sony_wm-fx888.pdf
SERVICE MANUAL Ver 1.0 2001.11 9-873-396-01Sony Corporation 2001K0500-1Personal Audio Company C 2001.11Published by Sony Engineering Corporation RADIO CASSETTE PLAYER E Model Chinese Model Tourist Model SPECIFICATIONS WM-FX888 Manufactured under license from Dolby Laborato- ries. “Dolby” and the double-D symbol are trademarks of Dolby Laboratories. Model Name Using Similar MechanismWM-FX675 Tape Transport Mechanism TypeMF-WMFX671-162 Radio section Frequency range FM: 87.5 - 108 MHz AM: 530 - 1 710 kHz (North, Central, and South America) 531 - 1 602 kHz (other countries) Tape section Frequency response (Dolby NR off) Playback: 40 - 15 000 Hz Output Headphones (i) jack Load impedance 8 - 300 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 2932 inches) Mass Approx. 160 g (5.7 oz) Supplied accessories AC power adaptor (1) Battery case (1) Stereo headphones or earphones with remote control (1) Charging stand (1) Rechargeable battery (NC-6WM, 1.2 V, 600 mAh, Ni-Cd) (1) Rechargeable battery carrying case (1) Carrying pouch (1) Design and specifications are subject to change without notice. Battery life (Approx. hours)(JEITA*) Sony alkaline LR6 (SG)* Tape playback36 Radio reception32 Rechargeable battery (NC-6WM) Tape playback10 Radio reception10 Sony alkaline LR6 (SG)* and Rechargeable NC-6WM Tape playback45 Radio reception42 * Measured value by the standard of JEITA (Japan Electronics and Information Technology Industries Association). (Using a Sony HF series cassette tape) *When using a Sony LR6 (SG) “STAMINA” alkaline dry battery (produced in Japan). Note The battery life may be shorter depending on the operating condition, the surrounding temperature and battery type. 2 WM-FX888 Note on the AC power adaptor Use only the supplied AC power adaptor. Do not use any other AC power adaptor. Polarity of the plug TABLE OF CONTENTS 1.SERVICING NOTES.3 2.GENERAL.5 3.DISASSEMBLY 3-1.Disassembly Flow .6 3-2.Case Section .6 3-3.MAIN Board .7 3-4.Belt (F2) .7 3-5.Motor (Capstan/Reel) (M601) .8 3-6.Cassette Lid Sub Assy.8 3-7.Reel Ornament Block Assy.9 3-8.Holder (F) Assy (/M) .9 3-9.Pinch Lever (RA)/(NA) Assy . 10 3-10. Magnetic Head (Playback) (HP901) . 10 4.MECHANICAL ADJUSTMENTS. 11 5.ELECTRICAL ADJUSTMENTS. 11 6.DIAGRAMS 6-1.Block Diagram TUNER Section . 13 6-2.Block Diagram MAIN Section . 14 6-3.Note for Printed Wiring Board and Schematic Diagrams . 15 6-4.Printed Wiring Board MAIN Board (Side A) . 16 6-5.Printed Wiring Board MAIN Board (Side B) . 17 6-6.Schematic Diagram MAIN Board (1/2) . 18 6-7.Schematic Diagram MAIN Board (2/2) . 19 6-8.IC Pin Function Description . 21 7.EXPLODED VIEWS 7-1.Case Section . 23 7-2.Chassis Section . 24 7-3.Main Section . 25 7-4.Mechanism Deck Section-1 (MF-WMFX671-162). 26 7-5.Mechanism Deck Section-2 (MF-WMFX671-162). 27 7-6.Mechanism Deck Section-3 (MF-WMFX671-162). 28 8.ELECTRICAL PARTS LIST. 29 Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be dam- aged by heat. Flexible Circuit Board Repairing Keep the temperature of the soldering iron around 270 C dur- ing 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! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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 PUB- LISHED BY SONY. 3 WM-FX888 SECTION 1 SERVICING NOTES This set detects the rotation of the idler gear (A) (side S) using the PH1 (photo reflector). The PH1 is mounted on the MAIN board, therefore the idler gear (A) (side S) cannot be detected with the MAIN board removed. As a result, the motor (M601) cannot be controlled, causing malfunction. Further, the DIRECTION switch (S1) is also mounted on the MAIN board, and with the board removed, the mechanism position can- not be detected and the operation is not changed over. Therefor, when the voltage check is executed with the MAIN board removed, follow the procedure provided below. 1.Setting (1)Refer to “3. DISASSEMBLY”, and remove the MAIN board. (2)Connect the MAIN board to the motor (M601) and the plunger (PM901) using jumper wires. These can be connected easily with the use of the extension tool (Part No. 1-769- 143-11) (ten in one set). (3)Short the TAPE DETECT switch (S901-1) terminals and the ATS switch (S901-2) terminals. (4)Connect the AF oscillator to the Q15-1 (COLLECTOR) and the TP23 (GND). (5)Supply 1.3 V to the battery terminals using the regulated power supply. 2.Preset state To set the PLAY, FF, REW modes, the preset state must be set. (1)Check that the slider (NR) and the DIRECTION switch (S1) are set to the center position. If not, set the preset state as follow. (2)Move the DIRECTION switch (S1) to the side, which the slider (NR) is facing. (3)The slider (NR) will move when the regulated power supply switch is set to OFF once and then set to ON. Move the DI- RECTION switch (S1) according to this timing and set to the center position. 3.FF, REW modes (1)Check that the preset state is set. (2)Input the square wave or sine wave to the Q15-1 (COLLEC- TOR) and the TP23 (GND). (3)Press the RADIO OFF button (S3) to set the STOP mode. (4)Press the + FF button (S4) or the - REW button (S5). 4.PLAY mode (1)Check that the preset state is set. (2)Input the square wave or sine wave to the Q15-1(COLLEC- TOR) and the TP23 (GND). (3)Press the RADIO OFF button (S3) to set the STOP mode. (4)Press the REPEAT button (S9) will move the slider (NR) once towards the side R and then to the side F. Move the DIRECTION switch (S1) according to this timing will set the PLAY mode (side F). Press the REPEAT button (S9) another time and move the DIRECTION switch (S1) according to the movement of the slider (NR) will set the PLAY (R mode). Note 1: If the above fails, perform from preset again. Note 2: Use the REPEAT (S9), RADIO OFF (S3), + FF (S4), and - REW (S5) buttons on the remote controller as much as possible. If no remote controller, do not touch the buttons with your hands, but using a stick with a round tip. Note 3: When using headphones, the timing for move the DIRECTION switch (S1) can be determined from the beep sound. + + FF (S4) connect to the plunger (PM901) battery terminal # battery terminal 3 square wave (sine wave) 10 Hz, 3.5 dB AF oscillator TAPE DETECT (S901-1) MAIN Board (side B) ATS (S901-2) REW (S5) TP23 (GND) S1 DIRECTION FWDTSTOPtREV Y REPEAT (S9) x RADIO OFF (S3) PH1 Q15 connect to the motor (M601) x x Y Y Yx 4 WM-FX888 Slider (NR)Rotation system Rotation system during PLAY. Rotation system during FF.Rotation system during REW. slider (NR) side F side R center insert flywheel (N)insert flywheel (R) reverse pulley clutch assy (F) gear (Y) cam gear gear (REEL) (side T)motor pulley idler gear (A) (side T) gear (FR) (FF: left side) insert flywheel (N)insert flywheel (R) reverse pulley clutch assy (F) idler gear (B) gear (Y) cam gear gear (REEL) (side T) gear (REEL) (side S) motor pulley idler gear (A) (side T) idler gear (A) (side S) gear (NR) (FWD : left side/ REV : right side) insert flywheel (N)insert flywheel (R) reverse pulley clutch assy (F) gear (Y) cam gear gear (REEL) (side S) motor pulley idler gear (A) (side S) gear (FR) (REW: right side) 5 WM-FX888 F E G RADIO OFF SETMENU TUNE/PRESET + RADIO ON/ BANDOFF + TUNE/PRESET ENTER SET MENU HOLD HOLD BAND RADIO ON TerminalsTerminalsTerminals SOUND MODE B C D x VOL* VOL HOLD HOLD YREPEAT* FF (AMS) REW (AMS) Yx* REW Plug in firmly. i FF MENUSET A CHARGE FWD (forward) side REV (reverse) side * There is a tactile dot beside VOL on the main unit to show the direction to turn up the volume. *The button has a tactile dot. SECTION 2 GENERAL This section is extracted from instruction manual. WM-FX888 6 S2 lever (hold) Note: On installation cassette lid assy adjust the S2 and lever (hold). cassette lid assy 4Close terminal board assy. 5two screws (M1.4) 6screw (M1.4) 2claw 1open battery lid. 3battery lid 7case section 5two screws (M1.4) This set can be disassembled in the order shown below. 3-1.DISASSEMBLY FLOW SECTION 3 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. 3-2.CASE SECTION set 3-2. CASE SECTION (page 6) 3-6. CASSETTE LID SUB ASSY (page 8) 3-7. REEL ORNAMENT BLOCK ASSY (page 9) 3-8. HOLDER (F) ASSY (/M) (page 9) 3-9. PINCH LEVER (RA)/(NA) ASSY (page 10) 3-10. MAGNETIC HEAD (PLAYBACK) (HP901) (page 10) 3-3. MAIN BOARD (page 7) 3-4. BELT (F2) (page 7) 3-5. MOTOR (CAPSTAN/REEL) (page 8) WM-FX888 7 3-3.MAIN BOARD 3-4.BELT (F2) 2screw (M1.4) (toothed lock) 3MAIN board 2screw (1.7 3) 2screw (1.7 3) 1Remove six solders of head flexible board. 1Remove four solders of motor (M601). 1Remove two solders of plunger solenoid (PM901). 1Remove four solders of leaf switch (S901). slider S2 Note: On installation MAIN board adjust the S2 and slider. 2battery terminal board 1Remove solder of battery terminal board. 3belt (F2) motor pulley reverse pulley insert flywheel (R) belt (F2) insert flywheel (N) WM-FX888 8 3-5.MOTOR (CAPSTAN/REEL) (M601) 3-6.CASSETTE LID SUB ASSY 2motor (capstan/reel) (M601) 1two screws (M1.4) 2two screws (M1.4) 2screw (M1.4) 3boss 1Open knob (open). 4cassette lid sub assy WM-FX888 9 3-7.REEL ORNAMENT BLOCK ASSY 3-8.HOLDER (F) ASSY (/M) 2claw 4two claws 5reel ornament block assy 3boss 1 1 7bracket (cassette) assy (/M) 2boss 6boss 3lock lever (B) (/M) 5lock lever (S) (/M) 1two screws (IB lock) 4screws (M1.4) 8Remove six solders of head flexible board. 9holder (F) assy (/M) WM-FX888 10 3-9.PINCH LEVER (RA)/(NA) ASSY 3-10. MAGNETIC HEAD (PLAYBACK) (HP901) 1claw 3claw 2Remove pinch lever (RA) assy in the direction of the arrow. 4Remove pinch lever (NA) assy in the direction of the arrow. holder (F) assy/M 3claw 1claw 2 4magnetic head (playback) (HP901) 11 WM-FX888 SECTION 4 MECHANICAL ADJUSTMENTS SECTION 5 ELECTRICAL ADJUSTMENTS Tape Speed Adjustment Setting: Function: TAPE Procedure: 1.Playback WS-48A (tape center) in the FWD state. 2.Adjsut RV601 so that the frequency counter reading becomes 3,000 Hz. Specification Values: 2,970 to 3,030 Hz 3.Playback WS-48A (tape center) in the REV state. Check that the frequency counter reading is within 2% (approx.60 Hz) of the reading of step 1. Adjustment Location: MAIN BOARD (See page 12) PRECAUTION 1.Specified voltage: 1.3 V (DC) 2.Setting SOUND RV/MB/GRV : OFF AVLS: OFF ;NR: OFF BL SKIP: OFF TAPE DECK SECTION0 dB=0.775 V Test tape TypeSignalUsed for WS-48A3 kHz, 0 dBTape Speed Adjustment + set Test tape WS-48A (3 kHz, 0 dB) frequency counter 16 i jack (J701) PRECAUTION 1.Clean the following parts with a denatured-alcohol-moistened swab: playback headpinch roller rubber beltscapstan 2.Demagnetize the playback head with a head demagnetizer. (Do not bring the head demagnetizer close to the erase head.) 3.Do not use a magnetized screwdriver for the adjustments. 4.The adjustments should be performed with the rated power supply voltage (1.3 V) unless otherwise noted. Torque Measurement ModeTorque MeterMeter Reading (1.47 2.94 mNm) FWD15 25 gcm CQ-102C (0.22 0.36 ozinch) (0.029 0.196 mNm) FWD 0.3 2.0 gcm Back Tension (0.004 0.01 ozinch) (1.47 2.94 mNm) REV15 25 gcm CQ-102RC (0.22 0.36 ozinch) (0.029 0.196 mNm) REV 0.3 2.0 gcm Back Tension (0.004 0.01 ozinch) (more than 3.43 mNm) FF, REWCQ-201Bmore than 35 gcm (more than 0.5 ozinch) 12 WM-FX888 AM IF ADJUSTMENT Adjust for a maximum reading on level meter T2450 kHz AM VT VOLTAGE ADJUSTMENT Adjustment PartFrequency DisplayReading on Digital Voltmeter T1531 kHz1.5 0.1 V Confirmation1602 kHz8.5 1 V FM VT VOLTAGE ADJUSTMENT Adjustment PartFrequency DisplayReading on Digital Voltmeter L287.5 MHz3.4 0.1 V Confirmation108 MHzLess than 10 V TUNER SECTION0 dB=1 V AM Setting: function: RADIO BAND button : AM FM Setting: function: RADIO BAND button : FM Repeat the procedures in AM IF adjustment and AM tracking adjustment for a maximum reading on level meter. FM VCO Adjustment Setting: Procedure: 1.Connect the frequency counter to pin qs of IC2 as shown the figure below. 2.Tune the set to 98 MHz. 3.Adjust RV1 for 19 kHz reading on the frequency counter. Specification: 18.95 kHz to 19.05 kHz Adjustment Location: 0.001 F FM RF SSG Carrier frequency : 98 MHz Modulation: no modulation Output level: 0.1 V (100 dB) TP1 (FM IN) + digital voltmeter TP2 (VT) + IC2 pin qs + 1 F frequency counter 33 k MAIN Board (Side B) TP1 (FM IN) IC2 1 12 T2 AM IF Adjustment T1 AM VT Voltage Adjustment L2 FM VT Voltage Adjustment RV1 FM VT Adjustment RV601 Tape Speed Adjustment TP2 (VT) AM RF signal generator 30% amplitude modulation by 400 Hz signal Output level: as low as possible Put the lead-wire antenna close to the set. + level meter set 16 i jack (J701) FM RF signal generator 22.5 kHz frequency deviation by 400 Hz signal Output level: as low as possible + level meter i jack (J701) set 16 0.01 F TP1 (FM IN) WM-FX888 1313 3 22 24 2 FM IF AMP FM DET AF AMP PRE AMP AM IF AMP RF AMP MIX AMP OSC DECODER AMP BUFFER Q18 MUTING Q19 SWITCH 1/2 COUNTER 1/2 COUNTER AM DET STOP PULSE AGC PD1 VCO PD2 20 21 MIX AMP OSC 6 FM IF-IN DET OUT 10 IF-OUT X1 10.7MHz SYSTEM CONTROLLER IC3 (1/2) CF2 450kHz 7 QUAD 14 15 L-OUT R-OUT 17161918 AM IF-IN LP2A PILOT LP2B LPF1 VCO OSC AM RF-IN MIX FM/AM IF AMP, FM/AM DET, MPX IC2 (1/2) AM MIX AMP, OSC IC2 (2/2) FM RF AMP, MIX AMP, OSC IC1 CF1 10.7MHz RV1 FM VCO L2 FM VT VOLTAGE T1 AM VT VOLTAGE T2 AM IF B.P.F. FM VCO BUFFER Q1, 4 STEREO/MONO SWITCHING Q12 LOW-PASS FILTER Q5, 6 IF BUF
