Sony SRF-PSY03 Service Manual ▷ View online
– 5 –
0 dB = 1 µV
[AM]
Setting:
BAND switch: AM
BAND switch: AM
[FM]
Setting:
BAND switch: FM
BAND switch: FM
• Repeat the procedures in each adjustment several times, and
the frequency coverage and tracking adjustments should be fi-
nally done by the timmer capacitors.
nally done by the timmer capacitors.
SECTION 3
ELECTRICAL ADJUSTMENTS
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L3
520 kHz
CT1 (3/4)
1,750 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L5
600 kHz
CT1 (4/4)
1,400 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L6
86.5 MHz
CT1 (1/4)
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
86.5 MHz
CT1 (2/4)
109.5 MHz
2nd Local Frequency (57.1 MHz) Adjustment
Setting:
BAND switch: FM
BAND switch: FM
Procedure:
1. Connect the frequency counter to TP (OSC).
2. Adjust L2 for 56.75 MHz reading on the frequency counter.
1. Connect the frequency counter to TP (OSC).
2. Adjust L2 for 56.75 MHz reading on the frequency counter.
Specification values: 56.5 to 57.0 MHz
Connection:
FM STEREO (38 kHz) Adjustment
Setting:
BAND switch: FM
BAND switch: FM
Procedure:
1. Connect 10 µF Capacitor between TP (38 kHz) and TP (GND).
2. Connect the frequency counter to TP (VCO).
3. Adjust L4 for 38 kHz reading on the frequency counter.
4. Disconnect 10 µF Capacitor in step 1.
1. Connect 10 µF Capacitor between TP (38 kHz) and TP (GND).
2. Connect the frequency counter to TP (VCO).
3. Adjust L4 for 38 kHz reading on the frequency counter.
4. Disconnect 10 µF Capacitor in step 1.
Specification values: 37.95 to 38.05 kHz
Connection:
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
24
Ω
2
jack (HPJ1)
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
2
jack (HPJ1)
TP (RF IN)
set
24
Ω
0.01
µ
F
1
µ
F
50 V
TP (OSC)
+
+
–
–
frequency counter
1
µ
F
50 V
TP (VCO)
+
+
–
–
frequency counter
– 6 –
Adjsutment Location:
L5 AM Tracking Adjustment
L4 FM Stereo (38 kHz)
Adjustment
L2 2nd Local
Frequency
(57.1 MHz)
Adjustment
(57.1 MHz)
Adjustment
L3 AM Frequency
Coverage
Adjustment
Adjustment
HPJ1
L1
FM Tracking
Adjustment
Adjustment
L6 FM Frequency
Coverage Adjustment
L4
– MAIN BOARD (Component Side) –
+
TP
(RF IN)
IC1
TP
(GND)
10
µ
F
TP
(OSC)
TP
(VCO)
TP
(38 kHz)
CT1 (4/4) AM Tracking
Adjustment
CT1 (3/4) AM Frequency Coverage
Adjustment
CT1 (1/4) FM Frequency
Coverage
Adjustment
Adjustment
FM Stereo (38 kHz)
Adjustment
Adjustment
CT1 (2/4) FM Tracking
Adjustment
– MAIN BOARD (Conductor Side) –
SRF-PSY03
– 7 –
– 8 –
SECTION 4
DIAGRAMS
4-1.
BLOCK DIAGRAM
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
L5
AM FERRITE-ROD
ANTENNA
FM 2ND
OSC
L2
2ND OSC
L3
AM OSC
L1
FM RF
L6
FM OSC
FM/AM RF AMP, IF AMP,
MIX, OSC, DET, AGC, AF AMP
IC1
CT1 (1/4), L6
FM FREQUENCY
COVERAGE
CT1 (3/4), L3
AM FREQUENCY
COVERAGE
2ND LOCAL
FREQUENCY
(57.1MHz)
L4
FM STEREO
(38kHz)
CT1 (4/4), L5
AM TRACKING
CT1 (2/4), L1
FM TRACKING
CV1
TUNE
• SIGNAL PATH
: FM
: AM
05
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION R6)
1PCS. 1.5V
HPJ1
(HEADPHONE)
2
B.P.F.
BPF1
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
CT1
(1/4)
CV1
(1/4)
CT1
(4/4)
CT1
(3/4)
IN
IN
–1
–2
4
2
HEADPHONE AMP
IC2
POWER
AMP
OUT
7
POWER
AMP
OUT
9
CV1
(4/4)
CT1
(2/4)
CV1
(2/4)
CV1
(3/4)
FM SENS
S1
BAND
S2-1
LOCAL
DX
POWER
S3
OFF
ON
B+
B+
FM
AM
BAND
S2-2
VOL
RV1
B+
FM
AM
+
Click on the first or last page to see other SRF-PSY03 service manuals if exist.