Adjustments - Sony SRF-M55 Service Manual

FM Section
0 dB=1µV
Setting :
FM RF signal
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
set
headphones jack EP1 ( i )
Connection:
For FM frequency coverage adjustment
digital
voltmeter
TP (LPF)
R120
D101
C125
R111
TP
(LPF)
R106
C103
C105
D102
R109
R105
C104
[MAIN BOARD]
(SIDE A)
• 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
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
CT2 87.5MHz
Confirm 108.0MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
CT1
SECTION 3

ADJUSTMENTS

0.01 µ F
TP (ANT)
level meter
16 Ω
TP
(ANT)
CF1 CF2
TP
(ANT)
BPF101
C124
BCE
Q104
Q101
C
B E
Q105
R119
1-676-002-
10.7MHz
adjustment value: 2V
standard value: 1.5 – 2.5V
standard value: 9 – 13V
98MHz
FM STEREO (19kHz) Adjustment
Setting :
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : 1kHz, 22.5kHz deviation
Output level : 1mV (more than 60dB)
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:
[MAIN BOARD] (SIDE A)
R115
13
15
C111
C112
20
C110
24
C107
Adjustments Location :
[MAIN BOARD] (SIDE A)
– 5 –
0.01 µ F
TP (ANT)
frequency counter
TP (19kHz)
1 µ F/50V
TP
(19kHz)
R121
12
10
5
IC101
CF3
1
C116
RV1 : FM Stereo (19kHz) Adjustment
T1 : FM IF Adjustment
CT1 : FM Tracking Adjustment
CT2 : FM Frequency Coverage
Adjustment