Sony-BM87DST-tape-sm 电路图 维修手册.pdf

《Sony-BM87DST-tape-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Sony-BM87DST-tape-sm 电路图 维修手册.pdf（30页珍藏版）》请在收音机爱好者资料库上搜索。

1、Ver 1.0 2000.01 MICROFILM BM-87DST SERVICE MANUAL DICTATOR/ TRANSCRIBER SPECIFICATIONS US Model Model Name Using Similar MachanismNEW Tape Transport Mechanism TypeMB-87-59 RadioFans.CN 收音机爱 好者资料库 2 Specifications . 1 1.SERVICING NOTE. 2 2.GENERAL Features . 3 Precautions. 3 Operation Flow Chart . 4

2、Location and Function of Controls . 5 Preparation . 6 Dictating. 7 Transcribing . 9 Erasing . 11 Alarm System . 12 Telephone Recording . 12 3.DISASSEMBLY 3-1. Cabinet (Rear) Assy , Cabinet (Front) ASSY . 13 3-2. Main Board, Connecter (12P) Board . 13 3-3. LED Board. 14 3-4. Mechanism Deck . 14 3-5.

3、Servo Board, “Head Magnetic (REC/PB/Erase) (HRP901)”, Motor (F/R) ASSY (M902). 15 3-6. Belt (FWD), Belt (F/R). 15 3-7. Motor (FWD) ASSY(M901) . 16 4.MECHANICAL ADJUSTMENTS. 17 5.ELECTRICAL ADJUSTMENTS. 18 6.DIAGRAMS 6-1. Explanation of IC Terminals. 19 6-2. Block Diagram. 21 6-3. Printed Wiring Boar

4、ds (Servo Section) . 23 6-4. Schematic Diagram (Servo Section). 25 6-5. Printed Wiring Boards (Main Section) . 28 6-6. Schematic Diagram (Main Section) . 31 7.EXPLODED VIEWS 7-1. Cabinet Section. 35 7-2. Mechanism Deck Section (1) (MB-87-59) . 36 7-3. Mechanism Deck Section (2) (MB-87-59) . 37 8.ELE

5、CTRICAL PARTS LIST.38 SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMEN

6、TS PUBLISHED BY SONY. TABLE OF CONTENTS Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be dam- aged by heat. SECTION 1 SERVICING NOTE NOTES FOR REPAIRING 1.POWER (S101) Switch The POWER switch is not for turning O

7、N/OFF the power source. Pay attention when repairing even the POWER switch is turned off. The states when turning off the POWER switch are as follows. 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 ite

8、ms from “a” to “c” are controlled by the microcomputer which makes the pin 38 of IC109 (microcomputer) become Low level. 2.Be careful the short circuit when repairing since the power supply circuit does not have any protection devices. Please note that the current shut down (D108) will be work when

9、the power connected to the opposite way. 3.Crack of Flywheel Gear and Cam Gear Do not turn the Flywheel counterclockwise. The flywheel gear and cam gear may be crack when turn the flywheel counterclockwise. cam gear motor (FWD) (M901) flywheel RadioFans.CN 收音机爱 好者资料库 3 SECTION 2 GENERAL This section

10、 is extracted from instruction manual. RadioFans.CN 收音机爱 好者资料库 4 5 6 7 8 9 10 11 12 13 SECTION 3 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. 3-1. CABINET (REAR) ASSY, CABINET (FRONT) ASSY 3-2. MAIN BOARD, CONNECTOR (12P) BOARD z The equipment can be removed usin

11、g the following pr ocedure . Cabinet (front) ASSY Cabinet (rear) ASSY Set Mechanism deck Servo board, “Head,magnetic (rec/PB/erase) (HRP901)”, Motor (F/R) ASSY (M902) Belt (FWD), Belt (F/R) LED board Main board, Connecter (12P) board Motor ASSY (FWD) (M901) 1 Screws (+BVTP 3x12) 2 Cabinet (front) AS

12、SY 1 Screws (+BVTP 3x12) Cabinet (rear) ASSY 3 5 7 1 Claw 2 Projection 4 Screws (+BVTP 3x6) 6 Screws (+P 2.6x8) Cabinet (rear) ASSY Main board Connector (12P) board Heat sink ASSY 14 3-3. LED BOARD 3-4. MECHANISM DECK 2 Cabinet (front) ASSY 1 Screws (+B 2x4) LED board 2 3 Cabinet (front) ASSY 1 Open

13、 Lid ASSY, cassette Mechanism deck 15 3-5. SERVO BOARD, “HEAD, MAGNETIC (REC / PB / ERASE) (HRP901)”, MOTOR (F/R) ASSY (M902) 3-6. BELT (FWD), BELT (F/R) 2 Head, magnetic (rec/PB/erace) (HRP901) 1 Screw (+BTP 2.6x6) 4 Screw (lock) 3 Screw (+P 2x2.5) 6 Claws Servo board Mechanism deck Motor (F/R) ASS

14、Y (M902) 7 5 1 Belt (FWD) 3 Belt (FWD) Belt (FWD) Belt (FWD) 2 Belt (F/R) Mechanism deck Mechanism deck Counter (tape) Flywheel ASSY Belt (F/R) Pulley (reflector) Idler(F/R) Motor (F/R) ASSY (M902) Motor (FWD) ASSY (M901) 16 3-7. MOTOR (FWD) ASSY (M901) 3 1 2 Motor (FWD) ASSY (M901) Mechanism deck C

15、ushion (M) 17 SECTION 4 MECHANICAL ADJUSTMENTS PRECAUTION 1. Clean the following parts with a denatured alcohol moistened swab : record/playback/erase headpinch roller rubber beltscapstan 2. Demagnetize the record/playback/erase head with a head demag- netizer. 3. Do not use a magnetized screwdriver

16、 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 the rated power supply voltage unless otherwise noted. Torque Measurement ModeTorque MeterMeter Reading ForwardCQ-102C 20 to

17、 45 g cm (0.28 to 0.62 oz inch) Fast Forward CQ-201B 80 to 200 g cm Rewind(1.12 to 2.77 oz inch) Forward CQ-102C 4 to 8 g cm Back Tension(0.056 to 0.11 oz inch) Tape Tension Measurement ModeTension MeterMeter Reading ForwardCQ-403A 100 to 170 g (3.53 to 5.99 oz) Forward Torque Adjustment Torque mete

18、rMeter readingProcedure Adjust the forward torque by CQ-102C 20 to 45 g cm replace the spacer shown in (0.28 to 0.62 oz inch) below chart. Spacer Part No.t 3-307-493-010.1 3-307-493-110.15 3-307-493-210.2 3-307-493-310.25 Head Height Adjustment Procedure : 1. Insert the mirror cassette (CQ-009C). 2.

19、 In playback mode and viewing from the front, adjust the head heights to eliminate tape curl and tape twist at shown by arrows. 3. After the adjustments, apply suitable locking compound to screws. Part No.t 3-578-138-010.1 3-578-138-110.2 nylon washer (Taku-up side) reflector yoke plate reel table m

20、agnet tape head (rec / PB / erase) Shim, head height adjustment tape guide 18 PRECAUTION 1. Switches and controls should be to set to the positions as fol- lows unless otherwise specified. Switch positions POWER switch: ON AUTO STOP switch: ON SPEAKER switch: BULT-IN TONE control: max (H) VOLUME con

21、trol: mechanical mid SPEED CONTROL switch: OFF REVERSE TIME control: 0 2. Standard Input Level : TELEPHONE PICKUP jack : 300 0.77 mV (-60 dB) 3. Standard Output Level : Speaker: 8 0.775 V (0 dB) SECTION 5 ELECTRICAL ADJUSTMENTS Record / playback / erase Head Azimuth Adjustment Procedure : 1. Mode :

22、Playback (LISTEN) earphone jack 10k level meter test tape P-4-A063 (6.3kHz, 10dB) 2. Turn the adjustment screw to obtain the maximum reading on level meter. Adjustment should be finished with the screw in tightening di- rection. 3. After the adjustment, lock the adjustment screw with suitable lockin

23、g compound. Adjustment Location : record / playback / erase head Tape Speed Adjustment Setup : Mode : Playback (LISTEN) test tape WS-48 (3kHz, 0dB) tape end portion frequency counter earphone jack Procedure : SPEED CONTROL switch : OFF 1. TAPE SPEED switch : 4.8cm/s Adjust RV602 to obtain a 3,010Hz

24、frequency reading. Standard value : 3,000 - 3,020Hz 2. TAPE SPEED switch : 2.4cm/s Adjust RV601 to obtain a 1,505Hz frequency reading. Standard value : 1,500 - 1,510Hz Adjustment Location : servo board mechanism deck servo board RV602 : Tape speed Adjustment (4.8cm/s) RV601 : Tape speed Adjustment (

25、2.4cm/s) adjustment screw head (rec / PB / erase) 19 Pin No.Pin nameI/ODescription 1 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). 24No

26、t used (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 : 5.9V 31BRK-PG-OUTOBrake plunger output. Normal : 6.0 V STOP from FF/REW : FF/RE

27、W STOP 60ms0V 32STOP-PG-OUTOStop plunger output. Normal : 0 V STOP from FWD : FWD STOP 60ms0V 33VSSGND 34FWD-PG-OUTOFWD plunger output. At FWD : “ H ” At the other : “ L ” 35FF-M-OUTO FF/REW motor output. 36REW-M-OUTO 37A-OFF-OUTO Motor Auto-off output. Motor Auto-off (no cassette or after three min

28、utes after STOP) : “ H ” At the other : “ L ” 38STAND-BYIPOWER switch input. POWER switch ON : “ H ” POWER switch OFF : “ L ” 39TAB-INI TAB (erase proof) detection switch input. Cassette with TAB : “ L ” Cassette without TAB : “ H ” 40MC-INICassette detection switch input. With a cassette : “ L ” Wi

29、thout a cassette : “ H ” 41CAS-INICassette detection switch input. With a cassette : “ L ” Without a cassette : “ H ” 42SRIS reel signal input. 43TRIS reel signal input. 44DICT-INI HU-DICT key input. At DICT key input of the hand control unit (HU-80) : “ L ” At the other : “ H ” 45LTR-DETI LTR signa

30、l input. Count the rectangular pulse with microcomputer SECTION 6 DIAGRAMS 6-1. EXPLANATION OF IC TERMINALS IC109 PD75308GF-J16-3B9 (SYSTEM CONTROL) At motor FFAt motor REWAt the other Pin35LHH Pin36HLH LTR At FF/REW600 to 4,800HZ 20 Pin No.Pin nameI/ODescription 46LTR-OUTO LTR signal output. At LTR

31、 oscillating : 5.3V Output 80Hz for three seconds. At the other : 5.3V 47REC-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 : 5.3V 2.05 kHz 50 53KIN

32、 0 KIN 3Ikey scan input. 54VDDPositiv power source terminal of the microcomputer. 55XT1IMicrocomputer operation mode selection input. (Connect to VDD). 56XT2Not used (OPEN). 57NCNot used. Connect to VDD 58X1IInput for clock oscillation (4.19MHz). 59X2OOutput for clock oscillation (4.19MHz). 60HU-LIS

33、-INI HU-LISTEN key input. At LISTEN key-in of the hand control 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 outp

34、ut. At LISTEN, DICT, TEL-REC : “ H ” At the other : “ L ” 64FS-INI HU-FS key input. At FS key-in of the hand control unit (HU-80) : “ L ” At the other : “ H ” 65PR-INI Foot switch LISTEN key input. At LISTEN key-in of the foot control unit (FS-75) : “ L ” At the other : “ H ” 66SEC-INNot used (Conne

35、ct to VDD). 67LTR-INI HU-LTR key input. At LTR key-in of the hand control unit (HU-80) : “ L ” At the other : “ H ” 68RESETIMicrocomputer reset input. Normal : “ H ” 69 80S0 S11Not used (OPEN). 21 22 BM-87DST 6-2. BLOCK DIAGRAM Note: Signal path. E: PB a: REC 02 R601 R647 R646 R648 23456789 A 1 B C

36、D E F G SERVO BOARD PM902 FWD PLUNGER M M901 FWD MOTOR YEL (W) ORG (V) RED (U) BRN (COM) W V U COM D605 Q611 Q604Q606 Q613 Q619 Q617 Q615 Q608 Q614Q616 R633 R622R624 R623 R621 R634 J612 C605 C603 C608 C601 C602 C609 C610 Q603Q605 M902 FF/REW MOTOR M WHTGRY R626 R627 R629 R630 R640 R646 R631 R635 R61

37、3 R632 R638 R605 R603 R604 R649 R619 R620 R618 R615 R645 R612 R650 R636 R625 R639 R628 R637 C615 C611 J613 C613 Q609 Q607 PH601 157 14108 IC602 157 14108 IC603 D604D606 Q612 Q610 J615 J614 C614 THP602 THP601 PM901 STOP PLUNGER PM903 BRAKE PLUNGER BLK BLK WHT RED R641 1 5 IC604 15 13152024 1012 IC601

38、 R602 J611 Q601Q618 D601 C MAIN BOARD CN108 (Page 30) BRN RED ORG YEL WHT BLU B MAIN BOARD CN107 (Page 30) BRN RED ORG YEL WHT A MAIN BOARD CN106 (Page 30) BRN RED WHT ORG YEL BLU R616 11 (11) 1-677-763- RV602 RV601 BLK BLK S602 (TAB DET) S601 (CASSETTE DET) 23 24 BM-87DST D601B-6 D604G-6 D605B-2 D6

39、06G-6 IC601B-4 IC602E-6 IC603F-3 IC604D-4 Q601B-6 Q602C-2 Q603E-3 Q604E-3 Q605E-3 Q606E-3 Q607G-4 Q608C-2 Q609G-4 Q610F-6 Q611B-2 Q612G-5 Q613E-5 Q614C-3 Q615C-3 Q616C-3 Q617C-2 Q618B-6 Q619B-6 Ref. No.Location z Semiconductor Location 6-3. PRINTED WIRING BOARDS (SERVO SECTION) Note: X : parts extra

40、cted from the component side. b : Pattern of the rear side. 25 27 26 BM-87DST 6-4. SCHEMATIC DIAGRAM (SERVO SECTION) 1 M901 VOLT/DIV : 0.5 V AC TIME/DIV : 2 msec 2.8Vp-p 3.8 msec z Waveform Note: All capacitors are in F unless otherwise noted. pF: F 50 WV or less are not indicated except for electro

41、lytics and tantalums. All resistors are in and 1/4 W or less unless otherwise specified. U : B+ Line. H : adjustment for repair. Power voltage is dc 9 V and fed with regulated dc power supply from external power voltage jack (J103). Voltages and waveforms are dc with respect to ground under no-signa

42、l 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

43、r to waveforms. 28 30 29 BM-87DST 6-5. PRINTED WIRING BOARDS (MAIN SECTION) D101F-4 D102F-3 D104C-3 D105D-5 D106D-5 D107D-7 D108B-3 D109C-3 D110C-10 D111C-10 D112G-10 D113D-10 D114C-11 D115D-10 D116D-11 D117D-5 D118D-5 D119D-5 D120C-10 D121F-8 LE301A-9 LE302A-8 LE303A-8 IC101G-8 IC102H-5 IC103H-4 IC

44、104F-5 IC105E-4 IC106E-4 IC107F-7 Ref. No.Location z Semiconductor Location IC108C-2 IC109D-8 IC110G-3 IC111G-7 IC201G-6 Q102E-3 Q103C-6 Q104C-7 Q105C-5 Q107D-5 Q108C-6 Q109C-6 Q110C-6 Q111D-6 Q112D-6 Q113C-8 Q114C-8 Q115E-7 Q116E-7 Q118C-5 Q119G-9 Q120C-9 Q121E-7 Q122G-8 Q123F-8 Q124F-8 Q125F-8 Q126F-8