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FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for maximum reading on level meter
L6
86.5 MHz (Except Italian)
87.35 MHz (Italian)
CT1
109.5 MHz (Except Italian)
108.25 MHz (Italian)
– 4 –
SECTION 4
ELECTRICAL ADJUSTMENT
Setting:
SENS switch: DX
FM STEREO (38 kHz) Adjustment
Setting:
SENS switch: DX
Procedure:
1. Connect 10
µ
F Capacitor to TP (38 kHz) and TP (GND).
2. Connect the frequency counter to TP (VCO).
3. Adjust L4 for 38 kHz
3. Adjust L4 for 38 kHz
±
20 Hz reading on the frequency counter.
Connection:
22.5 kHz frequency deviation
by 400 Hz signal.
Output level: as low as possible
by 400 Hz signal.
Output level: as low as possible
FM RF signal
generator
generator
0.01
µ
F
TP (RF IN)
• Repeat the procedures in each adjustment several times, and the
frequency coverage adjustments should be finaly done by the
timmer capacitors.
timmer capacitors.
2nd OSC Adjustment
Setting:
SENS switch: DX
Procedure:
1. Connect the frequency counter to TP (OSC).
2. Adjust L2 for 56.75 MHz
2. Adjust L2 for 56.75 MHz
±
0.25 MHz reading on the frequency
counter.
Connection:
frequency counter
1
µ
F/50 V
TP (OSC) (IC1
@¢
PIN)
+
+
–
• Adjustment Location: MAIN board
— Component Side—
S1
S3
L4
L2
L6
CT1
CV1
L4: FM STEREO
(38 kHz) ADJUSTMENT
L2: 2nd OSC
ADJUSTMENT
CT1: FM FREQUENCY
COVERAGE
ADJUSTMENT
ADJUSTMENT
L6: FM FREQUENCY
COVERAGE
ADJUSTMENT
ADJUSTMENT
f
min
f
min
— Conductor Side—
frequency counter
1
µ
F/50 V
TP (VCO) (IC1
!ª
PIN)
+
+
–
TP
(RF IN)
TP
(VCO)
TP
(OSC)
IC1
TP
(GND)
TP
(38 kHz)
+
10
µ
F
16 V
set
headphone jack (
2
)
level meter
16
Ω
+
–
–
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