Sony Walkman WM-FX571 User manual

– 1 –
Model Name Using Similar Mechanism WM-FX551/FX553
Tape Transport Mechanism Type MF-WMFX551-125
SERVICE MANUAL
Tourist Model
WM-FX571
RADIO CASSETTE PLAYER
Ver 1.0 1999. 03
SPECIFICATIONS
Radio section
Frequency range
FM : 87.5 – 108 MHz
AM: 531 – 1,602 kHz
Tape section
Frequency response
(Dolby NR off)
Playback : 20 – 18,000 Hz
Output
Headphones (2REMOTE jack)
Load impedance 8 – 300 Ω
General
Power requirements
1.5 V
One R6 (size AA) battery
Rechargeable battery
Dimensions (w/h/d)
Approx. 109 ×79.2 ×29.4 mm
(4 3/8 ×3 1/8 ×1 3/16 inches) incl.
projecting parts and controls
Mass
Approx. 150 g (5.3 oz)
Approx. 210 g (7.5 oz) incl.
a battery and a cassette
Supplied accessories
Stereo earphones with remote
control MDR-WMF653 (1)
Battery charger BC-820T (1)
AC plug adaptor (1)
Rechargeable battery (NC-AA) (1)
Battery R6P (SR) (1)
Carrying pouch (1)
Design and specifications are subject to
charge without notice.
Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY” and the double-D symbol aare trademarks
of Dolby Laboratories Licensing Corporation.
MICROFILM

– 2 –
TABLE OF CONTENTS
1. GENERAL ....................................................................3
2. SERVICE NOTE ..........................................................3
3. DISASSEMBLY
3-1. Case Assy ............................................................................ 4
3-2. Tuner Board ........................................................................ 4
3-3. Audio Board ........................................................................ 5
3-4. Cassette Lid Assy ................................................................ 5
3-5. Tape Mechanism Deck ........................................................ 6
4. MECHANICAL ADJUSTMENTS ..............................7
5. ELECTRICAL ADJUSTMENTS
Tape Section ............................................................................ 7
Tuner Section........................................................................... 8
6. DIAGRAMS
6-1. Block Diagram .................................................................... 9
6-2. IC Pin Description............................................................. 11
6-3. Printed Wiring Boards –Tuner Section– ........................... 13
6-4. Schematic Diagram –Tuner Section–................................ 17
6-5. Schematic Diagram –Audio Section– ............................... 20
6-6. Printed Wiring Board –Audio Section– ............................ 23
7. EXPLODED VIEWS
7-1. Cabinet Section ................................................................. 29
7-2. Audio and Tuner Board Section ........................................ 30
7-3. Tape Mechanism Section .................................................. 31
8. ELECTRICAL PARTS LIST ....................................32
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.

– 3 –
screw
(M1.4 × 5.0) screw (M1.4
× 5.0)
TUNER board
screw (M1.7
× 4.0
)
screw
(M1.4 × 5.0)
JIG
AUDIO board
0!¡
!™
!£
!¢
!∞
!§
!¶
9
8
7
6
5
4
3
2
1
SECTION 1
GENERAL
• LOCATION OF CONTROLS
SECTION 2
SERVICE NOTE
• Regarding the method of adjustment and voltage check, perform sections 3-1 and 3-2 of the DISASSEMBLY, and attach the JIG (extension
cable) to the AUDIO board as shown below.
JIG Part No.: J-2503-005-A
1OPEN knob
2Display window
3PRESET + /AMS FF (Fast Forward) button
4TUNING + button
5TUNING – button
6ENTER button
7PRESET – /AMS REW (Rewind) button
8MENU button
9RADIO ON/BAND button
!º SET button
!¡ p/RADIO OFF button
!™ “” /REPEAT button
!£ VOLUME control
!¢ CHOLD knob
!∞ 2REMOTE jack
!§ Battery case
!¶ DC IN 1.5V jack

– 4 –
1 screw (M1.7 × 6)
5 TUNER board
4
3
screw
(M1.4
× 4.5)
7 guide (TU)
6
2 screw (M1.7 × 3)
1 screw (M1.7 × 6
)
6 case assy
4 claws
3 screws
(M1.4
× 2.2)
1 screw
(M1.4
× 2.2)
2 screw
(M1.4
× 3.0)
5
CASE ASSY TUNER BOARD AUDIO BOARD
CASSETTE LID ASSY TAPE MECHANISM DECK
SET
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CASE ASSY
3-2. TUNER BOARD
Note : Disassemble the unit in the order as shown below.

– 5 –
2 screw (M1.4 × 2)
5 cassette lid assy
3 screw (M1.4 × 1.6
)
1 OPEN button
4
7 AUDIO board
1 Unsolder the 3 places.
2 battery terminal (–)
4 battery terminal (+)
3 Unsolder the 5 places.
5 Flexible board
6
3-3. AUDIO BOARD
3-4. CASSETTE LID ASSY

– 6 –
2
1
3
4 reel ornament
5 tape mechanism deck
3-5.TAPE MECHANISM DECK

– 7 –
PRECAUTION
1. Specified voltage : 1.3V
2. Switch position
MENU button : aNR light off (OFF)
: AVLS light off (OFF)
TAPE SECTION 0 dB=0.775V
TestTape
Tape Speed Adjustment
Procedure :
1. Playback WS-48A (Tape center part) in the FWD state and
adjust RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Value:
Digital frequency counter
2,970 to 3,030 Hz
2. Playback WS-48A (Tape center part) in the REV state.
Check that frequency counter reading is within 60 Hz of the
reading of step1.
Adjustment Location :
[MAIN BOARD] — SIDE A —
Torque meter
CQ-102C
CQ-102RC
CQ-201B
Mode
FWD
FWD
Back Tension
REV
REV
Back Tension
FF
REW
Test tape
WS-48A
(3kHz, 0dB)
set
16
Ω
2
REMOTE jack (J701)
+
–
Frequency counter
RV601 :Tape speed
SECTION 4
MECHANICAL ADJUSTMENTS
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 (1.3V) to
perform the adjustments.
Torque Measurement Meter reading
20 to 30 g · cm
(0.28 to 0.42 oz · inch)
0.4 to 2.0 g · cm
(0.0056 to 0.028 oz · inch)
20 to 30 g · cm
(0.28 to 0.42 oz · inch)
0.4 to 2.0 g · cm
(0.0056 to 0.028 oz · inch)
More than 40 g · cm
(More than 0.56 oz · inch)
Type
WS-48A Signal 3kHz, 0dB Purpose Tape Speed Adjustment
SECTION 5
ELECTRICAL ADJUSTMENTS

– 8 –
FMVCO Adjustment
Procedure :
1. Connect the frequency counter to the positions shown below.
2. Turn the set to 98 MHz.
3. Adjust RV1 for 19,000 Hz reading on the frequency counter.
Specification Value:
Digital frequency counter
18,900 to 19,100 Hz
TUNER SECTION 0 dB=1 µV
[AM]
RADIO ON/BAND button : AM
[FM]
RADIO ON/BAND button : FM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AMTRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 621kHz
CT1 1,395kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 10.7MHz
FMVOLTAGE ADJUSTMENT
1.05 to 1.15 V
L2 76MHz
L3 : FM IF Adjustment
TP1
TP13
IC7
L2 : FM
Voltage Adjustment
RV1 : FM VCO Adjustment
L4 : AM
Tracking
Adjustment
CT1 : AM
Tracking
Adjustmen
t
100 Ω
+
–
Frequency counte
r
1 µ F
TP23
(IC7 pin
!™ )
IC7 pin
9
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : No moduration
Output level : 0.1V (100dB)
0.01 µ Fto ANT (TP1
)
set
16
Ω
2
REMOTE jack (J701)
+
–
FM RF signal
generator
22.5kHz frequency
deviation by 400Hz signal.
Output level : as low as possible
0.01 µ Fto ANT (TP1
)
Level meter
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.
Adjustment Location :
[TUNER BOARD] — SIDE A —

Pin No.
1 to 3
4 to 25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
I/O
—
—
O
O
O
O
O
O
O
I
I
I
I
I
O
I
O
I
I
I
I
O
O
I/O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
—
I
O
O
I
O
—
Description
Common terminal.
Segment output terminal.
Remote control data output.
DDC control terminal (when DDC ON = L).
BAND control output (when AM = Hi-imp, when FM = L).
MUTE control terminal (when MUTE ON = L).
HEAD select terminal (when FWD = Hi-imp, when REV = L).
Tone control terminal (when BOOST ON = Hi-imp, when OFF = L).
IF REQ control terminal (when REQ = Hi-imp).
HOLDER detect input (when HOLDER CLOSE = H).
Communication request from the remote controller. (H =VCC).
HOLDER detect and TAPE error erase detect terminal.
TAPE rotating direction detect terminal.
Input when the key is pressed during HOLD (H = ADVref).
Terminal for controlling the rotation detect circuit.
Rotation detect input.
AMS sensitivity select (when AMS = H, when BL.SKIP = L).
Tape sound existing or not-exiting detect (Music
exists: L, music does not exist: H.
Voltage detect input.
KEY input terminal.
Reference voltage of AD IN 1, 2.
LED output terminal.
E2PROM CS control terminal.
E2PROM DATA I/O.
E2PROM CLOCK terminal.
BEEP (when TC : 1.6 kHz, when CF : 3.0 kHz).
MOTOR control terminal.
MOTOR control terminal.
MOTOR control terminal.
REC circuit control output.
RADIO system control terminal (when RADIO ON = L).
Terminal for controllingAVLS (when ON = L).
AMP control output (when AMP ON = H).
Tone control terminal (when GRV = L, when MB = H).
PL control terminal.
TC/CF select output (when PRE OFF = H, when PRE ON = Hi-imp).
Terminal for controlling DOLBY circuit
(when OFF = H, when ON = Hi-imp).
DDC control terminal (ON at Hi-imp, OFF at L).
TUNER MONO/STEREO select terminal (MONO at H).
TEST terminal (Normal operation at L or NC).
IF input.
TUNER sensitivity select terminal (LOCAL at H, DX at L).
Phase comparator output.
External interrupt terminal.
Pre-scaler output (FM at H).
Power supply GND terminal.
Function
COM 1 to 3
S1 to 22
R DATA OUT
DDC1 CTL
BAND AM/FM
MUTE CTL
F/R CTL
BST CTL
IF REQ
HOLD SW
R DATA IN
HOLDER, TUME
F/R SW
HOLD SENS
PHOTO CTL
PHOTO IN
AMS CTL
AMS IN
BATT DET
KEY IN
AD Vref
LED CTL
CS
M DATA I/O
M CLOCK
BEEP
MOTOR CTL
MOTOR DIR
MOTOR BRK
REC CTL
RADIO CTL
AVLS CTL
AMP CTL
GRV/MB CTL
PM CTL
PRE AMP CTL
DOLBY CTL
DDC2 CTL
MONO/ST
TEST
IF IN
LOCAL/DX
DO
HOLD
PSC
GND
Circuit
Output
Output (Nch)
Output (Nch)
Output (Nch)
Output (Nch)
Output (Nch)
Output (Nch)
Input
Input
Input
Input
Input
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Ternary output
Ternary output
Ternary output
Ternary output
Output
Output
External interrupt
Remarks
VLD at High level.
Pull-up at outside
(TUNER side).
Pull-up at outside (Vref).
Pull-up at outside (Vcc).
Pull-up at outside (Vcc).
Pull-up at outside (Vcc).
Pull-up at outside (Vref).
Pull-up at outside (V LCD ).
A/D input.
A/D input.
A/D input.
A/D input.
Pull-down at outside.
Pull-up at outside.
Open
Pin Name
COM 1 to 3
S1 to 22
P13-1
P13-2
P13-3
P14-0
P14-1
P14-2
P14-3
IN2
K0
K1
K2
K3
P1-1
P1-2
P1-3
P2-0/AD IN1
P2-1/AD IN2
P2-2
P2-3
P3-0
P3-1
P3-2
P3-3/BUZR
P4-0
P4-1
P4-1
P4-2
P4-3
P5-0
P5-1
P5-2
P5-3
P6-0
P6-1
P6-2
P6-3
MUTE
TEST
IF IN
DO1/OT
DO2
HOLD
PSC
GND
INT
—
—
H
Hi-imp
Hi-imp
Hi-imp
Hi-imp
L
Hi-imp
—
L
—
—
L
L
—
L
—
—
H
—
L
L
L
L
—
L
L
L
L
H
L
L
L
L
Hi-imp
Hi-imp
Hi-imp
L
—
—
L
—
H
—
—
ACT
—
—
—
L
—
L
—
Hi-imp
L
—
VCC
—
—
AD Vrcl
H
—
H
—
—
—
—
H
—
—
—
—
H
H
H
H
L
L
H
H
H
Hi-imp
Hi-imp
Hi-imp
—
—
—
—
—
—
H
—
Pin No.
70
71
72
73
74
75
76
77
78
79
80
I/O
I
O
—
I
O
I
—
—
—
—
—
Description
Pre-scaler input.
AM local oscillator output.
Power supply voltage.
RESET terminal (H during operation).
Terminal to which external oscillator is connected.
Terminal to which external oscillator is connected.
Terminal to which external capacitor is connected
to stabilize crystal oscillator power supply.
Terminal to step-up power supply voltage for LCD drive.
Terminal to step-up power supply voltage for LCD drive.
Terminal to step-up power supply voltage for LCD drive.
Terminal for 1.5V constant voltage power supply of LCD drive.
Function
FM IN
AM IN
VDD
RESET
XOUT
XIN
VXT
VLCD
C1
C2
VEE
Circuit RemarksPin Name
FM IN
AM IN
VDD
RESET
XOUT
XIN
VXT
VLCD
C1
C2
VEE
INT
—
—
—
L
—
—
—
—
—
—
—
ACT
—
—
—
H
—
—
—
—
—
—
—
• IC1TC9326F-051 (SYSTEM CONTROL)
6-2. IC PIN DESCRIPTION
– 12 –– 9 – – 10 – – 11 –
WM-FX571
6-1. BLOCK DIAGRAM
SECTION 6
DIAGRAMS
FUNCTION
KEY
S701
FM/AM RF,IFAMP
IC7
VCC1
T2
AM MIX
CF2
10.7MHz
CF3
450kHz
450kHz
MIX OUT
4
FM IF IN
3
AM IF IN
6
AM OSC
L.P.F
Q16,17
CT1, L4
CT1
AM
TRACKING
L OUT 14
R OUT 15 R CH FWD
HP301
PB HEAD REV
L
L
R CH
GND
REMO
DATA
VCC
L CH
S1-5,7-11
ON
OFF HOLD
DDC
CONT
S702
(F/R)
RADIO +B
SWITCH
Q18
SYSTEM CONTROL
IC1
2 5
MOTOR BRK
52
PH701
BRAKE
SWITCH
Q601,602
SPEED
TAPE
RV601
START 8
DIR 6
IN 10
MOTOR SERVO
IC601
U
19
V
1
W
3
425
X IN
75
X OUT
74
X701
75kHz
13
COM1 COM3 S1 S22
04
LIQUID CRYSTAL
DISPLAY PANEL
REMOTE
J701
: FM
• Signal Path
• R-CH is omitted.
: PB
: AM
FM
LOCAL/DX
Q1
RF IN
16
MIX
5
OSC
8
RF OUT
FM FRONT END
IC3
D2
D1
FM IF
AMP
Q4
FM
VOLTAGE
L2
L2
FM IF
L1
L1 CF1
10.7MHz FM IF
AMP
Q6
FM IN
25
FM OUT
PRESCALER
IC2
PSC
7
L4
AM
FERRITE-ROD
ANTENNA
AM RF
24
AM
LOCAL/DX
Q2
Q7
RF
AMP
T1
AM OSC
2
IF REQ
SWITCH
Q15
D3
D4
IF REQ
11
7
QUAD
17
VCO
FM VCO
RV1
CF4
10.7MHz
18
LP2A
19
LP2B BAND
SELECT
Q5
5
VCC
Q8
Q304 VCC1
RADIO +B
SWITCH
Q7
VCC22.8V
16
LPF1
Q8
Q14
10
IF OUT
Q13
FWD
34
18
REV
33
F/R SW
26 NR SW
19 BST SW
62
16
47
BST IN
Q301
(2/2)
25
DET
Q301
(1/2)
PWR
AVLS
CONT
Q302
Q303
BEEP
60 MUTE SW
59 PW SW
58
AVLS
64
3
24
AMS
22
PRE SW
57
63
56
50
AVLS
PW C
AGC
AUDIO
POWER AMP
IC301
GND
COM
VCC1
S901
(ATS)
PLUNGER
DRIVE
Q701,702
PM901
PLUNGER
S703
(HOLDER)
65
LOCAL/DX
36
F/R SW
66
DO
68
PSC
70
FM IN
32
IF REQ
64
IF IN
71
AM IN
62
MONO/ST
54
RADIO CTL
30
F/R CTL
BST IN
DET
28
BAND AM/FM
60
DOLBY CTL
31
BST CTL
33
AMS IN
57
MB/GRV CTL
40
AMS CTL
55
AVLS CTL
56
AMP CTL
29
MUTE
49
BEEP
59
PRE AMP CTL
26
R DATAOUT
43
KEY IN
58
PW CTL
67
WAKE UP
37
HOLD SENS
41
HOLD SW
35
HOLDER SW
34
R DATAIN
Q21
IC6
M CS
46
DC-DC
CONV.
T3,Q9-11
REG
IC5
2 3
1
IC701
VCC1
VCC2
DDC2 CTL
61
(VCC) AD REF
44
DDC1 CTL
27
EEPROM
IC4
3421
M DATAI/O
47
M CLOCK
48
PH701
VCC2
Q704
PHOTO CTL
38
PHOTO IN
39
LED CTL
45
D5
BATT
MOTOR CTL
50
MOTOR DIR
51
LCD1
Q306
PW VCC
53 BASS
52 RF OUT
51
J801
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
1PC, 1.5V
DC IN 1.5V
M901
CAPSTAN/
REEL
MOTOR
FWD
STOP
REV
RV301
VOLUME

– 13 – – 14 – – 15 –
WM-FX571
– 16 –
6-3. PRINTEDWIRING BOARD — TUNER SECTION —