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TX-3Ss800
7.2
FM TUNER
APC Circuit
1. Turn the FUNCTION
switch to the FM posi-
8. Set
the
dial
frequency
of -the
TX-9800
to
tion.
88MHz.
2. Connect the frequency counter between termi-
9. Connect
the oscilloscope between terminal 11
nal 4 and 7 (ground).
and 7 (Ground).
3. Adjust
the
TC,
to
obtain
a
reading
of
10. Adjust the VR,
to obtain a reading of 1.2V
100.000kHz (+2Hz) on the frequency counter.
(peak to peak) on the oscilloscope.
4. Disconnect the frequency counter.
11. Connect
the DC
voltmeter
between
terminal
5. Connect the wire between terminal 2 and 7.
11(+) and 1(-).
6. Connect
the DC
voltmeter
between
terminal
12. Adjust the VR, to obtain a reading
of +10mV
1(+) and 7(-).
(410mV)
on
the
DC
voltmeter.
Disconnect
7. Adjust the VR; to obtain a reading of +8.5V
the DC voltmeter.
(+20mV) on the DC voltmeter. Disconnect the
DC voltmeter.
APC assembly
Fig. 7-2
15
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