Sony wm ex 20 service manual
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Ñ 2 Ñ 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. Flexible Circuit Board Repairing ¥ Keep the temperature of soldering iron around 270ûC 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. TABLE OF CONTENTS 1. GENERAL ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááááááááá 2 2. SERVICE NOTE ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááá 3 3. DISASSEMBLY 3-1. Lid Assy, Cassette ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááá 5 3-2. Case ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááááááááááááááááááááá 5 3-3. Ornament (Open) Block Assy ááááááááááááááááááááááááááááááááááááááááá 6 3-4. ÒSub BoardÓ, ÒSwitch, LeafÓ, ÒMain BoardÓ ááááááááááááááááá 6 3-5. Belt (F KAI), Motor (M601) ááááááááááááááááááááááááááááááááááááááááááá 7 3-6. Holder Assy ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááááááááá 7 3-7. Pinch Lever (N)/(R) Assy ááááááááááááááááááááááááááááááááááááááááááááááá 8 3-8. Magnetic Head (HP701) ááááááááááááááááááááááááááááááááááááááááááááááááá 8 4. MECHANICAL ADJUSTMENT áááááááááááááááááááááááááááááááááá 9 5. ELECTRICAL ADJUSTMENT áááááááááááááááááááááááááááááááááááá 9 6. DIAGRAMS 6-1. Block Diagram ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááá 10 6-2. Printed Wiring Board ááááááááááááááááááááááááááááááááááááááááááááááááááá\ á 12 6-3. Schematic Diagram (1/2) áááááááááááááááááááááááááááááááááááááááááááááá 15 6-4. Schematic Diagra (2/2) ááááááááááááááááááááááááááááááááááááááááááááááááá 18 6-5. IC Block Diagrams ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááá 21 6-6. IC Pin Function Discription áááááááááááááááááááááááááááááááááááááááááá 23 7. EXPLODED VIEWS 7-1. Cabinet Block, Main Board áááááááááááááááááááááááááááááááááááááááááá 25 7-2. Mechanism Deck Block áááááááááááááááááááááááááááááááááááááááááááááááá 26 8. ELECTRICAL PARTS LIST ááááááááááááááááááááááááááááááááááááááá 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 COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. SECTION 1 GENERAL 1· VOL knob 22 REMOTE jack 3Operation button 4HOLD/OPERATION knob 5OPEN knob 6Dry battery case contact 7Rechargeable battery compartment 8Headphones plug 9DISPLAY window 0SOUND button !ÁMODE button !ªHOLD button !£9((PLAY), p(STOP), button !¢FF button !°REW button !¤VOL knob This section is extracted from instruction manual. ATTENTION AU COMPOSANT AYANT RAPPORT Ë LA SƒCURITƒ! LES COMPOSANTS IDENTIFƒS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES PIéCES SONT CRITIQUES POUR LA SƒCURITƒ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIéSES SONY DONT LES NUMƒROS SONT DONNƒS DANS CE MANUEL OU DANS LES SUPPƒMENTS PUBLIƒS PAR SONY.
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Ñ 3 Ñ (S702) FWD¬CNT ®REV Battery terminal Õ Battery terminal Ô Square wave (sine wave) 10 Hz, -3.5 dBs jumper GND S PH IN(S)(TP36) T PH IN(S)(TP37) AF OSC Plunger (PM701) ATS SWITCH (S704-2) BP1 TAPE IN SWITCH (S704-1) M601 M 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 photo- 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 is removed while the main power is turned on, follow the procedures as described below. 1. Setting 1) Remove the cabinets referring to section Ò3. DISASSEMBLYÓ. Open the MAIN board. 2) Connect the motor (M601) and the plunger solenoid (PM701) to the MAIN board using the jumper wires. When the extension 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 power supply to Ô and Õ 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 rotate 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 the flywheel on the F side clockwise. 3) Turn the stabilized power supply OFF once and then ON. 3. FF, REW modes 1) Check for Ò2. Preset stateÓ 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 Ò2. Preset stateÓ. 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 be used whenever possible. Ð MAIN BOARD (SIDE B) Ñ