Sony SRF-S84 (serv.man2) Service Manual ▷ View online
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
2-2. Main Board ................................................................. 3
3. DIAL POINTER INSTALLATION
........................... 4
4. ADJUSTMENTS
.......................................................... 5
5. DIAGRAMS
.................................................................... 6
6. EXPLODED VIEW
.................................................. 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-
• 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.
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
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
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