SRF-S54, SRF-S56 (serv.man2) - Sony Audio Service Manual (repair manual). Page 7

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SRF-S54/S56
7
7
TP5
(VCO)
TP1
(RF IN)
TP4
(OSC)
IC1
– MAIN BOARD (Conductor Side) –
L3
FM Stereo (38 kHz)
Adjustment
L2
2ND Local
Frequency
(57.1 MHz)
Adjustment
L4
FM Frequency
CT2 
}
Coverage
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
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
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

Procedure:
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

Procedure:
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
+
–
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:

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