Sony SRF-S54 / SRF-S56 (serv.man2) Service Manual ▷ View online
SRF-S54/S56
5
2-3.
MAIN BOARD
shaft
(tuning capacitor)
(tuning capacitor)
hole
(gear (tuning capacitor))
(gear (tuning capacitor))
1
3
main board
2
claw
SRF-S54/S56
6
3
knob (tune)
4
washer
2
gear (tuning capacitor)
gear
(tuning capacitor)
(tuning capacitor)
hole
1
pointer
pointer
pointer
SECTION 3
ASSEMBLY
Note:
Follow the assembly procedure in the numerical order given.
3-1.
HOW TO INSTALL GEAR (TUNING CAPACITOR)
•
POSITION OF GEAR (TUNING CAPACITOR) and POINTER
SRF-S54/S56
7
7
TP5
(VCO)
TP1
(RF IN)
TP4
(OSC)
IC1
– MAIN BOARD (Conductor Side) –
L3
FM Stereo (38 kHz)
Adjustment
FM Stereo (38 kHz)
Adjustment
L2
2ND Local
Frequency
(57.1 MHz)
Adjustment
2ND Local
Frequency
(57.1 MHz)
Adjustment
L4
FM Frequency
CT2
}
Coverage
Adjustment
Adjustment
L1
FM Tracking
CT1
}
Adjustment
– MAIN BOARD (Component Side) –
SECTION 4
ELECTRICAL ADJUSTMENTS
0 dB = 1
µ
V
[FM]
Setting:
STEREO/MONO switch: ST
STEREO/MONO switch: ST
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the timmer capacitors.
done by the timmer capacitors.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
86.5 MHz
CT2
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
86.5 MHz
CT1
109.5 MHz
2ND LOCAL FREQUENCY (57.1 MHz) ADJUSTMENT
Setting:
STEREO/MONO switch: ST
STEREO/MONO switch: ST
Procedure:
1. Connect the frequency counter to TP4 (OSC).
2. Adjust L2 for 57.1 MHz reading on the frequency counter.
1. Connect the frequency counter to TP4 (OSC).
2. Adjust L2 for 57.1 MHz reading on the frequency counter.
Specification values: 56.85 to 57.35 MHz
Connection:
FM STEREO (38 kHz) ADJUSTMENT
Setting:
STEREO/MONO switch: ST
STEREO/MONO switch: ST
Procedure:
1. Connect the frequency counter to TP5 (VCO).
2. Adjust L3 for 38 kHz reading on the frequency counter.
1. Connect the frequency counter to TP5 (VCO).
2. Adjust L3 for 38 kHz reading on the frequency counter.
Specification values: 37.95 to 38.05 kHz
Connection:
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
i
jack (J1)
TP1 (RF IN)
set
16
Ω
0.01
µ
F
1
µ
F
50 V
TP4 (OSC)
+
+
–
–
frequency counter
1
µ
F
50 V
TP5 (VCO)
+
+
–
–
frequency counter
Adjustment and Connecting Location:
SRF-S54/S56
8
8
11
23
24
TV/FM
RF AMP
AM
RF AMP
TV/FM
MIX
1st
LOCAL
OSC
1/2
COUNTER
2nd
LOCAL OSC
12
FM RF
IN
IN
TV RF
IN
IN
DET
OUT
MPX
IN
IN
AM OSC
27
FM RF
FM 2ND
OSC
L2
2ND OSC
L1
FM RF
L4
FM OSC
FM RF AMP, IF AMP,
MIX, OSC, DET, AF AMP
IC1
CT2, L4
FM FREQUENCY
COVERAGE
L3
FM STEREO
(38kHz)
CT1, L1
FM TRACKING
CV1
TUNE
• SIGNAL PATH
: FM
FM/AM
MIX
1
MIX
2
PSN
1
FM
L.P.F.
FM LIMITER
AMP
FM
DISCRI
STEREO
DECODER
PD
SYNC
DET
DC
AMP
VCO
MONO/STEREO,
STEREO
INDICATOR
FM/AM
SELECT
TV/FM
SELECT
BUFFER
1/2
COUNTER
SEP.
CONTROL
AMP
AF
AMP
DETUNE
DET
TUNING
INDICATOR
AM
L.P.F.
AM IF
AMP
AM
DET
PSN
2
LOUT
ROUT
TV/FM
FM/AM
TV/FM
TV/FM
TUN IND
0°
π
/2
19kHz 0°
38kHz
B+
19kHz π/2
16
17
ST IND
15
PLL
VCO
19
22
FM IF
7
PD2
14
PD1
13
PLL2
20
PLL1
21
2
30
29
TV OSC
5
FM OSC
AM RF IN
4
CT2
CV1
(2/2)
IN1
IN2
–2
–1
4
2
HEADPHONE AMP
IC3
POWER
AMP
OUT1
7
POWER
AMP
OUT2
9
CT1
CV1
(1/2)
BASS
BOOST
CONTROL
DET
BASS BOOST AMP
IC2
2
1
14
14
IN2
IN1
OUT2
OUT1
LP
GAIN
GAIN
6
DET
IN
12
J1
S2
(STEREO/MONO)
ST
MONO
B.P.F.
-1
-2
FM TUNER (IC1),
BASS BOOST AMP (IC2) B+
RIPPLE FILER
Q1
B+
DRY BATTERY
SIZE "AAA"
(IEC DESIGNATION R03)
1PC. 1.5V
S1
(POWER, MEGABASS)
MEGABASS
ON
OFF
RV1
VOLUME
2ND LOCAL
FREQENCY
(57.1MHz)
SECTION 5
DIAGRAMS
5-1.
BLOCK DIAGRAM
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