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

25、Tape counter HOLD HOLD 6 SECTION 3 DISASSEMBLY Note :Disassemble the unit in the order as shown below. Note :Follow the disassembly procedure in the numerical order given. 3-1.CASE ASSY 3 Screw (M1.4 2.0) 2 Two screws (M1.4 2.0) 1 Lid, Battery 5 Remove the case assy in the direction of the arrow. 4

26、Two screws (M1.4 2.5) knob (HOLD-B) Claw S11 S501 S2 Note: When assembling the case assy, align the knob (HOLD-B) with the position of S2. knob (ISS) Note:When assembling the case assy, align the knob (ISS) with the position of S501. knob (REC) Note:When assembling the case assy, align the knob (REC

27、) with the position of S11. SetCase assy Belt Lid block assy, cassetteMain boardOrnament, reel Motor (M601) Holder (F) assy Lever (N)/(R) assy, pinch Head, magnetic (HP901) 7 3-2.BELT 3-3.LID BLOCK ASSY, CASSETTE 3 Belt Belt 2 Terminal board (Battery ) 1 Remove solder from the battery terminal board

28、. Belt threading 5 Lid block assy, cassette 4 Shaft 3 Open the cassette lid 1 Screw (M1.4 2.0) 2 Two screws (M1.4 2.0) 8 3-4.ORNAMENT, REEL 3-5.MAIN BOARD 1 Ornament, reel Remove the assembly while removing the three claws and boss carefully. Note: Claw Claw SLIDER 8 Remove soldering (two points) fr

29、om plunger solenoid. 6 Screw (B1.7 3) tapping 5 Screw (B1.7 3) tapping 3 Screw (1.4 1.6) 2 Screw (M1.4) 7 Screw (M1.4) Toothed lock 1 Ats flexible board 4 Screw (M1.4) 9 Remove soldering (four points) from motor. When assembling the MAIN board, align the slider with the position of S1. Note: S1 9 3-

30、6.MOTOR (M601) 1 Two screws (M1.4) Toothed lock 2 Motor (M601) 3-7.HOLDER (F) ASSY 4 Screw (M1.4) 2 Shaft 6 Shaft 1 Two screws (M1.4 1.6) 3 Lever (B), lock 9 Remove the holder (F) assy in the direction of the arrow. 5 Lever (S), lock 8 Flexible board 7 Bracket (cassette) assy 10 3-8.LEVER (N) / (R)

31、ASSY, PINCH 3-9.HEAD, MAGNETIC (HP901) Claw Claw Note:Be careful of the claw 1 Remove the lever (R) assy, pinch in the direction of the arrow. 2 Remove the lever (N) assy, pinch in the direction of the arrow. Note: Be careful of the claw 1 Two screws (M1.4 7.2) 2 Remove the head, magnetic (HP901) in

32、 the direction of the arrow. 11 SECTION 4 MECHANICAL ADJUSTMENT SECTION 5 ELECTRICAL ADJUSTMENT PRECAUTION 1.Specified voltage : 1.3 V (DC) 2.Switch and control position MENU switch HOLD: OFF VOL: MAX ISS: 1 TAPE SECTION Tape Speed Adjustment Procedure: 1.Enter the FWD playback mode. 2.Adjust RV601

33、so that the value of the frequency counter reading becomes 3,000 Hz. Specification value: Frequency counter 2,940 Hz 3,060 Hz 3.Check that the frequency deviation at the beginning and ending of a tape is within 1.5 % (45 Hz). PRECAUTION 1.Clean the following parts with a denatured-alcohol-moistened

34、swab: record/playback/erase headpinch roller rubber beltscapstan 2.Demagnetize the record/playback/erase head with a head demagnetizer. (Do not bring a head demagnetizer close to the erase head.) 3.The adjustments should be performed with the rated power supply voltage unless otherwise noted. Torque

35、 Measurement Signal 3 kHz, 0 dB Used for Tape Speed Adjustment Tape WS-48A Test tape WS-48A (3kHz, 0dB) Set 2 REMOTE jack (J701) 16 Frequency counter + MAIN BOARD SIDE B RV601 L2 T2 TP6 TP5 IC2 13 241 12 T1 RV1 RV601 : Tape speed adjustment RV1 : FM VCO adjustment T2 : AM IF adjustment L2 : FM frequ

36、ency coverage adjustment T1 : AM frequency coverage adjustment TP1 Adjustment Parts Location : MAIN BOARD SIDE A Mode FWD FWD Back Tension REV REV Back Tension FF, REW Torque Meter CQ-102C CQ-102C CQ-102RC CQ-102RC CQ-201B Meter Reading 1.47 to 2.45 mNm (15 to 25 gcm) (0.21 to 0.34 ozinch) Less than

37、 0.20 mNm (Less than 2.0gcm) (Less than 0.028 ozinch) 1.47 to 2.45 mNm (15 to 25 gcm) (0.21 to 0.34 ozinch) Less than 0.20 mNm (Less than 2.0gcm) (Less than 0.028 ozinch) More than 4.90 mNm (More than 50 gcm) (More than 0.69 ozinch) 12 AM BAND switch : AM FM BAND : FM Repeat the procedures in each a

38、djustment several times. AM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter. T1531 kHz Confirmation1,710 kHz FM VCO Adjustment Procedure : 1.Connect frequency counter to the positions shown below. 2.Tune the set to 98 MHz. 3.Adjust RV1 so that the value of the frequency cou

39、nter reading becomes 19 kHz. Specification Value : Frequency counter 18,900 19,100 Hz TUNER SECTION 0.01F FM RF signal generator to ANT (TP1) 22.5kHz frequency deviation by 400Hz signal. Output level : as low as possible Put the lead-wire antenna close to the set. 30% amplitude modulation by 400Hz s

40、ignal. Output level : as low as possible AM RF signal generator 16 set + level meter 2 REMOTE jack (J701) 0.01F FM RF signal generator to ANT (TP1) Carrier frequency : 98MHz Modulation : no modulation Output level : 0.1V (100dB) Frequency counter 1F + 100k TP5 (IC2 Pin !) TP6 (IC2 Pin 9) 0dB=1V Adju

41、stment Location: MAIN board (See page 11) AM IF ADJUSTMENT Adjust for a maximum reading on level meter. T2450 kHz FM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter. L276 MHz Confirmation108 MHz WM-GX680/GX688 SECTION 6 DIAGRAMS 13 14 15 6-1. BLOCK DIAGRAM Waveform Note on

42、Printed Wiring Board: Y : parts extracted from the conductor side. b : Pattern from the side which enables seeing. 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 o

43、r less unless otherwise specified. f: internal component. C : panel designation. A : 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 dc with respect to ground under no-signal (detuned) conditions.

44、Main board (1/3) no mark: FM/AM, TAPE STOP () : FM : AM : TAPE PB Main board (2/3), (3/3) no mark: REC / PB () : REC : PB Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal produc- tion tolerances. Waveforms are taken with a oscilloscope. Voltage vari

45、ations may be noted due to normal produc- tion tolerances. Circled numbers refer to waveforms. Signal path. E: PB a: REC F: FM 51.7kHz 1TP32 20sec/div 5V/div 2IC2 ! VCO 5sec/div 50mV/div 3IC801 5 PLAY BACK mode 75kHz 4IC3 & XOUT 5sec/div 0.5V/div 5sec/div 1V/div 14 B+1.5V 16 : FM : PB (TAPE) : REC (

46、TAPE) L-CH 1 RF AMP MIX 7 VCC OSC 6 5 8 MIX OUT IC1 FM RF/MIX Q1,4 BUFFER IF AMP Q7,14 L1 FM RF D3 D2D1 L2 FM OSC FM FREQUENCY COVERAGE Q3 LOCAL/DX CF1 10.7MHz 3 IF AMP/ FM DET X1 10.7MHz 7 IC2 IF AMP/MPX 22 AF CF2 450KHz 6 IF AMP/ AM DET T2 AM IF 5 4 VCCRF OUT MIX OSC RF OUT T1 AM OSC Q10 RF AMP L5

47、 AM FERRITE-ROD ANTENNA LPF Q5,6 2 24 21 20 MPX PILOT MPX L 15 R 7 19LP2B 18LP2A 11IF REQ 16LPF1 Q11 Q9 Q13 Q12 17 RV1 FM VCO RF OUT 10 IF OUT Q18(2/2) BUFFER Q18(1/2) BUFFER MIC J501 R-CH REV R-CH L-CH FWD FWD REV Q508 HP901 Q503Q502 ISS 1 2 3 S501 RF OUT Q514Q510 BIAS OSC Q501 Q504-507 Q511,512 VR

48、EF T501 MIC REG CONT D27 43 CONT C28 42 41 44 3 17 15 14 L R 23 MIC IN L 21 RADIO IN L 20 MIC IN R 18 RADIO IN R 46 MONITOR L 47 MONITOR L 35 REC MUTE 32 REC/PLAY 33 FWD/REV Q515 34 MIC/RADIO IC501 REC AMP OSC 6 BIAS REG 5 BIAS 7 VCC1 8 REG Q509 VCC2 45 B+2.5V B+1.5V Q513 5 1 4 2 44 12 10 IC301(1/2)

49、 PB AMP ANS IN F/R SW Q304 Q19 +2.5VVCC14 4 11 5 10 IC302 DOLBY CONTROL Q305Q303 V REF Q302 IC3 SYSTEM CONTROL Q2 BUFFER DOLBY VCC CTLAVLS CTL2354 BAND AM/FM30 MONO/ST68 IF IN64 AM IN71 RV CTL 56 IMB/GRV CTL 57 AMP CTL 58 FM IN70 DO66 LOCAL/DX65 F/R CTL(PLAY)29 REC CTL53 DOLBY CTL59 F/R CTL(REC)26 RADIO/MIC25 M DATA I/O47 SW13 MUTE CTL 28 AMS IN 37 BEEP 49 PRE CTL 27 BST CTL 55 R DATA OUT 31 PW