Sony-TC-KB920S-Service-Manual电路原理图.pdf

MICROFILM SERVICE MANUAL STEREO CASSETTE DECK AEP Model E Model Australian Model Model Name Using Similar MechanismTC-KE500S Tape Transport Mechanism TypeTCM-190VB14 SPECIFICATIONS TC-KB920S Dolby noise reduction and HX Pro headroom ex- tension manufactured under license from Dolby Laboratories Licensing Corporation. HX Pro origi- nated by Bang but loosen them if the tape begins to curl on the top side. (outer side.) ModeTorque MeterMeter Reading ForwardCQ-102C 30 to 65 gcm (0.42 to 0.90 ozinch) Forward backCQ-102C 1 to 6 gcm tension (0.014 to 0.08 ozinch) FF/REWCQ-201B 70 to 120 gcm (0.98 to 1.66 ozinch) 2) Declination Adjustment: While in the record/playback position, set the back tension to 0 (wind the supply reel with something thin like a pencil in a counterclockwise direction) and make sure there is no curling or shifting (shifting up/shifting down) at the guide of the record/playback head. Because shifting can only occur due to a difference in the width of the tape and that of the tape guides (curling will otherwise occur), it is necessary to pay close attention since it can be easily overlooked. When there is a shift, tighten screws B and C equally and change 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 the height and the declination. Adjustment Location: record/playback head outside Normal (Record/playback head as seen from the side of the erasehead.) Curling on the inner side Tighten screws A, B? and C. Curling on the outer side Loosen screws A, B and C. inside A BC 10 SECTION 4 ELECTRICAL ADJUSTMENTS Note: 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 otherwise specified. DOLBY NR, MPX FILTER switch: OFF MONITOR switch: Tape Standard Record: Deliver the standard input signal level to the input jack and set the REC LEVEL control to obtain the standard output signal level. Record Mode Standard Input Level input terminalLINE IN source impedance10 k input signal level0.5 V (3.8 dB) Standard Output Level output terminalLINE OUT load impedance47 k output signal level0.5 V (3.8 dB) Test Tape TypeSignalUsed for P-4-A10010 kHz, 10 dBAzimuth Adjustment P-4-L300315 Hz, 0 dBPlayback Level Adjustment WS-48B3 kHz, 0 dBTape Speed Adjustment + set 47 k LINE OUTLINE IN 600 10 k attenuator AF OSC level meter Record/Playback Head Azimuth Adjustment Procedure: 1.Mode: FWD playback 2.Turn the adjustment screw for the maximum output levels. If these levels do not match, turn the adjustment screw until both of output levels match together within 1 dB. 3.Phase Check Mode: playback 4.After the adjustment, lock the screw with locking compound. Adjustment Location: Record/Playback head + set 47 k LINE OUT level meter Test tape P-4-A100 (10 kHz, 10 dB) Screw position L-CH peak within 1dB output level L-CH peakR-CH peak within 1dB angle R-CH peak + VH + Screen pattern GoodWrong in phase 4590135180 LINE OUT set R-CH L-CH47 k 47 k oscilloscope test tape P-4-A100 (10 kHz, 10 dB) Adjustment screw 0 dB=0.775 V 11 Tape Speed Adjustment Procedure: Mode: playback 1.Set to FWD playback mode. 2.Adjust RV71 so that the frequency counter reading becomes 3,00090 Hz. 3.Frequency difference between the beginning and the end of the 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 Adjustment Procedure: Mode: playback Adjust RV121 (L-CH) and RV221 (R-CH) so that the reading on level 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 dB Check that the LINE OUT level does not change even if Playback and Stop operation is repeated several times. Adjustment Location: MAIN board (See page 12.) + set LINE OUT frequency counter test tape WS-48B (3 kHz, 0 dB) 47 k + set LINE OUT 47 k test tape P-4-L300 (315 Hz, 0 dB) level meter Bias Consumption Current Adjustment Procedure: 1.Set RV103 (L-CH) and RV203 (R-CH) to mechanical center and turn the set recording mode. 2.Connect digital voltmeter as shown by the following table. 3.Adjust the following transformers for the minimum readings on the digital voltmeter. Measurement PointAdjustment PartValue L-CH2 and 3, TP321T101 minimum R-CH1 and 2, TP321T201 Adjustment Location: MAIN board (See page 12.) Record Bias Adjustment Setting: REC LEVEL control: Standard Record (See page 10.) Procedure: 1.Mode: record and playback 2.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.) + set LINE IN (no signal) B+ (+7.5 V) TP321321 L-CH R-CH 47 k digital voltmeter CS-413 blank tape set 47 k AF OSC Attenuator LINE IN 315 Hz 10 kHz 50 mV (23.8 dB) 600 10 k CS-123 blank tape LINE OUT level meter + 12 Record Level Adjustment Setting: REC LEVEL control: Standard Record (See page 10.) Procedure: 1.Mode: record and playback 2.Adjust RV101 (L-CH) and RV201 (R-CH) so that the reading on level meter meets the adjustment limits below. Adjustment Limits: 23.80.5 dB (47.2 to 53 mV) Adjustment Location: MAIN board Record EQ (IV) Adjustment Setting: REC LEVEL control: Standard Record (See page 10.) Procedure: 1.Mode: record and playback 2.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 dB Adjustment Location: MAIN board set 47 k AF OSC Attenuator 600 10 k CS-123 blank tape LINE OUT level meter LINE IN 315 Hz, 50 mV (23.8 dB) + set 47 k AF OSC Attenuator LINE IN 315 Hz 10 kHz 50 mV (23.8 dB) 600 10 k CS-123 blank tape LINE OUT level meter + Adjustment Location: MAIN BOARD COMPONENT SIDE AUDIO BOARD COMPONENT SIDE RV71 CNP73 CNP71 CNP72 RV103 RV306 RV121 RV202 DOLBY-S BOARD J301 RV102 RV201 RV101 RV221 RV203 T101 T201 1 3 TP301 13 14 SECTION 5 DIAGRAMS 5-1.NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS (In addition to this, the necessary note is each block.) Circuit Boards Location Abbreviation AUS: Australian MY: Malaysia SP: Singapore HP board AC POWER board TRANSFORMER board (AEP, AUS) DOLBY-S boards MAIN board TRANS 1 board (MY, SP) TRANS 2 board (MY, SP) REC VOL board AUDIO board LEAF SW board PANEL board Note on Schematic Diagram: All capacitors are in F unless otherwise noted. pF: F 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in and 1/4 W or less unless otherwise specified. : 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. Abbreviation AUS: 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 ground under 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: PB a: REC Abbreviation AUS: Australian model. MY: Malaysia model. SP: Singapore model. Note: The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified. B These are omitted. CE Q B These are omitted. CE Q 15 16 TC-KB920S 5-2.PRINTED WIRING BOARDS MD Section See page 13 for Circuit Boards Location. (Page 19) (Page 19) 17 5-3.SCHEMATIC DIAGRAM MD Section TC-KB920S The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified. (Page 24) (Page 24) 18 Waveforms MAIN BOARD (1/2) 1 T101 4 2 IC304 !, ! 4 IC304 7, 8 5 T301 1 6 IQ310 C, Q311 C3 T201 4 MAIN BOARD (2/2) 7 IC801 # (XIN) 26.4 Vp-p 6.4 s 4.5 Vp-p 6.4 s 23.2 Vp-p 6.4 s 3.8 Vp-p 6.4 s 148 Vp-p 6.4 s 30 Vp-p 6.4 s 4.1 Vp-p 4 MHz IC Block Diagram IC803BA6219B (MAIN BOARD) 12345678910 GND MOTOR DRIVE NOISE FILTER CLAMP FWD.IN REV.IN VCC 1 VCC 2 NOISE FILTER MOTOR DRIVE MOTOR DRIVE MOTOR DRIVE T.S.DO.C.P FWD/REV/STOP CONTROL LOGIC TC-KB920S 19 20 5-4.PRINTED WIRING BOARD MAIN Section See page 13 for Circuit Boards Location. Ref. No.LocationRef. No.Location Semiconductor Location D101H-4 D102H-4 D103H-4 D201H-5 D202H-5 D203H-4 D301D-1 D302F-5 D305G-5 D306D-5 D307E-5 D308D-5 D309I-6 D310I-6 D311H-5 D312F-5 D313D-5 D341D-1 D342D-2 D701G-2 D702H-2 D703H-2 D704H-2 D705G-3 D706G-3 D707H-3 D708I-2 D709G-1 D710I-1 D711F-3 D712G-2 D713G-3 D714H-3 D715H-3 D716G-2 D717G-2 D802C-4 D803C-4 D804C-4 D814E-5 D815E-5 IC301C-9 IC302H-7 IC303E-7 IC304B-7 IC305F-4 IC306H-5 IC307E-9 IC308I-6 IC309I-5 IC310G-9 IC311G-9 IC701I-3 IC801D-2 IC803F-2 IC804D-4 Q101D-9 Q102H-5 Q103H-8 Q105F-7 Q201D-10 Q202I-8 Q203I-8 Q205F-7 Q301G-5 Q302D-6 Q303D-6 Q304D-6 Q305C-6 Q306C-6 Q307A-7 Q308A-7 Q309A-7 Q310C-6 Q311C-6 Q312I-6 Q313I-5 Q314I-5 Q315F-9 Q316D-6 Q351C-3 Q352C-2 Q353C-2 Q701I-3 Q702I-2 Q703I-1 Q704I-2 Q705G-2 Q706G-2 Q707H-3 Q708H-3 Q802C-2 Q803C-3 Q804C-3 Q806F-4 Q807F-4 Q808F-4 Q809F-2 Q810F-2 Q814C-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-KB920S 5-5.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 dotted line with mark ! are critical for safety. Replace only with part number specified. 23 24 TC-KB920S 5-6.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 dotted line with mark ! are critical for safety. Replace only with part number specified. (Page 17) (Page 17) (Page 28) (Page 28) 25 26 TC-KB920S 5-7.PRINTED WIRING BOARD DOLBY-S Section See page 13 for Circuit Boards Location. 5-8.SCHEMATIC DIAGRAM DOLBY-S Section IC Block Diagram IC1CXA1917AM-T6 (DOLBY-S BOARD) 21 RECOUT SCINL ANTSAT MC3IN MC4IN HLSOUT MCBO VCC IREF SCBOL TCS2L TCS1L FBOL TCF1L TCF2L 4 LFIN 3 TCL2 ZL2 59876 TCL1 SCINH TCS1H ZL1 HLSMP MCTC 10 11 12 13 VCT 14 VEE 15 242526272829302021222319171816 TCS2H TCF2H FBOH TCF1H ANTSAT FLVCRSLVCR FHVCR LFICGLFVCR LFDET SHVCR SLDETSLICG SHICGSHDET FLDET FHDET FLICG FHICG V TO I CONV H V TO I CONV H VREF & IREF MC4 MC3DS MC3DT MC2 MC1 MC4 MC3 MC1 MC (Page 19, 20) (Page 21) (Page 21) (Page 21) (Page 21) 27 28 TC-KB920S 5-9.PRINTED WIRING BOARDS POWER Section See page 13 for Circuit Boards Location. 5-10.SCHEMATIC DIAGRAM POWER Section (Page 27) (Page 27, 28) (Page 19) (Page 19) (Page 27) (Page 27) (Page 27) The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified. (Page 24) (Page 24) 29 30 TC-KB920S 5-11.PRINTED WIRING BOARDS PANEL Section See page 13 for Circuit Boards Location. (Page 19)(Page 19)(Page 20)(Page 20) (Page 19) 31 32 TC-KB920S 5-12.SCHEMATIC DIAGRAM PANEL Section (Page 24) (Page 23) (Page 23) (Page 21) (Page 22) 33 34 5-13.IC PIN FUNCTION DESCRIPTION MAIN BOARD IC801 M38172M4-171FP (SYSTEM CONTROLLER) Pin No.Pin NameI/OFunction 1T.REELITake-up reel rotation pulse input from the rotation detect sensor (IC82) 2S.REELISupply reel rotation pulse input from the rotation detect sensor (IC81) 3METER.LCHISignal input for the level meter drive (L-ch) 4METER.RCHISignal input for the level meter drive (R-ch) 5AMS.INIAuto music sensor signal input terminal “H”: AMS detect 6DOOR/STOP.SWIMechanism stop detect switch (S81) input terminal 7CLOSE.SWINot used (fixed at “H”) 8OPEN.SWINot used (fixed at “H”) 9CAM.SW3INot used (fixed at “H”) 10CAM.SW2INot used (fixed at “H”) 11CAM.SW1INot used (fixed at “H”) 12CAM.SW0INot used (fixed at “H”) 13CAP.M ON/OFFOCapstan motor (M902) on/off control signal output terminal “H”: motor on 14ASIST.M.UPOAssist motor drive signal output terminal Not used (pull down) 15ASIST.M.DOWNOAssist motor drive signal output terminal Not used (pull down) 16REEL.M.FWDOReel motor (M901) drive signal output to the BA6219B (IC803) 17REEL.M.REVOReel motor (M901) drive signal output to the BA6219B (IC803) 18EJECT.V (6.5V)OReel motor (M901) eject control signal output terminal “H” active 19FF/REW.V (4.4V)OReel motor (M901) FF/REW control signal output terminal “H” active 20PLAY.V (2.5V)OReel motor (M901) play control signal output terminal “H” active 21TYPE.IVIMetal detect switch (S83) input terminal “H”: metal 22HALF.SWIHalf detect switch input terminal Not used (fixed at “H”) 23TYPE.IIICrO2 detect switch (S82) input terminal “H”: CrO2 24TAB.SWINot used (fixed at “H”) 25POWER.INIAC in detect signal input terminal “H”: AC in 26SIRCS.INISircs signal input from the remote control receiver (IC901) 27RESETI System reset signal input from the reset signal generator (IC804) “L”: reset “L” is input for several 100 msec after power on, then it changes to “H” 28XCINISub system clock input terminal Not used (fixed at “L”) 29XCOUTOSub system clock output terminal Not used (open) 30XINIMain system clock input terminal (4 MHz) 31XOUTOMain system clock output terminal (4 MHz) 32VSSGround terminal 33VER.200/190ISetting terminal for the version (fixed at “L”) 34POWER.OUTOPower on/off control signal output terminal “L”: power on Not used (open) 35 MONITOR.TAPE/ SOURCE OAudio monitor selection signal output terminal “H”: tape monitor, “L”: source monitor 37OSC H/LOCalibration tone frequency high/low control signal output terminal “L”: frequency low 38CAL.ON/OFFOCalibration tone on/off control signal output terminal “H”: on, “L”: off 39REC.M.ON/OFFO Record muting on/off control signal output to the CXA1598S (IC303) “L”: record muting on 40BIAS.ON/OFFORecording bias on/off control signal output terminal “H”: bias on 41DOL.CONO Dolby B/C type or dolby on/off selection signal output to the CXA1563S (IC302, 307) “H”: dolby C type, “L”: dolby off (center voltage: dolby B type) 42SEG.IVO Metal on/off control signal output or segment drive signal output to the fluorescent indicator tube (VFD901) (for TYPE IV light up) Pin No.Pin NameI/OFunc