Sony SRF-M55 - Section 3 Adjustments; FM IF Adjustment; FM Frequency Coverage Adjustment; FM Tracking Adjustment

– 5 –
FM STEREO (19kHz) Adjustment
Setting :
Procedure :
1. Connect the frequency counter to TP (19kHz).
2. Turn the set to 98MHz.
3. Adjust RV1 for 19kHz reading frequency counter.
Standard Value : 18.9 –19.1kHz
Connection:
SECTION 3
ADJUSTMENTS
FM Section
Setting :
Connection:
For FM frequency coverage adjustment
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1 10.7MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
CT2 87.5MHz
adjustment value: 2V
standard value: 1.5 – 2.5V
Confirm 108.0MHz standard value: 9 – 13V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
CT1 98MHz
FM RF signal
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
TP (ANT)
0.01
µ F
set
16
Ω
headphones jack EP1 ( i )
level mete
r
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : 1kHz, 22.5kHz deviation
Output level : 1mV (more than 60dB)
TP (ANT)
0.01
µ F
1-676-002-
C
C101
C102
R106
R105
R109
R119
R120
R111
R107
R102
R108
R101
R104
R103
R
C103
C124
C105
C104
C125
Q
CF1
BPF101
CF2
D101
D102
BE
C
BCE
Q104
Q101
Q105
ECB
TP
(ANT)
TP
(LPF)
digital
voltmeter
TP
(ANT)
[MAIN BOARD]
(SIDE A)
TP (LPF)
1
5
13
15
20
24
10
12
IC101
C114 C115
C113
C
109
C
108
R121
R115
1
12
R113
R114
C111
C110
C107 C116
C112
CF3
TP
(19kHz)
frequency counte
r
TP (19kHz)
1
µ F/50V
[MAIN BOARD] (SIDE A)
0 dB=1µV
Adjustments Location :
CT2 : FM Frequency Coverage
Adjustment
CT1 : FM Tracking Adjustment
T1 : FM IF Adjustment
RV1 : FM Stereo (19kHz) Adjustmen
t
[MAIN BOARD] (SIDE A)