Sony WM-FX171, WM-FX173, WM-FX177 Service Manual

WM-FX171/FX173/FX177
SERVICE MANUAL
Ver 1.2 2000. 01
With SUPPLEMENT (9-923-333-81)
Photo : WM-FX173
Canadian Model
WM-FX173/FX177
AEP Model
E Model
WM-FX171/FX173
Model Name Using Similar Mechanism NEW Tape Transport Mechanism Type MF-WMFX171-114
• Frequency range
FM : 87.6 - 107.9 MHz AM : 531 - 1,602 kHz
• Power requirements
3V DC batteries R6 (AA) × 2 / External DC 3V power sources
• Dimensions
FX173 : 88.5 × 118.6 × 38.2 mm (3 1/2 × 4 3/4 × 1 9/16 inches) (w / h / d) incl. projecting parts and controls FX171/FX177 : 88.5 × 118.6 × 37.6 mm (3 1/2 × 4 3/4 × 1 1/2 inches) (w / h / d) incl. projecting parts and controls
• Mass
FX173 : Approx. 165 g (5.9 oz) / Approx. 245g (8.7 oz) incl. batteries
and a cassette
FX171/FX177 : Approx. 160 g (5.7 oz) / Approx. 240 g (8.5 oz) incl.
batteries and a cassette
• Supplied accessories
Stereo headphone or Stereo earphones (1) / Belt clip (1)
Design and specifications are subject to change without notice.
MICROFILM
RADIO CASSETTE PLAYER
TABLE OF CONTENTS
1. GENERAL ······································································2
2. DISASSEMBLY
2-1. Cabinet (Front) Assy ··························································3 2-2. Main Board ········································································· 4 2-3. Cassette Lid ········································································4 2-4. Mechanism Deck ································································5 2-5. Belt, Motor (Reel/Capstan) ················································5
3. MECHANICAL ADJUSTMENT ······························ 6
4. ELECTRICAL ADJUSTMENT ································6
5. DIAGRAMS
5-1. Block Diagram ···································································8 5-2. Schematic Diagram (FX171/FX177 Models) ··················10 5-3. Printed Wiring Board (FX171/FX177 Models)················13 5-4. Printed Wiring Board (FX173 Model) ····························· 17 5-5. Schematic Diagram (FX173 Model) ································ 21 5-6. IC Block Diagrams ··························································· 24
6. EXPLODED VIEWS
6-1. Cabinet Section·································································25 6-2. Main Board Section ·························································· 27 6-3. Mechanism Section-1 ······················································· 28 6-4. Mechanism Section-2 ······················································· 29
Flexible Circuit Board Repairing
Keep the temperature of the soldering iron aroud 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.
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.
7. ELECTRICAL PARTS LIST ···································30
SECTION 1
GENERAL
LOCATION OF CONTROL
This section is extracted from instruction manual.
— 2 —
This set can be disassembled in the order shown below.
N)
SECTION 2
DISASSEMBLY
2-1. CABINET (FRONT) ASSY 2-2. MAIN BOARD
2-3. CASSETTE LID
2-4. MECHANISM DECK 2-5. BELT, MOTOR (REEL/CAPSTA
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (FRONT) ASSY
2
Insert the precision screwdriver (1.4 mm flat-blade) into the slit at claw
3
(Release all claws alphabetical order.)
A
and release the claw.
Remove the cabinet (front) assy.
A
B
to L in
Cassette lid
Cabinet (front) assy
1
Two screws
[screw (B 1.7
×
9), tapping]
B
L
C
K
D
E
F
G
H
I
J
— 3 —
2-2. MAIN BOARD
)
3
Remove the four solders.
2
Flexible board (CN302)
6
MAIN board
4
Screw (M 1.4), toothed lock (WH
2-3. CASSETTE LID
2
Insert a precision screwdriver (1.4 mm flat-blade) vertically into portion hinge plate.
3
Portion B to release the hinge plate.
A
to release the
A
5
Two claws
B
1
Head flexible board (CN301)
5
Spring (torsion)
— 4 —
Open the cassette lid.
1 4
Cassette lid.
k
2-4. MECHANISM DECK
1
Insert the precision screwdriver (1.4 mm flat-blabe) in to the slit and release two claws.
2
Remove the mechanism dec
in the direction of the arrow,
2-5. BELT, MOTOR (REEL/CAPSTAN)
2
Two screws [screw (M 1.4), special head]
3
Motor (reel/capstan)
— 5 —
1
Belt
SECTION 3
r
MECHANICAL ADJUSTMENT
SECTION 4
ELECTRICAL ADJUSTMENT
PRECAUTION
1. Clean the following parts with a denatured-alcahol-moistened sweb : Playback head Pinch roller Rubber belt Capstan
2. Demagnetize the playback head using a demagnetizer.
3. Do not use a magnetized screwdriver for adjustments.
4. After adjusting, apply screw-locking compound onto the adjusted parts.
5. Unless specified otherwise, use a specified voltage (3.0V) to perform the adjustments.
Torqu Measurement
Mode
FWD FWD
Back Tension REV REV
Back Tension FF REW
Torque meter
CQ-102C
CQ-102RC
CQ-201B
Meter reading
20 - 30 g · cm
0.4 - 2.0 g · cm 20 - 30 g · cm
0.4 - 2.0 g · cm
More than 40 g · cm
PRECAUTION
1. Specified voltage : 3.0V
2. Switch position AVLS switch : NORM
CASSETTE SECTION
T est Tape
Type
WS-48A
Tape Speed Adjustmnet
Procedure :
Test tape WS-48A (3kHz, 0dB)
1. Playback WS-48A (Tape center part) and adjust RV601 so that the frequency counter reading becomes 3,000Hz ± 15Hz.
2. Playback WS-48A (Tape top and end). Check that frequency counter reading is within 1.5% of the reading of step1.
Signal
3kHz, 0dB
Set
Purpose
Tape Speed Adjustment
Frequency counte
*
1
+ –
PHONES jack
Adjustment Point :
[MAIN BOARD] — SIDE B —
*1 16: E, EA, C & SA, PA Models. 32: AEP, IT, E, CND, FR Models.
RV601 : Tape Speed
• Abbreviation
CND : Canadian IT : Italian EE : East European EA : Saudi Arabia FR : French PA : Panama C & SA : Central and South America
— 6 —
SECTION 5
Set
jack
*
1
+ –
Level meter
(AC : 0.5 – 5V range)
2
t t
8
AM IF IN
FM IF
IN
7
IC301
31
L
R
30
32
1
23
18
15
17
12
6
T1
CF1
CF2
AM IFT
4
35
RV301
VOLUME
HP901
PLAYBACK
HEAD
M901
REEL/CAPSTAN
MOTOR
34
24 18
15
17
2023 19
36
1
8
4
LIMIT
NORMAL
14
L
OUT
13
R
OUT
AM MIX
AM OSC
FM OSC
FM RF OUT
AM RF IN
FM RF IN
PRE + POWER AMP
IC601
MOTOR DRIVE
IC1
FM/AM,RF/AF AMP
MAIN BOARD
J302
J301
DC IN 3V
Q301
PHONES
POWER
MUTE
Q302
ST/MONO
SW
Q2
TU +B
SW
S305
AVLS
D120 BATT
S302
(POWER)
S303(2/2)
DX– LOCAL
15
14
4U
W
IN+
13
S/S
V
VREF
5
6
21 22
9
3
7
25
RV601
TAPE SPEED
S303(1/2)
NORM
Q101 Q201
TAPE SELECT SW
S304
FM – AM – TAPE
LP1
VCC2
16
LP2
VREF
PRE
OUT2
L
MIX IN
2L
MIX
OUT L
MIX
OUT R
PWR
IN2 L
PWR
IN1 R
HP IN
2L
MIX IN
1R
HP IN
1R
PRE
OUT1
R
VREF
L2
FM
TRACKING
CT1(2/4)
CV2(2/4)
X2
QUAD
DET OUT
MPX
IN
L3
FM
FREQ.
COVER
CT1(3/4)
CV3(3/4)
20
L4
AM
FREQ.
COVER
CT1(4/4)
CV4(4/4)
24
L1
AM
TRACKING
CT1(1/4)
CV1(1/4)
CP1
22
VCC1
6
21
RV351
HIGH
RV352
LOW
S351
MEGA BASS
OFF – ON
14
VREF
S351
MEGA BASS
OFF – ON
VREF
M.B
ON/OFF
LOW
BOOST
GAIN
COM
VCC
PWR
MUTE
10
PRE
MUTE
AVLS
PWR
OUT
1(R)
PWR
OUT
2(L)
MEGA BASS UNIT MEGA BASS UNIT
FX-171 MODELFX173 MODEL
BPF
C&SA,CND
MODEL
EXCEPT
C&SA,CND
MODEL
EXCEPT
C&SA,CND
MODEL
S303(2/2)
ST-MONO
C&SA,CND
MODEL
26
(TAPE SELECTOR)
CrO2/
METAL
1/2
2/2
FX171 MODEL
FX171
MODEL
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
2pcs, 3V
DIAGRAMS
WM-FX171/FX173/FX177
TUNER SECTION
[AM]
BAND switch : AM
AM RF signal generator
30% amplitude modulation by 400Hz signal. Output level : as low as possible
[FM]
BAND switch : FM
FM RF signal generator
75kHz(100%) frequency deviation by 1Hz signal. Output level : as low as possible.
Set
• Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
( ) : EA, IT Models [ ] : AEP, E, FR, EE Models
CT1 (4/4)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 620 kHz (800 kHz)
CT1 (1/4) 1,400 kHz (1,300 kHz)
( ) : EA, IT, EE Models
Put the lead-wire antenna close to the set.
0.01µF
Level meter
*
1
+ –
PHONES
505 kHz ± 5 kHz
(516.5 kHz ± 5 kHz)
1,770 kHz ± 20 kHz
(1,631.5 kHz ± 10 kHz)
[1,690 kHz ± 10 kHz]
to IC1 pin
AM IF ADJUSTMENT
5-1. BLOCK DIAGRAM
Adjust for a maximum reading on level meter.
T1
1,000 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
86.0 MHz ± 0.2 MHz
L3
(87.35 MHz ± 0.1 MHz)
[64.0 MHz ± 0.2 MHz]
109.5 MHz ± 0.3 MHz
(108.25 MHz ± 0.2 MHz)
CT1 (3/4)
( ) : EA, IT Models [ ] : EE Model
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
1
L2 86 MHz (87.35 MHz)
CT1 (2/4) 109.5 MHz (108.25 MHz)
( ) : EA, IT Models [ ] : EE Model
Adjustment Parts Location :
[MAIN BOARD] — SIDE A —
L4 : AM FREQUENCY COVERAGE Adjustment
L2 : FM TRACKING Adjustment
T1 : AM IF
L1 : AM TRACKING Adjustmen
L3 : FM FREQUENCY COVERAGE Adjustmen
[MAIN BOARD] — SIDE B —
CT1 (2/4)
CT1 (1/4)
CT1 (4/4)
CT1 (3/4)
[64.0 MHz]
— 7 — — 8 — — 9 —
• Signal path.
F : FM f : AM E : PB
WM-FX171/FX173/FX177
5-2. SCHEMATIC DIAGRAM
(FX171/FX177 MODELS)
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 and specified.
¢
: internal component.
1
4
/
W or less unless otherwise
C : panel designation.
U : B+ Line.
H : adjustment for repair.
• Total current is measured with no cassette installed.
• Power voltage is dc 3V and fed with regulated dc power supply from external power voltage jack.
• Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : PB (TAPE) ( ) : AM < > : FM
• Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal produc­tion tolerances.
• Signal path.
F : FM f : AM E : PB
• Abbreviation CND : Canadian model IT : Italian model EE : East European model EA : Saudi Arabia model FR : French model PA : Panama model C & SA: Central and South America models
101010
10
— 10 — — 11 — — 12 —
5-3. PRINTED WIRING BOARD
(FX171/FX177 MODELS)
• Semiconductor
Location
Ref. No. Location
D120 G-13 IC1 F-14
IC301 E-17 IC601 E-18
Q2 G-14 Q101 E-15 Q201 E-15 Q301 F-16 Q302 F-14
12
A
MAIN BOARD
B
(SIDE A)
WM-FX171/FX173/FX177
3 4 5 6 7 8 9 1011121314151617181920212223
S305
AVLS
NORM
LIMIT
MAIN BOARD
(SIDE B)
MEGA BASS UNIT
6 4 2
OFF
ON
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
2PCS, 3V
BLK
ORG
WHT
RED
M901
REEL/CAPSTAN
MOTOR
C
D
E
F
DX
LOCAL
C&SA,PA, FX177 MODEL
J302
FM ST
MONO
EXCEPT C&SA,PA, FX177 MODEL
NORM
CrO
METAL
TUNING
2
/
1/4
4/4
RV301
(VOLUME)
C&SA,PA FX177 MODEL
WHT
L1
L
R
EXCEPT C&SA,PA,FX177
2/4
3/4
MODEL
1
5
10
24
20
15 1312
16
(POWER)
10181915
25 27
30
28 36
9
5
1
16
ORG
BLK
RED
J301
DC IN 3V
E,C&SA,EA,PA
MODEL
Note:
X : parts extracted from the component side.
®
: Through hole.
b : Pattern from the side which enables seeing. (The other layers' patterns are not indicated.)
Caution: Pattern face side: Parts on the pattern face side seen from (Conductor B) the pattern face are indicated. Parts face side: Parts on the parts face side seen from (Component A) the parts face are indicated.
Abbreviation CND : Canadian IT : Italian EE : East European EA : Saudi Arabia FR : French PA : Panama C & SA: Central and South America
G
16
FM AM
TAPE (RADIO OFF)
(BATT)
H
I
— 13 — — 15 —
— 14 —
HP901
(PLAYBACK HEAD)
L
R
1-667-714-
4 5 3
2
11
(11)
— 16 —
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