1、WM-GX680/GX688US ModelAEP ModelWM-GX680E ModelTourist ModelWM-GX688Chinese ModelWM-GX680/GX688SERVICE MANUALSony CorporationPersonal Audio DivisionPublished by Sony Techno Create Corporation9-873-034-132006D16-1 2006.04Ver. 1.3 2006.04RADIO CASSETTE-CORDERModel Name Using Similar Mechanism WM-GX677T
2、ape Transport Mechanism Type MF-WMGX670-162SPECIFICATIONSManufactured under license from Dolby LaboratoriesLicensing Corporation.“DOLBY” and the double-D symbol a are trademarksof Dolby Laboratories Licensing Corporation.Radio sectionFrequency rangeFM : 76.0 90.0 MHz (Tourist Model): 87.5 108 MHz (O
3、ther Models)AM : 531 1710 kHz (Tourist, US Models): 531 1 602 kHz (Other Models)Tape sectionFrequency response(Dolby NR off)Playback: 40 - 15 000 HzRecording/playback: 100 - 8 000 HzOutputHeadphones (iREMOTE) jackLoad impedance 8 - 300 InputMicrophone (MIC) jackGeneralPower requirements1.5 VRecharge
4、able batteryOne R6 (size AA) batteryDimensions (w/h/d)Approx. 108.4 77.7 23.0 mm(438 318 2932 inches)MassApprox. 148 g (5.3 oz)Supplied accessoriesBattery case (1)Stereo headphones or earphones withremote control (1)Battery charger (1)AC plug adaptor (1) (Saudi Arabian,Tourist model)Rechargeable bat
5、tery (NC-6WM, 1.2 V,600 mAh, Ni-Cd) (1)Rechargeable battery carrying case (1)Carrying pouch (1)Stereo microphone (1)Design and specifications are subject tochange without notice.Photo: WM-GX688 2 Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus sid
6、e of a tantalum capacitor may bedamaged by heat.Flexible Circuit Board Repairing Keep the temperature of soldering iron around 270Cduring repairing. Do not touch the soldering iron on the same conductor of thecircuit board (within 3 times). Be careful not to apply force on the conductor when solderi
7、ngor unsoldering.SAFETY-RELATED COMPONENT WARNING!COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITHMARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTSLIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESECOMPONENTS WITH SONY PARTS WHOSE PART NUMBERSAPPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTSPUBLISH
8、ED BY SONY.TABLE OF CONTENTS1. SERVICE NOTE 32. GENERAL 53. DISASSEMBLY3-1. Case assy 63-2. Belt 73-3. Lid block assy, cassette 73-4. Ornament, reel 83-5. Main Board 83-6. Motor (M601) 93-7. Holder (F) Assy 93-8. Lever (N)/(R) Assy, pinch 103-9. Head, magnetic (HP901) 104. MECHANICAL ADJUSTMENT 115.
9、 ELECTRICAL ADJUSTMENT 116. DIAGRAMS6-1. Block Diagram 136-2. Schematic Diagram (1/3) 166-3. Schematic Diagram (2/3) 196-4. Schematic Diagram (3/3) 216-5. IC Block Diagrams 236-6. Printed Wiring Board (SIDE A) 256-7. Printed Wiring Board (SIDE B) 276-8. IC Pin Function Discription 297. EXPLODED VIEW
10、S7-1. Cabinet Block, Main Board 317-2. Mechanism Deck Block 328. ELECTRICAL PARTS LIST 33 3 SECTION 1SERVICE NOTEService ModeThe 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
11、(PH1) in the WM-GX680/688. PH1 is located on the MAINboard, therefore the rotation of the idler gear (A) (S side) cannot bedetected by PH1 when the MAIN board is removed. As a result, themotor cannot be controlled and cannot run correctly.To repair the machine after the MAIN board is removed while t
12、hemain power is turned on, follow the procedures as described below.1. Setting1) 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 extensionjig (1-769-143-11) (1
13、0 wires as a set) is used, they can beconnected 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 statusThe 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), andthe FWD/REV switch is also in the center position. Whenthese switches are not in the center position, set them to thePRE-SET status as follows.2)
15、 Move the FWD/REV switch (S1) to the same position as theslider (NR) is set.3) The slider (NR) can be moved when the main power of theregulated power supply is turned OFF once then back ON.Move the FWD/REV switch (S1) to the center position insynchronism with the timing when the slider (NR) is moved
16、.3. FF, REW modes1) Check that the PRE-SET status is set.2) Connect square wave or sine wave to resistor (R43). (Seeillustration below.)3) Press the p switch (S3) to enter the STOP mode.4) Press the FF PRESET+ switch (S4) and the REW PRESETswitch (S5).4. PLAY mode1) Check that the PRE-SET status is
17、set.2) Connect square wave or sine wave to resistor (R43). (Seeillustration below.)3) Press the p switch (S3) to enter the STOP mode.4) When the 9(REPEAT switch (S9) of the MAIN board ispressed, the slider (NR) moves once to the F side then movesto the R side. When the FWD/REV switch (S1) is pressed
18、 inthe synchronism with the above timing, the machine can enterthe PLAY (R side) mode. Press the 9(REPEAT switch(S9) again, and move the FWD/REV switch (S1) in thesynchronism with the motion of slider (NR). It enables themachine to enter into the PLAY (F side) mode.Note 1: When you fail to enter the
19、 PLAY mode, re-start from step1) 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 aspossible.Note 3: If a headphones are used, the beep sound shows the timingof the FWD/REV switch (S1). MAIN
20、 BOARD (SIDE B) p(S3)ENTER(S10)REC(S11)BAND(S8)MENU(S6)R43(SIDE A)Q15(SIDE A)SET(S7)(S1)FWDSTOPREVBattery terminal Battery terminal Square wave(sine wave)10 Hz, -3.5 dBAF OSCPlunger (PM901)ShortShortTAPE DETECTSWITCH(S901-2)R TUMESWITCH(S901-1)FF PRESET +(S4)REW PRESET (S5)REPEAT(S9)F TUMESWITCH(S90
21、2-1)ATSSWITCH(S902-2)M601M 4 Slider (NR) Tape drive mechanism Tape drive mechanism in PLAY modeTape drive mechanism in FF mode Tape drive mechanism in REW modeSlider (NR)CenterF side R sideInsert Flywheel (N)Pulley (Reverse)Clutch Assy(F)Motor PulleyGear (REEL)(S side)Gear(REEL)(T side)Gear (NR)(FWD
22、 : Left sideREV : Right side)Idler Gear(B)Idler Gear (A)(S side)Idler Gear(A)(T side)Insert Flywheel (R)Cam GearGear (Y)Insert Flywheel (N)Pulley (Reverse)Clutch Assy(F)Motor PulleyGear(REEL)(T side)Idler Gear(A)(T side)Insert Flywheel (R)Cam GearGear (Y)Gear (FR)(FF : Left side)Insert Flywheel (N)P
23、ulley (Reverse)Clutch Assy(F)Motor PulleyGear(REEL)(S side)Idler Gear(A)(S side)Insert Flywheel (R)Cam GearGear (Y)Gear (FR)(REW : Right side) 5 SECTION 2GENERAL LOCATION OF CONTROLSThis section is extractedfrom instruction manual.xVOLVOLHOLDHOLDYREPEATFF (AMS)REW (AMS)YxREWPlug in firmly.iREMOTEFFP
24、RESET RADIO OFFSETMENUTUNE/PRESET +RADIO ON/BANDOFFPRESET +TUNE/PRESET RADIO ON/BANDENTERSOUND MODE MODE AVLS MODEaNRPB TUNE FM PBENTER/COUNTER RESETSETMENUTape counterHOLDHOLD 6 SECTION 3DISASSEMBLYNote : Disassemble the unit in the order as shown below.Note : Follow the disassembly procedure in th
25、e numerical order given.3-1. CASE ASSY3 Screw (M1.4 2.0)2 Two screws(M1.4 2.0)1 Lid, Battery5 Remove the case assyin the direction of the arrow.4 Two screws(M1.4 2.5)knob (HOLD-B)ClawS11S501S2Note: When assembling thecase assy, align theknob (HOLD-B) with theposition of S2.knob (ISS)Note: When assem
26、bling thecase assy, align theknob (ISS) with theposition of S501.knob (REC)Note: When assembling thecase assy, align theknob (REC) with theposition of S11.Set Case assyBeltLid block assy, cassette Main boardOrnament, reel Motor(M601)Holder (F)assyLever (N)/(R) assy,pinchHead, magnetic (HP901) 7 3-2.
27、 BELT3-3. LID BLOCK ASSY, CASSETTE3 BeltBelt2 Terminal board(Battery ) 1 Remove solder fromthe battery terminal board.Belt threading5 Lid block assy, cassette4 Shaft3 Open the cassette lid1 Screw (M1.4 2.0)2 Two screws (M1.4 2.0) 8 3-4. ORNAMENT, REEL3-5. MAIN BOARD1 Ornament, reelRemove the assembl
28、y while removingthe three claws and boss carefully.Note: ClawClawSLIDER8 Remove soldering(two points)from plunger solenoid.6 Screw (B1.7 3)tapping5 Screw (B1.7 3)tapping3 Screw (1.4 1.6)2 Screw (M1.4)7 Screw (M1.4)Toothed lock1 Ats flexible board4 Screw (M1.4)9 Remove soldering(four points) frommoto
29、r.When assembling the MAIN board, align the slider with the position of S1.Note: S1 9 3-6. MOTOR (M601)1 Two screws (M1.4)Toothed lock2 Motor (M601)3-7. HOLDER (F) ASSY4 Screw (M1.4)2 Shaft6 Shaft1 Two screws (M1.4 1.6)3 Lever (B), lock9 Remove the holder (F)assy in the directionof the arrow.5 Lever
30、 (S), lock8 Flexible board7 Bracket (cassette) assy 10 3-8. LEVER (N) / (R) ASSY, PINCH3-9. HEAD, MAGNETIC (HP901)ClawClawNote: Be careful of the claw1 Remove the lever (R) assy, pinchin the direction of the arrow.2 Remove the lever (N) assy, pinchin the direction of the arrow.Note: Be careful of th
31、e claw1 Two screws(M1.4 7.2)2 Remove the head, magnetic (HP901)in the direction of the arrow. 11 SECTION 4MECHANICAL ADJUSTMENTSECTION 5ELECTRICAL ADJUSTMENTPRECAUTION1. Specified voltage : 1.3 V (DC)2. Switch and control positionMENU switchHOLD : OFFVOL : MAXISS : 1TAPE SECTIONTape Speed Adjustment
32、Procedure:1. Enter the FWD playback mode.2. Adjust RV601 so that the value of the frequency counter readingbecomes 3,000 Hz.Specification value:Frequency counter2,940 Hz 3,060 Hz3. Check that the frequency deviation at the beginning and endingof a tape is within 1.5 % (45 Hz).PRECAUTION1. Clean the
33、following parts with a denatured-alcohol-moistenedswab:record/playback/erase head pinch rollerrubber belts capstan2. Demagnetize the record/playback/erase head with a headdemagnetizer. (Do not bring a head demagnetizer close to theerase head.)3. The adjustments should be performed with the rated pow
34、ersupply voltage unless otherwise noted. Torque MeasurementSignal3 kHz, 0 dBUsed forTape Speed AdjustmentTapeWS-48ATest tapeWS-48A(3kHz, 0dB)Set2 REMOTE jack (J701)16 Frequency counter+MAIN BOARD SIDE B RV601L2T2TP6TP5IC21324112T1RV1RV601 : Tape speedadjustmentRV1 : FM VCO adjustmentT2 : AM IF adjus
35、tmentL2 : FM frequency coverageadjustmentT1 : AM frequency coverageadjustmentTP1Adjustment Parts Location :MAIN BOARD SIDE A ModeFWDFWDBack TensionREVREVBack TensionFF, REWTorque MeterCQ-102CCQ-102CCQ-102RCCQ-102RCCQ-201BMeter Reading1.47 to 2.45 mNm(15 to 25 gcm)(0.21 to 0.34 ozinch)Less than 0.20
36、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 AMBAND switch : AMFMBAND : FM Repeat the procedures in each adjustment several ti
37、mes.AM FREQUENCY COVERAGE ADJUSTMENTAdjust for a maximum reading on level meter.T1 531 kHzConfirmation 1,710 kHzFM VCO AdjustmentProcedure :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 counter readingbecomes 19 k
38、Hz.Specification Value :Frequency counter18,900 19,100 HzTUNER SECTION0.01FFM RF signalgeneratorto ANT (TP1)22.5kHz frequency deviation by 400Hz signal.Output level : as low as possiblePut the lead-wireantenna close tothe set.30% amplitude modulation by 400Hzsignal.Output level : as low as possibleA
39、M RF signalgenerator16set+level meter2 REMOTE jack (J701)0.01FFM RF signalgeneratorto ANT (TP1)Carrier frequency : 98MHzModulation : no modulationOutput level : 0.1V (100dB)Frequency counter1F+100kTP5(IC2 Pin !)TP6(IC2 Pin 9)0dB=1VAdjustment Location: MAIN board (See page 11)AM IF ADJUSTMENTAdjust f
40、or a maximum reading on level meter.T2 450 kHzFM FREQUENCY COVERAGE ADJUSTMENTAdjust for a maximum reading on level meter.L2 76 MHzConfirmation 108 MHzWM-GX680/GX688SECTION 6DIAGRAMS 13 14 15 6-1. BLOCK DIAGRAM WaveformNote on Printed Wiring Board:Y: parts extracted from the conductor side.b: Patter
41、n from the side which enables seeing.Note on Schematic Diagram: All capacitors are in F unless otherwise noted. pF: F50 WV or less are not indicated except for electrolyticsand tantalums. All resistors are in and 1/4W or less unless otherwisespecified. f : internal component.C: panel designation.A:
42、B+ Line.H: adjustment for repair. Power voltage is dc 1.5 V and fed with regulated dc powersupply from battery terminal. Voltages and waveforms are dc with respect to groundunder no-signal (detuned) conditions.Main board (1/3)no mark : FM/AM, TAPE STOP( ) : FM : AM: TAPE PBMain board (2/3), (3/3)no
43、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 variations may be noted due to normal produc-tion tolerances. Circled numbers refer to waveforms. S
44、ignal path.E : PBa : RECF : FM51.7kHz1TP3220sec/div5V/div2 IC2 ! VCO 5sec/div50mV/div3IC801 5 PLAY BACK mode75kHz4IC3 & XOUT 5sec/div0.5V/div5sec/div1V/div14B+1.5V16: FM: PB (TAPE): REC (TAPE)L-CH1RFAMPMIX7VCCOSC658MIX OUTIC1FM RF/MIXQ1,4BUFFERIFAMPQ7,14L1FM RFD3D2D1L2FM OSCFMFREQUENCYCOVERAGEQ3LOCA
45、L/DXCF110.7MHz3IF AMP/FM DETX110.7MHz7IC2IF AMP/MPX22AFCF2450KHz6IF AMP/AM DETT2AM IF54VCCRF OUTMIXOSCRF OUTT1AM OSCQ10RFAMPL5AM FERRITE-RODANTENNALPFQ5,62242120MPXPILOTMPXL15R719LP2B18LP2A11IF REQ16LPF1Q11Q9Q13Q1217RV1FM VCORF OUT10IF OUTQ18(2/2)BUFFERQ18(1/2)BUFFERMICJ501R-CHREVR-CHL-CHFWDFWDREVQ508HP901Q503 Q502ISS123S
