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1、Ver 1.0 2000.01MICROFILMBM-87DSTSERVICE MANUALDICTATOR/ TRANSCRIBERSPECIFICATIONSUS ModelModel Name Using Similar MachanismNEWTape Transport Mechanism TypeMB-87-59RadioFans.CN 收音机爱 好者资料库 2 Specifications . 11.SERVICING NOTE. 22.GENERALFeatures . 3Precautions. 3Operation Flow Chart . 4Location and Fu
2、nction of Controls . 5Preparation . 6Dictating. 7Transcribing . 9Erasing . 11Alarm System . 12Telephone Recording . 123.DISASSEMBLY3-1. Cabinet (Rear) Assy , Cabinet (Front) ASSY . 133-2. Main Board, Connecter (12P) Board . 133-3. LED Board. 143-4. Mechanism Deck . 143-5. Servo Board, “Head Magnetic
3、 (REC/PB/Erase) (HRP901)”, Motor (F/R) ASSY (M902). 153-6. Belt (FWD), Belt (F/R). 153-7. Motor (FWD) ASSY(M901) . 164.MECHANICAL ADJUSTMENTS. 175.ELECTRICAL ADJUSTMENTS. 186.DIAGRAMS6-1. Explanation of IC Terminals. 196-2. Block Diagram. 216-3. Printed Wiring Boards (Servo Section) . 236-4. Schemat
4、ic Diagram (Servo Section). 256-5. Printed Wiring Boards (Main Section) . 286-6. Schematic Diagram (Main Section) . 317.EXPLODED VIEWS7-1. Cabinet Section. 357-2. Mechanism Deck Section (1) (MB-87-59) . 367-3. Mechanism Deck Section (2) (MB-87-59) . 378.ELECTRICAL PARTS LIST.38SAFETY-RELATED COMPONE
5、NT WARNING!COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITHMARK 0ON THE SCHEMATIC DIAGRAMS AND IN THE PARTSLIST ARE CRITICAL TO SAFE OPERATION.REPLACE THESE COMPONENTS WITH SONY PARTS WHOSEPART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR INSUPPLEMENTS PUBLISHED BY SONY.TABLE OF CONTENTSNotes on chi
6、p component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be dam-aged by heat.SECTION 1SERVICING NOTENOTES FOR REPAIRING1.POWER (S101) SwitchThe POWER switch is not for turning ON/OFF the powersource. Pay attention when repairing even t
7、he POWERswitch is turned off. The states when turning off the POWER switch are asfollows.a. Motors (M901, 902) will be stopped.b. Plungers (PM901 to 903) will be turned off.c. Amplifier output will be cut-off by muting on.The above items from “a” to “c” are controlled by themicrocomputer which makes
8、 the pin 38 of IC109(microcomputer) become Low level.2.Be careful the short circuit when repairing since the powersupply circuit does not have any protection devices.Please note that the current shut down (D108) will be workwhen the power connected to the opposite way.3.Crack of Flywheel Gear and Ca
9、m GearDo not turn the Flywheel counterclockwise.The flywheel gear and cam gear may be crack when turn theflywheel counterclockwise.cam gear motor (FWD) (M901)flywheelRadioFans.CN 收音机爱 好者资料库 3 SECTION 2GENERALThis section is extracted frominstruction manual. 4 5 6 7 8 9 10 11 12 13 SECTION 3DISASSEMB
10、LYNote : Follow the disassembly procedure in the numerical order given.3-1. CABINET (REAR) ASSY, CABINET (FRONT) ASSY3-2. MAIN BOARD, CONNECTOR (12P) BOARDz The equipment can be removed using the following pr ocedure .Cabinet (front) ASSYCabinet (rear) ASSYSetMechanism deckServo board, “Head,magneti
11、c (rec/PB/erase) (HRP901)”,Motor (F/R) ASSY (M902)Belt (FWD), Belt (F/R) LED boardMain board, Connecter (12P) boardMotor ASSY (FWD) (M901)1 Screws (+BVTP 3x12)2Cabinet (front) ASSY1 Screws (+BVTP 3x12)Cabinet (rear) ASSY3571 Claw2 Projection4 Screws (+BVTP 3x6)6 Screws (+P 2.6x8)Cabinet (rear) ASSYM
12、ain boardConnector (12P) boardHeat sink ASSY 14 3-3. LED BOARD3-4. MECHANISM DECK2Cabinet (front) ASSY1 Screws (+B 2x4)LED board23Cabinet (front) ASSY1 OpenLid ASSY, cassetteMechanism deck 15 3-5. SERVO BOARD, “HEAD, MAGNETIC (REC / PB / ERASE) (HRP901)”, MOTOR (F/R) ASSY (M902)3-6. BELT (FWD), BELT
13、 (F/R)2Head, magnetic(rec/PB/erace)(HRP901)1 Screw (+BTP 2.6x6)4 Screw (lock)3 Screw (+P 2x2.5)6 ClawsServo boardMechanism deckMotor (F/R) ASSY (M902)751 Belt (FWD)3 Belt (FWD)Belt (FWD)Belt (FWD)2 Belt (F/R)Mechanism deckMechanism deckCounter (tape)Flywheel ASSYBelt (F/R)Pulley (reflector)Idler(F/R
14、)Motor (F/R) ASSY (M902)Motor (FWD) ASSY (M901) 16 3-7. MOTOR (FWD) ASSY (M901)312Motor (FWD) ASSY (M901)Mechanism deckCushion (M) 17 SECTION 4MECHANICAL ADJUSTMENTSPRECAUTION1. Clean the following parts with a denatured alcohol moistenedswab :record/playback/erase headpinch rollerrubber beltscapsta
15、n2. Demagnetize the record/playback/erase head with a head demag-netizer.3. Do not use a magnetized screwdriver for the adjustments.4. After the head hight adjustments, apply suitable locking com-pound to the parts adjusted.5. The measurement and adjustments should be performed with therated power s
16、upply voltage unless otherwise noted.Torque MeasurementModeTorque MeterMeter ReadingForwardCQ-102C20 to 45 g cm(0.28 to 0.62 oz inch)Fast ForwardCQ-201B80 to 200 g cmRewind(1.12 to 2.77 oz inch)ForwardCQ-102C4 to 8 g cmBack Tension(0.056 to 0.11 oz inch)Tape Tension Measurement ModeTension MeterMete
17、r ReadingForwardCQ-403A100 to 170 g(3.53 to 5.99 oz)Forward Torque Adjustment Torque meterMeter readingProcedureAdjust the forward torque byCQ-102C20 to 45 g cmreplace the spacer shown in(0.28 to 0.62 oz inch)below chart.SpacerPart No.t3-307-493-010.13-307-493-110.153-307-493-210.23-307-493-310.25He
18、ad Height AdjustmentProcedure :1. Insert the mirror cassette (CQ-009C).2. In playback mode and viewing from the front, adjust the headheights to eliminate tape curl and tape twist at shown by arrows.3. After the adjustments, apply suitable locking compound toscrews.Part No.t3-578-138-010.13-578-138-
19、110.2nylon washer(Taku-up side)reflectoryoke platereel table magnet tapehead(rec / PB / erase)Shim, head heightadjustmenttape guide 18 PRECAUTION1. Switches and controls should be to set to the positions as fol-lows unless otherwise specified. Switch positionsPOWER switch: ONAUTO STOP switch: ONSPEA
20、KER switch: BULT-INTONE control: max (H)VOLUME control: mechanical midSPEED CONTROL switch: OFFREVERSE TIME control: 02. Standard Input Level :TELEPHONE PICKUP jack : 300 0.77 mV (-60 dB)3. Standard Output Level :Speaker: 8 0.775 V (0 dB)SECTION 5ELECTRICAL ADJUSTMENTSRecord / playback / erase Head
21、Azimuth AdjustmentProcedure :1. Mode : Playback (LISTEN)earphone jack10klevel metertest tapeP-4-A063(6.3kHz, 10dB)2. Turn the adjustment screw to obtain the maximum reading onlevel meter.Adjustment should be finished with the screw in tightening di-rection.3. After the adjustment, lock the adjustmen
22、t screw with suitablelocking compound.Adjustment Location : record / playback / erase headTape Speed AdjustmentSetup :Mode : Playback (LISTEN) test tapeWS-48(3kHz, 0dB)tape end portionfrequency counterearphone jackProcedure :SPEED CONTROL switch : OFF1. TAPE SPEED switch : 4.8cm/sAdjust RV602 to obt
23、ain a 3,010Hz frequency reading.Standard value : 3,000 - 3,020Hz2. TAPE SPEED switch : 2.4cm/sAdjust RV601 to obtain a 1,505Hz frequency reading.Standard value : 1,500 - 1,510HzAdjustment Location : servo boardmechanism deckservo boardRV602: Tape speed Adjustment (4.8cm/s)RV601: Tape speed Adjustmen
24、t (2.4cm/s)adjustment screwhead(rec / PB / erase) 19 Pin No.Pin nameI/ODescription1 12S12 S23Not used (OPEN).13 16KOUT 0 KOUT 3OKey scan output.17MA50 - OUTNot used (OPEN).18Not used (OPEN).194.8 / 2.4 - OUTOTape speed change signal output.20Not used (OPEN).21 23COM0 COM2Not used (OPEN).24Not used (
25、OPEN).25LCD - BIASConect to VSS.26 28VLCD0 VLCD2Conect to VSS.29FE-OUTOFast-Erase control output. At Fast-Erase : “ L ” At the other : “ H ”30BIAS-OUTOBIAS control output. At DICT, TEL-REC : 0V At the other : 5.9V31BRK-PG-OUTOBrake plunger output. Normal : 6.0 V STOP from FF/REW : FF/REWSTOP60ms0V32
26、STOP-PG-OUTOStop plunger output. Normal : 0 V STOP from FWD : FWDSTOP60ms0V33VSSGND 34FWD-PG-OUTOFWD plunger output. At FWD : “ H ” At the other : “ L ” 35FF-M-OUTOFF/REW motor output. 36REW-M-OUTO37A-OFF-OUTOMotor Auto-off output. Motor Auto-off (no cassette or after three minutes after STOP) : “ H
27、 ” At the other : “ L ”38STAND-BYIPOWER switch input. POWER switch ON : “ H ” POWER switch OFF : “ L ”39TAB-INITAB (erase proof) detection switch input.Cassette with TAB : “ L ” Cassette without TAB : “ H ”40MC-INICassette detection switch input. With a cassette : “ L ” Without a cassette : “ H ”41C
28、AS-INICassette detection switch input. With a cassette : “ L ” Without a cassette : “ H ”42SRIS reel signal input.43TRIS reel signal input. 44DICT-INIHU-DICT key input.At DICT key input of the hand control unit (HU-80) : “ L ” At the other : “ H ”45LTR-DETILTR signal input. Count the rectangular pul
29、se with microcomputerSECTION 6DIAGRAMS6-1. EXPLANATION OF IC TERMINALSIC109 PD75308GF-J16-3B9 (SYSTEM CONTROL)At motor FFAt motor REWAt the otherPin35LHHPin36HLHLTRAt FF/REW600 to 4,800HZ 20 Pin No.Pin nameI/ODescription46LTR-OUTOLTR signal output. At LTR oscillating : 5.3VOutput 80Hz for three seco
30、nds.At the other : 5.3V47REC-OUTODICT, TEL-REC control output. At DICT, TEL-REC : “ H ” At the other : “ L ”48TEL-OUTOTEL-REC control output. At TEL-REC : “ H ” At the other : “ L ”49ALM-OUTOAlarm output. At alarm oscillating : 5.3V2.05 kHz 50 53KIN 0 KIN 3Ikey scan input.54VDDPositiv power source t
31、erminal of the microcomputer.55XT1IMicrocomputer operation mode selection input. (Connect to VDD).56XT2Not used (OPEN).57NCNot used. Connect to VDD58X1IInput for clock oscillation (4.19MHz).59X2OOutput for clock oscillation (4.19MHz). 60HU-LIS-INIHU-LISTEN key input. At LISTEN key-in of the hand con
32、trol unit (HU-80) : “ L ”At the other : “ H ”61BS-INIHU-BS key input. At BS key-in of the hand unit (HU-80) : “ L ” At the other : “ H ”62PB-OUTOPlayback control output. At LISTEN : “ H ” At the other : “ L ” 63MUTE-OUTOAmplifier mute output. At LISTEN, DICT, TEL-REC : “ H ” At the other : “ L ”64FS
33、-INIHU-FS key input. At FS key-in of the hand control unit (HU-80) : “ L ”At the other : “ H ”65PR-INIFoot switch LISTEN key input. At LISTEN key-in of the foot control unit (FS-75) : “ L ”At the other : “ H ”66SEC-INNot used (Connect to VDD). 67LTR-INIHU-LTR key input. At LTR key-in of the hand con
34、trol unit (HU-80) : “ L ”At the other : “ H ”68RESETIMicrocomputer reset input. Normal : “ H ”69 80S0 S11Not used (OPEN). 21 22 BM-87DST6-2. BLOCK DIAGRAMNote: Signal path.E: PBa: REC02R601R647R646R64823456789A1BCDEFGSERVO BOARD PM902FWDPLUNGERMM901FWDMOTORYEL(W)ORG(V)RED(U)BRN(COM)WVUCOMD605Q611Q60
35、4Q606Q613Q619Q617Q615Q608Q614Q616R633R622R624R623R621R634J612C605C603C608C601C602C609C610Q603Q605M902FF/REWMOTORMWHTGRYR626R627R629R630R640R646R631R635R613R632R638R605R603R604R649R619R620R618R615R645R612R650R636R625R639R628R637C615C611J613C613Q609Q607PH60115714108IC60215714108IC603D604D606Q612Q610J6
36、15J614C614THP602THP601PM901STOPPLUNGERPM903BRAKEPLUNGERBLKBLKWHTREDR64115IC60415131520241012IC601R602J611Q601Q618D601CMAIN BOARDCN108(Page 30)BRNREDORGYELWHTBLUBMAIN BOARDCN107(Page 30)BRNREDORGYELWHTAMAIN BOARDCN106(Page 30)BRNREDWHTORGYELBLUR61611(11)1-677-763-RV602RV601BLKBLKS602(TAB DET)S601(CAS
37、SETTE DET) 23 24 BM-87DSTD601B-6D604G-6D605B-2D606G-6IC601B-4IC602E-6IC603F-3IC604D-4Q601B-6Q602C-2Q603E-3Q604E-3Q605E-3Q606E-3Q607G-4Q608C-2Q609G-4Q610F-6Q611B-2Q612G-5Q613E-5Q614C-3Q615C-3Q616C-3Q617C-2Q618B-6Q619B-6Ref. No.Locationz Semiconductor Location6-3. PRINTED WIRING BOARDS (SERVO SECTION)
38、Note: X : parts extracted from the component side. b : Pattern of the rear side. 25 27 26 BM-87DST6-4. SCHEMATIC DIAGRAM (SERVO SECTION)1M901VOLT/DIV : 0.5 V ACTIME/DIV : 2 msec2.8Vp-p3.8 msecz WaveformNote: All capacitors are in F unless otherwise noted. pF: F50 WV or less are not indicated except
39、for electrolyticsand tantalums. All resistors are in and 1/4 W or less unless otherwisespecified. U : B+ Line. H : adjustment for repair. Power voltage is dc 9 V and fed with regulated dc powersupply from external power voltage jack (J103). Voltages and waveforms are dc with respect to groundunder n
40、o-signal conditions.no mark: LISTEN(): REW: FF Voltages are taken with a VOM (Input impedance 10 M).Voltage variations may be noted due to normal produc-tion tolerances. Waveforms are taken with a oscilloscope.Voltage variations may be noted due to normal produc-tion tolerances. Circled numbers refe
41、r to waveforms. 28 30 29 BM-87DST6-5. PRINTED WIRING BOARDS (MAIN SECTION)D101F-4D102F-3D104C-3D105D-5D106D-5D107D-7D108B-3D109C-3D110C-10D111C-10D112G-10D113D-10D114C-11D115D-10D116D-11D117D-5D118D-5D119D-5D120C-10D121F-8LE301A-9LE302A-8LE303A-8IC101G-8IC102H-5IC103H-4IC104F-5IC105E-4IC106E-4IC107F
42、-7Ref. No.Locationz Semiconductor LocationIC108C-2IC109D-8IC110G-3IC111G-7IC201G-6Q102E-3Q103C-6Q104C-7Q105C-5Q107D-5Q108C-6Q109C-6Q110C-6Q111D-6Q112D-6Q113C-8Q114C-8Q115E-7Q116E-7Q118C-5Q119G-9Q120C-9Q121E-7Q122G-8Q123F-8Q124F-8Q125F-8Q126F-8Q201G-6Q202H-6Ref. No.LocationNote: X : parts extracted f
43、rom the component side. b : Pattern of the rear side.022345678910111213A1BCDEFGHC152C165C132C133C104CN101IC107C172C127C116C125C113C214C219C220C210C212C209C217Q201C140C147C141C201Q202C143C148C203C124C123C171C112C110C107C105C118C153C154C157C207CN201111112415759561523456789101112CN103CN102J103J101T101C
44、N105CN1083R144JP109JP110JP112JP113JP141JP140JP139JP155JP151JP180JP153JP152JP173JP174JP175JP176JP202JP200JP203JP204JP201JP199JP214JP193JP196JP195JP198JP171JP150JP149JP148JP170JP168JP165JP169JP197JP166JP167JP162JP187JP213JP185JP186JP183JP184JP163JP144JP145JP121JP119JP104JP103JP122JP123JP120JP102JP101J
45、P115JP117JP116JP118JP148JP147JP164JP143JP194JP192JP191JP190JP189JP188JP215JP172JP219JP206JP207JP223JP225JP224JP236JP242JP241JP235JP234JP233JP218JP216JP216JP228JP230JP229JP227JP237JP238JP240JP232JP231JP239JP243JP226JP209JP211JP212JP220JP222JP221JP224JP179JP178JP177JP208JP182JP210JP181JP205JP133JP134J
46、P154JP142JP137JP138JP161JP156JP158JP159JP160JP157JP136JP135JP114JP111JP128JP105JP127JP126JP125JP124JP108JP131JP128JP132JP107JP16JP130123IC108148IC1105148IC1035148IC102511581615109714IC111IC20181714IC1018658075701510152024IC109402530356441455055601571410IC104815101581615109714IC105IC1068D108D104D109Q
47、105D106Q107D117D118D105D102D101ECBECBECBECBQ119ECBQ102Q110ECB Q108ECBQ103ECBQ104ECBQ111D119ECBQ112ECB ECBQ122ECBECBECBQ116ECBECBECBQ125Q126Q124ECB Q120ECBQ123D121Q115Q118D107ECBECBECBQ121Q113Q114D114Q109D120 D110D116D111D1157654321D113LF101DC IN 9VTELEPHONEPICKUPCN201CONTROLUNIT1515 6L-CHR-CHHRP901R
48、EC/PLAYBACKERASE HEADS109FFMS108LISTENBS107STOPxS106REWmS110TELRECS111zERASES103AUTO STOPSTEREOR?ONR?OFFS112POSITION NO.(a:ON)S102SPEAKERBUILT INr?HANDS104SPEED CONTROLOFFR?ONSPEED+ T S105TAPE SPEED2.4R?4.8S101POWEROFFR?ONJ102iSP901SPEAKERCN104156CN106CN10715615211A(Page 24)2B(Page 24)3C(Page 24)SER
49、VO BOARDLED303POWERLED302REC/ERASELED301LTR INDEXLED BOARD 11(11)1-677-762-11(11)1-677-760-MAIN BOARD 12P CONNECTOR BOARD RV103D112REVERSE TIMES112TONERV101VOLUMERV10298765432142123401a2a3a?a4a5a?a6a?a7a?a?a8a9a?a13COMC155C156R160 R169C168C181C180C179C169C170R190R188R191R186C174C177C178C158R161R216C
50、221C159R196C166R194R195R181R180C167R182R179R177R193R192R159R129C164R197R133R130R116R123R114R110R131R125R109C109R106C122R115C114C130R113R108C111C108C106R107R121R117R119C119C120R102R104R105R103R200R120R118C126C117C121C115R187R162R172R167R132R173R171R170C131R124R219R138R140C134R142R143R166R164C160R224C
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