Sony SRF-S84 (serv.man2) Service Manual ▷ View online
3
SRF-S84
SECTION 2
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR)
2-2. MAIN BOARD
r
The 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.
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 CV1 in a direction as a figure.
6 Install the main board.
6 Install the main board.
Note :
Follow the installation procedure in the numerical order given.
SRF-S84
5
5
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.
2. Turn the set to 98MHz.
3. Adjust L4 for 38kHz reading on frequency counter.
Standard Value : 37.95 –38.05kHz
FM VCO Adjustment
FM RF signal
generator
generator
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 100dB
Modulation : no modulation
Output level : 100dB
µV(100mV)
TP6 (RF IN)
MAIN board
MAIN board
0.01
µF
TUNER SECTION
AM Section
Band : AM
Volume : MAX
Volume : MAX
FM Section
Band : FM
Volume : MAX
Volume : MAX
SECTION 4
ADJUSTMENTS
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
FM RF signal
generator
generator
22.5: kHz frequency deviation by
400Hz signal
Output level : as low as possible
400Hz signal
Output level : as low as possible
TP6 (RF IN)
MAIN board
MAIN board
0.06
µF
set
16
Ω
+
–
–
Headphone jack (J1)
level meter
0dB = 1
µV
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
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 <75MHz>
109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT2
86.5MHz <75MHz>
109.5MHz
Connect Location :
[MAIN BOARD] (SIDE B)
[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.
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
generator
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 100dB
Modulation : no modulation
Output level : 100dB
µV(100mV)
TP6 (RF IN)
MAIN board
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
µF
Frequency
counter
counter
1
µ
F
Connect Location :
[MAIN BOARD] (SIDE B)
[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
µF
Frequency
counter
counter
1
µ
F
TP8
Ver 1.1
< > : Tourist model
SRF-S84
6
6
5-1. BLOCK DIAGRAMS
• Signal Path
: FM
: AM
: 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
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
