Sony WM-FX141 User manual

WM-FX141
US Model
AEP Model
E Model
SERVICE MANUAL
RADIO CASSETTE PLAYER
MICROFILM
Model Name Using Similar Mechanism WM-FX101
Tape Transport Mechanism Type MF-WMFX103-48
SPECIFICATIONS
Radio Frequency
FM : 87.6 – 108 MHz (US, Chilean, LatinAmerica, Central and
South America Models)
: 65.0 – 107.9MHz (East European Model)
: 87.6 – 107.9 MHz (Other Models)
AM : 530 – 1,710 kHz (US, Chilean, LatinAmerica, Central and
South America Models)
: 531 – 1,602kHz (Other Models)
Power requirements
3V DC batteries R6 (size AA) ×2
External DC 3V power sources
Battery life
(Aprroximate hours)
Battery Playback Radio
Sony alkaline LR6 (SG) 16 hrs 48 hrs
Sony R6P (SR) 4.5 hrs 16 hrs
Dimensions
93.9 ×118.5 ×35.9 mm (w/h/d)
(33/4×43/4×13/16 in.) incl. projecting parts
Mass
205g (7.3 oz) incl.batteries
Supplied accessories
•Stereo headphones or earphones (1)
•Belt clip (1)
Design and specifications are subject to change without notice.
Ver 1.3 1999. 05
With SUPPLEMENT-1 (9-923-296-81)
With SUPPLEMENT-2 (9-923-296-82)

— 2 —
TABLE OF CONTENTS
1. GENERAL ·········································································· 3
2. DISASSEMBLY
2-1. Cabinet (Rear) ································································· 4
2-2. Mechanism Deck and Main Board ································· 4
2-3. Main Board ····································································· 5
2-4. Cassette Lid·····································································5
2-5. Dial Pointer Setting························································· 5
3. ADJUSTMENT
3-1. Mechanical Adjustment ·················································· 6
3-2. Electrical Adjustment······················································ 6
4. DIAGRAMS
4-1. Block Diagram ································································ 9
4-2. Schematic Diagram ······················································· 11
4-3. Printed Wiring Board ···················································· 13
4-4. IC Block Diagram ························································· 17
5. EXPLODED VIEWS
5-1. Cabinet and Board Section ··········································· 18
5-2. Mechanism Section (MF-WMFX103-48) ···················· 19
6. ELECTRICAL PARTS LIST ······································· 20
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.

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

— 4 —
SECTION 2
DISASSEMBLY
2-1. CABINET (REAR)
2-2. MECHANISM DECK AND MAIN BOARD
1 Remove the mechanism deck
and main board in the
direction of the arrow.
head flexible board
mechanism dec
k
and MAIN board
* note for installation :
Make sure to put the head flexible
board to ditch before install the
mechanism deck and MAIN board.
Note : Follow the disassembly procedure in the numerical order given.
Note : Disassemble the unit in the order as shown below.
Cabinet (Rear) Mechanism deck and main board Main board
Cassette lid
Dial pointer setting
Cassette lid
Cabinet(rear)
1 Open the cassette lid and release claw A .
2 Remove the cabinet(rear).(Release
all claws
B from M in alphabetical order.)
A
BC
D
E
I
K
M
L
J
H
G
F

— 5 —
2-3. MAIN BOARD
1 head flexible board
3 MAIN boar
d
2 claws
2-4. CASSETTE LID
Front cabine
t
A
3
Cassette lid
(Remove it in the
direction of the arrow)
1 Release the catch A .
2 Release the catch B .
B
2 Align pointer with arrow
marked side as shown in Fig.1
and then fit to groove in the
order of
A and B .
Align
Pointe
r
Fig. 1
Pointer
1 Rotate tune knob fully to arrow direction.
A

B

2-5. DIAL POINTER SETTING

— 6 —
SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured-alcohol-moistend
swab :
playback head pinch roller
capstan rubber belts
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 adjustmentsshould be perfomedwith the ratedpower supply
voltage (2.5V) unless otherwise noted.
Torque Measurement
3-2. ELECTRICAL ADJUSTMENTS
Precaution
•Supplied voltage : 2.5V
•Switch and control position
TAPE switch : NORM
VOLUME control : maximum
AVLS switch : OFF
Mode Torque meter Meter reading
FWD
FWD
Back Tension
FF, REW
CQ-102C
CQ-201B
20 to 42 g•cm
(0.28 to 0.58 oz•inch)
less than 2 g•cm
(less than 0.03 oz•inch)
more than 60 g•cm
(more than 0.83 oz•inch)
TAPE SECTION
•FUNCTION switch : TAPE
Test tape
Type Signal Used for
WS-48A 3kHz, 0dB Tape Speed Adjustment
Tape speed adjustment
Tape selection adjustment : NORM
Procedure :
Adjustment Value: normal tape speed
Adjustthe tape speedadjustment RV601,sothatthe freqencycounter
reading becomes 3,000Hz.
Specification Value:
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
Adjustment Location :
0dB=0.775V
Digital frequency counter
2,945 to 3,015Hz
set
16 Ω
J302(phones)
frequency
counter
test tape
WS-48A
(3kHz, 0dB)

— 7 —
[AM]
BAND: AM
Signal generator
[FM]
BAND : FM
Signal generator
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 620kHz(800kHz)
CT1 1,400kHz(1,300kHz)
TUNER SECTION
Put the lead-wire
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
AM RF signal
generator
0.01 µ F
FM RF signal
generator
antenna termina
l
75kHz(100%) amplitude modulation
by 1kHz signal.
Output level: as low as possible
16 Ω
set
level mete
r
J302 (phones)
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 505kHz(516.5kHz)
CT4 1,750kHz(1,631.5kHz)
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1 455kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2 86.0MHz[64MHz]
CT2 109.5MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 86.0MHz[64MHz]
CT3 109.5MHz
( ) :E, Mexican, East European,AEP
[ ] : East European
Adjustment Location: Main board (See page 8)
0 dB = 1 µV • Repeat the procedures in each adjustment several times for the
maximum level meter indication.
• The frequency coverage and tracking adjustments should be
finally done by the trimmer capacitors.

— 8 —
AdjustmentLocation:Mainboard
CT1
AM Tracking
Adjustment
CT2
FM Tracking
Adjustment
L2
FM Tracking
Adjustment
L1
AM Tracking
Adjustment
L3
FM Frequency
coverage
Adjustment
CT3
FM Frequency
coverage
Adjustment L4
AM Frequency
coverage Adjustment
CT4
AM Frequency
coverage
Adjustment
T1
AM IF
Adjustment
antenna terminal

WM-FX141
— 9 — — 10 —
4-1. BLOCK DIAGRAM
SECTION 4
DIAGRAM
IC301
28
L
JC2
R
M
2
1
23
3 8
19 18
15 12 6
T1
AM IF
CF1
CF2
425 RV301
VOLUME
HP901
E,MX,EE,AEP
MODEL
PLAYBACK
HEAD
M901
REEL/CAPSTAN
MOTOR
5
24
6
18
9
2
↓
↓
1
OFF
14L OUT
13R OUT
FM MIX
AM MIX
AM OSC
FM OSC
FM RF OUT
AM RF IN
FM RF IN
AUDIO AMP
MOTOR DRIVE
IC1
FM/AM,RF/AF AMP
E,MX,EE,AEP MODEL
J302
J301
• Signal path
• Abbreviation
EE : East European model
MX : Mexican model
DC IN 3V
Q301
PHONES
SWITCH
S305
AVLS
S302
POWER
S303(2/2)
LPF CP1
DX → LOCAL
16
13
23 22 20
8
19
17
RV601
TAPE SPEED
+
–
S303(1/2)
(TAPE SEL)
CrO2/METAL ← NORM
S304
(FUNCTION)
FM → AM → TAPE
X1
VCO
AM IF IN
FM IF IN
VCC2 16
LP2
19kHz 10.7MHz
7
L2
FM
TRACKING CT2
CV2
X2
QUAD
DET OUT MPX IN
L3
FM
FREQ.
COVER CT3
CV3
20
L4
AM
FREQ.
COVER
CT4
CV4
24
L1
AM
TRACKING CT1
CV1
22
VCC1
21
: FM
: AM
E: PB

WM-FX141
4-2. SCHEMATIC DIAGRAM — MAIN SECTION —
— 11 — — 12 —
•Waveform
1IC1 !∞
1.5 Vp-p
19kHz
1µsec/div
0.5V/div
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
•¢: internal component.
•U: B+ Line.
•H: adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power
supply from external power voltage jack (J301) .
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : PB
• Voltages aretakenwithaVOM(Inputimpedance10MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
• Signal path.
F: FM
f: AM
E: PB
• Abbreviation
EE : East European model
5E : Chilean model
6E : Latin America model
8E : Central and South America model
MX : Mexican model
L5
THP602 2k 1000PPM
C1
*
JR5 JR1
C5 *
R1 *
L1
L3
L4
C4
*
C3
*
L2
C2
*
C18 *
C19 *
R602 * R601 *
R603 *
R201 *
R202 *
R102
*
R101 *
US,5E,6E,8E
E,MX,AEP
C1
1PF
1PF
3PF
EE
C4
6PF
6PF
9PF
C5
33PF
33PF
0.0022uF/100v
C18,C19
0.018uF
0.012uF
0.012uF
C2
18PF
18PF
6PF
C3
22PF
22PF
8PF
R1
22
22
18
R101,R201
0
10
0
R102,R202
180k
39k
180k
R601
3.9
1.5
1.5
R602
5.6
2.2
2.2
R603
750
680
680
*
J302
M901
(REEL/CAPSTAN)
US,5E,6E,8E
MODEL
JC6
LOCAL
E,MX,EE,AEP MODEL
DX
S303(2/2)
L1
AM FERRITE-ROD ANTENNA
JC2
JC3
LPF
C16 0.022
CP1 *
↓
↓
→→ →→
↑
AM IF
2.8
2.8
2.8
0
1.5
1.5
0.8 2
10.7
MHz
AM
TRACKING
L1,CT1
TUNING
CV1-4
FM TRACKING
L2,CT2
FM FREQ. COVER
L3,CT3 AM FREQ. COVER L4,CT4
AEP,E,MX,EE
MODEL
0
0
0
0

WM-FX141
— 13 — — 14 — — 15 — — 16 —
4-3. PRINTED WIRING BOARD — MAIN SECTION —
Note:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•®: Through hole.
•b: Pattern from the side which enables seeing.
•Abbreviation
EE : East European model
5E : Chilean model
6E : Latin America model
8E : Central and South America model
MX : Mexican model
12
A
B
C
D
E
F
G
345678910111213141516171819202122232425
• Semiconductor
Location
Ref. No. Location
IC1 E-9
IC301 D-6
Q301 E-5

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
— 21 —
< JUMPER CAPACITOR >
JC2 1-216-295-91 SHORT 0 (EE, E, MX, AEP)
JC3 1-216-295-91 SHORT 0 (EE, E, MX, AEP)
JC6 1-216-295-91 SHORT 0
< JUMPER RESISTOR >
JR1 1-216-295-91 SHORT 0 (US, 5E, 6E, 8E)
JR5 1-216-295-91 SHORT 0 (US, 5E, 6E, 8E)
JR7 1-216-296-91 SHORT 0 (US, 5E, 6E, 8E)
< COIL >
L2 1-460-120-11 COIL (WITH CORE) (EXCEPT EE)
L2 1-426-578-11 COIL (WITH CORE) (EE)
L3 1-403-696-11 COIL (WITH CORE) (EXCEPT EE)
L3 1-409-655-11 COIL (WITH CORE) (EE)
L4 1-406-408-11 COIL (OSC) (EXCEPT EE)
L4 1-406-409-11 COIL (OSC) (EE)
L5 1-500-245-11 INDUCTOR CHIP 0uH
L101 1-500-245-11 INDUCTOR CHIP 0uH
L201 1-500-245-11 INDUCTOR CHIP 0uH
L301 1-500-245-11 INDUCTOR CHIP 0uH
< TRANSISTOR >
Q301 8-729-230-49 TRANSISTOR 2SC2712-YG
< RESISTOR >
R1 1-216-009-00 METAL CHIP 22 5% 1/10W
(EXCEPT EE)
R1 1-216-609-11 METAL CHIP 18 0.5% 1/10W
(EE)
R2 1-216-081-00 METAL CHIP 22K 5% 1/10W
R3 1-216-077-00 METAL CHIP 15K 5% 1/10W
R4 1-216-077-00 METAL CHIP 15K 5% 1/10W
R5 1-216-037-00 METAL CHIP 330 5% 1/10W
R101 1-216-295-91 SHORT 0 (EXCEPT E, MX)
R101 1-216-001-00 METAL CHIP 10 5% 1/10W
(E, MX)
R102 1-216-103-00 METAL CHIP 180K 5% 1/10W
(EXCEPT E, MX)
R102 1-216-689-11 METAL CHIP 39K 0.5% 1/10W
(E, MX)
R201 1-216-295-91 SHORT 0 (EXCEPT E, MX)
R201 1-216-001-00 METAL CHIP 10 5% 1/10W
(E, MX)
R202 1-216-103-00 METAL CHIP 180K 5% 1/10W
(EXCEPT E, MX)
R202 1-216-689-11 METAL CHIP 39K 0.5% 1/10W
(E, MX)
R301 1-216-089-91 RES, CHIP 47K 5% 1/10W
R302 1-216-073-00 METAL CHIP 10K 5% 1/10W
R303 1-216-109-00 METAL CHIP 330K 5% 1/10W
R304 1-216-308-00 METAL CHIP 4.7 5% 1/10W
R601 1-216-306-11 METAL CHIP 3.9 5% 1/10W
(US, 5E, 6E, 8E)
R601 1-217-905-11 RES, CHIP 1.5 5% 1/10W
(EE, E, MX, AEP)
R602 1-216-309-00 METAL CHIP 5.6 5% 1/10W
(US, 5E, 6E, 8E)
R602 1-217-905-11 METAL CHIP 1.5 5% 1/10W
(EE, E, MX, AEP)
R603 1-216-046-00 METAL CHIP 750 5% 1/10W
(US, 5E, 6E, 8E)
R603 1-216-045-00 METAL CHIP 680 5% 1/10W
(EE, E, MX, AEP)
< VARIABLE RESISTOR >
RV301 1-223-609-21 RES, VAR, CARBON 10K/10K
RV601 1-241-028-11 RES, ADJ, CARBON 330
< SWITCH >
S302 1-571-986-11 SWITCH, LEAF (POWER)
S303 1-692-298-11 SWITCH, SLIDE (TAPE SEL)
S304 1-692-299-11 SWITCH, SLIDE (FM/AM TAPE)
S305 1-692-898-11 SWITCH, SLIDE (AVLS)
< TRANSFORMER >
T1 1-404-949-11 TRANSFORMER, IF
< THERMISTOR(POSITIVE) >
THP601 1-809-279-11 THERMISTOR, POSITIVE
THP602 1-810-764-11 THERMISTOR, POSITIVE
< VIBRATOR >
X1 1-577-091-11 OSCILLATOR, CRYSTAL (19kHz)
X2 1-567-097-61 FILTER, CERAMIC (10.7MHz)
************************************************************
MISCELLANEOUS
**************
L1 X-3371-847-1 ANTENNA SUB ASSY, BAR
HP901 1-500-115-11 HEAD, MAGNETIC (PLAYBACK)
M901 1-698-353-13 MOTOR, DC (REEL/CAPSTAN)(WITH PULLEY)
************************************************************
ACCESSORIES & PACKING MATERIALS
********************************
1-505-521-11 HEADPHONE (MDR-023) (US, E, EE, 8E, AEP)
8-953-224-90 HEADPHONE (MDR-E802) (5E, 6E, MX)
3-346-518-01 CLIP, BELT
3-860-407-21 MANUAL, INSTRUCTION (ENGLISH) (US, EE, E)
3-860-407-31 MANUAL, INSTRUCTION
(SPANISH, PORTUGUESE) (5E, 6E, 8E, MX)
3-860-407-61 MANUAL, INSTRUCTION
(ENGLICH,POLISH,GREEK,THAI,CZECH,
BRAZILIAN,HUNGARIAN,RUSSIAN)
(AEP)
MAIN

— 22 —
WM-FX141
Sony Corporation
Personal Audio Company 99D1644-1
Printed in Japan © 1999.4
Published by General Engineering Dept.
9-923-296-12