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5-(2) Rear Panel
See page 13.
AC Male Connector /\
E03572-019P
Antenna Terminal
E03697-001
E23076-001
Signal Cord
Rear Panel
6. FM/AM
Tuner Alignment Procedures
6-(1) FM Section
L Channel Output Signal
R Channel
Output Signal
107 108 109
ap
ap
aD
L R GND
=
ae
+)
L103 L102 | L101
©
(A) R133
5
®
T102
R143
1c102
tee
ace
SSeS:
sei
1C1037¢
@
S
TP
@,
119
118
2457
Fig. 7
@
e
116
Front
Alignment Location for TXX-181-1
FM/AM Tuner
P.C. Board Ass'y
75:
752
PAD
ee
O
ST. MOD
{ :
a eet ae
2 VIVM
" scope
FM
SSG
Distor-
Fig. 8
T-V5L
No. 2463
Note:
Keep in the muting pushbutton
off during this
procedure.
Descriminator, Center Meter, Distortion and Signal Gain
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 AC
VTVM
to the TAB No. 107 (Left) or 108 (Right)
located on TXX-181.
3.
Connect
a DC VTVM
to TAB
No. 116 (Positive)
and TAB No. 118 (Ground).
4.
Tune to frequency where there is no broadcasting.
5.
Adjust the core shown arrow (A) of T101 so that
the DC VTVM
indicates ''0" (zero).
6.
Set the Generator to 98 MHz.
7.
Set the dial pointer to 98 MHz.
8.
Adjust the core shown arrow
of T101 so that
the distortion
is minimized
at a value less than
0.4 %.
Tracking and Sensitivity
Precaution:
No adjustment
is required. The tracking
and sensitivity have been adjusted properly
and
completely
at the
factory.
If any
special reason occasioned,
take the follow-
ing procedures very carefully.
Low Frequency
1.
Connect an RF Generator to the antenna terminals
on the rear panel through
a dummy antenna.
2.
Set the RF Generator to 88 MHz, a modulation of
1 kHz and deviation of 75 kHz to provide an input
of 2uV.
33
Connect
a VTVM
and
oscilloscope
to the TAB
No. 107 (Left) or 108 (Right).
4.
Set the dial pointer to 88 MHz.
Ds
Adjust the three coils L103, L102 and L101 in the
tuning gang to maximum the output.
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