索尼SONY WM-FX491ST电路图.pdf

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1、Ver 1.0 2000.01 MICROFILM WM-FX491/FX491ST/FX493/FX493ST RADIO CASSETTE PLAYER SPECIFICATIONS US Model WM-FX493/FX493ST Canadian Model WM-FX491/FX491ST/FX493ST AEP Model E Model Chinese Model WM-FX491/FX493 Model Name Using Similar MechanismWM-FX477 Tape Transport Mechanism TypeMT-WMEX404-147 Photo

2、: WM-FX493 SERVICE MANUAL Frequency range FM: 87.5108 MHz AM: 5301710 kHz (US, Canadian, 5E, 6E model) 5311602 kHz (EXCEPT US, Canadian, 5E, 6E model) Power requirements 3 V DC batteries R6 (size AA) x 2 Dimensions (w/h/d) Approx. 115.8 x 83.2 x 30.1 mm, incl. projecting parts and controls Mass Appr

3、ox. 115 g/Approx. 195 g (incl. a battery and a cassette) Supplied accessories Stereo headphones or earphones with remote control (1) (FX493/FX493ST)/Stereo headphones or earphones (1) (FX491/FX491ST) Design and specifications are subject to change without notice. Abbreviation 5E, 6E : South America

4、Battery life (approximate hours) (EIAJ*) Sony alkaline LR6 (SG)Sony R6P (SR) Tape playback257.5 Radio reception4014 * Measured value by the standard of EIAJ (Electronic Industries Association of Japan). (Using a Sony HF series cassette tape) Note The battery life may shorten depending on the operati

5、on of the unit. ? ? ? ? ? ? ? ? ? ? 2 Specifications . 1 1.GENERAL Location and Function of Controls . 3 2.DISASSEMBLY 2-1. Cabinet (Front) Sub ASSY . 5 2-2. Main Board . 5 2-3. Mechanism Deck . 6 2-4. Belt, Motor (Capstan/Reel) (M901) . 6 2-5. “Holder Sub ASSY, Cassette” . 7 3.ADJUSTMENTS 3-1. Mech

6、anical Adjustments. 8 3-2. Electrical Adjustments. 8 4.DIAGRAMS 4-1. Explanation of IC Terminals.11 4-2. Block Diagram. 13 4-3. Printed Wiring Boards . 15 4-4. Schematic Diagram. 19 5.EXPLODED VIEWS 5-1. Cabinet Section. 23 5-2. Mechanism Deck Section (MT-WMEX404-147) . 24 6.ELECTRICAL PARTS LIST. 2

7、5 Flexible Circuit Board Repairing Keep the temperature of the 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. Notes on chip compone

8、nt replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be dam- aged by heat. TABLE OF CONTENTS ? ? ? ? ? ? ? ? ? ? 3 SECTION 1 GENERAL LOCATION AND FUNCTION OF CONTROLS This section is extracted from instruction manual. A HOLDB TUNING BAND RA

9、DIO ON PRESET REW xY FF PRESET RADIO OFF MB MODE TAPE AVLSFM MODE B FWD REV OPEN MENU SET ENTER Plug in firmly. Branchez fermement. FX493 FX491 VOL FF/PRESET+ TUNING+/ x/RADIO OFF REW/PRESET RADIO ON /BAND VOL Y Yx (RADIO ON/BANDOFF) HOLD FF/PRESET + C FX493FX491 MENU MENU SETSET FX493 REW/PRESET ?

10、? ? ? ? ? ? ? ? ? 4 Listening to the Radio B 1 If the HOLD function is turned on, slide the HOLD switch in the opposite direction of the arrow to unlock the controls. 2 Press RADIO ON/BAND to turn on the radio. 3 Press RADIO ON/BAND repeatedly to select AM, FM1, FM2 or FM3. 4 Press TUNING +/ to tune

11、 in to the desired station. If you keep pressing TUNING+/ for a few seconds, the Walkman will start tuning to the stations automatically. To turn off the radio Press xRADIO OFF. To improve the broadcast reception C For FM: Extend the headphones/earphones cord (antenna) (FX491) or remote control cord

12、 (antenna) (FX493). If the reception is still not good, press MENU repeatedly to set the cursor to FM MODE in the display. For AM: Reorient the unit itself. Presetting Radio Stations You can store radio stations into the units memory. You can preset up to 32 radio stations, 8 for each FM1, FM2, FM3

13、or AM bands. 1 Press RADIO ON/BAND to turn on the radio. 2 Press RADIO ON/BAND repeatedly to select AM, FM1, FM2 or FM3. 3 Press ENTER. The frequency digits and a preset number flash in the display. 4 While the frequency digits and the preset number are flashing, tune in to a station you wish to sto

14、re using TUNING+/, and select a preset number using PRESET+/. 5 While the frequency digits and the preset number are flashing, press ENTER. Notes If you cannot complete step 4 or 5 while the indications are flashing, repeat from step 3. If a station is already stored, the new station replaces the ol

15、d one. To cancel the stored station Follow the procedure above and in step 3, instead of tuning in to a station, press and hold TUNING +/ until “- - - -” is displayed. Press ENTER while “- - - -” is flashing. To play the preset radio stations 1 Press RADIO ON/BAND to select the band. 2 Press PRESET+

16、/. To operate from the remote control (FX493 only) To turn on the radio, press RADIO ON/BANDOFF for more than one second (only while the tape is in stop mode). To select the band, press RADIO ON/BANDOFF for more than one second while the radio is on. To tune in or recall a preset station, press PRES

17、ET + or . To turn off the radio, press RADIO ON/BANDOFF. Using Other Functions To lock the controls Set the HOLD switch to the direction of the arrow to lock the controls. Preparations To Insert Batteries A 1 Slide and open the battery compartment lid, and insert two R6 (size AA) dry batteries with

18、correct polarity. Replace the batteries with new ones when e flashes in the display. Playing a Tape B 1 If the HOLD function is turned on, slide the HOLD switch in the opposite direction of the arrow to unlock the controls. 2 Insert a cassette and press MENU repeatedly to set the cursor to TAPE in t

19、he display. Then press SET to select the tape type. No message: normal (TYPE I) METAL: CrO2 (TYPE II) or metal (TYPE IV) 3 Press Y on the main unit, or if using the remote control (FX493 only), press Y (play)x (stop). Adjust the volume with VOL. When adjusting the volume on the Walkman (FX493 only)

20、Set the VOL control on the remote control at maximum. When adjusting the volume on the remote control (FX493 only) Set the VOL control on the Walkman slightly above the appropriate level. Note on the cassette holder When opening the cassette holder, press the x (stop) button and make sure the tape i

21、s stopped by checking through the cassette window, then slide the OPEN switch. If the cassette holder is opened before the tape is stopped, the tape may loosen and be damaged. Operation on the main unit To Switch playback to the other side Stop playback Operation on the remote control (FX493 only) T

22、o Switch playback to the other side Stop playback Other tape operations To Fast forward* Rewind* Play the same side from the beginning (Auto Play function) Play the other side from the beginning (Skip Reverse function) * For FX493 only: If Yx on the remote control is pressed during fast forward or r

23、ewind, the Walkman switches to playback. To select playback mode Press MENU repeatedly to set the cursor to MODE in the display. Then press SET to select the desired mode. To play Both sides repeatedly Both sides once from the side facing the cassette holder Press Yx for 2 seconds or more during pla

24、yback Yx once during playback Press Y (play)during playback x Select s d Press FF during stop REW during stop REW during playback FF during playback To emphasize bass sound Press MENU repeatedly to set the cursor to MB in the display. Then, press SET to turn MB on. With each press, the indications c

25、hange as follows. MB (MEGA BASS) : emphasizes bass sound No message: off (normal) Notes If the sound is distorted with the mode “MB”, turn down the volume of the main unit or select normal mode. Bass emphasis may not show great effect if the volume is turned up too high. To protect your hearingAVLS

26、(Automatic Volume Limiter System) function When you set the AVLS function to active, the maximum volume is kept down to protect your ears. Press MENU repeatedly to set the cursor to AVLS in the display. Then press SET to show “”. Note The AVLS setting will be canceled when you replace the batteries.

27、 ? ? ? ? ? ? ? ? ? ? 5 SECTION 2 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. 2-1. CABINET (FRONT) SUB ASSY 2-2. MAIN BOARD z The equipment can be removed using the following procedure. Main boardCabinet (Front) sub ASSY Holder sub ASSY, Cassette Mechanism deckBe

28、lt, Motor (Capstan/reel) (M901)Set Cabinet (Front) sub ASSY 4 Screws (B1.7x12) Lid, Battery case Center cabinet 2 OPEN 6 Claws 3 7 1 6 Claws 5 Claws 6 Claws Main board 3 Screw Black Orange White Red Switch (S601) Head flexible board 5 2 1 Remove solder Center cabinet 4 Claws ? ? ? ? ? ? ? ? ? ? 6 2-

29、3. MECHANISM DECK 2-4. BELT, MOTOR (CAPSTAN/REEL) (M901) Mechanism deck Center cabinet 2 1 Claws 1 belt 3 Motor (Capstan/reel) (M901) wheel assy (SP), capstan belt How to apply the belt M901 2 Screws (M1.4) ? ? ? ? ? ? ? ? ? ? 7 Holder sub ASSY, Cassette Center cabinet 1 OPEN 5 Spring (lid up) Hinge

30、 Hinge Hinge 2 4 4 Projection Projection Hinge 3 Move hinge away from projection 3 Move hinge away from projection Holder sub ASSY, Cassette Center cabinet 5 Spring (Lid up) Hinge 4 1 3 2 Hinge 1 Insert the spring (Lid up) to the slot as shown in the figure. 2 3 Insert the hinge of the “Holder sub A

31、SSY, Cassette”. 4 Close the “Holder sub ASSY, Cassette” then press it. 2-5. “HOLDER SUB ASSY, CASSETTE” z CAUTIONS DURING ASSEMBLY ? ? ? ? ? ? ? ? ? ? 8 3-1. MECHANICAL ADJUSTMENTS PRECAUTION 1. Clean the following parts with a denatured-alcohol-moistened swab : playback headpinch roller capstanrubb

32、er belt 2. Demagnetize the playback head with a head demagnetizer. Do not use a magnetized screwdriver for the adjustments. 3. These measurement and adjustment should be performed with the rated power supply voltage (2.5 V) unless otherwise noted. Torque Measurement ModeTorque meterMeter reading FWD

33、 20 42 g cm CQ-102C (0.28 0.58 oz inch) FWDless than 2 g cm back tension(less than 0.027 oz inch) REV 20 42 g cm CQ-102RC (0.28 0.58 oz inch) REVless than 2 g cm back tension(less than 0.027 oz inch) FF, REWCQ-201B more than 60 g cm (more than 0.84 oz inch) SECTION 3 ADJUSTMENTS 3-2. ELECTRICAL ADJU

34、STMENTS PRECAUTION Supplied voltage : 2.5V. Switch and control position MEGA BASS : OFF VOLUME control : maximum AVLS : NORM TAPE SECTION Test Tape TypeSignalUsed for WS-48A3kHz, 0dBTape Speed Adjustment Tape Speed Adjustment Procedure : 1. Playback WS-48A (tape center part) in the FWD state and ad-

35、 just RV601 so that the frequency counter reading becomes 3,000Hz. Standard value : 2,9853,015Hz 2. Playback WS-48A (tape center part) in the REV state. Check that frequency counter reading is within 1.0% of the reading of step 1. Adjustment Location : 0 dB = 0.775V set test tape WS-48A (3kHz, 0dB)

36、frequency counter 32 phones jack (J301) RV601 ? ? ? ? ? ? ? ? ? ? 9 TUNER SECTION AM Section BAND : AM FM Section BAND : FM : US, Canadian, 5E, 6E model : Saudi Arabia model AM IF ADJUSTMENT Adjust for a maximum reading on level meter. T1450kHz AM FREQUENCY COVERAGE ADJUSTMENT Adjust partsFrequency

37、display Reading on digtal voltmeter L4531kHz Adjustment value : 1.7V Standard value : 1.6-1.8V Confirmation1,710kHzStandard value : 8.8V AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter. L2621kHz CT11,395kHz FM FREQUENCY COVERAGE ADJUSTMENT Adjust partsFrequency display Reading on

38、digtal voltmeter Confirmation87.5MHzStandard value : 4.3V L3108MHz Adjustment value : 8.0V Standard value : 7.9-8.1V FM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter. L187.5MHz87.35MHz Confirmation108MHz108.25MHz Abbreviation 5E, 6E : South America Adjustment Location : Main board

39、(See page 10) 0 dB = 1V Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors. AM RF signal generator 30% amplitude modulation by 400Hz signal. Output level : as low as possible Put the lead-wire a

40、ntenna close to the set. R22 R21 C32 R8 C33 R19 R10 R5 124 C10 C11 S702 ENTER C31 C6 C7 R7 BT2 TP21 TP2 C9 C30 C35 Q2 C34 FB301 FB312 FB313 FB201 R L G C38 D3 D C14 FB311 FB101 TP744 FB2 TP1 MODEL (G TP8 L4 L3 CF1 L1 US,CND,5E,6E FL1 TP844 TP204 T1 TP26 FM RF signal generator 22.5kHz frequency devia

41、tion by 400Hz signal. Output level : as low as possible TP26 0.01F MAIN BOARD (Side B) set 32 phones jack (J301) level meter ? ? ? ? ? ? ? ? ? ? 10 Adjustment Location : Frequency Coverage Adjustment Setting : R609 C17 R21 C32 C22 29 R3 R4 R6 R8 R10 R5 IC1 1 5 10 12 13 15 20 24 R12 R16 C16 C21 3 C20

42、 R9 C5 C10 C11 C4 C13 S702 ENTER C31 S707 FF + C12 C6 8 C207 C7 R208 S714 S712 2220 TUNING + R608 R724 R606 R7 TP129 RV601 TP730 TP759 TP770 TP781 (VT) TP21 TP736 TP739 TP740 TP2 C7 Q603 C9 C30 C35 C25 L70 C38 D3 D2 R708 C14 TP708 R723 R702 R703 TP745 FB2 C41 TP735 JC109 JC11 R722 TP731 TP734 TP725 TP764 (GND) TP809 L4 L3 CF 6E TP844 TP204 S705 SET Y TP781 (VT) TP809 (GND) MAIN BOARD (Side B) digital voltmeter (DC range) MAIN BOARD (SIDE A) L4 : AM Frequency Coverage Adjustment L3 : FM Frequency Coverage Adjustment T1 : AM IF Adjustment