sony_wm-gx680_gx688_sm.pdf
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1、WM-GX680/GX688 US Model AEP Model WM-GX680 E Model Tourist Model WM-GX688 Chinese Model WM-GX680/GX688 SERVICE MANUAL RADIO CASSETTE-CORDER Model Name Using Similar MechanismWM-GX677 Tape Transport Mechanism TypeMF-WMGX670-162 SPECIFICATIONS Manufactured under license from Dolby Laboratories Licensi
2、ng Corporation. “DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation. Radio section Frequency range FM : 76.0 90.0 MHz (Tourist Model) : 87.5 108 MHz (Other Models) AM : 531 1710 kHz (Tourist, US Models) : 531 1 602 kHz (Other Models) Tape section Frequency re
3、sponse (Dolby NR off) Playback: 40 - 15 000 Hz Recording/playback: 100 - 8 000 Hz Output Headphones (iREMOTE) jack Load impedance 8 - 300 Input Microphone (MIC) jack General Power requirements 1.5 V Rechargeable battery One R6 (size AA) battery Dimensions (w/h/d) Approx. 108.4 77.7 23.0 mm (438 318
4、2932 inches) Mass Approx. 148 g (5.3 oz) Supplied accessories Battery case (1) Stereo headphones or earphones with remote control (1) Battery charger (1) AC plug adaptor (1) (Saudi Arabian, Tourist model) Rechargeable battery (NC-6WM, 1.2 V, 600 mAh, Ni-Cd) (1) Rechargeable battery carrying case (1)
5、 Carrying pouch (1) Stereo microphone (1) Design and specifications are subject to change without notice. Photo: WM-GX688 Ver 1.0 2000. 11 2 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. Flexi
6、ble 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 to apply force on the conductor when soldering or unsoldering. SAFETY-RELATED COMPONENT WARNING
7、! 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. TABLE OF CONTENTS 1. SERVICE NO
8、TE3 2. GENERAL 5 3. DISASSEMBLY 3-1. Case assy 6 3-2. Belt 7 3-3. Lid block assy, cassette 7 3-4. Ornament, reel 8 3-5. Main Board 8 3-6. Motor (M601) 9 3-7. Holder (F) Assy9 3-8. Lever (N)/(R) Assy, pinch 10 3-9. Head, magnetic (HP901) 10 4. MECHANICAL ADJUSTMENT 11 5. ELECTRICAL ADJUSTMENT 11 6. D
9、IAGRAMS 6-1. Block Diagram 13 6-2. Schematic Diagram (1/3) 16 6-3. Schematic Diagram (2/3) 19 6-4. Schematic Diagram (3/3) 21 6-5. IC Block Diagrams 23 6-6. Printed Wiring Board (SIDE A) 25 6-7. Printed Wiring Board (SIDE B) 27 6-8. IC Pin Function Discription 29 7. EXPLODED VIEWS 7-1. Cabinet Block
10、, Main Board 31 7-2. Mechanism Deck Block 32 8. ELECTRICAL PARTS LIST 33 3 SECTION 1 SERVICE NOTE Service Mode The service mode enables to operate the mechanism of WM-GX680/ 688 while the MAIN board is opened. Rotation of the idler gear (A) (S side) is detected using the photo- reflector (PH1) in th
11、e WM-GX680/688. PH1 is located on the MAIN board, therefore the rotation of the idler gear (A) (S side) cannot be detected by PH1 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
12、 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 (PM901) to the MAIN board using the jumper wires. When the extension jig (1-769-143-11) (10
13、wires as a set) is used, they can be connected easily. 3)Short the TAPE DETECT switch (S901-2), R TUME switch (S901-1), F TUME switch (S902-1) and ATS switch (S902-2). 4)Connect an AF oscillator to resistor (R43). 5)Connect DC 1.3 V from external regulated power supply to and terminals of the batter
14、y. 2. PRE-SET status The PLAY, FF and REW modes can be entered only from the PRE- SET status. 1)Check that the slider (NR) is in the center position (S1), and the FWD/REV switch is also in the center position. When these switches are not in the center position, set them to the PRE-SET status as foll
15、ows. 2)Move the FWD/REV switch (S1) to the same position as the slider (NR) is set. 3)The slider (NR) can be moved when the main power of the regulated power supply is turned OFF once then back ON. Move the FWD/REV switch (S1) to the center position in synchronism with the timing when the slider (NR
16、) is moved. 3. FF, REW modes 1)Check that the PRE-SET status is set. 2)Connect square wave or sine wave to resistor (R43). (See illustration below.) 3)Press the p switch (S3) to enter the STOP mode. 4)Press the FF PRESET+ switch (S4) and the REW PRESET switch (S5). 4. PLAY mode 1)Check that the PRE-
17、SET status is set. 2)Connect square wave or sine wave to resistor (R43). (See illustration below.) 3)Press the p switch (S3) to enter the STOP mode. 4)When the 9(REPEAT switch (S9) of the MAIN board is pressed, the slider (NR) moves once to the F side then moves to the R side. When the FWD/REV switc
18、h (S1) is pressed in the synchronism with the above timing, the machine can enter the PLAY (R side) mode. Press the 9(REPEAT switch (S9) again, and move the FWD/REV switch (S1) in the synchronism with the motion of slider (NR). It enables the machine to enter into the PLAY (F side) mode. Note 1: Whe
19、n you fail to enter the PLAY mode, re-start from step 1) PRE-SET status. Note 2: Regarding the 9(REPEAT (S9), p (S3), FF PRESET+ (S4), and REW PRESET (S5) switches, use these switches of the remote control unit as much as possible. Note 3: If a headphones are used, the beep sound shows the timing of
20、 the FWD/REV switch (S1). MAIN BOARD (SIDE B) p (S3) ENTER (S10) REC (S11) BAND (S8) MENU (S6) R43 (SIDE A) Q15 (SIDE A) SET (S7) (S1) FWDSTOPREV Battery terminal Battery terminal Square wave (sine wave) 10 Hz, -3.5 dB AF OSC Plunger (PM901) Short Short TAPE DETECT SWITCH (S901-2) R TUME SWITCH (S90
21、1-1) FF PRESET + (S4) REW PRESET (S5) REPEAT (S9) F TUME SWITCH (S902-1) ATS SWITCH (S902-2) M601M 4 Slider (NR) Tape drive mechanism Tape drive mechanism in PLAY mode Tape drive mechanism in FF modeTape drive mechanism in REW mode Slider (NR) Center F side R side Insert Flywheel (N) Pulley (Reverse
22、) Clutch Assy(F) Motor Pulley Gear (REEL)(S side)Gear (REEL)(T side) Gear (NR) (FWD : Left side REV : Right side) Idler Gear(B) Idler Gear (A)(S side) Idler Gear (A)(T side) Insert Flywheel (R) Cam Gear Gear (Y) Insert Flywheel (N) Pulley (Reverse) Clutch Assy(F) Motor Pulley Gear (REEL)(T side) Idl
23、er Gear (A)(T side) Insert Flywheel (R) Cam Gear Gear (Y) Gear (FR) (FF : Left side) Insert Flywheel (N) Pulley (Reverse) Clutch Assy(F) Motor Pulley Gear (REEL)(S side) Idler Gear (A)(S side) Insert Flywheel (R) Cam Gear Gear (Y) Gear (FR) (REW : Right side) 5 SECTION 2 GENERAL LOCATION OF CONTROLS
24、 This section is extracted from instruction manual. x VOL VOL HOLD HOLD YREPEAT FF (AMS) REW (AMS) Yx REW Plug in firmly. iREMOTE FF PRESET RADIO OFF SETMENU TUNE/PRESET + RADIO ON/ BANDOFF PRESET + TUNE/PRESET RADIO ON/BAND ENTER SOUND MODE MODE AVLS MODEaNR PBTUNEFMPB ENTER/COUNTER RESET SET MENU
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