SONYWM-EX20电路图 维修原理图.pdf
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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
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