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2565 M141N)
2-6. MTS
(Multiplex
TV System)
DECODER
CIRCUIT
ADJUSTMENT
" Unless otherwise specified, all test point and adjustment location on
the
TN-3 board.
No.
1
2
3
Item
STEREO
SEPARA-
TION
STEREO
(1 17.5 Hz)
BILINGUL
(274.1 Hz)
Input
Audio signal
(R ch...l KHz
100% mod.
L ch...4OOHz
unmod.)
from
Audio MPX
TV signal
generator
Tv
broadcast
(Stereo)
Tv
broadcast
(Bilingul)
Mode
E-E
E-E
E-E
Point
AUDIO
OUTPUT
terminal
(L ch)
IC631 pin 5
IC631 pin 6
Location
VR631
adjustable
through
CP- 1 board
VR632
Remark
1. Set the pilot signal for the stereo mode. With
the L ch unmodulated, provide 1 KHz 100%
modulation on the R ch.
2. Connect an oscilloscope to the audio output
terminal (L ch) and adjust VR631 for mini-
mum waveform peak-to-peak value.
1. Select the TV channel to stereo program me.
2. Adjust VR632 so that the waveform is max-
imize.
1. Select the TV channel
to builingul
pro-
gramme.
2. Adjust VR633 so that the waveform is max-
imize.
VR633
PI 0MO04
1[—[5
~
1 ~1"
CN632
VR631
CN631
SEPARATION
1
L
1
14
VR632
VR633
117.5 Hz 274.1
tiz
Fig. 2-6-1 TN-3 board (Parts side view)
L
—lo—
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