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1、WM-EX20 US Model Canadian Model AEP Model UK Model E Model Australian Model Tourist Model SERVICE MANUAL CASSETTE PLAYER MICROFILM SPECIFICATIONS Model Name Using Similar MechanismNEW Tape Transport Mechanism TypeMT-WMEX20-162 Manufactured under license from Dolby Laboratories Licensing Corporation.
2、 “DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation. Tape section Frequency response (Dolby NR off)Playback: 30 18,000 Hz OutputHeadphones (REMOTE 2 jack) Load impedance 8 300 General Power requirements1.5 V One rechargeable battery or one R6 (size AA) batte
3、ry Dimensions (w/h/d)Approx. 78.7 108.6 18.7 mm (31/8 43/8 3/4 inches), incl. projecting parts and controls MassApprox. 180 g (6.4 oz) Approx. 240 g (8.5 oz) (incl. rechargeable battery and a cassette) Supplied accessoriesBattery case (1) Stereo earphones with remote control (1) Battery charger (1)
4、US, CND model : BC-7DC AEP, FR model : BC-7DY E, JE model : BC-7HT UK model : BC-7S AUS model : BC-7SG KR model : BC-9HR Rechargeable battery (1) US, CND, AEP, UK, FR, AUS model : NC-6WM, 1.2V, 600mAh, Ni-Cd KR, E, JE model: NH-14WM, 1.2V, 1400mAh, Ni-MH Rechargeable battery carrying case (1) Carryi
5、ng pouch (1) E, JE, model: AC plug adaptor (1) Design and specifications are subject to change without notice Abbreviation CND : Canadian model FR: French model AUS : Australian model KR: Korea model JE: Tourist model Ver 1.0 1999. 08 2 Notes on chip component replacement Never reuse a disconnected
6、chip component. Notice that the minus side of a tantalum capacitor may be damaged by heat. Flexible Circuit Board Repairing Keep the temperature of soldering iron around 270C during repairing. Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). Be careful not
7、 to apply force on the conductor when soldering or unsoldering. TABLE OF CONTENTS 1. GENERAL 2 2. SERVICE NOTE3 3. DISASSEMBLY 3-1. Lid Assy, Cassette 5 3-2. Case 5 3-3. Ornament (Open) Block Assy 6 3-4. “Sub Board”, “Switch, Leaf”, “Main Board” 6 3-5. Belt (F KAI), Motor (M601)7 3-6. Holder Assy 7
8、3-7. Pinch Lever (N)/(R) Assy 8 3-8. Magnetic Head (HP701) 8 4. MECHANICAL ADJUSTMENT 9 5. ELECTRICAL ADJUSTMENT9 6. DIAGRAMS 6-1. Block Diagram 10 6-2. Printed Wiring Board 12 6-3. Schematic Diagram (1/2) 15 6-4. Schematic Diagra (2/2) 18 6-5. IC Block Diagrams 21 6-6. IC Pin Function Discription 2
9、3 7. EXPLODED VIEWS 7-1. Cabinet Block, Main Board 25 7-2. Mechanism Deck Block 26 8. ELECTRICAL PARTS LIST 27 SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE CO
10、MPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. SECTION 1 GENERAL 1 VOL knob 2 2 REMOTE jack 3 Operation button 4 HOLD/OPERATION knob 5 OPEN knob 6 Dry battery case contact 7 Rechargeable battery compartment 8 Headphones plug 9 DISPLAY
11、window 0 SOUND button ! MODE button ! HOLD button ! 9(PLAY), p(STOP), button ! FF button ! REW button ! VOL knob This section is extracted from instruction manual. ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COMPOSANTS IDENTIFS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHMATIQUES ET LA LISTE DES
12、PICES SONT CRITIQUES POUR LA SCURIT DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PISES SONY DONT LES NUMROS SONT DONNS DANS CE MANUEL OU DANS LES SUPPMENTS PUBLIS PAR SONY. 3 (S702) FWDCNTREV Battery terminal ? Battery terminal ? Square wave (sine wave) 10 Hz, -3.5 dBs jumper GND S PH
13、IN(S)(TP36) T PH IN(S)(TP37) AF OSC Plunger (PM701) ATS SWITCH (S704-2) BP1 TAPE IN SWITCH (S704-1) M601M SECTION 2 SERVICE NOTE Service Mode The service mode enables to operate the mechanism of WM-EX20 while the MAIN board is opened. Rotation of the idler gear (A) (S side) is detected using the pho
14、to- reflector (PH702) in the WM-EX20. PH702 is located on the MAIN board, therefore the rotation of the idler gear (A) (S side) cannot be detected by PH702 when the MAIN board is removed. As a result, the motor cannot be controlled and cannot run correctly. To repair the machine after the MAIN board
15、 is removed while the main power is turned on, follow the procedures as described below. 1. Setting 1)Remove the cabinets referring to section “3. DISASSEMBLY”. Open the MAIN board. 2)Connect the motor (M601) and the plunger solenoid (PM701) to the MAIN board using the jumper wires. When the extensi
16、on jig (1-769-143-11) (10 wires as a set) is used, they can be connected easily. 3)Short the TAPE IN switch land (BP1) with solder. Input a square (or sine) wave of 10 Hz (at 1.3 Vp-p) to both PH IN T land (TP37) and PH IN S land (TP36) with jumper wire. 4)Connect DC 1.3 V from external regulated po
17、wer supply to and terminals of the battery. 2. PRE-SET status The set must be in this state before the PLAY, FF and REW modes can be entered. 1)Make sure that the slider (F/R) is in the center position and that the F/R switch (S702) is in the center position. Make sure that the reel gear does not ro
18、tate by rotating the flywheel on the F side clockwise. If improper, place the set in the preset state according to the following instructions: 2)Repeat the step below some times to ensure the above conditions. *Pull away the trigger level from the plunger with tweezers or other means. Then rotate th
19、e flywheel on the F side clockwise. 3)Turn the stabilized power supply OFF once and then ON. 3. FF, REW modes 1)Check for “2. Preset state” and push the FF switch and the REW switch. 2)Move the F/R switch (S702) to the movement of the slider to enter the FF/REW mode. 4. PLAY mode 1)Check for “2. Pre
20、set state”. 2)Push the 9( switch on the remote commander to move the lever (SW) toward the R side. With timing to this, move the F/ R switch (S702) to enter the PLAY (R side) mode. Note 1: If failed, retry from the preset state. Note 2: The 9(, p, FF, and REW switches on the remote commander should
21、be used whenever possible. MAIN BOARD (SIDE B) 4 Slider (NR) Rotational system 1. Rotational System of PLAY Mode2. Rotational System of FF Mode 3. Rotational System of REW Mode F side flywheel slider (NR) F side centerR side motor pulley reverse pulley insert flywheel (R) insert flywheel (N) gear (r
22、eel) (T side) gear (reel) (S side) idler gear (A) (T side) idler gear (A) (S side) idler gear (B) gear (Y) gear (NR) FWD REV clutch assy (F) motor pulley gear (FR) reverse pulley insert flywheel (R) insert flywheel (N) gear (reel) (T side) idler gear (A) (T side) gear (Y) clutch assy (F) motor pulle
23、y gear (FR) gear (reel) (S side) reverse pulley insert flywheel (R) insert flywheel (N) idler gear (A) (S side) gear (Y) clutch assy (F) 5 SECTION 3 DISASSEMBLY Lid Assy, CassetteCase Ornament (OPEN) Block Assy Sub Board, Switch, Leaf, Main Board Belt (F1), Motor (M601)Set Holder Assy Pinch Lever (N
24、)/(R) AssyMagnetic Head (HP701) Note :Follow the disassembly procedure in the numerical order given. The equipment can be removed using the following procedure. 3-1. LID ASSY, CASSETTE 3-2. CASE 1 Two screws (M1.4 2.2) Lid assy, cassette 3 2 Screw (M1.4 2.2) 4 Mechanism deck block 3 Two screws (M1.4
25、 2.2) 4 Screw (M1.4 1.6) 5 2 Two screws (M1.4 2.2) Case 1 Lid, battery case 6 3-3. ORNAMENT (OPEN) BLOCK ASSY 3-4. “SUB BOARD”, “SWITCH, LEAF”, “MAIN BOARD” Mechanism deck block Ornament (open) block assy 2 1 Release the two claws from the two holes in the direction allow Claw Hole Hole Claw 3 Screw
26、 (M1.4 1.4) 5 Screw (M1.4) 6 SUB board 2 Screw (M1.4) qd MAIN board 1 Screw 4 Unsolder the 6 places. qa Unsolder the motor. 9 Unsolder the plunger. 0 Unsolder the flexible board. qs Claw 7 Screw (M1.4) 8 Switch leaf 7 2 Two screws (M1.4) 4 Motor (M601) 3 Retainer (F1) motor 1 Belt (F KAI) Belt (F KA
27、I) 3-5. BELT (F KAI), MOTOR (M601) 3-6. HOLDER ASSY 4 Screw (M1.4) 2 Shaft 6 Shaft 1 Two screws (M1.4 1.4) 3 Lock lever (B) 0 Remove the holder assy in the direction of the arrow. 8 Remove soldering from Head flexible board. 5 Lock lever (S) 9 Head flexible board 7 Bracket (casette) assy 8 3-7. PINC
28、H LEVER (N)/(R) ASSY 3-8. MAGNETIC HEAD (HP701) Claw Claw 2 Remove the pinch lever (N) assy in the direction of the arrow. Note:Be careful of the claw 1 Remove the pinch lever (R) assy in the direction of the arrow. Note:Be careful of the claw 1 Remove the magnetic head (HP701) in the direction of t
29、he arrow. WM-EX20 9 10 11 SECTION 6 DIAGRAMS 6-1. BLOCK DIAGRAM SECTION 4 MECHANICAL ADJUSTMENTS PRECAUTION 1.Clean the following parts with a denatured-alcohol-moistened swab : playback headpinch roller capstanrubber belt 2.Demagnetize the playback head with a head demagnetizer. 3.Do not use a magn
30、etized screwdriver for the adjustments. 4.After the adjustments, apply suitable locking compound to the parts adjusted. 5.The adjustments should be performed with the rated power supply voltage (1.3 V) unless otherwise noted. Torque Measurement SECTION 5 ELECTRICAL ADJUSTMENT PRECAUTION Supplied vol
31、tage : 1.3 V Switch and control position VOL switch : NORM Remote control position HOLD switch : OFF VOL control : MAX SOUND mode : NORM DOLBY mode : OFF Test tape Tape Speed Adjustment Procedure : 1.Playback WS-48A (tape center part) in the REV state and adjust RV601 so that the frequency counter r
32、eading becomes 3,000 Hz. Specification Value : 2.Playback WS-48A (tape counter part) in the FWD state. Check that frequency counter reading is within 2.5% of reading of step 1. Adjustment Location : Digital frequency counter 2,985 to 3,015 Hz Type WS-48A Signal 3 kHz, 0 dB Used for tape speed adjust
33、ment ModeTorque MeterMeter Reading 15 25 g cm FWD CQ-102C (0.21 0.35 oz inch) FWDless than 2 g cm back tension(less than 0.03 oz inch) 15 25 g cm REV CQ-102RC (0.21 0.35 oz inch) REVless than 2 g cm back tension(less than 0.03 oz inch) more than 50 g cm FF, REWCQ-201B (more than 0.69 oz inch) i test
34、 tape WS-48A (3 kHz, 0 dB) set REMOTE jack (J301) 32 frequency counter RV601 AMS IN DOLBY CTL BOOST CTL F/R CTL SURRUND CTL HI UP CTL XO XI CASSETE SW M/N CTL PHOTO (T) CTL PHOTO (T) IN 40 BEEP47 16 24 14 RV CTL15 55 30 5 8 48 33 22 43 PHOTO (S) IN42 PHOTO (S) CTL20 SPEED DTL35 MOTOR START34 MOTOR U
35、26 MOTOR V27 MOTOR W29 CTRL 154 CTRL 253 MOTOR DIR36 X701 4kHz MUTE CTL31 PSIG CONTROL Q604 SURROUND SWITCH Q304 SURROUND SWITCH Q306 PLUNGER DRIVER Q701,704 RESET IC705 REVIVE CONTROL Q302 REVIVE CONTROL Q303 HI UP CONTROL Q301 RIPPLE FILTER RIPPLE FILTER Q305 VOL MAX SWITCH Q307 DOLBY SWITCH Q312
36、REMOTE SWITCH Q708 VOL MIN SWITCH Q308,310 METAL SWITCH Q313(1/2) T REEL SENS PH701 MOTOR SW Q601 -1 (TAPE IN) -2 (ATS) 12 10 4139 4042434446 S REEL SENS PH702 1/2 SPEED SWITCH Q602 INV. Q705,706 MOTOR START SWITCH Q603 RV601 TAPE SPEED 21 30 29 28 S704 P SIG IN 150 P SIG IN 251 POWER CTL23 16 17 15
37、 1 36 354 5 6 7 8 9 10 31 32 34 19 2 MOTOR SERVO IC601 9 11 13 2 4 6 8 7 10 12 1 3 5 MOTOR DRIVE Q605 8 1 2 SWITCH MTL DRV BEEP BEEP M/N SW F/R SW BST SW PW SW MT SW AMS IN PRE OUT R PRE OUT L PRE NF L PRE NF R + + 7 6 5 4 3 AUDIO AMP IC301 (1/2) VREF FWD L FWD R REV L REV R L R L R REF V ICI1 VI1 V
38、I2 IV U IN V IN W IN CTRL 1 CTRL 2 DIR PSIG UT VT WT UT VT WT WS VS US TU TW TV TU TW TV W V U W V U C 16 WS VS US W OUT V OUT U OUT MCENTER MC B+ (+1.5V) SYSTEM CONTROL IC702 41 37 PM CTL RMUM DATA OUT 19 RST213 A/B SW46 MD SW60 WAKE UP58 BATT DET 262 B+ (+2.0V) 9 SURROUND AMP IC302 VCC B+ (+2.0V)
39、SWITCH Q309 B+ (+2.0V) S301 VOLUME MIN NORM MAX PW IN C PW IN R PW IN L PW NF R PW NF L 26 32 27 28 21 35 22 20 + + METAL SWITCH Q313(2/2) + PW OUT L PW OUT R 33 34 1718 BASERF OUT PW OUT C AGC IN AGC DET AUDIO AMP IC301 (2/2) B+ (+1.5V) B+ (+1.5V) VCC POWER SWITCH IC707 S702 FWD CNT REV S701 (A/B)
40、KEY IN63 BATT DET 161 S703 OPERATION 1 2 3 4 7 13 8 OUT1 OUT2 OUT3 OUT4 CE VCC VOLTAGE DETECT IC703 VOLTAGE DETECT IC704 LX V OUT B+ (+1.5V) B+ (+1.5V) B+ (+1.5V) 3 2 DC/DC CONVERTER IC701 B+ (+1.5V) B+ (+2.0V) RECHAGEABLE BATTERY NH-14WM(1.2V 1400mA) :E,JE,KR MODEL NC-6WM(1.2V 600mA) :US,CND,AUS,AE
41、P,UK, FR MODEL AEP,UK,FR MODELUS,CND,AUS,E,JE,KR MODEL Abbreviation CND : Canadian model AUS : Austratian model FR :French model KR :Korean model JE :Tourist model DC IN 1.5V BATTERY CASE BATTERY CASE DRY BATTERY SIDE AA (IEC DESIGNATION R6) 1PC, 1.5V DRY BATTERY SIDE AA (IEC DESIGNATION R6) 1PC, 1.
42、5V GND REMO DATA VCC J301 REMOTE CAPSTAN /REEL MOTOR M601 HP701 (PLAYBACK) L CH R CH FWD L CH R CH REV INV. Q705,706 Signal path : PB B+ (+1.5V) PW OUTIN D702 L702 + F701 0.25A W701 W702 PM701 PLUNGER 16 1 10 7 DOLBY SWITCH Q311 DOLBY AMP IC303 VCC 11 14 4 + 10 5 1514 11 AMS OUT AMS DET PW Q314 INV.
43、 29 SUB BOARD WM-EX20 12 13 14 6-2. PRINTED WIRING BOARD Note on Printed Wiring Board: Y : parts extracted from the conductor side. z: Through hole. b : Pattern from the side which enables seeing. Caution: Pattern face side:Parts on the pattern face side seen from (Side A)the pattern face are indica
44、ted. Parts face side:Parts on the parts face side seen from (Side B)the parts face are indicated. -2 -2 -2 -1 -1 -1 123 654 123 654 123 654 123 654 123 654 123 654 123 654 1-674-822- 11 (11) 11 (11) 11 (11) 11 (11) 1-674-822- 1-674-823-1-674-823- PH701 (T REEL) PH702 (S REEL) -1-2 S701 (A/B) TAPE SP
45、EED REV CNT FWD Q605 MAIN BOARD (SIDE A) SUB BOARD (SIDE B) SUB BOARD (SIDE A) MAIN BOARD (SIDE B) S301 VOLUME J301 REMOTE MIN NORM MAX S704-1 TAPE IN SWITCH S704-2 ATS SWITCH PM701 (PLUNGER) VUW TV TW C TU L CH L CH FLEXIBLE BOARD R CH R CH HP701 (PLAYBACK ) REV FWD EXCEPT FR MODEL FR MODEL + + + D
46、C IN 1.5V DRY BATTERY SIZE AA (IEC DESIGNATION R6) 1PCS, 1.5V BATTERY CASE BATTERY CASE AEP,UK,FR MODEL DRY BATTERY SIZE AA (IEC DESIGNATION R6) 1PCS, 1.5V US,CND,E,JE,KR,AUS MODEL RECHAGEABLE BATTERY NH-14WM (1.2V 1400mA) :E,JE,KR MOSEL NH-6WM (1.2V 600mA) :US,CND,AEP,UK,FR,AUS MODEL 12 A B C D E F
47、 G 3456789101112131415 16 M601 CAPSTAN/REEL MOTOR Ref. No.Location D701B-5 D702B-5 D703B-6 IC301E-6 IC302C-7 IC303D-5 IC601D-2 IC701B-5 IC702D-11 IC703B-5 IC704B-6 IC705B-5 Q301D-6 Q302D-6 Q303D-7 Q304C-6 Q305E-7 Q306D-6 Q307C-5 Q308C-5 Q309C-6 Q310C-6 Q311C-5 Q312C-4 Q313F-6 Q314E-9 Q601C-1 Q602C-1
48、3 Q603C-3 Q604C-12 Q605D-2 Q701B-6 Q704B-6 Q705C-4 Q706C-4 Q707E-4 Q708C-4 Semiconductor Location Abbreviation CND :Canadian model AUS :Austrarian model FR :French model KR :Korean model JE :Tourist model WM-EX20 15 16 17 6-3. SCHEMATIC DIAGRAM MAIN (1/2) SECTION Note on Schematic Diagram: All capac
49、itors 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. f: internal component. C : panel designation. U : B+ Line. H : adjustment for repair. Power voltage is dc 1.5 V and fed with regulated dc power supply from battery terminal. Voltages and waveforms are
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