Sony WMEX-621 Service manual
WM-EX621
SERVICE MANUAL
Ver 1.0 2001. 10
Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY” and the double-D symbol a are trademarks
of Dolby Laboratories Licensing Corporation.
Model Name Using Similar Mechanism WM-EX610
Tape Transport Mechanism Type MT-WMEX610-162
AEP Model
UK Model
E Model
Chinese Model
Tourist Model
SPECIFICATIONS
Frequency response
Playback: 30 - 18 000 Hz
Output
Headphones (i jack)
Load impedance 8 - 300 Ω
Power requirements
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)
• Carrying pouch (1)
• Rechargeable battery carrying case (1)
Design and specifications are subject to change without notice.
9-873-318-01
2001J1600-1
© 2001.10
CASSETTE PLAYER
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
WM-EX621
TABLE OF CONTENTS
1. SERVICE NOTE ·······························································3
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 (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 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
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 Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
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 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 melts at a temperature about 40°C 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 350°C.
Caution: The printed pattern (copper foil) may 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 flo w) 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 unleaded 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
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
2
SECTION 1
SERVICE NOTE
[Service Mode]
The service mode enables to operate the mechanism of WM-EX621
while the MAIN board is opened.
Rotation of the idler gear (A) (S side) is detected using the photoreflector (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 cannot 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. DISASSEMBL Y”.
Open the MAIN board.
2) Connect the motor (M901) and the 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) Connect DC 1.3 V from e xternal regulated power supply to ‘
and ’ terminals of the battery.
2. PRE-SET status
The PLA Y, FF and REW modes can be entered only from the PRESET 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
these 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 switch (S701) to the center position in
synchronism with the timing when the slider (NR) is moved.
WM-EX621
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) 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) 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). 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 headphones are used, the beep sound shows the timing
of the FWD/REV switch (S701).
TAPE DETECT
SWITCH
(S901-1)
REVIEW
→
AMS
←
FF CUE
Short
REW
ATS
SWITCH
(S901-2)
(S704)
Y
(S703)
x
(S702)
REPEAT
Plunger (PM901)
Battery
terminal
#
– MAIN BOARD (SIDE B) —
AF OSC
10 Hz, -3.5 dB
TP53 (P.IN)
PH701
S701
←
FWD
STOP →REV
TP14
(GND)
Square-wave
(sine wave)
M
M901
Battery terminal
3
3
WM-EX621
)
)
[ Slider (NR) ] [ Tape drive mechanism ]
Tape drive mechanism in PLAY mode
Gear (FR)
(REW:Right side)
Idler Gear (A) (S side)
Slider (NR)
Cam Gear
F side R side
Center
Gear (Y)
Insert Flywheel (N)
Clutch Assy (F)
Insert Flywheel (R)
Tape drive mechanism in FF mode Tape drive mechanism in REW mode
Gear (REEL) (S side)
Motor Pulley
Pulley (Reverse
Idler Gear
(A) (T side)
Gear (REEL) (T side)
Cam Gear
Gear (Y)
Insert Flywheel (N)
Gear (FR)
(FF:Left side)
Clutch Assy (F)
Motor Pulley
Pulley (Reverse)
Insert Flywheel (R)
Gear (NR)
(FWD:Left side
Idler Gear
(A) (T side)
Gear
(REEL) (T side)
Cam Gear
Gear (Y)
Insert Flywheel (N) Insert Flywheel (R)
REV:Right side)
Clutch Assy (F)
Idler Gear (B)
Idler Gear (A) (S side)
Gear (REEL) (S side)
Motor Pulley
Pulley (Reverse
4
B
SECTION 2
GENERAL
CA
WM-EX621
This section is extracted
from instruction manual.
UK, Australian, and
Hong Kong model
Other models
REV
FWD
Plug in firmly.
HOLD
VOL
VOL*
HOLD
REW (–)
Y•REPEAT**
x
Swing lever
OPEN
* 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.
FF (+)
SOUND
MODE
Y•x**
5
WM-EX621
Preparations
Prepare a dry battey (not supplied) or the
rechargeable battery (supplied).
Dry Battery
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
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 about 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 compartment.
You can charge the battery about 300 times.
When to replace/charge the battery
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.
A
B
C
Playing a Tape
1 Insert a cassette 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 Y•REPEAT.)
When adjusting the volume on the main unit
Set the VOL control 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.
Operation on the remote control
To
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
Y•x more than a second
during playback
Y•x 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
Y•x twice during
playback
To stop a single repeat, press
Y•x once
Operation on the main unit
To
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)
* If Y•x on the remote control is pressed during fast
forward or rewind, the Walkman switches to
playback.
Do this
Press Y•REPEAT during
playback.
Press x.
Move the swing lever
toward .FF CUE once
during stop.
Move the swing lever
toward REVIEW REW>
once during stop.
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 Y•REPEAT for 2
seconds or more during
playback.
To stop a single repeat, press it
again.
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: Move 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.
* Automatic 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 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:
B
s
v
s BL SKIP
v
d
v
d BL SKIP
•When “BL SKIP” is displayed, the tape is fastforwarded 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 (REV) side, only
REV side will be played).
Note
• You cannot adjust the playback mode during fastforward 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
(moderate 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
(Automatic 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 fastforward or rewind.
Locking the Controls
— HOLD Function
Slide the HOLD switch in the direction of the arrow
to lock the controls of the Walkman or the remote
control.
6
SECTION 3
)
DISASSEMBLY
Note : Follow the disassembly procedure as shown in the flow chart below.
WM-EX621
Set
Lid assy,
cassette
Case sub assy
Ornament,
reel
MAIN board
Holder (FS)
assy
Note : Follow the disassembly procedure in the numerical order given.
3-1. CASE SUB ASSY
Claw
Belt (F4)
Lever (N)/(R)
assy, pinch
Motor (Capstan/Reel) (M901)
Head, magnetic
(HP901)
1
Lid,battery case
2
Screw
(M1.4
×
2.5)
4
Two screws
(M1.4
×
2.5)
5
Remove the case sub assy
in the direction of the arrow.
S707
3
Two screws
(M1.4
Knob (HOLD)
Note : When assembling the case
sub assy,align the Knob (HOLD
with the position of S707.
×
2.5)
7
WM-EX621
3-2. MAIN BOARD
8
MAIN board
Note : Be careful of the claw.
3
Remove soldering (four points)
from the leaf switch.
2
Remove soldering (six points)
from the head flexible boards.
7
Screw
(M1.4)
Claw
4
Remove soldering (two points)
from plunger solenoid.
S701
6
Two screws
(M1.4)
5
Remove soldering (four points)
from motor.
3-3. BELT (F4)
1
Shielded sheet
Belt (F4)
Head flexible board
Insert Flywheel
(R)
SLIDER
Note : When assembling the MAIN board,
align the slider with the position of S701.
2
3
Belt (F4)
Terminal board
(Battery
#
)
Motor
Pulley
Pulley (Reverse)
Insert Frywheel (N)
1
Remove soldering from
the battery terminal board.
8
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