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
aare trademarks
of Dolby Laboratories Licensing Corporation.
SPECIFICATIONS
Model Name Using Similar Mechanism
WM-EX610
Tape Transport Mechanism Type
MT-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 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.
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 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 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 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.
WM-EX621
2
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
WM-EX621
3
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 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 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. DISASSEMBLY".
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 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
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.
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).
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
CUE
AMS
REVIEW
REW
Y
REPEAT
(S703)
x
(S702)
PH701
M901
TP53 (P.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 mode
Tape drive mechanism in REW mode
Insert Flywheel (N)
Insert Flywheel (R)
Pulley (Reverse)
Clutch Assy (F)
Gear (Y)
Cam Gear
Gear (REEL) (S 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)
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 manual.
C
A
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*
Y
·REPEAT**
OPEN
SOUND
MODE
Y
·x**