sony_wm-sr1.pdf
MICROFILM SERVICE MANUAL RADIO CASSETTE-CORDER US Model Canadian Model E Model Chinese Model Model Name Using Similar MechanismWM-FX171 Tape Transport Mechanism TypeMF-WMSR1-114 SPECIFICATIONS WM-SR1 Ver 1.0 1999. 01 2 TABLE OF CONTENTS 1.SERVICING NOTES.2 2.GENERAL.4 3.DISASSEMBLY.5 4.MECHANICAL ADJUSTMENTS.9 5.ELECTRICAL ADJUSTMENTS Tape Deck Section .9 Tuner Section . 10 6.DIAGRAMS 6-1.Block Diagram TUNER Section . 11 6-2.Block Diagram MAIN Section . 13 6-3.Printed Wiring Board . 18 6-4.Schematic Diagram . 21 7.EXPLODED VIEWS. 27 8.ELECTRICAL PARTS LIST. 29 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 NOTES In this set, the S301 (TAPE POWER switch) detects REC/PLAY- BACK on. It is mounted on the MAIN board, and therefore the REC/PLAY- BACK on cannot be detected with the MAIN board removed. When making an operation check and voltage check of mechani- cal deck with the MAIN board removed, fix the S301 at turn on. S301 MAIN BOARD (Component Side) 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 the circuit board (within 3 times). Be careful not to apply force on the conductor when soldering or unsoldering. 3 MODEL IDENTIFICATIONFM MODE or FM SENS S2 MADE IN MALAYSIA or no indication Rear View CF1 X1 mark MarkCenter frequency red10.70 MHz blue10.67 MHz orange10.73 MHz black10.64 MHz white10.76 MHz HOW TO CHANGED THE CERAMIC FILTERS This model is used two ceramic filters of CF1 and X1. You must used same type of color marked ceramic filters in order to meet same specifications. Therefore, the ceramic filter must changed two pieces together since its supply two pieces in one package as a spare parts. ModelIndication of S2Indication of country originIndication of service manual USFM SENSMADE IN MALAYSIAUS CanadianFM SENSMADE IN MALAYSIACND or Canadian EFM MODEMADE IN MALAYSIAE Saudi ArabiaFM MODEMADE IN MALAYSIAEA or Saudi Arabia 5EFM SENSMADE IN MALAYSIA5E 9EFM MODENo indication9E ChineseFM MODEMADE IN MALAYSIACH or Chinese 4 SECTION 2 GENERAL This section is extracted from instruction manual. LOCATION OF PARTS AND CONTROLS *1 FM MODE: E, Saudi Arabia, 9E, Chinese Models FM SENS:US, Canadian, 5E Models 5 CABINET (REAR) ASSY NOTE FOR INSTALLATION Note: Follow the assembly procedure in the numerical order given. CABINET (REAR) ASSY Note: Follow the disassembly procedure in the numerical order given. SECTION 3 DISASSEMBLY This set can be disassembled in the order shown below. Cabinet (Rear) Assy Main Board Dial Pointer Setting Mechanism Deck (MF-WMSR1-114) “Holder Sub Assy, Cassette” Belt, Motor (M901), “Head, Magnetic” (HRP901) Set On installation cabinet (rear) assy adjust the S2, S305, S307, S308, S310 and knob (AVLS), knob (PAUSE STOP). 1two screws (B1.7 9) L K J IB C D E F G H cabinet (rear) assy 3Remove the cabinet (rear) assy (Release all claws from B to L in alphabetical order.) A 2?Insert the precision screw driver (1.4 mm flat-blade) into the slit at claw A and release the claw. Note: Apply cloth or spacer at the tip of the driver not to break the claw. 2 2 2 2 2 1 1 1 1 1 S310 S308 S2 S305 S307 3cabinet (rear) assy knob (AVLS) knob (PAUSE STOP) knob (AVLS) 6 MAIN BOARD DIAL POINTER SETTING Note: Follow the assembly procedure in the numerical order given. 3connector (CN302) 4screw (M1.4) 1Remove four solders of motor (M901). 5two claws 2flexible board (CN301) 6main board 1Turn the tuning knob fully in the arrow direction. 2Mount the pointer as shown in the figure A. pointer guide rib fig. A 7 MECHANISM DECK (MF-WMSR1-114) BELT, MOTOR (M901), “HEAD, MAGNETIC” (HRP901) 2?Remove the mechanism deck (MF-WMSR1-114) to direction of the arrow A. 1?two claws A 1belt 3motor (M901) 2two special head screws (M1.4) 4two special head screws (M1.4) 5“head, magnetic” (HRP901) 8 “HOLDER SUB ASSY, CASSETTE” NOTE FOR INSTALLATION Note: Follow the assembly procedure in the numerical order given. “HOLDER SUB ASSY, CASSETTE” 2Portion B to release the hinge plate. 4spring (torsion) B 3“holder sub assy, cassette” A 1Insert a precision screw driver (1.4 mm flat-blade) vertically into portion A to release the hingeplate. 3?“holder sub assy, cassette” 1Attach the spring (torsion) as shown in the figure. 2Insert the spring (torsion) in the ditch to direction of the arrow A. A ModeTorque meterMeter reading FWD 20 30 gcm (0.28 0.41 ozinch) FWD CQ-102C 0.4 2.0 gcm Back Tension(0.006 0.02 ozinch) REV 20 30 gcm (0.28 0.41 ozinch) REV CQ-102RC 0.4 2.0 gcm Back Tension(0.006 0.02 ozinch) FF CQ201B More then 40 gcm REW (more than 0.6 ozinch) 9 10 SECTION 4 MECHANICAL ADJUSTMENT PRECAUTION 1.Clean the following parts with a denatured-alcahol-moistened swab : Playback headPinch roller Rubber beltCapstan 2.Demagnetize the playback head using a demagnetizer. 3.Do not use a magnetized screwdriver for adjustments. 4.After adjusting, apply screw-locking compound onto the ad- justed parts. 5.Unless specified otherwise, use a specified voltage (3.0 V) to perform the adjustments. Torqu Measurement SECTION 5 ELECTRICAL ADJUSTMENTS Tape Speed Adjustment Setting: function switch: TAPE Procedure: 1.Playback WS-48A (tape center) in the FWD state. 2.Adjust RV601 so that the frequency counter reading becomes 3,000 Hz. Specification Values: 3.Check that deflection of the frequency counter reading between the beginning and the end of tape is within 1.5% (apporox. 45 Hz). Adjustment Location: PRECAUTION 1.Specified voltage: 2.5 V (DC) 2.Setting VOLUME dial: maximum SPEAKER switch: OFF AVLS switch: NORM MEGA BASS switch : OFF PB EQ switch: NORM PAUSE switch: off ISS: 1 FM SENS switch: DX (US, CND, 5E) FM MODE switch: ST (E, 9E, EA, CH) 3.Abbreviation CH: Chinese CND : Canadian EA: Saudi Arabia 5E: Refer to “Model Identification” on page 3. 9E: Refer to “Model Identification” on page 3. TAPE DECK SECTION 0 dB=0.775 V Test tape TypeSignalUsed for WS-48A3 kHz, 0 dBTape Speed Adjustment Frequency counter 2,985 Hz to 3,015 Hz TUNER SECTION0 dB=1 V FM Setting: function switch : FM AM Setting: function switch : AM Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors. Adjustment Location: FM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter US, CND, 5EE, 9E, CHEA L386 MHz86 MHz87.35 MHz CT1-3109.5 MHz109.5 MHz108.25 MHz FM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter US, CND, 5EE, 9E, CHEA L286 MHz86 MHz87.35 MHz CT1-2109.5 MHz109.5 MHz108.25 MHz AM IF ADJUSTMENT Adjust for a maximum reading on level meter T1455 kHz AM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter US, CND, 5EE, 9E, CHEA L4515 kHz515 kHz516.5 kHz CT1-41,750 kHz1,680 kHz1,631.5 kHz AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L1620 kHz CT1-11,400 kHz Put the lead-wire antenna close to the set. AM RF SSG 30% amplitude modulation by 400 Hz signal output level: as low as possible FM RF SSG 0.01 F MAIN board TP340 (FM IN) 22.5 kHz frequency deviation by 400 Hz signal. output level: as low as possible + set Test tape WS-48A (3 kHz, 0 dB) frequency counter 16 2 (phones jack) (J301) + set 16 level meter 2 (phones jack) (J301) Abbreviation CH: Chinese CND : Canadian EA: Saudi Arabia 5E: Refer to “Model Identification” on page 3. 9E: Refer to “Model Identification” on page 3. MAIN BOARD (Component Side) MAIN BOARD (Conductor Side) J302 L1 L2 L3 L4 T1 AM IF Adjustment AM Tracking Adjustment FM Tracking Adjustment AM Frequency Coverage Adjustment FM Frequency Coverage Adjustment CT1-4 CT1-3 CT1-1 CT1-2 TP340 (FM IN) J302 RV601 Tape Speed Adjustment RV601 11 12 WM-SR1 6-1.BLOCK DIAGRAM TUNER Section SECTION 6 DIAGRAMS 1 48 24 2123 FM RF AMPFM/AM MIX AMP FM/AM OSC FM IF AMP DECODER AMP SWITCH DIVIDER/ VCO FM DET LEVEL DET AM DET FM MUTE AF BUFFER AM IF AMP PD1 PD2 AM RF AMP LOCAL/DX SWITCHING Q70 7 FM RF IN FM/AM MIX OUT CF1 10.7MHz X1 10.7MHz CF2 455kHz 12 FM IF IN 14 13 L-OUT R-OUT 151610 AM IF IN LPF2 AM/XFM LPF1 M/XST TUN LED FM OSC 20 AM OSC L1 AM FERRITE-ROD ANTENNA FM RF OUT AM RF IN L2 FM RF FM/AM RF AMP, FM/AM MIX AMP, FM/AM OSC, FM/AM IF AMP, DET, MPX IC1 CT1-2CV1-2 CV1 TUNING CT1-1CV1-1 L3 FM OSC CT1-3CV1-3 L4 AM OSC CT1-4CV1-4 CT1-3, L3 FM FREQUENCY COVERAGE CT1-4, L4 AM FREQUENCY COVERAGE CT1-1, L1 AM TRACKING CT1-2, L2 FM TRACKING T1 AM IF B.P.F. FL1 FM/AM BAND SELECT SWITCH Q33, 34 FM B+ D33 D70 ANT A TUNER MUTE C (Page 13) TUNER L/R B (Page 13) (Page 14) SIGNAL PATH : FM : AM 05 11 ST LED AGC TUN LED ST LED MUTING CONTROL SWITCH Q30 32 AM B+ FM B+ DET OUT AF AMPMPX IN EXCEPT US, Canadian, 5E models US, Canadian, 5E models QUAD 1817 EXCEPT US, Canadian, 5E models EXCEPT US, Canadian, 5E models US, Canadian, 5E models US, Canadian, 5E models S2 FM MODE MONO ST S2 FM SENS LOCAL DX WM-SR1 13 14 15 16 6-2.BLOCK DIAGRAM MAIN Section + MIC AMP, ALC IC341 (1/2) REC/PB AMP IC341 (2/2) TAPE EQ AMP, MEGA BASS/AVLS CONTROL, HEADPHONE AMP IC301 POWER AMP IC401 05 ANT A TUNER MUTE C (Page 12) TUNER L/R TUNER LTUNER R B (Page 12) (Page 11) S301 (TAPE POWER) (ON at FF/REW/PLAY modes.) BATT B+ REC B+ VCC B+ TUNER VCC MIC B+ S1 (1/2) (FUNCTION) FM B+ TUNER B+ D503 D502 AM B+ TAPE B+ SP1 (SPEAKER) SP2 (TWEETER) VCC VCC B+ VCC B+ BATT B+ REC B+ MIC B+ D309 TAPE B+ REC B+ TAPE B+ BATT B+ SWITCHING Q608 D301 D302 D405 D406 REC/PB MUTE START/STOP MUTE TUNER MUTE D101 D102 D402 D404 D403 HP MUTE VCC B+ REC B+ SPEAKER/ HEADPHONE SWITCHING Q308 POWER MUTE SWITCH Q305 VCC B+ 2 1 MIX OUT 1 MIX OUT 2 POWER IN 1 POWER IN 2 POWER OUT 1 POWER OUT 2 POWER OUT C VREF L R LOW BOOST IN 1 LOW BOOST IN 2 MUTE PRE OUT L L-CH HE901 (ERASE) FWD L REV L HRP901 (REC/PB) D305 D306 TUNER B+ REC B+ TUNER VCC REC B+ BUF IN B PB OUT B REC OUT B BUF IN A MIC IN B MIC OUT B MIC IN A DET 2 OUT PRE NF 2 PRE OUT 2 PRE NF 1 PRE OUT 1 6 5 3 + 8 7 1 2 2 PWR MUTE 9 TUNER B+ PRE MUTE 10 26252122 6 DET 2 IN 3 8 4 35 34 36 1 20 18 24 31 28 15 8 2 14 13 1621 19 + + + + ALC MIC AMP PB AMP REC AMP MIC OUT A 17ALC MIC AMP RIPPLE FILTER Q301, 302 B+ SWITCH Q341, 343 TUNER ON SWITCH Q303 TAPE ON SWITCH Q304 B+ SWITCH Q333, 334 REC MUTE SWITCH Q359 PB MUTE SWITCH Q360 MIX AMP Q231 B+ SWITCH Q609 START/STOP CONTROL SWITCH Q610 START MUTE SWITCH Q606 REC BIAS OSC Q351 PRE MUTE SWITCH Q310 MUTING CONTROL SWITCH Q311 SPEAKER/HEADPHONE SWITCHING Q356, 357 TAPE EQ SWITCH Q101, 201 NF DET DET CONTROL M.B. ON/OFF 14 LOW BOOST J303 MIC RV301 VOLUME MUTING Q141 MUTING Q241 PB OUT A REC OUT A 9 3 EQ AMP POWER AMP POWER AMP POWER AMP MODE CONTROL CIRCUIT PB AMP REC AMP RADIO/TAPE 11 12 PWSW REC/PB R-CH S303 (1/4) S303 (2/4) RECPB S303 (REC/PB) RECPB S303 (4/4) (REC/PB) OFFON S309 RECPB S303 (4/4) (REC/PB)NORMLIMIT CrO2/METAL NORM PB EQ S310 VREF OFF ON MEGA BASS S306 AVLS S305 OFFON PAUSE S308 MUTE PRE OUT R FWD R REV R VREFVREF 23 30 29 32 EQ AMP + + + VREF VREF MIX 2 MIX 1 SP/HP T351 BIAS OSC S307 ISS 3 2 1 + J301 (HEADPHONE) 2 D401 D407 + + SPEED CONTROL MOTOR CONTROL SWITCH Q603, 604 MOTOR BRAKE SWITCH Q601 CAPSTAN/REEL MOTOR DRIVE IC601 M901 (CAPSTAN/REEL) MOTOR DRIVE CIRCUIT SWITCH & LOGIC CIRCUIT BIAS REFERENCE VOLTAGE OSC CIRCUIT STOP MUTE SWITCH Q607 TH601 TAPE SPEED RV601 S/S VREF IN+ COMPARATOR VSP OUT OSC 13 14 11 15 16 17 WOUT 6 VOUT 5 UOUT WV U 4 SPEAKER DRY BATTERY SIZE AA (IEC DESIGNATION R6) 2PCS. 3V FM AM TAPE (RADIO OFF) S1 (2/2) (FUNCTION) FM AM TAPE (RADIO OFF) D308 BATT J302 DC IN 3V + SIGNAL PATH : TUNER (FM/AM) : TAPE PLAY : TAPE REC : MIC INPUT WM-SR1 18 19 20 6-3.PRINTED WIRING BOARD Semiconductor Location (Conductor Side) Ref. No.Location D70B-2 D308H-6 D502F-6 D503F-6 IC1C-5 IC301F-4 IC341D-6 IC401G-2 IC601H-5 Q70B-2 Q101G-5 Q201F-5 Q301G-4 Q302G-4 Q303H-4 Q304G-4 Q333H-2 Q351I-4 Semiconductor Location (Component Side) Ref. No.Location D33E-2 D101H-6 D102H-6 D301G-2 D302G-2 D305E-5 D306E-5 D309G-5 D401F-3 D402F-2 D403G-2 D404G-2 D405G-3 D406F-3 D407G-2 Q30G-5 Q31F-2 Q32G-2 Q33E-2 Q34E-2 Q141B-5 Q231E-3 Q241B-5 Q305E-5 Q308G-5 Q310F-5 Q311G-4 Q334F-2 Q341D-6 Q343D-5 Q356E-4 Q357F-4 Q359H-4 Q360H-4 Q601H-5 Q603H-5 Q604H-5 Q606H-6 Q607H-5 Q608G-5 Q609G-6 Q610G-6 Note on Printed Wiring Board: X : parts extracted from the component side. Y : parts extracted from the conductor side. : Through hole. : internal component. b : Pattern from the side which enables seeing. (The other layers patterns are not indicated.) Caution: Pattern face side:Parts on the pattern face side seen from (Conductor Side)the pattern face are indicated. Parts face side:Parts on the parts face side seen from (Component Side)the parts face are indicated. Abbreviation CH: Chinese model. CND: Canadian model. EA: Saudi Arabia model. 5E: Refer to “Model Identification” on page 3. 9E: Refer to “Model Identification” on page 3. WM-SR1 WM-SR1 21 22 23 24 6-4.SCHEMATIC DIAGRAM See page 25 for IC Block Diagrams. 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. C : panel designation. U : B+ Line. H : adjustment for repair. Power voltage is dc 3 V and fed with regulated dc power supply from battery terminal. Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : FM () : AM : TAPE PLAY : TAPE 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. F: FM f: AM E: TAPE PLAY d: TAPE REC N: MIC INPUT Abbreviation CH: Chinese model. CND: Canadian model. EA: Saudi Arabia model. 5E: Refer to “Model Identification” on page 3. 9E: Refer to “Model Identification” on page 3. Waveforms 1 T351 (REC mode) 50 V/DIV, 10 s/DIV 2 IC601 ! OSC (REC mode) 10 mV/DIV, 500 s/DIV 80 Vp-p 20 s 42 mVp-p 1.5 ms 25 26 27 28 IC Block Diagrams MAIN Board IC1TA2111F- (EL) IC301LA4585M-TLM IC601LB1979V-TLM (1)CABINET SECTION SECTION 7 EXPLODED VIEWS Items ma
