Sony-TCKB920S-tape-sm 维修电路原理图.pdf

MICROFILMSERVICE MANUALSTEREO CASSETTE DECKAEP ModelE ModelAustralian ModelModel Name Using Similar MechanismTC-KE500STape Transport Mechanism TypeTCM-190VB14SPECIFICATIONSTC-KB920SDolby noise reduction and HX Pro headroom ex-tension manufactured under license from DolbyLaboratories Licensing Corporation. HX Pro origi-nated by Bang & Olufsen.“DOLBY”, the double-D symbol a, and “HX PRO”are trademarks of Dolby Laboratories Licensing Cor-poration. Continued on next page RadioFans.CN 收音机爱 好者资料库 2 Flexible Circuit Board Repairing Keep the temperature of the soldering iron around 270 C dur-ing repairing. Do not touch the soldering iron on the same conductor of thecircuit board (within 3 times). Be careful not to apply force on the conductor when solderingor unsoldering.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.SAFETY-RELATED COMPONENT WARNING!COMPONENTS IDENTIFIED BY MARK ! OR DOTTEDLINE WITH MARK ! ON THE SCHEMATIC DIAGRAMSAND IN THE PARTS LIST ARE CRITICAL TO SAFEOPERATION. REPLACE THESE COMPONENTS WITHSONY PARTS WHOSE PART NUMBERS APPEAR ASSHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-LISHED BY SONY.MODEL IDENTIFICATION BACK PANEL 3-020-984-AEP Model: 0 ?Australian Model: 2 ?Malaysia, Singapore Model: 3 RadioFans.CN 收音机爱 好者资料库 3 TABLE OF CONTENTS1.GENERAL. 42.DISASSEMBLY.53.MECHANICAL ADJUSTMENTS. 94.ELECTRICAL ADJUSTMENTS. 105.DIAGRAMS5-1.Note for Printed Wiring Boards andSchematic Diagrams . 145-2.Printed Wiring Boards MD Section . 155-3.Schematic Diagram MD Section . 175-4.Printed Wiring Board MAIN Section . 195-5.Schematic Diagram MAIN Section (1/2). 215-6.Schematic Diagram MAIN Section (2/2). 235-7.Printed Wiring Board DOLBY-S Section . 255-8.Schematic Diagram DOLBY-S Section . 255-9.Printed Wiring Boards POWER Section . 275-10. Schematic Diagram POWER Section . 285-11. Printed Wiring Boards PANEL Section . 295-12. Schematic Diagram PANEL Section . 315-13. IC Pin Function Description . 336.EXPLODED VIEWS. 357.ELECTRICAL PARTS LIST. 40 4 SECTION 1GENERALLOCATION OF CONTROLS1 I/O (Power) button2 Remote control sensor3 PHONES jack4 Display panel5 Tape operation buttonsAMS* 0 button buttonAMS* ) buttonp buttonP PAUSE buttonR REC MUTING buttonr REC button6 Tape counter7 Counter buttonsRESET buttonMEMORY button8 Cassette holder9 EJECT button! AUTO CAL button! DOLBY NR switch! BIAS control! BALANCE control! CAL REC LEVEL control! MONITOR button! REC LEVEL control* AMS is an abbreviation for Automatic Music Sensor. 5 FRONT PANEL SECTIONMD ASSY SECTIONNote: Follow the disassembly procedure in the numerical order given.SECTION 2DISASSEMBLYCASEUnscrew the four case attachment seven tapping screws andremove the case.1three flat cables(CN803 805)2connector(CN704)4claw4claw3screw(BVTP3 8)2two connectors(CNP304, CN801)2five connectors(CNP301 303, 305, 306)3four screws(BVTP3 8)5front panel section4two screws(BVTT2.6 8)5two screws(BVTP2.6 8)6Remove the MD assy section to direction of arrow A.A2two claws3cassette lid assy2two claws1Push the eject button. 6 MAIN BOARDCASSETTE HOLDER (R) ASSY1connector(CN701)5three PC board holders4screw(BV/ring)2screw(BV/ring)4two screws(BVTP3 8)6MAIN board3bracket (TR)2boss4cassette holder (R)assy3shaft1torsion spring 7 FITTING BASE BLOCKHEAD1three screws(PTPWH2 23)Note: When installing,pull the FR beltand put around theclaws as shown below.Note: When installing, pull the capstan beltand put around the claws as shown below.2fitting base block1screw(B2 4)4five screws(B2 4)5record/playbackhead6head blacket7three RPH springs2erasehead3washer 8 AUDIO BOARD AND MOTOR1connector(CNP71)2flex ble board(CNP72)6capstan motor3claw5two screws(B2.6 3)7two screws(P2.6 2.8)9belt (FR)0ground plate8reel motor4audio board 9 SECTION 3MECHANICAL ADJUSTMENTSPRECAUTION1.Clean the following parts with a denatured alcohol-moistenedswab:record/playback/erase headpinch rollerrubber beltscapstanidler2.Demagnetize the record/playback head with a head demagne-tizer.(Head demagnetizer do not approach for the erase head.)3.Do not use a magnetized screwdriver for the adjustment.4.After the adjustments, apply suitable locking compound to theparts adjusted.5.The adjustments should be performed with the rated powersupply voltage unless otherwise noted. Torque MeasurementRecord/Playback Head Height/Declination AdjustmentProcedures:1.Test cassette: CQ-009C2.Insert the mirror cassette and put the unit in record/Playbackmode.1) Height Adjustment:Check to see if the tape is curling at the tape guide of the head.If it is curling, tighten screws A, B and C, respectively bythe same angle, moving the head so that it remains at the sameangle throughout the procedure. If it curls on the bottom sideof the mirror cassette (actually the inner side), tighten all thescrews equally; but loosen them if the tape begins to curl onthe top side. (outer side.)ModeTorque MeterMeter ReadingForwardCQ-102C30 to 65 gcm(0.42 to 0.90 ozinch)ForwardbackCQ-102C1 to 6 gcmtension(0.014 to 0.08 ozinch)FF/REWCQ-201B70 to 120 gcm(0.98 to 1.66 ozinch)2) Declination Adjustment:While in the record/playback position, set the back tension to0 (wind the supply reel with something thin like a pencil in acounterclockwise direction) and make sure there is no curlingor shifting (shifting up/shifting down) at the guide of therecord/playback head.Because shifting can only occur due to a difference in the widthof the tape and that of the tape guides (curling will otherwiseoccur), it is necessary to pay close attention since it can beeasily overlooked.When there is a shift, tighten screws B and C equally andchange the declination of the head. If the tape is shifting up,tighten the screws, and if it is shifting down, loosen them.Repeat the adjustments in steps 1) to 2) and fine adjust theheight and the declination.Adjustment Location: record/playback head outsideNormal(Record/playback head as seen from the side of the erasehead.)Curling on the innersideTighten screws A, B?and C.Curling on the outer sideLoosen screws A, B and C.insideABC 10 SECTION 4ELECTRICAL ADJUSTMENTSNote: The adjustment should be performed in the order given in the ser-vice manual. As a rule, adjustments about playback should be per-formed before those about recording.The adjustments should be performed before for both L-CH and R-CH. Switches and controls should be set as follows unless otherwisespecified.DOLBY NR, MPX FILTER switch: OFFMONITOR switch: Tape Standard Record:Deliver the standard input signal level to the input jack and setthe REC LEVEL control to obtain the standard output signallevel. Record Mode Standard Input Levelinput terminalLINE INsource impedance10 kinput signal level0.5 V (3.8 dB)Standard Output Leveloutput terminalLINE OUTload impedance47 koutput signal level0.5 V (3.8 dB)Test TapeTypeSignalUsed forP-4-A10010 kHz, 10 dBAzimuth AdjustmentP-4-L300315 Hz, 0 dBPlayback Level AdjustmentWS-48B3 kHz, 0 dBTape Speed Adjustment+set47 k LINE OUTLINE IN600 10 k attenuatorAF OSClevel meterRecord/Playback Head Azimuth AdjustmentProcedure:1.Mode: FWD playback2.Turn the adjustment screw for the maximum output levels. Ifthese levels do not match, turn the adjustment screw until bothof output levels match together within 1 dB.3.Phase CheckMode: playback4.After the adjustment, lock the screw with locking compound.Adjustment Location: Record/Playback head+set47 k LINE OUTlevel meterTest tapeP-4-A100(10 kHz, 10 dB)ScrewpositionL-CHpeakwithin1dBoutputlevelL-CH peakR-CH peakwithin1dBangleR-CHpeak+VH+Screen patternGoodWrongin phase 4590135180LINE OUTsetR-CHL-CH47 k 47 k oscilloscopetest tapeP-4-A100(10 kHz, 10 dB)Adjustment screw0 dB=0.775 V 11 Tape Speed AdjustmentProcedure:Mode: playback1.Set to FWD playback mode.2.Adjust RV71 so that the frequency counter reading becomes3,00090 Hz.3.Frequency difference between the beginning and the end ofthe tape should be within 3%.Adjustment Location: AUDIO board (See page 12.)Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)(WS-48B)Playback Level AdjustmentProcedure:Mode: playbackAdjust RV121 (L-CH) and RV221 (R-CH) so that the reading onlevel meter meets the adjustment limits below.Adjustment Limits:LINE OUT level: 7.70.5 dB (0.301 to 0.338 V)Level difference between channels: within 0.5 dBCheck that the LINE OUT level does not change even if Playbackand Stop operation is repeated several times.Adjustment Location: MAIN board (See page 12.)+setLINE OUTfrequency countertest tapeWS-48B(3 kHz, 0 dB)47 k +setLINE OUT47 k test tapeP-4-L300(315 Hz, 0 dB)level meterBias Consumption Current AdjustmentProcedure:1.Set RV103 (L-CH) and RV203 (R-CH) to mechanical centerand turn the set recording mode.2.Connect digital voltmeter as shown by the following table.3.Adjust the following transformers for the minimum readingson the digital voltmeter.Measurement PointAdjustment PartValueL-CH2 and 3, TP321T101minimumR-CH1 and 2, TP321T201Adjustment Location: MAIN board (See page 12.)Record Bias AdjustmentSetting:REC LEVEL control: Standard Record (See page 10.)Procedure:1.Mode: record and playback2.Adjust RV103 (L-CH) and RV203 (R-CH) so that 10 kHz play-back output is 00.3 dB relative to the 315 Hz output.Adjustment Location: MAIN board (See page 12.)+setLINE IN(no signal)B+ (+7.5 V)TP321321L-CHR-CH47 k digital voltmeterCS-413 blank tapeset47 k AF OSCAttenuatorLINE IN315 Hz10 kHz50 mV (23.8 dB)600 10 k CS-123blank tapeLINE OUTlevel meter+ 12 Record Level AdjustmentSetting:REC LEVEL control: Standard Record (See page 10.)Procedure:1.Mode: record and playback2.Adjust RV101 (L-CH) and RV201 (R-CH) so that the readingon level meter meets the adjustment limits below.Adjustment Limits: 23.80.5 dB (47.2 to 53 mV)Adjustment Location: MAIN boardRecord EQ (IV) AdjustmentSetting:REC LEVEL control: Standard Record (See page 10.)Procedure:1.Mode: record and playback2.Adjust RV102 and RV202 so that they become maximum.3.Adjust RV102 (L-CH) and RV202 (R-CH) so that the differ-ence between R-CH and L-CH at 10 kHz is within 1 dB.4.Adjust RV306 so that the R-CH meet the specification.Adjustment Limits:10 kHz level difference against 315 Hz reference.01.0 dBAdjustment Location: MAIN boardset47 k AF OSCAttenuator600 10 k CS-123blank tapeLINE OUTlevel meterLINE IN315 Hz, 50 mV (23.8 dB)+set47 k AF OSCAttenuatorLINE IN315 Hz10 kHz50 mV (23.8 dB)600 10 k CS-123blank tapeLINE OUTlevel meter+Adjustment Location:MAIN BOARD COMPONENT SIDE AUDIO BOARD COMPONENT SIDE RV71CNP73CNP71CNP72RV103RV306RV121RV202DOLBY-SBOARDJ301RV102RV201 RV101RV221RV203T101T2011 3TP301 13 14 SECTION 5DIAGRAMS5-1.NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS(In addition to this, the necessary note is each block.) Circuit Boards Location AbbreviationAUS: AustralianMY: MalaysiaSP: SingaporeHP boardAC POWER boardTRANSFORMER board (AEP, AUS)DOLBY-S boardsMAIN boardTRANS 1 board(MY, SP)TRANS 2 board(MY, SP)REC VOL boardAUDIO boardLEAF SW boardPANEL boardNote on Schematic Diagram: All capacitors are in F unless otherwise noted. pF: F50 WV or less are not indicated except for electrolyticsand tantalums. All resistors are in and 1/4 W or less unless otherwisespecified.: internal component. 2 : nonflammable resistor. 5 : fusible resistor. C : panel designation.Note on Printed Wiring Boards: X : parts extracted from the component side. Y : parts extracted from the conductor side. b : Pattern from the side which enables seeing. AbbreviationAUS: Australian model.MY: Malaysia model.SP: Singapore model. Indication of transistor. U : B+ Line. V : B Line. H : adjustment for repair. Voltages and waveforms are dc with respect to groundunder no-signal conditions.no mark : PB() : REC 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 refer to waveforms. Signal path.E: PBa: REC AbbreviationAUS: Australian model.MY: Malaysia model.SP: Singapore model.Note: The components identified by mark ! or dotted linewith mark ! are critical for safety.Replace only with part number specified.BThese are omitted.CEQBThese are omitted.CEQ 15 16 TC-KB920S5-2.PRINTED WIRING BOARDS MD Section See page 13 for Circuit Boards Location.(Page 19)(Page 19) 17 5-3.SCHEMATIC DIAGRAM MD Section TC-KB920SThe components identified by mark ! or dottedline with mark ! are critical for safety.Replace only with part number specified.(Page 24)(Page 24) 18 Waveforms MAIN BOARD (1/2) 1 T101 42 IC304 !, !4 IC304 7, 85 T301 16 IQ310 C, Q311 C3 T201 4 MAIN BOARD (2/2) 7 IC801 # (XIN)26.4 Vp-p6.4 s4.5 Vp-p6.4 s23.2 Vp-p6.4 s3.8 Vp-p6.4 s148 Vp-p6.4 s30 Vp-p6.4 s4.1 Vp-p4 MHz IC Block DiagramIC803BA6219B (MAIN BOARD)12345678910GNDMOTORDRIVENOISEFILTERCLAMPFWD.INREV.INVCC 1VCC 2NOISEFILTERMOTORDRIVEMOTORDRIVEMOTORDRIVET.S.DO.C.PFWD/REV/STOPCONTROL LOGICTC-KB920S 19 20 5-4.PRINTED WIRING BOARD MAIN Section See page 13 for Circuit Boards Location.Ref. No.LocationRef. No.Location Semiconductor LocationD101H-4D102H-4D103H-4D201H-5D202H-5D203H-4D301D-1D302F-5D305G-5D306D-5D307E-5D308D-5D309I-6D310I-6D311H-5D312F-5D313D-5D341D-1D342D-2D701G-2D702H-2D703H-2D704H-2D705G-3D706G-3D707H-3D708I-2D709G-1D710I-1D711F-3D712G-2D713G-3D714H-3D715H-3D716G-2D717G-2D802C-4D803C-4D804C-4D814E-5D815E-5IC301C-9IC302H-7IC303E-7IC304B-7IC305F-4IC306H-5IC307E-9IC308I-6IC309I-5IC310G-9IC311G-9IC701I-3IC801D-2IC803F-2IC804D-4Q101D-9Q102H-5Q103H-8Q105F-7Q201D-10Q202I-8Q203I-8Q205F-7Q301G-5Q302D-6Q303D-6Q304D-6Q305C-6Q306C-6Q307A-7Q308A-7Q309A-7Q310C-6Q311C-6Q312I-6Q313I-5Q314I-5Q315F-9Q316D-6Q351C-3Q352C-2Q353C-2Q701I-3Q702I-2Q703I-1Q704I-2Q705G-2Q706G-2Q707H-3Q708H-3Q802C-2Q803C-3Q804C-3Q806F-4Q807F-4Q808F-4Q809F-2Q810F-2Q814C-2(Page 29)(Page 27)(Page 30)(Page 25)(Page 30) (Page 25)(Page 25)(Page 25)(Page 30)(Page 30)(Page 15)(Page 16) 21 22 TC-KB920S5-5.SCHEMATIC DIAGRAM MAIN Section (1/2) See page 18 for Waveforms.(Page 26)(Page 31)(Page 26)(Page 26)(Page 26)(Page 31)(Page 23)(Page 23)The components identified by mark ! or dottedline with mark ! are critical for safety.Replace only with part number specified. 23 24 TC-KB920S5-6.SCHEMATIC DIAGRAM MAIN Section (2/2) See page 18 for Waveforms and IC Block Diagram.(Page 31)(Page 22)(Page 31)(Page 22)(Page 31)The components identified by mark ! or dottedline with mark ! are critical for safety.Replace only with part number specified.(Page 17)(Page 17)(Page 28)(Page 28) 25 26 TC-KB920S5-7.PRINTED WIRING BOARD DOLBY-S Section See page 13 for Circuit Boards Location.5-8.SCHEMATIC DIAGRAM DOLBY-S Section IC Block DiagramIC1CXA1917AM-T6 (DOLBY-S BOARD)21RECOUTSCINLANTSATMC3INMC4INHLSOUTMCBOVCCIREFSCBOLTCS2LTCS1LFBOLTCF1LTCF2L4LFIN3TCL2ZL259876TCL1SCINHTCS1HZL1HLSMPMCTC10 11 12 13VCT14VEE15242526272829302021222319171816TCS2HTCF2HFBOHTCF1HANTSATFLVCRSLVCRFHVCRLFICGLFVCRLFDETSHVCRSLDETSLICGSHICGSHDETFLDETFHDETFLICGFHICGV TO ICONV HV TO ICONV HVREF &IREFMC4MC3DSMC3DTMC2MC1