Sony Walkman WM-FX277 User manual

Ver 1.0 2000.03
WM-FX277/FX467/FX467ST
RADIO CASSETTE PLAYER
SPECIFICATIONS
US Model
Model Name Using NEW
Mechanism Type
Similar Mechanism WM-FX277 : MF-WMFX277-114
Tape Transport WM-FX467/FX467ST : MF-WMFX467-114
Photo :WM-FX467
SERVICE MANUAL
• Frequency range
FM: 87.5 - 108 MHz
AM: 530 - 1,710 kHz
TV: 2 - 13 ch
• Power requirements
3V DC batteries R6 (AA) x2
• Dimensions (w/h/d)
Approx. 91.4 x115.5 x35.0 mm (3 5⁄8x4 5⁄8x1 7⁄16 inches)
incl. projecting parts and controls
• Mass
FX467/FX467ST: Approx. 155 g (5.5 oz)/Approx. 235 g (8.3 oz) incl.
batteries and a cassette
FX277: Approx. 145 g (5.2 oz)/Approx. 225 g (8.0 oz) incl. batteries
and a cassette
• Supplied accessories
Stereo headphones or Stereo earphones (1)
Carrying case with belt clip(1)
Design and specifications are subject to change without notice.
Battery life (approximate hours) (EIAJ*)
Sony alkaline LR6 (SG) Sony R6P (SR)
Tape playback 25 7.5
Radio reception 40 14
* Measured value by the standard of EIAJ (Electronic Industries
Association of Japan). (Using a Sony HF series cassette tape)
Note
• The battery life may shorten depending on the operation of the unit.

– 2 –
Specifications ........................................................................... 1
1. GENERAL
Location and Function of Controls .................................... 2
2. DISASSEMBLY
2-1. Cabinet (Front) ........................................................... 3
2-2. Main Board ................................................................. 3
2-3. Mechanism Deck ........................................................ 4
2-4. Belt, Capstan/Reel Motor (M601) .............................. 4
2-5. Cassette Holder........................................................... 5
3. ADJUSTMENTS
3-1. Mechanical Adjustments............................................. 6
3-2. Electrical Adjustments ................................................ 6
4. DIAGRAMS
4-1. Explanation of IC Terminals....................................... 9
4-2. Block Diagram.......................................................... 10
4-3. Printed Wiring Boards .............................................. 13
4-4. Schematic Diagram................................................... 17
5. EXPLODED VIEWS
5-1. Cabinet Section......................................................... 21
5-2. Mechanism Deck Section (WM-FX277).................. 22
5-3. Mechanism Deck Section
(WM-FX467/FX467ST) ........................................... 23
6. ELECTRICAL PARTS LIST................................... 24
Flexible Circuit Board Repairing
• Keep the temperature of the 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.
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.
TABLE OF CONTENTS
SECTION 1
GENERAL
LOCATION AND FUNCTION OF CONTROLS
This section is extracted from
instruction manual.
HOLD
OFF
AM
FM
TV
TUNING + / -
ENTER
MEGA BASS
NORM •CrO2 / METAL
DX •LOCAL
AVLS
NORM •LIMIT
VOLUME
xSTOP
M
NPLAY
m
DIR •Y
(FX467 / FX467ST only)
MODE •s/ d
(FX467 / FX467ST only)
PRESET+ FX467/FX467ST
i

– 3 –
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (FRONT)
2-2. MAIN BOARD
zThe equipment can be removed using the following procedure.
Main boardCabinet (Front)
Cassette holder
Mechanism deck Belt, Capstan/reel motor (M601)
Set
Cabinet (Front)
Cabinet (center) sub ASS
Y
Cassette holder
4Claw
4Claw
2
5
1Claws
1Claws
3Claws
1Claws
Main board
1Screw
Orange
Black
White
Red
Cabinet (center) sub ASS
Y
Head flexible board
2Remove solder
3Claws 4

– 4 –
2-3. MECHANISM DECK
2-4. BELT, CAPSTAN/REEL MOTOR (M601)
Mechanism deck
Cabinet (center) sub ASS
Y
1Claws
2
2Belt
Stopper
1Claw
4Capstan/reel motor
(M601)
wheel ASSY (P), capstan
(FX467/FX467ST)
wheel ASSY (P), capstan
Belt
• How to apply the beltCapstan/reel motor
(M601)
3Screws (M1.4)
Mechanism deck

– 5 –
Cassette holder
4Spring (torsion)
Hinge
Hinge
1
5
Hinge
Cabinet (center)
sub ASSY
Hinge
Projection
Projection 3Move the hinge away
from projection
2Move the hinge away
from projection
Spring (torsion)
Hinge
Hinge
Cassette holde
r
Cabinet (center) sub ASSY
124
3
1Insert the spring (torsion) to the L shape slot as shown in the figure.
2,3Insert the hinge of the “Cassette holder ”.
4Close the “Cassette holder”then press it.
2-5. CASSETTE HOLDER
zCAUTIONS DURING ASSEMBLY

–6 –
SECTION 3
ADJUSTMENTS
3-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
•Supplied voltage : 2.5V.
•Switch and control position
MEGA BASS : OFF
VOLUME control : maximum
AVLS : NORM
TAPE SECTION
TestTape
Type Signal Used for
WS-48A 3kHz, 0dB Tape Speed Adjustment
Tape Speed Adjustment
Procedure:
(FX277)
1. Playback WS-48A (tape center part) and adjust RV601 so that
the frequency counter reading becomes 3,000Hz.
Standard value : 2,985–3,015Hz
2. Playback WS-48A(tape top and end) .
Check that frequency counter reading is within ±1.0% of the
reading of step 1.
(FX467/FX467ST)
1. Playback WS-48A (tape center part) in the FWD state and ad-
just RV601 so that the frequency counter reading becomes
3,000Hz.
Standard value : 2,985–3,015Hz
2. Playback WS-48A(tape center part) in the REV state.
Check that frequency counter reading is within ±1.0% of the
reading of step 1.
AdjustmentLocation:
0 dB = 0.775V
set
test tape
WS-48A
(3kHz, 0dB) frequency counte
r
32 Ω
phones jack (J301)
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :playback head pinch roller
capstan rubber belt
2. Demagnetize the playback head with a head demagnetizer.
Do not use a magnetized screwdriver for the adjustments.
3. These measurement and adjustment should be performed with
the rated power supply voltage (2.5 V) 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 0.027 oz•inch)
REV 20 –42 g •cm
(FX467/FX467ST) (0.28 –0.58 oz•inch)
REV CQ-102RC less than 2 g •cm
back tension (less than 0.027 oz•inch)
(FX467/FX467ST)
FF, REW CQ-201B more than 60 g •cm
(more than 0.84 oz•inch)
RV601 : Tape speed Adjustmen
t

–7 –
TUNER SECTION
AM Section
BAND : AM
TV/FM Section
BAND : TV or FM
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
RV2 450kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts Frequency display Reading on digtal
voltmeter
Confirmation 530kHz Standard value : 3V or less
L7 1,710kHz Adjustment value : 10.0V
Standard value : 9.9-10.1V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 620kHz
CT1 1,400kHz
TV and FM FREQUENCY COVERAGE CONFIRMATION
Frequency display Reading on digtal voltmeter
Confirmation 2CH (TV) Standard value : 1.6 - 2.2V
Confirmation 108MHz (FM) Standard value : 11.0V or less
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 98MHz
Confirmation 108MHz
TV TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5 2CH
Confirmation 13CH
AdjustmentLocation: Mainboard (See page 8)
0 dB = 1µV•Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
set
32 Ω
phones jack (J301)
level meter
R205
R105
C1
C35
C310
C312
C39
C40
L4
L5
TUNER
GND
TP
(FM/TV IN)
(L)
STID
S304
S303
-2 -1
-2 -1
FM RF signal
generator
22.5kHz frequency deviation
by 400Hz signal.
Output level :
as low as possible
TP
(FM/TV IN) 0.01µF
[MAIN BOARD]
(Side B)
Frequency Coverage Adjustment
Setting:
D401
D402
C401
C403
C405
C406
R
401
R402
R403
R19
C402
C404
T401
GND
TP
(VT)
TP (VT)
TP (GND)
[MAIN BOARD]
(Side B)
digital voltmete
r
(DC range)

–8 –
AdjustmentLocation:
IC1
[MAIN BOARD] (SIDE A)
RV1 : FM VCO Adjustment
L7 : AM Frequency Coverage Adjustment
RV2 : AM IF Adjustment
L4 : FM Tracking Adjustmen
t
L5 : TV Tracking Adjustment
L3 : AM Tracking Adjustment
CT1 : AM Tracking Adjustment
FMVCO Adjustment
Procedure:
C1
C35
C310
C312
C39 C40
L4
L5
TP
(FM/TV IN)
(L)
STID
S304
S303
-2 -1
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : No modulation
Output level : 0.1V (100dB/ µV)
TP
(FM/TV IN) 0.01µF
[MAIN BOARD]
(Side B)
1. Connect the frequency counter as shown in the figure.
2. Turn the set to 98MHz.
3. Adjust RV1 for 76kHz reading frequency counter.
Standar value : 75.8 - 76.2kHz
3
C25
R4
R6
RV1
L1
L2
C4
C5
C6
C8
C11
C15
C10
8
C19
R9
R15
D2
D4
C20
C21
C26
C28
C31
C34
IC1
R
17
L6
3
7
C3
R20
40 31
35
30
21
25
20
11 15
1
5
10
frequency counter
33K Ω
1 F
IC1 7pin
IC1 0pin +
µ
[MAIN BOARD] (Side A)

– 9 – – 10 – – 12 –– 11 –
4-2. BLOCK DIAGRAM
• Signal path.
F: FM, TV
f: AM
E: PB
WM-FX277/FX467/FX467ST
Pin No. Pin name I/O Descliption
1 XOUT O Crystal oscillator output (75kHz).
2 TEST2 – Not used (Ground).
3 PA3 I Key input.
4 PA2 I Key input.
5 PA1 I Key input.
6 PA0 I Key input.
7 PB3 O Key output.
8 PB2 O Key output.
9 PB1 O Key output.
10 LOCAL/DX – Not used (OPEN).
11 HOLD I HOLD switch input. “H”: ON, “L”: OFF
12 LOCALSW – Not used (OPEN).
13 TV (H) – Not used (OPEN).
14 BAND O Band select signal output.
15 SD I Tuning signal detect input.
16 COMP I Comparator input.
17 N/R SW I N/R switch input.
18 BACK UP I Back up voltage input.
19 AMP ON O Power ON/OFF signal output.
20 BEEP O Beep signal output.
21 BATT CHECK I Back up cancel input.
22 BATT REF I A/D reference voltage input.
23 –––––––––– – Not used (Ground).
24 VSS – Ground terminal.
25 RADIO ON O Radio ON signal output.
26 MEGABASS O MEGA BASS ON signal output.
27 MUTE O Mute ON signal output.
28 TAPE I Tape ON input.
29 PRE CTL O Preamplifier control output.
30 MOTOR CTL O Motor control output.
31 ID I Destination select input.
32-44 S1-13 O LCD segment output.
45-48 COM1-4 O LCD common output.
49-52 DBR1-4 – LCD power supply.
53 RESET I Reset input (Fixed “H”).
54 TU VCC – Not used (OPEN).
55 VDD – Power supply.
56 FM IN I FM input.
57 AM IN I AM input.
58 VSS – Ground terminal.
59 E.O O Error output.
60 LPF IN I LPF input.
61 LPF OUT O LPF output.
62 LPF GND – Ground terminal.
63 TEST 1 – Not used (Ground).
64 X IN I Crystal oscillator input (75kHz).
SECTION 4
DIAGRAMS
4-1. EXPLANATION OF IC TERMINALS
IC702 LC72348W-CFX1705 SYSTEM CONTROL

S701
HOLD
ON
OFF
PRESET
+
S710
TV
S711
FM
S712
AM OFF
S708
ENTER
MEGABASS
FB101
FB201
FB301
R18
R205
R105
R11
C107 C207
C24
C29
D703
D401
D402
Q401
C401
C403
C405
C406
R401
R403
R19
C35
C311
C310
C39
R107
R207
C402
C40
JR1
JR2
C712
L4
RV301
L7
RV601
(TAPE SPEED)
C16
C9
C12
C17
C404
C303
C308
C305
C502
C104
C204
L5
T401
PB3
(R)
PW
GND
(L)
MEGA
MIX IN
MIX IN
GND
+B
TAPE
+B
PRE
GND
VREF
PA1
BASS
PB1
TUNE
COMP
PRE
CTL
TUNER GND
(R)
PA2
PWIN
(L)
MIX OUT
TP
(FM/TV IN)
PWIN
(R)
VREF
(L)
MIX OUT
PWOUT
PWOUT (R)
(L)
STID
(COM)
PWOUT
GND GND
PA3
TUNER
VCC
AMP ON
PA0
PB2
VDD
MUTE
VCC
+B
L-CH
R-CH
D1
L-CH
R-CH
HP601
PLAYBACK HEAD
BCE
AVLS
S304 S304
S303 S303
-2 -1
-2 -1
-2 -1
CrO2/METAL
NORM
LIMIT
NORM
L3
AM
FERRITE-ROD
ANTENNA
ND701
LIQUID CRYSTAL
DISPLAY PANEL
ORG
BLK
WHT
RED
WVU
COM M
M601
CAPSTAN/REEL
MOTOR
11
(11)
FX277 : 1-677-908-
FX467/467ST : 1-677-907- FX277 : 1-677-908-
FX467/467ST : 1-677-907-
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
2PCS, 3V
[MAIN BOARD] (SIDE B)
PRE
GND
L-CH
R-CH
C30
PRESET
–
LOCAL
DX
23 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20
A
1
B
C
D
E
F
G
H
L-CH
R-CH
R-CH
L-CH
FWD
REV
HP601
PLAYBACK
HEAD
[HEAD FLEXIBLE BOARD]
[HEAD FLEXIBLE BOARD]
FX277
FX467/FX467ST
02
ECB
Q701
R702
R501
Q502
R504
R503
R502
Q501
C501
C702
C704
C705
C707
C708
C709
C710
C711
R718
R720
R717
L702
R605
R606
R607
R304
R710
R106
R206
C703
1
5
10
16
17 20 25 30
32
33
35
40
45
48
49
50
55
60
64
R711
R712
R713
R714
R715
R716
IC701
C701
R704
R705
R706
R707
C309
R303
C106
C206
R701
R708
C603
R201
R202
R203
R101
R102
R103
R104
R601
R603
C101
C201
C302
C304
C105
C205 Q301
R305
C604
C605
C606
C607
R604
C306
C108
C208
CT1
C22
C301
R301
R10
R13 R14
R16
D3
Q3
C27
C25
C32 C33
R3
R4
R5
R6
R7
RV1 RV2
L1
L2
C4
C5
C6
C7
C8
C11
C13
C14
C15
C10
C18
C19
R8
R9
R15
D2
D4
C20
C21
C23
C26
C28
C31
C34
TH601
X701
IC702
IC301
IC1
L401
R17
R302
C307
R204
FB302
R722
C714
R703
R12
L6
C3
R721
C203
C103
C602
C601
R602
S301
(TAPE ON)
R20
C715
213
37
40
45
36
48
1510
13
15
20
12
1510
12
25
30
35
24
40 31
35
30
21
25
20
11 15
1
5
10
[MAIN BOARD] (SIDE A)
11
(11)
FX277
FX467/FX467ST
R202
R203
R101
R103
R104
R601
C101
C102
C201
C202
R204
C203
C103
J301
i
RV301
VOLUME
w
S709
S705
TUNING–
S702
TUNING+
TP
(VT)
S703
S706
S704
C503
BE C
BE C
S302
(N/R SW)
FX467/FX467ST
– 15 – – 16 –– 13 – – 14 –
WM-FX277/FX467/FX467ST
D1 F-2
D2 C-18
D3 D-18
D4 D-18
D401 B-6
D402 B-5
D703 B-10
IC1 C-18
IC301 E-14
IC701 E-15
IC702 D-15
Q3 D-18
Q301 F-14
Q401 B-5
Q501 C-13
Q502 B-13
Q701 B-13
Ref. No. Location
zSemiconductor
Location
4-3. PRINTED WIRING BOARDS
Note:
•X: parts extracted from the component side.
•a: Through hole.
•f: internal component.
•b: Pattern of the rear side.