Sony Walkman WM-FX267 User manual

MICROFILM
SERVICE MANUAL
RADIO CASSETTE PLAYER
US Model
WM-FX267/FX269
AEP Model
E Model
WM-FX267
Model Name Using Similar Mechanism WM-FX251
Tape Transport Mechanism Type MF-WMFX251-114
• Frequency range
FM: 87.5-108MHz
AM: 530-1710kHz (US)
AM: 531-1602kHz (EXCEPT US)
• Power requirements
3V DC batteries AA (R6) ×2/External DC 3V
power sources
• Demensions
115 ×90.5 ×34.4mm (4 5/8×3 5/81 3/8inches) (w/h/d)
incl. projecting parts and controls
• Mass
Approx. 150g (5.3 oz)
Approx. 230g (8.2 oz) incl. batteries and a tape
• Supplied accessories
Stereo headphones or earphones (1)
Carrying case (1)
Design and specifications are subject to change without notice.
SPECIFICATIONS
WM-FX267/FX269
Photo: WM-FX267 US model
Ver 1.3 2000. 05
With SUPPLEMENT-1
(9-923-300-81)
With SUPPLEMENT-2
(9-923-300-82)

– 2 –
TABLE OF CONTENTS
1. GENERAL .................................................................. 3
2. DISASSEMBLY ........................................................ 6
3. MECHANICAL ADJUSTMENTS ...................... 9
4. ELECTRICAL ADJUSTMENTS
Tape Section .................................................................... 9
Tuner Section .................................................................. 10
5. DIAGRAMS
5-1. IC Pin Function Description ........................................... 12
5-2. Block Diagram ................................................................ 13
5-3. Printed Wiring Board ...................................................... 15
5-4. Schematic Diagram ......................................................... 19
6. EXPLODED VIEWS................................................ 24
7. ELECTRICAL PARTS LIST ............................... 27
HOWTO CHANGETHE CERAMIC FILTERS
This model is used two ceramic filters of CF2 and X2.
You must used same type of color marked ceramic filters in order
to meet same specifications.
Therefore, the ceramic filter must changed two pieces together
since it's supply two pieces in one package as a spare parts.
Mark Center frequency
red 10.70MHz
blue 10.67MHz
orange 10.73MHz
black 10.64MHz
white 10.76MHz
mark CF2
X2
Flexible Circuit Board Repairing
•Keep the temperature of the soldering iron around 270 ˚C dur-
ing 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 component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SERVICING NOTES

– 3 –
SECTION 1
GENERAL This section is extracted from
instruction manual.

– 4 –

– 5 –

– 6 –
Note: Follow the disassembly procedure in the numerical order given.
SECTION 2
DISASSEMBLY
CABINET (FRONT) ASS’Y
• This set can be disassembled in the order shown below.
1 Insert the precision screwdriver
(1.4 mm flat-blade) in to the slit
at claw A and release the claw.
2 Remove the cabinet (front) ass’y.
(Release all claw B to N in
alphabetical order.)
Note: On installation cabinet (front) ass’y
adjust the S306 and joint (MB).
CABINET (FRONT) ASS’Y
(Page 6)
CASSETTE HOLDER
(Page 7)
MAIN BOARD
(Page 7) MECHANISM DECK
(MF-WMFX251-114)
(Page 8)
BELT,
MOTOR (REEL/CAPSTAN)
(M901)
(Page 8)
SET
J
I
H
G
F
E
D
C
B
N
M
L
K
Joint (MB)
S306
Cabinet (front) ass’y
cassette holder
A
cabinet (front) ass’y

– 7 –
MAIN BOARD
CASSETTE HOLDER
2 Insert a precision screwdriver
(1.4 mm flat-blade) vertically
in to portion A to release the
hinge plate.
3 Portion B to release the
hinge plate.
3 screw (M1.4)
5 MAIN board
4 two claws
1 flexible board
(CN301)
2 Removal the
four solders.
A
B
center cabinet
5 torsion sprin
g
1 Open the cassette holder.
4 cassette holder

– 8 –
MECHANISM DECK (MF-WMFX251-114)
BELT, MOTOR (REEL /CAPSTAN) (M901)
1 Insert the precision screwdriver
(1.4 mm flat-blade) in the slit
and relese two claws.
2 Remove the mechanism deck
(MF-WMFX251-114) in the
direction of the arrow A .
A
2 two screws
(M1.4
× 1.6)
3 motor (reel/capstan)
(M901)
1 belt

– 9 –
SECTION 3
MECHANICAL ADJUSTMENTS SECTION 4
ELECTRICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured-alcoholmoistened
swab: playback head pinch roller
capstan rubber belt
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage (2.5V) unless otherwise noted.
Torque Measurement
Mode Torque Meter Meter Reading
FWD 20 – 42 g•cm
CQ-102C (0.28 – 0.58 oz•inch)
FWD less than 2 g•cm
Back Tension (less than 0.03 oz•inch)
FF, REW CQ-201B more than 60 g•cm
(more than 0.83 oz•inch)
Precaution
• Supplied voltage: 2.5 V
• Switch and control position
TAPE switch: NORM
RADIO switch : ST (AEP and French models)
:DX (US and E models)
VOLUME CONTROL: maximum
AVLS switch: NORM
MEGA BASS switch: OFF
Test tape
Tape Speed Adjustment
Procedure:
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
TAPE SECTION
+
–
test tape
WS-48A
(3 kHz, 0dB) frequency counter
set
2 jack
16 Ω
Playback WS-48A (tape center part) and adjust RV601 so that the
frequency counter reading becomes 2,985 to 3,015 Hz.
Adjustment Location:
RV601
0 dB=0.775 V

– 10 –
TUNER SECTION
FM SECTION
Setting:
RADIO ON/OFF switch: ON
BAND switch: FM
FMTuning Voltage Adjustment
FMTracking Adjustment
FM TUNING VOLTAGE ADJUSTMENT
Adjust for a 9.0 Vdc reading on digital voltmeter
L3
108 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
87.5 MHz
AM SECTION
Setting:
RADIO ON/OFF switch: ON
BAND switch: AM
AMTuning Voltage Adjustment
AM TUNING VOLTAGE ADJUSTMENT
Adjust for a 1.0 Vdc reading on digital voltmeter
L4
530 (531) kHz
( ): Except US model
AM IF Adjustment, AM Tracking Adjustment
* Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer ca-
pacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
1000 (999) kHz
( ): Except US model
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1 (BAR ANTENNA) CT1
620 (621) kHz 1400 (1395) kHz
( ): Except US model
Modulation: 1 kHz, 75 kHz dev. (100%)
Output level: as low possible.
+0.5
–0
digital voltmete
r
+
–
  
MAIN board
(VT)
(GND)
FM RF
signal generator
0.01 µ F
    
MAIN board
(FM RF IN)
(GND)
2 jack
16 Ω
set +
level meter
(AC: 0.5 – 5 V range)
–
digital voltmete
r
+
–
  
MAIN board
(VT)
(GND)
AM RF Signal generator Put the lead-wire
antenna close to
the set.
Modulation: 400 Hz, 30%
Output level: as low possible.
2 jack
16 Ω
set +
level meter
(AC: 0.5 – 5 V range)
–
0 dB=1 µV
+ 0.1
–0