sony_wm-ex621_sm.pdf

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1、WM-EX621 AEP Model UK Model E Model Chinese Model Tourist Model SERVICE MANUAL CASSETTE PLAYER Manufactured under license from Dolby Laboratories Licensing Corporation. “DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation. SPECIFICATIONS Model Name Using Simil

2、ar MechanismWM-EX610 Tape Transport Mechanism TypeMT-WMEX610-162 Ver 1.0 2001. 10 Sony Corporation Personal Audio Company Published by Sony Engineering Corporation 9-873-318-01 2001J1600-1 2001.10 Frequency response Playback: 30 - 18 000 Hz Output Headphones (i jack) Load impedance 8 - 300 Power req

3、uirements 1.5 V Rechargeable battery One R6 (size AA) battery Dimensions (w/h/d) Approx. 77.1 108.0 20.5 mm Mass Approx. 158 g Supplied accessories Battery case (1) Stereo headphones or earphones with remote control (1) Battery charger (1) Rechargeable battery (NC-6WM, 1.2 V, 600 mAh, Ni-Cd) (1) Car

4、rying pouch (1) Rechargeable battery carrying case (1) Design and specifications are subject to change without notice. TABLE OF CONTENTS 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. Flexible

5、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. Unleaded solder Boards requiring use

6、 of unleaded solder are printed with the lead free mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with the lead free mark due to their particular size.) : LEAD FREE MARK Unleaded solder has the following characteristics. Unleaded solder m

7、elts at a temperature about 40C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350C. Caution: The printed pattern (copper foil) m

8、ay peel away if the heated tip is applied for too long, so be careful! Strong viscosity Unleaded solder is more viscous (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc. Usable with ordinary solder It is best to use only unleade

9、d solder but unleaded solder may also be added to ordinary solder. SAFETY-RELATED COMPONENT WARNING! 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

10、APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. WM-EX621 2 1. SERVICE NOTE3 2. GENERAL 5 3. DISASSEMBLY 3-1. CASE SUB ASSY 7 3-2. MAIN BOARD 8 3-3. BELT (F4) 8 3-4. MOTOR (CAPSTAN/REEL) (M901) 9 3-5. LID ASSY, CASSETTE 9 3-6. ORNAMENT, REEL 10 3-7. HOLDER (FS) ASSY 10 3-8. LEVER

11、(N)/(R) ASSY, PINCH 11 3-9. HEAD, MAGNETIC (HP901) 11 4. MECHANICAL ADJUSTMENT 12 5. ELECTRICAL ADJUSTMENT 12 6. DIAGRAMS 6-1. BLOCK DIAGRAM 13 6-2. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS 14 6-3. IC BLOCK DIAGRAMS 14 6-4. SCHEMATAC DIAGRAM MAIN BOARD 15 6-5. PRINTED WIRING BOARD MAIN

12、BOARD 16 6-6. IC PIN FUNCTION 17 7. EXPLODED VIEWS 7-1. CABINET BLOCK 19 7-2. MAIN BOARD BLOCK 20 7-3. MACHANISM BLOCK 1 21 7-4. MACHANISM BLOCK 2 22 8. ELECTRICAL PARTS LIST 23 WM-EX621 3 SECTION 1 SERVICE NOTE Service Mode The service mode enables to operate the mechanism of WM-EX621 while the MAI

13、N board is opened. Rotation of the idler gear (A) (S side) is detected using the photo- reflector (PH701) in the WM-EX621. PH701 is located on the MAIN board, therefore the rotation of the idler gear (A) (S side) cannot be detected by PH701 when the MAIN board is removed. As a result, the motor cann

14、ot be controlled and cannot run correctly. To repair the machine after the MAIN board is removed while the main 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 (M901) and th

15、e plunger solenoid (PM901) to the MAIN board using the jumper wires. When the extension jig (1-769-143-11) (10 wires as a set) is used, they can be connected easily. 3)Short the TAPE DETECT switch (S901-1) and the ATS switch (S901-2). 4)Connect an AF oscillator to TP53 (P. IN) and TP14 (GND). 5)Conn

16、ect DC 1.3 V from external regulated power supply to and terminals of the battery. 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 (S701), and the FWD/REV switch is also in the center position. When the

17、se switches are not in the center position, set them to the PRE-SET status as follows. 2)Move the FWD/REV switch (S701) 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 s

18、witch (S701) to the center position in synchronism with the timing when the slider (NR) is moved. 3. FF, REW modes 1)Check that the PRE-SET status is set. 2)Connect square wave or sine wave to TP53 (P. IN) and TP14 (GND). (See illustration below) 3)Press the x switch (S702) to enter the STOP mode. 4

19、)Press the AMS switch (S704). 4. PLAY mode 1)Check that the PRE-SET status is set. 2)Connect square wave or sine wave to TP53 (P. IN) and TP14 (GND). (See illustration below) 3)Press the x switch (S702) to enter the stop mode. 4)When the nN switch (S703) of the MAIN board is pressed, the slider (N/R

20、) moves once to the F side then moves to the R side. When the FWD/REV switch (S701) is pressed in the synchronism with the above timing, the machine can enter the PLAY (R side) mode. Press the nN switch (S703) again, and move the FWD/REV switch (S701) in the synchronism with the motion of slider (NR

21、). It enables the machine to enter into the PLAY (F side) mode. Note 1: When you fail to enter the PLAY mode, re-start from step 2) PRE-SET status. Note 2: Regarding the nN (S703), x (S702), AMS (S704) switches, use these switches of the remote control unit as much as possible. Note 3: If a headphon

22、es are used, the beep sound shows the timing of the FWD/REV switch (S701). MAIN BOARD (SIDE B) TAPE DETECT SWITCH (S901-1) ATS SWITCH (S901-2) Short Plunger (PM901) AF OSC Battery terminal # Battery terminal 3 TP14 (GND) S701 FWD STOP REV FF CUEAMSREVIEW REW YREPEAT (S703) x(S702)PH701 M901 TP53 (P.

23、IN) Square-wave (sine wave) 10 Hz, -3.5 dB M (S704) WM-EX621 4 Slider (NR) Tape drive mechanism Tape drive mechanism in PLAY mode Tape drive mechanism in FF modeTape drive mechanism in REW mode Insert Flywheel (N) Insert Flywheel (R) Pulley (Reverse) Clutch Assy (F) Gear (Y) Cam Gear Gear (REEL) (S

24、side) Motor Pulley Idler Gear (A) (S side) Gear (FR) (REW:Right side) Insert Flywheel (N) Insert Flywheel (R) Pulley (Reverse) Clutch Assy (F) Gear (Y) Cam Gear Gear (REEL) (T side) Motor Pulley Idler Gear (A) (T side) Gear (FR) (FF:Left side) Insert Flywheel (N)Insert Flywheel (R) Pulley (Reverse)

25、Clutch Assy (F) Idler Gear (B) Gear (Y) Cam Gear Gear (REEL) (T side) Gear (REEL) (S side) Motor Pulley Idler Gear (A) (T side)Idler Gear (A) (S side) Gear (NR) (FWD:Left side REV:Right side) Slider (NR) F side R side Center WM-EX621 5 SECTION 2 GENERAL This section is extracted from instruction man

26、ual. CA REV FWD B UK, Australian, and Hong Kong model Other models *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. Plug in firmly. VOL REW () HOLD FF (+) Swing lever x HOLD VOL* YREPEAT* OPEN SOUND MODE Yx* WM-EX621 6 P

27、reparations Prepare a dry battey (not supplied) or the rechargeable battery (supplied). Dry Battery A Attach the supplied battery case, and then insert one R6 (size AA) battery with correct polarity. Note For maximum performance we recommend that you use a Sony alkaline battery. Rechargeable Battery

28、 B 1Insert the supplied rechargeable battery (NC-6WM) into the charger with correct polarity. 2Plug in the charger to the house current (mains). UK, Australian, and Hong Kong model: Full charging takes about 3.5 hours. U.S.A., Canada, European Continent and Saudi Arabian model: Full charging takes a

29、bout 2.5 hours. Korean model: The full charging time depends on the voltage of your mains. 110 V: 10 hours 220 V: 2.5 hours Other models: The full charging time depends on the voltage of your mains. 120 V: 10 hours 220 240 V: 2.5 hours 3Insert the fully charged battery into the rechargeable battery

30、compartment. You can charge the battery about 300 times. When to replace/charge the battery C Replace or charge the battery when “e” flashes in the display on the remote control. Note After the battery is replaced, the setting of the SOUND and MODE buttons will be erased. Playing a Tape 1 Insert a c

31、assette and if the HOLD function is on, slide the HOLD switch in the opposite direction of the arrow to unlock the controls. 2 Press Y(play)x(stop) on the remote control and adjust the volume with VOL. (On the main unit, press YREPEAT.) When adjusting the volume on the main unit Set the VOL control

32、on the remote control at maximum. When adjusting the volume on the remote control Set the VOL control on the main unit to around 6. Play the other side from the beginning (Skip Reverse function) Play the same side from the beginning (Rewind Auto Play function) Repeat the current track (Repeat Single

33、 Track function) * If Yx on the remote control is pressed during fast forward or rewind, the Walkman switches to playback. Other tape operations To play the next track/succeeding 9 tracks from the beginning (AMS*) On the remote control: Press FF once/repeatedly during playback. On the main unit: Mov

34、e the swing lever toward .FF CUE once/repeatedly during playback. To play the current track/previous 8 tracks from the beginning (AMS*) On the remote control: Press REW once/repeatedly during playback. On the main unit: Move the swing lever toward REVIEW REW once/repeatedly during playback. * Automa

35、tic Music Sensor Fast forward/rewind while listening to the sound (CUE/REVIEW) On the remote control: Press and hold FF/REW during playback and release it at the point you want. On the main unit: Move and hold the swing lever toward .FF CUE/REVIEW REW during playback and release it at the point you

36、want. Using Other Functions Adjusting Playback Mode You can adjust the playback direction mode (s or d) as well as the BL SKIP mode (on or off). 1Press MODE repeatedly. With each press the indications change as follows: s v s BL SKIP v d v d BL SKIP When “BL SKIP” is displayed, the tape is fast- for

37、warded to the next track if there is a blank space of longer than 12 seconds. You will hear repeated sets of three short beeps when skipping a blank. When “s” is displayed, both sides of the tape is played repeatedly. When “d” is displayed, both sides of the tape is played once (if you start from R

38、(REV) side, only REV side will be played). Note You cannot adjust the playback mode during fast- forward or rewind. Emphasizing Sound 1Press SOUND repeatedly. With each press, the indications change as follows: RV (Sound Revitalizer): emphasizes treble sound MB (Mega Bass): emphasizes bass sound (mo

39、derate effect) GRV (Groove): emphasizes bass sound (strong effect) none: normal (no effect) Notes If the sound is distorted with the mode “GRV”, turn down the volume of the main unit or select other modes. You cannot change the mode during fast-forward or rewind. Protecting Your Hearing AVLS (Automa

40、tic Volume Limiter System) Hold down MODE until “AVLS” appears in the display. To cancel the AVLS function, hold down MODE again until “AVLS” disappears. Note You cannot turn on/off the AVLS function during fast- forward or rewind. Locking the Controls HOLD Function Slide the HOLD switch in the dire

41、ction of the arrow to lock the controls of the Walkman or the remote control. Move and hold the swing lever toward .FF CUE for 2 seconds or more during stop. Move and hold the swing lever toward REVIEW REW for 2 seconds or more during stop. Press YREPEAT for 2 seconds or more during playback. To sto

42、p a single repeat, press it again. B Operation on the main unit T o Switch playback to the other side Stop playback Fast forward* Rewind* Do this Press YREPEAT during playback. Press x. Move the swing lever toward .FF CUE once during stop. Move the swing lever toward REVIEW REW once during stop. Ope

43、ration on the remote control T o Switch playback to the other side Stop playback Fast forward* Rewind* Play the other side from the beginning (Skip Reverse function) Play the same side from the beginning (Rewind Auto Play function) Repeat the current track (Repeat Single Track function) Press Yx mor

44、e than a second during playback Yx once during playback FF during stop REW during stop FF for 2 seconds or more during stop REW for 2 seconds or more during stop Yx twice during playback To stop a single repeat, press Yx once WM-EX621 7 SECTION 3 DISASSEMBLY Note : Follow the disassembly procedure a

45、s shown in the flow chart below. 3-1. CASE SUB ASSY Note : Follow the disassembly procedure in the numerical order given. 1 Lid,battery case 2 Screw (M1.4 2.5) 3 Two screws (M1.4 2.5) 4 Two screws (M1.4 2.5) 5 Remove the case sub assy in the direction of the arrow. Claw S707 Knob (HOLD) Note : When

46、assembling the case sub assy,align the Knob (HOLD) with the position of S707. Case sub assy Lid assy, cassette Ornament, reel Belt (F4) Holder (FS) assy MAIN board Head, magnetic (HP901) Lever (N)/(R) assy, pinch Motor (Capstan/Reel) (M901)Set WM-EX621 8 3-2. MAIN BOARD 3-3. BELT (F4) SLIDER Note :

47、When assembling the MAIN board, align the slider with the position of S701. 5 Remove soldering (four points) from motor. 4 Remove soldering (two points) from plunger solenoid. 2 Remove soldering (six points) from the head flexible boards. 8 MAIN board Note : Be careful of the claw. 7 Screw (M1.4) Cl

48、aw Head flexible board 1 Shielded sheet 3 Remove soldering (four points) from the leaf switch. S701 6 Two screws (M1.4) 3 Belt (F4) Motor Pulley Insert Flywheel (R) Insert Frywheel (N) Pulley (Reverse) 2 Terminal board (Battery # ) 1Remove soldering from the battery terminal board. Belt (F4) WM-EX62

49、1 9 3-4. MOTOR (CAPSTAN/REEL) (M901) 3-5. LID ASSY, CASSETTE 2 Motor (Capstan/Reel) (M901) 1 Two screws (M1.4) 2 Two screws (M1.4 2.0) 2 Screw (P1.4 2.0) 4 Lid assy,cassette 1 Open the cassette lid. 3 Shaft WM-EX621 10 3-6. ORNAMENT, REEL 3-7. HOLDER (FS) ASSY 2 Claw 4 Two claws 1 Two claws 3 Boss 5 Ornament,reel 9 Remove soldering from six head flexible boards. 0 Remove the holder (FS) assy in the direction of the arrow. 8 Shielded sheet 1 Two screws (M1.4