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SX-727
8-5
MUTING THRESHOLD LEVEL
ALIGNMENT
1. Set SELECTOR switch to FM MONO.
2. Turn FM MUTING switch to ON.
3. Connect FM signal generator to 300Q
antenna input.
4. Connect AC VTVM to TAPE REC jack.
5. Set output level of generator to 25dB
(20juV),
with ±22.5kHz deviation, and
400Hz
or
1kHz
modulation.
6. Tune receiver accurately to generator
frequency.
7. Adjust VR1 on FM/AM unit exactly on
the borderline between muting and non¬
muting.
8-6
AM 455kHz ALIGNMENT
1. Set SELECTOR switch on front panel to
AM.
2. Connect 455kHz sweep generator to pin
15. Adjust generator output level to 60dB
(lmV).
3. Connect vertical oscilloscope input to
either L or R of TAPE REC jack.
4. Set tuning dial to high end position.
5. Adjust cores of CF4 and T5 for maxi¬
mum gain and symmetrical pattern on
oscilloscope.
8-7
AM TRACKING ALIGNMENT
1. Set SELECTOR switch to AM position.
2. For this alignment, bottom plate must be
installed.
3. Set signal generator to AM function, 30%
modulation with 400Hz.
Connect loop antenna to generator RF
output and place near receiver's ferrite
antenna. See Fig. 4.
4. Connect VTVM to TAPE REC jack.
5. Keep generator as low as possible for
minimum VTVM reading.
6. Tune generator and receiver to 600kHz.
Adjust core of T4 on FM/AM unit for
maximum VTVM reading, then adjust
core of T3 and ferrite antenna.
7. Re-tune
generator
and
receiver
to
1,400kHz.
8. Adjust trimmers of
turning capacitor
indicated in Fig. 3 to obtain maximum
VTVM reading.
13
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