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6. FM/AM
Tuner Alignment Procedures
TFC-20
FM/AM Tuner & Equalizer Amp. P.C. Board Ass'y
Rear View
T401
R304
BLU
RED
©le ¢
[JS 666
L403
TAB NO. 136
11th Pin for AM
IF Stage Adjustment
Switch positions for FM adjustment, \
Fig. 20
Switch positions for AM adjustment
6-(1) FM
Section
Discriminator, Center Meter, Distortion and Signal Gain
Distortion Meter
AC VTVM
RF Generator
Oscilloscope
Fig. 21
1.
Connect
an RF generator,
1 kHz modulation
and 75 kHz deviation, to the antenna
terminals on the rear panel
through a dummy antenna.
2.
Connect an oscilloscope, distortion meter and VTVM to the Rec. Out Jacks on the rear panel.
3.
Tune to a frequency where there is no broadcasting.
4.
Adjust the bottom core of T201 so that the center meter indicates "0" (zero).
5.
Set the generator to 98 MHz.
6.
Set the dial pointer to 98 MHz.
7.
Adjust the top core of T201 so that the distortion is minimized at a value less than 0.4 %.
JR-S81
No. 2431
=i0)=
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