SONY WM SR10 Service Manual
WM-SR10
SERVICE MANUAL
Ver 1.1 2003. 05
Model Name Using Similar Mechanism WM-GX221
Tape Transport Mechanism Type MT-WMGX221-175
SPECIFICATIONS
E Model
Frequency range
FM: 87.5 - 108 MHz (Saudi Arabia)
87.6 - 107.9 MHz (Other countries)
AM: 526.5 - 1 606.5 kHz (Saudi Arabia)
531 - 1 602 kHz (Other countries)
Frequency response Playback: 40 - 15 000 Hz
Input Microphone (MIC) jack
Output Headphones (i) jack, Load impedance 8 - 300 Ω
Speaker
Power requirement 3V DC
Dimensions
Approx. 112.0 × 82.5 × 37.5 mm (4
(w/h/d), excl. projecting parts and controls
Mass Approx. 187 g (6.6 oz) (main unit only)
Supplied accessory
Stereo headphones or Stereo earphones (1)
Design and specifications are subject to change without
notice.
Recording: 100 - 8 000 Hz
Approx. 5 cm (2 in.) dia.
Batteries R6 (AA) x 2
External DC 3 V power sources
1
⁄2 × 3 1⁄4 × 1 1⁄2 inches)
Battery life* (approximate hours)
Sony alkaline LR6(SG)**Sony R6P(SR)
(using headphones/earphones)
Tape playback 24 7
Radio reception 48 15
Mic recording 20 4.5
Radio recording 12 3
(using the speaker)
Tape playback 15 4.5
Radio reception 26 6
Radio recording 11.5 3
* Measured value by the standard of JEITA (Japan Electronics and
Information Technology Industries Association).
(Using a Sony HF series cassette tape)
** When using LR6 (SG) Sony “STAMINA” alkaline dry batteries
(produced in Japan).
Note
The battery life may be shorter depending on the operating
condition, the surrounding temperature and battery type.
9-874-215-02
2003E16-1
© 2003.05
RADIO CASSETTE-CORDER
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
WM-SR10
TABLE OF CONTENTS
1. SERVICE NOTE ............................................................... 3
2. GENERAL .......................................................................... 4
3. DISASSEMBLY
3-1. Front Cabinet Assy.......................................................... 5
3-2. MAIN Board ................................................................... 6
3-3. Mechanism Deck (MT-WMGX221-175) ....................... 6
3-4. Belt (CAP), M601, HRP901, HE901 .............................. 7
3-5. Cassette Holder Sub Assy ...............................................7
4. MECHANICAL ADJUSTMENT .................................. 8
5. ELECTRICAL ADJUSTMENT .................................... 8
6. DIAGRAMS ...................................................................... 10
6-1. Block Diagram – Tuner Section –................................. 11
6-2. Block Diagram – Main Section – ................................. 12
6-3. Printed Wiring Boards .................................................. 13
6-4. Schematic Diagram – MAIN Board (1/2) –.................. 14
6-5. Schematic Diagram – MAIN Board (2/2) –.................. 15
6-6. IC Block Diagrams ....................................................... 16
7. EXPLODED VIEWS
7-1. Overall Section ............................................................. 17
7-2. Cabinet (Front) Section ................................................. 18
7-3. Mechanism Deck Section-1 (MT-WMGX221-175) ..... 19
7-4. Mechanism Deck Section-2 (MT-WMGX221-175) ..... 20
8. ELECTRICAL PARTS LIST .......................................21
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 leadfree 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.
2
SECTION 1
SERVICE NOTE
In this set, record/play mode is detected using the switch S704 (TAPE POWER).
S704 is mounted on the MAIN board. If MAIN board is removed, it becomes impossible to detect
record/play mode.
Where MAIN board is removed, when you measure operation and voltage of each part of the mechanism
deck, please turn on S704.
– MAIN Board (SIDE A) —
WM-SR10
S704
3
WM-SR10
• LOCATION OF CONTROLS
SECTION 2
GENERAL
This section is extracted
from instruction manual.
PAUSE
MFF/CUE
mREW/REVIEW
NPLAY**
zREC
xSTOP
ISS
FM ST/MONO
i
MIC (PLUG IN POWER)**
AVLS
* There is a tactile dot beside VOL on the main unit to show the direction to turn up the volume.
** The button/jack has a tactile dot.
(RADIO OFF) TAPE/
AM/FM
BATT indicator
VOL*
TUNING
SPEAKER/ i
DC IN 3 V
Built-in microphone
SOUND BOOST
Battery compartment
4
Note : Disassemble the unit in the order as shown below.
WM-SR10
SECTION 3
DISASSEMBLY
SET
FRONT CABINET ASSY MAIN BOARD
CASSETTE HOLDER SUB ASSY
Note : Follow the disassembly procedure in the numerical order given.
3-1. Front Cabinet Assy
7
Remove soldering
from the two points.
6
flexible flat cable
(CN701)
RED
MECHANISM DECK
(MT-WMGX221-175)
BELT (CAP), M601,
HRP901, HE901
2
two screws
(M1.4) (EG)
3
three claws
4
claw
WHT
8
front cabinet assy
1
5
two claws
two screws
(TP 1.7
×
3.7)
5
WM-SR10
3-2. MAIN Board
2
plate connector (L)
1
screw
(TP B1.7
3
Remove soldering
from the four points.
×
4)
RED
BLU
GND
WHT
5
8
ORG
BLK
7
4
Remove soldering
from the four points.
6
two screws
(TP B1.7
screw
×
3)
(M1.4
joint cover
RED
WHT
MAIN board
×
4)
3-3. Mechanism Deck (MT-WMGX221-175)
2
three screws
(IB LOCK)
1
4
plate connector (R)
5
mechanism deck
(MT-WMGX221-175)
3
screw
(TP B1.7 × 4)
6
3-4. Belt (CAP), M601, HRP901, HE901
)
screw
0
8
two screws
9
HRP901
(REC/PB head)
HE901
qa
(erase head)
4
washer
(stopper N)
5
washer
7
washer
M601
3
(capstan/reel
motor)
WM-SR10
z
Attaching belt (CAP).
belt (CAP)
capstan fly assy (AR)
6
3-5. Cassette Holder Sub Assy
2
boss
1
belt (CAP)
3
two screws (M1.4)
2
5
cassette holder sub assy
4
spring (torsion
1
boss
7
WM-SR10
r
SECTION 4
MECHANICAL ADJUSTMENT
SECTION 5
ELECTRICAL ADJUSTMENT
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback/erase head pinch roller
rubber belts capstan
2. Demagnetize the record/playback head with a head demagnetizer. (Do not bring a 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 unless otherwise noted.
• Torque Measurement
Mode
FWD
FWD
Back Tension
FF, REW
Torque Meter
CQ-102D
CQ-102D
CQ-201B
Meter Reading
19.6 to 39.2 mN•m
(20 to 40 g•cm)
(0.28 to 0.56 oz•inch)
0.49 to 4.9 mN•m
(0.5 to 5.0g•cm)
(0.0069 to 0.069 oz•inch)
More than 49 mN•m
(More than 50 g•cm)
(More than 0.69 oz•inch)
PRECAUTION
1. Specified voltage: 2.5 V (DC)
2. Switch and control position
VOL : MAX
SPEAKER : OFF
AVLS : NORM
SOUND BOOST : OFF
PAUSE : OFF
ISS : 1
FM MODE : FM ST
TAPE SECTION
Set
Signal
3 kHz, 0 dB
2
jack (J301)
16
Ω
Tape
WS-48A
Tape Speed Adjustment
Procedure:
Test tape
WS-48A
(3kHz, 0dB)
1. Enter the FWD playback mode.
2. Adjust RV601 so that the value of the frequency counter reading
becomes 3,000 Hz.
Specification value:
Frequency counter
2,985 Hz – 3,015 Hz
3. Check that the frequency deviation at the beginning and ending
of a tape is within 1.5 % (45 Hz).
Used for
Ta pe Speed Adjustment
+
–
Frequency counte
Adjustment Location : MAIN Board (see page 9)
8
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