索尼SONY WM-EX170电路图.pdf

WM-EX170/EX172 Canadian Model WM-EX170 AEP Model E Model WM-EX170/172 SERVICE MANUAL CASSETTE PLAYER MICROFILM SPECIFICATIONS Model Name Using Similar MechanismNEW Tape Transport Mechanism TypeMT-WMEX170-114 Manufactured under license from Dolby Laboratories Licensing Corporation. “DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation. Power requirements 3V DC batteries R6 (AA) 2 / External DC 3V power sources Dimensions 88.5 111.5 37.6 mm (3 1/2 4 1/2 1 1/2 inches) (w / h/ d) incl. projecting parts and controls Mass EX170 : Approx. 125 g (4.5 oz) / Approx. 185 g (6.6 oz) incl. batteries and a cassette EX172 : Approx. 130 g (4.6 oz) / Approx. 190g (6.8 oz) incl. batteries and a cassette Supplied accessories Stereo headphones or Stereo earphones (1) / Belt clip (1) Design and specifications are subject to change without notice. Photo : WM-EX172 ? ? ? ? ? ? ? ? ? ? 2 TABLE OF CONTENTS Flexible Circuit Board Repairing Keep the temperature of the soldering iron aroud 270 C during 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. Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be damaged by heat. SECTION 1 GENERAL 1.GENERAL2 2.DISASSEMBLY 2-1.Cabinet (Front) Assy 3 2-2.Main Board4 2-3.Cassette Lid 4 2-4.Mechanism Deck 5 2-5.Belt, Motor (Reel/Capstan) 5 3.MECHANICAL ADJUSTMENT6 4.ELECTRICAL ADJUSTMENT6 5.DIAGRAMS 5-1.Block Diagram 7 5-2.Printed Wiring Board (EX170 Model) 9 5-3.Schematic Diagram (EX170 Model) 11 5-4.Printed Wiring Board (EX172 Model) 13 5-5.Schematic Diagram (EX172 Model) 15 5-6.IC Block Diagrams 17 6.EXPLODED VIEWS 6-1.Cabinet Section18 6-2.Main Board Section 19 6-3.Mechanism Section-1 (MT-WMEX170-114) 20 6-4.Mechanism Section-2 (MT-WMEX170-114) 21 7.ELECTRICAL PARTS LIST22 This section is extracted from instruction manual. EX172 MODEL ? ? ? ? ? ? ? ? ? ? 3 Cassette, lid Cabinet (front) assy A 1 Two screws Screw (B1.7 9), tapping SECTION 2 DISASSEMBLY Note :Follow the disassembly procedure in the numerical order given. 2-1. CABINET (FRONT) ASSY 2 Insert the precision screwdriver (1.4 mm flat-blade) into the slit at claw A and release the claw. 3 Remove the cabinet (front) assy. (Release all claws B to L in alphabetical order.) This set can be disassembled in the order shown below. 2-1. CABINET (FRONT) ASSY2-2. MAIN BOARD 2-3. CASSETTE LID 2-4. MECHANISM DECK2-5. BELT, MOTOR (REEL/CAPSTAN) B L K C D E F G H I J ? ? ? ? ? ? ? ? ? ? 4 5 Spring (torsion) B A 1 Open the cassette lid. 4 Cassette lid. 2-2. MAIN BOARD 2-3. CASSETTE LID 2 Insert a precision screwdriver (1.4 mm flat-blade) vertically into portion A to release the hinge plate. 3 Portion B to release the hinge plate. 1 Head flexible board (CN301) 5 Two claws 6 MAIN board 3 Remove the four solders. 4 Screw (M1.4), toothed lock (WH) 2 Flexible board (CN302) ? ? ? ? ? ? ? ? ? ? 5 2 Two screw screw (M1.4), special head 3 Motor (reel/capstan) 1 Belt 2-4. MECHANISM DECK 2-5. BELT, MOTOR (REEL/CAPSTAN) 1 Insert the precision screwdriver (1.4 mm flat-blabe) in to the slit and release two claws. 2 Remove the mechanism deck in the direction of the arrow. ? ? ? ? ? ? ? ? ? ? 6 SECTION 3 MECHANICAL ADJUSTMENT SECTION 4 ELECTRICAL ADJUSTMENT PRECAUTION 1.Clean the following parts with a denatured-alcahol-moistened sweb : 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 adjusted parts. 5.Unless specified otherwise, use a specified voltage (3.0V) to perform the adjustments. Torqu Measurement Mode FWD FWD Back Tension REV REV Back Tension FF REW Torqu meter CQ-102C CQ-102RC CQ-201B Meter reading 20 - 30 g cm 0.4 - 2.0 g cm 20 - 30 g cm 0.4 - 2.0 g cm More than 40 g cm PRECAUTION 1.Specified voltage : 3.0V 2.Switch position DOLBY NR switch: OFF (EX172 MODEL) AVLS switch: NORM CASSETTE SECTION Test Tape Tape Speed Adjustmnet Procedure : 1.Playback WS-48A (Tape center part) and adjust RV601 so that the frequency counter reading becomes 3,000Hz 15Hz. 2.Playback WS-48A (Tape top and end). Check that frequency counter reading is within 1.5% of the reading of step1. Adjustment Point : MAIN BOARD CONDUCTOR SIDE Type WS-48A Signal 3kHz, 0dB Purpose Tape Speed Adjustment Test tape WS-48A (3kHz, 0dB) Set 16 PHONES jack + Frequency counter RV601: Tape speed ? ? ? ? ? ? ? ? ? ? WM-EX170/EX172 SECTION 5 DIAGRAMS 5-1. BLOCK DIAGRAM 7 8 IC301 28 L R 29 32 35 RV301 VOLUME HP901 PLAYBACK HEAD M901 REEL/CAPSTAN MOTOR 34 2418 15 23 4 11 13 5 10 19 36 1 8 4 LIMIT NORMAL PRE + POWER AMP IC331 DOLBY NR IC601 MOTOR DRIVE MAIN BOARD J302 J301 DC IN 3V PHONES S305 AVLS D150 BATT S302 (POWER) 17 15 14 4U W IN+ 13S/S V VREF 5 6 21 22 3 7 RV601 TAPE SPEED S303 NORM VREF PRE OUT2 L MIX IN 2L MIX OUT L MIX OUT R PWR IN2 L PWR IN1 R HP IN 2L MIX IN 1R HP IN 1R PRE OUT1 R VREF 25 6 RV351 HIGH RV352 LOW S351 MEGA BASS OFF ON 14 VREFVREF S352 DOLBY NR ON OFF S351 MEGA BASS OFF ON VREF M.B ON/OFF LOW BOOST GAIN COM VCC AVLS PWR OUT 1(R) PWR OUT 2(L) MEGA BASS UNITMEGA BASS UNIT EX170 MODELEX172 MODEL 26 (TAPE SELECTOR) CrO2/METAL EX172 MODEL EX170 MODEL EX170 MODEL EX170 MODEL IN L IN R OUT L OUT R20 DRY BATTERY SIZE AA (IEC DESIGNATION R6) 2PCS, 3V ON/OFF Signal path. E: PB ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? WM-EX170/EX172 12 A B C D E F G H 3456789101112 9 10 5-2. PRINTED WIRING BOARD (EX170 MODEL) Ref. No.Location D150H-3 IC301E-7 IC601E-10 Semiconductor Location Note on Printed Wiring Board: X : parts extracted from the component side. b : Pattern from the side which enables seeing. (The other layers patterns are not indicated.) Abbreviation CND: Canadian. EE: East European. FR: French. 9E: Country of origin is not shown. 16 MEGA BASS UNIT OFF ON 4 6 2 DC IN 3V BLK ORG RED WHT BLK ORG RED WHT M901 REEL/CAPSTAN MOTOR DRY BATTERY SIZE AA (IEC DESIGNATION R6) 2PCS, 3V MAIN BOARD AVLS NORM LIMIT J302 NORM CrO2/ METAL BATT RV301 VOLUME S302 (POWER) L R 4 5 3 2 16 PLAY BACK HEAD HP901 1-667-710- 11 (11) 1 5 9 10 19 1815 27 2836 30 25 L R 16 E,9E MODEL EXCEPT E,9E ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? WM-EX170/EX172 5-3. SCHEMATIC DIAGRAM (EX170 MODEL) 11 12 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. %: indicates tolerance. C : panel designation. U : B+ Line. H : adjustment for repair. Total current is measured with no cassette installed. Power voltage is dc V and fed with regulated dc power supply from external power voltage jack. Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : PLAY Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal produc- tion tolerances. Signal path. E: PB Abbreviation CND: Canadian. EE: East European. FR: French. 9E: Country of origin is not shown. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? WM-EX170/EX172 12 A B C D E F G H 3456789101112 13 14 Ref. No.Location D150H-3 IC301F-7 IC331F-4 IC601E-10 Semiconductor Location 5-4. PRINTED WIRING BOARD (EX172 MODEL) BLK ORG RED WHT DC IN 3V BLK ORG RED WHT M901 REEL/CAPSTAN MOTOR DRY BATTERY SIZE AA (IEC DESIGNATION R6) 2PCS, 3V MAIN BOARD AVLS NORM LIMIT J302 BATT RV301 VOLUME L R NORM CrO2/ METAL S302 (POWER) L R 4 5 3 2 1 1 6 1-667-711- 11 16 (11) 195 MEGA BASS UNIT RV352 LOW RV351 HIGH OFF ON ON OFF 7 6 8 5 4 3 9 1 2 S351 MEGA BASS S352 DOLBY NR PLAY BACK HEAD HP901 5 9 10 19 1815 27 2836 30 25 E,6E,9E MODEL EXCEPT E,6E,9E Note on Printed Wiring Board: X : parts extracted from the component side. b : Pattern from the side which enables seeing. (The other layers patterns are not indicated.) Abbreviation CND: Canadian. EE: East European. FR: French. 6E: Central and South America. 9E: Country of origin is not shown. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? WM-EX170/EX172 15 16 5-5. SCHEMATIC DIAGRAM (EX172 MODEL) 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. %: indicates tolerance. C : panel designation. U : B+ Line. H : adjustment for repair. Total current is measured with no cassette installed. Power voltage is dc V and fed with regulated dc power supply from external power voltage jack. Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : PLAY Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal produc- tion tolerances. Signal path. E: PB Abbreviation EE: East European model. FR: French model 6E: Central and South America. 9E: Country of origin is not shown. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 17 5-6. IC BLOCK DIAGRAMS GNDIREF 2 VREF 3 INB 4 OUTB 567 DCBDETB 1 V+SW 13 VEXT 12 INAOUTA 8 DCADETA BIAS Circuit Bch BLOCK Ach BLOCK Gm SUM (same Ach) + Weight + G1G2V/I 9101114 IC331 NJM2185V IC601 LB1979V 20191817161514131211 12345678910 CURRENT DETECT OUTPUT PRE DRIVER MIX WAVEFORM DETECT CURRENT/MOTIVE LOGIC SOFT SW REFERENCE VOLTAGE FOR SPEED CONTROL MOTIVE POWER DETECT POWER SUPPLY BIAS REFERENCE VOLTAGE OSCILLATOR CIRCUIT SPEED DETECT FC GND FC RI OUT VSP IN+ VREF S/S COM OSC WB VCC NC U OUT V OUT W OUT P-GND VB UB GND ? ? ? ? ? ? ? ? ? ? 18 NOTE: -XX, -X mean standardized parts, so they may have some differences from the original one. Items marked “*” are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. SECTION 6 EXPLODED VIEWS 6-1. CABINET SECTION The mechanical parts with no reference number in the exploded views are not supplied. Abbreviation CND: Canadian. EE: East European. FR: French. Ref. No.Part No.DescriptionRemarksRef. No.Part No.DescriptionRemarks 13-019-852-01CABINET (REAR)(BLACK)(SILVER) (EX170:CND,AEP,FR,EE/EX172:AEP,EE,FR) 13-019-852-11CABINET (REAR)(BLUE)(EX172:AEP,FR) 13-019-852-21CABINET (REAR)(GREEN)(EX172:AEP,FR) 13-019-852-31CABINET (REAR)(RED)(EX172:AEP,FR) 13-019-852-51CABINET (REAR)(BLACK)(SILVER) (EX170:E,9E/EX172:E,6E,9E) 13-019-852-61CABINET (REAR)(BLUE)(EX172:E,9E) 13-019-852-71CABINET (REAR)(GREEN)(EX172:E,9E) 13-019-852-81CABINET (REAR)(RED)(EX172:E,9E) 23-019-940-01LID, BATTERY CASE(BLACK)(SILVER) 23-019-940-11LID, BATTERY CASE(BLUE) (EX172:AEP,FR,E,9E) 23-019-940-21LID, BATTERY CASE(GREEN) (EX172:AEP,FR,E,9E) 23-019-940-31LID, BATTERY CASE(RED) (EX172:AEP,FR,E,9E) 33-019-850-01CABINET (FRONT)(BLACK)(SILVER) (EX170:CND,AEP,FR,EE/EX172:AEP,EE,FR) 33-019-850-11CABINET (FRONT)(BLUE)(EX172:AEP,FR) 33-019-850-21CABINET (FRONT)(GREEN)(EX172:AEP,FR) 33-019-850-31CABINET (FRONT)(RED)(EX172:AEP,FR) 33-019-850-51CABINET (FRONT)(BLACK)(SILVER) (EX170:E,9E/EX172:E,6E,9E) 33-019-850-61CABINET (FRONT)(BLUE)(EX172:E,9E) 33-019-850-71CABINET (FRONT)(GREEN)(EX172:E,9E) 33-019-850-81CABINET (FRONT)(RED)(EX172:E,9E) 43-019-939-01SPRING (CASSETTE HOLDER) 53-019-949-01SPRING (TORSION) 63-019-847-01HOLDER, CASSETTE(BLACK)(EX170) 63-019-847-11HOLDER, CASSETTE(BLUE) (EX170:CND,AEP,EE,E,9E) 7 9 8 15 16 6 5 4 10 11 12 3 MT-WMEX170-114 2 1 13 14 63-019-847-21HOLDER, CASSETTE(GREEN) (EX170:CND,AEP,EE,E,9E) 63-019-847-31HOLDER, CASSETTE(RED) (EX170:CND,AEP,EE,E,9E) 63-019-847-41HOLDER, CASSETTE(SILVER) (EX170:CND,AEP,EE,E,9E) 63-019-848-01HOLDER, CASSETTE(BLACK)(EX172) 63-019-848-11HOLDER, CASSETTE(BLUE) (EX172:AEP,FR,E,9E) 63-019-848-21HOLDER, CASSETTE(GREEN) (EX172:AEP,FR,E,9E) 63-019-848-31HOLDER, CASSETTE(RED) (EX172:AEP,FR,E,9E) 63-019-848-41HOLDER, CASSETTE(SILVER) (EX172:AEP,FR,E,9E) 73-019-947-01BUTTON (ROTARY)(BLACK)(EX172) 73-019-947-11BUTTON (ROTARY)(EXCEPT BLACK)(EX172) 83-019-945-01BUTTON (MEGA BASS)(EX172) 83-019-853-01KNOB (MEGA BASS)(EX170) 93-019-946-01BUTTON (DOLBY)(EX172) 103-019-863-01ACTUATOR (A)(EX170) 103-022-655-01ACTUATOR (B)(EX172) 113-022-656-01ACTUATOR (C)(EX172) 121-475-439-11MEGA BASS UNIT (SWITCH) (EX170) 121-475-441-11MEGA BASS UNIT (DOLBY) (EX172) 133-022-346-01LENS 143-318-203-92SCREW (B1.7X9), TAPPING 153-025-244-01COVER(EX170) 153-025-245-01COVER(EX172) 163-025-246-01COVER(EX172) 6E: Central and South America. 9E: Country of origin is not shown. Color Indication of Appearance Parts Example: KNOB, BALANCE (WHITE) . . . (RED) Parts of Color Cabinets Color ? ? ? ? ? ? ? ? ? ? 19 6-2. MAIN BOARD SECTION 513-015-285-01SCREW (M1.4),TOOTHED LOCK (WH) 52A-3021-030-A MAIN BOARD, COMPLETE(EX170:E,9E) 52A-3021-008-A MAIN BOARD, COMPLETE(EX170:CND,AEP,EE) 52A-3021-040-A MAIN BOARD, COMPLETE(EX172:E,6E