Sony Walkman SRF-S84 User manual

SRF-S84
SERVICE MANUAL
FM STEREO/AM RADIO
SPECIFICATIONS
E Model
Australian Model
Chinese Model
Ver 1.0 2002.02
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-873-482-01
2002B0200-1
© 2002.02
Frequency range
FM: 87.5-108 MHz
AM: 530 -1605kHz
Output
2(stereo earphones) jack (Ø3.5mm stereo minijack) load impedance 16Ω
Power output
3.6mW + 3.6mW (at 10% harmonic distortion)
Power requirements
1.5 V DC, one R03 (rize AAA)
Dimensions
Approx.39.5 ×78.5 ×16.5 mm (w / h / d)(Approx. 19/16 × 31/8 ×21/32 inches)
not incl. projecting parts and contorols
Mass Approx.
61.2g (2.16 oz) incl. abattery and stereo earphones
Accessories supplied
stereo earphones (1)
Design and specifications are subject to change without notice

2
SRF-S84
Specifications ........................................................................... 1
1. GENERAL
Location and Function of Controls .................................... 2
2. DISASSEMBLY
2-1. Cabinet (Rear)............................................................. 3
2-2. Main Board ................................................................. 3
3. DIAL POINTER INSTALLATION ........................... 4
4. ADJUSTMENTS .......................................................... 5
5. DIAGRAMS.................................................................... 6
6. EXPLODEDVIEW.................................................. 10
7. ELECTRICAL PARTS LIST.................................... 11
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.

3
SRF-S84
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR)
2-2. MAIN BOARD
rThe equipment can be removed using the following procedure.
Cabinet (rear)
Set Main board
Cabinet (front
)
Main board
2
1
Cabinet (front)
Cabinet (rear)
4 Screw(B1.7 x 8)
1 Screw(B1.7 x 8)
2 Claw
2 Claw
3 Claws
4

4
SRF-S84 SECTION 3
DIAL POINTER INSTALLATION
Pointer
Cabinet (rear
)
2
1
Pointer
Gear (tuning cpacitor)
Cabinet (rear)
Washer
Knob (tuning)
Gear (midway)
3
4
CV1
6 Main board
Cabinet (rear)
5
1 Insert the pointer into the cabinet (rear).
2 Slide the pointer to arrow direction.
3 Install the gear (tuning capacitor), and engage with pointer as
a figure.
4 Install the gear (midway) and the knob (tuning), and fasten it
with washer.
5 Turn the CV in a direction as a figure.
6 Install the main board.
Note : Follow the installation procedure in the numerical order given.

SRF-S84
55
Procedure :
1. Connect the frequency counter to TP9 as shown the figure.
2. Turn the set to 98MHz.
3. Adjust L4 for 38kHz reading on frequency counter.
Standard Value : 37.95 –38.05kHz
FMVCO Adjustment
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 100dB µV(100mV)
TP6 (RF IN)
MAIN board
0.01 µF
TUNER SECTION
AM Section
Band : AM
Volume : MAX
FM Section
Band : FM
Volume : MAX
SECTION 4
ADJUSTMENTS
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.
FM RF signal
generator
22.5: kHz frequency deviation by
400Hz signal
Output level : as low as possible
TP6 (RF IN)
MAIN board
0.06 µF
set
16 Ω
+
–
Headphone jack (J1)
level mete
r
0dB = 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 FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT4
520kHz
1,650kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
CT3
520kHz
1,650kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
CT1
86.5MHz
109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT2
86.5MHz
109.5MHz
Connect Location :
[MAIN BOARD] (SIDE B)
Adjustment Location :
CT1 : FM Frequency Coverage Adjustment
CT4 : AM Frequency Coverage Adjustment
L3 : AM Frequency Coverage Adjustment
L6: FM Frequency Coverage Adjustment
L2: FM 2ND OSC Adjustment
L5 : AM Tracking Adjustment
CT3: AM Tracking Adjustment
L1 : FM Tracking Adjustment
L4 : FM VCO Adjustment
CT2 : FM Tracking Adjustment
MAIN BOARD (SIDE B)MAIN BOARD (SIDE A)
Procedure :
1. Connect the frequency counter to TP10 as shown the figure.
2. Turn the set to 98MHz.
3. Adjust L2 for 57.1MHz reading on frequency counter.
Standard Value : 56.85 –57.35MHz
2nd OSC Adjustment
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 100dB µV(100mV)
TP6 (RF IN)
MAIN board
0.01 µF
C12
C10
C23
R4
C7 C4
L2
L4
R3
C8
C11
R11
C18
L6
C21
1
16
20
25
30
15
IC1
Q1
C3
L3
C20
C19
S1
-2 -1
L5
AM
FERRITE-ROD
ANTENNA
C22
C9
TP8
TP9
TP10
11
(11)
1-682-982-
TP9
TP8
10 µ F
Frequency
counter
1 µ F
Connect Location :
[MAIN BOARD] (SIDE B)
C12
C10
C23
R4
C7 C4
L2
L4
R3
C8
C11
R11
C18
L6
C21
1
16
20
25
30
15
IC1
Q1
C3
L3
C20
C19
S1
-2 -1
L5
AM
FERRITE-ROD
ANTENNA
C22
C9
TP8
TP9
TP10
11
(11)
1-682-982-
TP10
10 µ F
Frequency
counter
1 µ F
TP8

SRF-S84
66
5-1. BLOCK DIAGRAMS
• Signal Path
: FM
: AM
30 11 12
16
19
L1,CT2
FM
TRACKING
27
2
23
24
14
4
L1
FM
RF
L5,CT3
AM
TRACKING
L2
FM
2ND OSC
CV1-4
TUNE BAND
L4
VCO
ON/OFF
L4
VCC
L6,CT1
FM
FREQUENCY
COVERAGE
L6
FM
OSC
L3,CT4
AM
FREQUENCY
COVERAGE
L5
AM
FERRITED-ROD
ANTENNA L5
AM
RF
L3
AM
OSC
L2
FM
2ND
VCC
RIPPLE
FILTER
Q1
S2-2
MIX
2
MIX
1
17
2
1
13
14
9
7
2
4
11
5
10
1
6
6
MUTE SW
POWER SW
7
FM/AM
P02 FM IF
S1
FM ST
FM MONO
AM
S2
POWER
MEGA BASS
ON
OFF
CT2 CV1
CT1 CV2
CT3 CV3
CT4 CV4
IC1
FM/AM FRONT-END,IF AMP,MPX
IC2
MEGA BASS AMP
IC3
HEADPHONE AMP
i
J1
S2
POWER
MEGA BASS
ON
OFF
DRY BATTERY
SIZE "AAA"
(IEC DESIGNATION R03)
1PC,1.5V
VCC
S1-2 S1-1
FM RF IN
FM RF
AM IN
FM/AM
AM OSC
FM 1ST OSC
FM 2ND
LOCAL
0, π
_ 2
L-CH IN 2
IN 1
IN 1
IN 2
OUT 1
MUTE
POWER
VCC
OUT 2
LP IN
R-CH
DET
OUT
MPX
IN
PLL VCO
S2-1
LP GAIN
OUT 2
OUT 1
DET
IN
RV1
VOLUME
w
LOCAL
OSC
AM RF
AMP
AM BPF
IF AMP
DET
FM RF
AMP
FM LPF
LIMITER
AMP
DISCRI
VCO,
MPX
AM RF
AMP
FM 1ST
OSC
FM
MIX
FM/AM
SELECT
SECTION 5
DIAGRAMS

SRF-S84
77
RV1
VOLUME w
23 4 5 6 7 8 9
A
1
B
C
D
E
F
G
H
R6
R7
R10
R15
C42
C2
L11
C16
C13
C40 C44
C12
C10
C23
R4
C7 C4
L2
L4
R3
C26
C28
R16
C33
C25
C34
C24
C5
C14
C41
C35
C8
C11
R11
C18
L6
L1
R1
C21
C36
R2
C6
C27
C1
R9
R8
157
14108
-2
-1
IC2
15
106
IC3
1
16
20
25
30
15
IC1
C29
C31
C30
C38
C32
C37
C39
C43
Q1
C3
L3
C17
C20
C19
S1
-2 -1
-2 -1
-2
-1
L5
AM
FERRITE-ROD
ANTENNA
C22
C9
L9
L7
L8
L10
CT4
CT3
CV3
CV4
CT2
CT1
CV1 CV2
J1
i
S2
(POWER)
MEGABASS
t
ON
t
OFF
S1
BAND
FM ST
r
FM MONO
r
AM
MAIN BOARD (SIDE A) MAIN BOARD (SIDE B)
TP3
TP5
TP6
TP7
TP8
TP9
TP10
TP4
TP1
TP2
CV1-4
TUNE
DRY BATTERY
SIZE "AAA"
(IEC DESIGNATION R03)
1PC, 1.5V
11
(11)
1-682-982-
11
(11)
1-682-982-
5-2. PRINTED WIRING BOARDS
Ref. No. Location
rSemiconductor
Location
IC1 E-6
IC2 B-6
IC3 D-7
Q1 E-7
Note:
•X: parts extracted from the component side.
•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 the
(Side B) pattern face are indicated.
Parts face side : Parts on the parts face side seen from the
(Side A) parts face are indicated.

SRF-S84
88
CT1
CT2
CT3
CV1
CV2
CV3
C1
C3
C4
L2
C5
CT4
CV4
C6
C7
C8
C9
C10 C11
C24
C25
C26 C27 C28
R6
R7
C29
R8
C35 C36
C37
L7
1µH
1µH
1µH
L9
C38
C39
C40
C41 C42
L1
L10
1µH
C13
C14
R2
C17
C18
L6
R3
C19 C20 C21
C22
R4 C33
C34
R15
R16
C30 C31
C32
C43
C44
R11
Q1
L11
20µH
L3
R10 R9
C23
C12
J1
L8
R1
C16
L4
L5
C2
18p
4.7
16V 100p
3p
1500p
1
0.22
5600p
0.22 0.015
0.47
0.47
0.047 1000p 0.1
150k
150k
1
50V
4.7k
0.1 0.1
100
4V
100
4V
220
4V
0.1
100p 100p
1
2p
1k
100
4V
1
6.8
2.2
35V
4.7
16V 1
10
6.3V
68k 0.47
0.47
0
0
1
50V 10
6.3V
100
4V
22
6.3V
0.1
1k
2SB1218A
100k 100k
1
0.015
220
120p
18p
FM/AM FRONT-END
IF DET,FM MPX
FM IF
MUTE
DET OUT
MPX IN
PD1
PD2
ST IND
AGC
GND
+VCC
FM RF
OL AGC
AM OSC
TUN IND
PLL1
PLL2
VCO CONT
R OUT
L OUT
TV 1ST OSC
FM 1ST OSC
AGC AFC
AM RF IN
FE GND FM RF IN
TV RF IN
+VCC FE
IMAGE ADJ
FM 2ND LOCAL
PLL VCO
MUTE
SWITCH
OUT 1
POWER
GND
OUT 2
VCC
POWER
SWITCH
IN 1
IN 2
REF
REF GND
POWER AMP
IC3
IC1
VCC
GND
IN 1
IN 2
HP 1
HP 2
LP IN
LP GAIN
LP OUT
OUT 1
OUT 2
DET IN
DET IN
IC2
MEGA BASS
AMP
REG
FM ST
FM MONO
AM
S1
BAND
S1-1
S1-2
S2-2
ON
POWER
MEGABASS
OFF
S2
S2-1
FM
TRACKING
TRACKING
AM
FREQUENCY
COVERAGE
FM
AM
FREQUENCY
COVERAGE
FM
2ND OSC
VCO
L4
TUNE
CV1-4 CT3,L5
CT1,L6
CT4,L3
L2
CT2,L1
RV1
DRY BATTERY
REF
CXA1129N-T4
LA3550M-TE-L
LA4535M-TE-L
VOLUME
(IEC DESIGNATION R03)
1PC 1.5V
SIZE"AAA"
5-3. SCHEMATIC DIAGRAM
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 1/4 W or less unless otherwisespecifed.
•A : B+ Line.
•H: adjustment for repair.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages are dc with respect to ground under no-signal (detuned)
conditions.
no mark : FM
( ) : AM
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Signal path.
F: FM
f: AM

SRF-S84
9
rIC BLOCK DIAGRAMS
IC1 CXA1129N-T4
IC2 LA3550M-TE-L
12 6 8
FM/TV
RF AMP
FM/TV
MIX
FM/TV
1ST LOCAL
OSC
AFC
AM
RF AMP
OVER LOAD
AGC
MIX
1
MIX
2
PSN
1
PSN
2
AGC
AF AMP
LPF
DETUNE
DET
FM
LPF
AM
BPF
LOCAL
OSC
1/2
COUNTER
FM/TV
SELECT
FM
DISCRI
FM
LIMITTER
AMP
AM IF AMP
(FM TUN IND)
AM
DET
AGC
TUNING
IND
VCO
MUTE
SEP
CONTROL
ST.
DECORDER
INPUT
BUFF
VCO
LEVEL
CONTROL
BUFF
AMP
DC
AMP
PD
SYNC
DET
R CH
AMP
L CH
AMP
LOAD
SELECT
1/2
COUNTER
FM/AM
SELECT
M/ST.SW
ST.IND
FM/TV
30 29 25 24 232628 27 22 20
345 7 9 10 11 12 13 14 15
1617181921
FM/AM
FM/TV 38KHz
0
π/2
FM/TV
FM/AM
19KHz
π/2
19KHz
0
38KHz
FM IN TV IN NC FM RF GAIN ADJ OL AGC 2ND OSC AM OSC TUN IND PLL1 PLL2 VCO OSC VCO CONT R OUT L OUT
ST IND
PD2 PD1
MPX IN
DET OUT
MUTE
AGC2
NC
FM IF
NC
TV OSC
FM OSC
AGC1
AM IN
NC
1
2
3
4
5
10
9
8
7
6
POWER
SWITCH
BIAS
MUTE
SWITCH
POWER
SWITCH
IN-1
PRE-GND
IN-2
REF
MUTE
SWITCH
OUT-1
POWER GND
OUT-2
VCC
AMP1
AMP2
1
2
3
4
5
6
7
14
13
12
11
10
9
ON/OFF 8
IN1
IN2
HP1
HP2
LP-IN
LP-GAIN
LP-OUT
OUT1
OUT2
DET-IN
DET-OUT
REF
VCC
GND
IC3 LA4535M-TE-L

SRF-S84
10
SECTION 6
EXPLODEDVIEW
NOTE :
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
• Items marked “ * ”are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference
number in the exploded views are not
supplied.
• Accessories and packing materials are given
in the last of this parts list.
16
17
15
14
13
7
6
5
3
4
21
20
19
18
19
9
10
11
12
8
1 3-236-173-01 LID, BATTERY CASE
2 3-236-180-01 TERMINAL (+), BATTERY
*3 A-3021-741-A MAIN BOARD, COMPLETE
4 3-236-181-01 TERMINAL (-), BATTERY
5 3-238-306-01 WASHER
6 3-919-915-02 KNOB (TUNING)
7 3-919-918-01 GEAR (MIDWAY)
8 3-919-919-01 GEAR (TUNING CAPACITOR)
9 3-236-177-01 KNOB (BAND)
10 3-919-920-02 ADAPTOR
11 3-880-990-00 SCREW (1.7X3),FLAT,(+) SPECIAL
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
• Abbreviation
AUS : Australian
CH : Chinese
TW : Taiwan
• Color Indication ofAppearance Parts Example:
KNOB, BALANCE (WHITE) . . . . (RED)
XX
Parts color Cabinets color
12 3-236-175-01 POINTER
13 3-236-171-01 CABINET (FRONT)
14 3-236-176-01 KNOB (POWER)
15 3-236-178-01 PLATE, TRANSPARENT
16 3-236-179-01 EMBLEM (NO.3), SONY
17 3-236-174-21 PANEL, FRONT...(BLUE)
17 3-236-174-41 PANEL, FRONT...(GOLD)
18 3-236-172-11 CABINET (REAR) (AUS,CH,TW)
18 3-236-172-21 CABINET (REAR) (E)
19 3-318-203-31 SCREW (B1.7X8), TAPPING
20 3-918-543-11 CLIP