SRF-FQ9 - Sony Audio Service Manual (repair manual). Page 4

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SECTION  3
ELECTRICAL  ADJUSTMENTS
AM  FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
520 kHz
CT3
1750 kMHz
AM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
600 kHz
CT4
1400 kHz
FM  FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
86.5 MHz
CT1
109.5 MHz
FM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5 MHz
CT2
109.5 MHz
AM Section

Setting:
BAND switch: AM
FM Section

Setting:
BAND switch: FM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the timmer capacitors.
AM RF signal
generator
Put the lead-wire
antenna close to 
the set.
30% amplitude modulation
by 400 Hz signal
Output level: as low as posible
FM RF signal
generator
22.5 kHz frequency deviation
by 400 Hz signal.
Output level: as low as possible
0.01 
µ
F
TP (RF IN)
set
headphone jack ( 
2
)
level meter
24 
Ω
+
–
2nd OSC Adjustment

Setting:
BAND switch: FM

Procedure:
1. Connect the frequency counter to TP (OSC).
2. Adjust L2 for 56.75 MHz reading on the frequency counter.

Specification: 56.5 MHz to 57.0 MHz
Connection:
FM STEREO (38 kHz) Adjustment

Setting:
BAND switch: FM

Procedure:
1. Connect 10 µF Capacitor to 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: 37.95 kHz to 38.05 kHz
Connection:
frequency counter
1 
µ
F/50 V
TP (OSC) (IC1 PIN 
@¢
)
+
+
–
IC1
TP
(GND)
TP
(38 kHz)
+
10 
µ
F
– Conductor Side –
frequency counter
1 
µ
F/50 V
TP (VCO) (IC1 PIN 
!ª
)
+
+
–
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