dB for Head Azimuth KHz at OdB for current consumption amp output level e 6v regulated power supply or 6v battery pack Fig 1 amp 3 Note Language Recordings is prepared to supply any of the above equipment to those who do not have ready access to such 2 Optional a Oscilloscope b Frequency counter desirable for major servicing c Cassette Torque Meter centres d Signal Generator helpful for trouble shooting of circuit board MEASUREMENTS amp ALIGNMENT 1 Supply voltage for testing 0 2v Measure the voltage across supply used for testing with 1Khz tape playing at full volume into dummy load fitted to external speaker socket If the voltage is outside of tolerance incorrect readings may be obtained for other tests 2 Generator Output Voltage Must be over 4 5v Measure voltage across the Generator Leads at the Circuit Board while playing 1 KHz tape at full volume into dummy load and cranking at normal speed 3 Playback Head Azimuth Adjustment NOTE A dot on the Name Plate Label C120 indicates the location of a hole in the Front Case provided for the insertion of a small screwdriver to adjust the head alignment screw After cleaning and demagnetising playback head adjust the volume control to maximum and use 6 3KHz 154 test tape to adjust the head azimuth Adjust output to maximum reading and when satisfied place some contact cement on srew heads t
13. d plugged into the external speaker socket With the volume at maximum the current should be approximately 200mA If current is excessively high check for free movement of mechanical parts especially the capstan flyhweel assembly and the pinch roller 7 Wow and Flutter Less than 2 Play 1 KHz tape and listen for clear tone or observe wave stability on oscilloscope Set up the Oscilloscope as for Azimuth Alignment and check stability at the right hand side of the screen Variation should not exceed 2 of screen width Rapid fluctuation usually indicates a bent capstan while slower fluctuation about 1 second duration would indicate a worn pinch roller or other drive component 8 Take up Torque 35 60 gm cm Measured with cassette torque meter Too much torque tends to raise current consumption of the machine Low torque can cause tape to wrap around capstan TROUBLESHOOTING PROCEDURE INTRODUCTION The key to efficient effective repair is a logical approach to troubleshooting and diagnosing the fault The first step in any troubleshooting process is to examine carefully all the symtoms of the fault This investigation should guide us to a limited range of possible problem areas in the machine At the same time we need to eliminate areas that are functioning correctly This enables us to focus attention on a particular part of the machine and should help us to locate and rectify the fault as quickly as possible This first step could be called th
14. e mapping step since the effect is to map out the problem areas for further investigation It is important to do a complete mapping of the machine before proceeding to analyse each of the areas which may have caused the trouble Premature assessment of a fault without logical and thorough investigation can result in unnecessary removal of parts for observation needless replacement of good parts tampering with adjustments that should be left alone and in general wasting a lot of valuable time The service manual is an essential part of the troubleshooter s equipment The information provided in the drawings circuit diagrams block diagrams parts list etc will help us to quickly isolate a fault to a single area of the machine The novice or layman in the area of electronic repair should not be overawed by the apparent complexity of the service manual The manual has been prepared with the non expert in mind and we trust that the instructions given will be clear enough for all to follow Regular experience in maintenance and repair of the Messenger II will soon help the novice to become familiar with the parts of the machine most likely to give problems Those who only carry out repairs on odd Occasion s or in emergencies need to take special care and be aware that hasty action or diagnosis of the problems may lead to a lot more expense and time expended than is really necessary TROUBLESHOOTING PROCEDURE The three major areas of t
15. he troubleshooting map that need to be considered when working on a Messenger II player 1 The generator assembly 2 The cassette mechanism 3 The amplifier 1 The Generator Assembly The generator assembly is probably the most straight forward mechanism within the Messenger II player consisting of a drive train of gears and pulleys However it is subject to more wear than any other part of the machine and usually requires a greater amount of maintenance 2 The Cassette Mechanism The cassette mechanism can be further broken down into smaller areas e g Motor keyboard fast forward mechanism etc and each of these can be examined as separate entities Keep in mind that a machine takes a source of motion and processes it so as to fulfill some useful purpose For example the motor provides the motion necessary to move the tape within the cassette case It does this via a belt pulleys and wheels As another example a finger can be the source of movement It can be used to depress a key which then directs the motion from the motor to drive the tape forward into rewind play or if the stop key is depressed to halt all tape motion 3 The Amplifier When considring the amplifie we also need to take into account the playback head volume control extension speaker socket and speaker The magnetically encoded signal on the tape produces very weak signal in the playback head as it passes over it This is then amplified for the purpo
16. ip x 3 Motor screw sleeve x3 Drive motor assembly Playback head Pinch roller assembly Capstan flywheel assembly Drive belt Leaf switch x2 Flywheel assembly Pinch roller frame spring Head base assembly Head base spring Azimuth alignment spring Latch plate Latch plate spring Flywheel support plate Flywheel thrust bearing Brake plate assembly Brake plate spring Rewind motor assembly Rewind motor plate Rewind motor plate spring Take up Clutch spring Cassette tension spring Reel stand spring Reel stand 1 piece x2 Reel stand rubber x2 Motor Cushion x3 Deck Plate Assembly Take up clutch assembly Cable Tie 100mm Leaf switch screw x2 Button frame screw x3 Rewind Motor Plate screw x2 Playback head alignment screw Circuit board screw Flywheel supt post screw x3 Side Plate screw x2 Drive Motor screw x3 Rewind motor screws x2 Reel Stand Washer Flywheel Assembly Washer Circuit board washer DESCRIPTION MI 5 M2 M2 M3 M3 Machined brass 75 x 1 2mm square section polyurethane 2 5 taptite screw M2 6x6 taptite screw M2 6x6 taptite screw M2x6 Philips machine screw M3x6 Philips machine screw M3x6 Philips machine screw M3x6 Philips taptite screw M2 7x6 machine screw M3x3 5 Philips machine screw Polyslider M2 2x4x0 3 Polyslider M2 2x4x0 3 M3 internal shakeproof washer SUB ASSEMBLIES 5 110 Drive Motor Assembly 5 109 Drive motor 5M111 Drive motor pulley 5P
17. ness of high frequency parts of the music Finally seal the alignment screw which contact cement Azimuth Alignment tapes may be obtained from Language Recordings Inc Australia e Before reassembling the machine check that the Leaf Switch operates properly when the Play Button Key is depressed Check that all moving parts of the mechanism are operating satisfactorily and check that all springs amp clips are in place and that screws are not loose N B Do not over tighten any screws on the mechanism 5 Generator Assembly G100 Servicing of the Generator Assembly G100 other than replacing the Belt is best carried out by replacing any faulty sub assembly with a new unit see parts list Individual parts may be replaced if it is determined that only one part is at fault 6 Closing Case When closing the case check carefully that the lead from the Generator to the circuit board 1 not touching any moving parts 7 Re checking Player Performance After repairs or adjustments are completed re check the relevant specifications of the player using the test procedures listed under Equipment amp Specifications for Testing Remove all dirt and dust from the player before closing the case and clean head capstan and pinch roller as described in the Operating Instructions GI50 Cronk Arm A amp seaoiy 1 CLOLA Pront Case Assy P100 Power Supply when needed C102A Back Case
18. no sound results place finger on both connections of the lead from the head where it3 joins the circuit board and turn volume up If no noise 18 heard the circuit board 1s possibly at fault and should be replaced 3 If Procedure 2 produces noise proceed to check the playback head and its connections Use a mutimeter to check the wires from the head to the amplifier board if the connections are satisfactory the head should be replaced Messenger II PLAYER PARTS LIST HOW TO ORDER PARTS I INTRODUCTION a SERIAL NUMBER Example of a serial No 09 89 M DCEC 00022 The serial number as found both inside and outside the player is composed of three main parts i Date of manufacture 09 89 Letter M Designates what generator type is used and whether power supply is included e g Mabuchi MP Mabuchi with Power Batch Letters These designate the revision batches of the main assemblies in the machine These are essential for supply of correct repalcement parts They are stamped on each assembly as indicated on the parts drawings and are listed in the serial number in the following order Case Assembly Generator Assembly Mechanism Assembly Circuit Board Assembly iii Machine No Identifies the particular machine e g Model Letters Batch Letters Machine No M DCEC 00022 b PARTS NUMBERS Example of a Part No 5G217 These consist of i A prefix letter 7507 which indicates which assembly the
19. o prevent vibration moving them Beware of false harmonic readings For this reading the oscilloscope is adjusted to the following settings Sweep range 100 1K Vertical gain 1 100 If an oscilloscope is unavailable a multimeter may be used 4 Motor Speed Adjustment Use the 1KHz 11dB tape to adjust the speed 1000 1010 2 on the digital frequency counter or digital multimeter with frequency range The adjustment is made by inserting a small screwdriver through the small hole in the top of the drive motor and turning the adjusting screw 5 Output Level Adjustment Using the 1KHz 11dB tape check the output level It should measure about 3 6 volts peak to peak If necessary adjust the variable resistor VR2 to achieve the desired output Too high a level will cause distortion clipping of the waveform If an oscilloscope is not available use the following procedure 1 Using an extension speaker plug and a piece of wire fit a dummy load of 8 2 ohms across the plug See Fig 2 Attach an AC volt meter with approximately 5 10 volts full scale deflection iii With a IKHz 11dB tape at maximum volumethe output should be 1 3 volts RMS Equal to 3 6 volts peak to peak 1v The same variable resistor adjustment VR2 can be used to obtain the right voltage reading 6 Current consumption 190 270 mA at Using the 1KHz 11dB tape and volume at minimum the current should be approximately 130mA played into an 8 2 ohm dummy loa
20. rm Assembly G150 by raising the handle and turning it anticlockwise opposite direction to the arrow This may require a sharp tap on the winding arm to begin the unwinding b Remove 5 screws 4 Case Screws C114 and one Handle Screw C115 in back of case Carefully pull the two halves fo the case apart while keeping them parallel to each other There may be some resistance at first until the Crank Shaft G109 is pulled through the Upper Crank Bearing C106 but pull the halves apart carefully as the generator wires may be broken It is now possible to unplug socket connector G141 on Mabuchi player without power and socket connector p112 on Mabuchi player with power from the circuit board and so separate the two halves of the player case Note Be careful not to pull on the wires Grasp the socket connector between thumb and forefinger from above and gently ease out with the help of a small screw driver 2 To Remove Mechanism 05 M200 and Circuit Board Assemblies See also drg M 03 M 05 a Buttons keys M102 M103 M104 M105 must be in OFF position b Desolder the two wires from the Speaker C103 and unplug PIN connector c Unscrew the Spacer Post C112 Motor Plate Screw S12 and the Mechanism Screw C116 located near the Clutch Assembly on the mechanism then lift the mechanism from the Front Case C101 3 Circuit Board Assembly B600 See also Drg M 97 a To Remove and Disassemle i Remove Circuit Board Screw M106 and Washer M107 Loosen
21. rs and or bearings Generator mechanism parts clashing 9 No sound from external speaker Speaker or wiring faulty Speaker socket faulty 10 Rewind faulty Rewind motor pully not contacting rubber ring of reel stand Faulty or dirty switch Faulty rewind motor or wiring
22. se of driving the speaker SAMPLE PROCEDURE 1 Symptoms of faulty player The Messenger II player will not operate at the correct speed when powered by its own generator Preliminary Diagnosis At first consideration you cannot help but be equally suspicious of the three main areas 1 The generator belt may have slackened with age or the generator itself may have failed 2 The cassette mechanism could have a faulty motor a jammed pinch roller etc 3 The amplifier could have a fault which causes it to drain an excess amount of current from the generator You need to eliminate as many areas of the as you can and concentrate on the one area at fault Procedure for investigation 1 Plug in an extenal 6v D C Source If the player now works correctly and does not draw excessive current then the generator most likely is at fault Conversely if the player still does not work then the generator is probably not at fault and the fault lies in one of the two other areas 2 Check the motor by disconnecting it from the circuit board and connecting it to a seperate 6v D C Power supply If motor and mechanism operate they are probably not at fault If motor speed appears to be slow investigate current consumption of motor or replace motor 3 Investigate current consumption of circuit board or replace circuit board By following this type of procedure you are successfully reducing the areas in which you need to look for
23. the fault and by carrying out tests like these on each of the possible areas of failure you will be able to locate and identify the offending component SAMPLE PROCEDURE 2 Symptoms of Faulty Player No sound Preliminary Diagnosis The fault is probably in the amplifier but before proceding to investigate this do the following quick checks 1 Check the cassette tape Is it broken jammed or simply stopped at its end 2 Check the cassette mechanism In play mode is the mechanism working correctly and pulling the tape across the playback head If both ofthe above checks show that the cassette and mechanism are satisfactory we can then move on to investigate the amplifier chain Note that there are 3 main sections of this a The speaker and extension speaker socket b The amplifier section of circuit board c The playback head refer also to block diagram fig 5 p 4 Procedure for Investigation 1 Plug an extension speaker into the extension speaker socket This effectively by passes the player s own speaker and introduces a new one If the extension speaker works then either the speaker in the player is faulty or else there is possibly a fault in the switch which is located within the extension speaker socket or a broken wire 2 If Procedure 1 produces no result move on to the amplifier board First check this visually to see if there are any obvious broken or loose connections These should be resoldered If
24. with Power i e Mabuchi Generator plus Mains Power Transformer TABLE OF CONTENTS Introduction eei eed 1 Equipment amp Specifications for 2 Trouble Shooting Procedure seen 3 5 Howto Order 5 terree Raa 6 Messenger II Disassembly and 7 8 Messenger II Player Assemblies Drawing M 02 9 Case Assembly Parts List and Drawing 03 10 11 Generator Assembly Parts List and Drawing 04 12 13 Mechanism Assembly Parts List and Drawing M 05 14 15 Power Supply Assembly Parts List and Drawing 06 16 Circuit Board Assembly Parts List and Drawing 07 17 Circuit Board Overlay and Schematic Diagram 10 18 Circuit Diagram M 09 sss 19 Generator and Power Wiring Diagram sese 20 21 Replacing Generator leads helpful 22 23 Trouble Shooting Guide sese 24 EQUIPMENT amp SPECIFICATIONS FOR TESTING NECESSARY EQUIPMENT 1 Basic a Multimeter With approx 2 3v A C range full deflection e g A meter with a sensitivity of at least 100k volt b Dummy Load 7 5 ohms resistance and lead or external speaker 8ohms c D C Power Test Lead To allow measurement of voltage amp current Ref Figure 1
Download Pdf Manuals
Related Search