Sony TR-8460 - Page 6

SECTION 3
CIRCUIT ADJUSTMENTS
Preparation
Test Equipments/Tools Required:
Rf signal generator (for a-m)
VTVM
rf signal VTVM
8 Q resistor generator festiset earphone
Screwdriver for alignment TX jack ke
Preparation: VTVM Connection: ‘a
To earphone jack with 8 Q load
resistor in parallel.
Oo pel eeeeeeeen oe
sae hig Se 8 Qlresistor
Modulation: 1-kHz 30-% amplitude-modulated signal
VOL Control Setting: MAX Fig. 3-1. | Fm frequency coverage and tracking
SQUELCH Control Setting: OFF adjustment setup
3-1. IF ALIGNMENT
Rf Signal
Generator
Frequency
10.7 MHz
(1 kHz
30% a-m)
Rf Signal
Generator
Coupling
VTVM
Connection
See Fig. 3-1
and Fig. 3-2
Earphone jack with
8 Q load resistor in
parallel
Remarks
VOL control
SQUELCH control :
MAX
OFF
Adjust for maximum meter reading.
3-2. FREQUENCY COVERAGE AND TRACKING ADJUSTMENT
Rf Signal Rf Signal
Receiver
Adjustment Generator Generator Dial Adjust Remarks
Coupling Frequency Setting
Frequency See Fig. 3-2 107.0 MHz Fully osc coil Adjust for maximum meter
Coverage left L3 reading.
VOL control >MAX
137.5 MH sc
z oe SQUELCH control: OFF
trimmer
CT2
Tracking 108 MHz Tune to rf coil
108 MHz LE?
signal
136 MHz Tune to rf trimmer
136 MHz CT 1
signal
from rf S)
Signal generator
rf trimmer
osc coil
L3
osc trimmer
CT2
cT1
rf coil
L2
MFT 1 IFT 4
IFT
2
IFT
3