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15501(N)
Xl
2-4. MTS DECODERCIRCUITADJUSTMENT
L"
If adjusting
the MTS
Decoder circuit,
special equipment
.
Before
making
these
adjustments,
be sure to make the
shown
in section
2-4-1. is necessary.
adjustments
described
in section
2-1, "Servo
Circuit.",
.
Improper
adjustment
will cause loss of performance
of
section
2-2,
"Video
Circuit.",
and
section
2-3,
"/lUdiO
stereo sound
and bilingual
sound
detection.
Circuit."
2-4-1. TEST EQUIPMENT
AND STANDARDS
REQUIRED
Audio
Multiplex
TV signal
Generator
Oscilloscope
AC Voltmeter
Low Path Filter
15 kHz (48dB/oct)
2-4-2.
LOCATION
OF ADJUSTMENT
POINTS
P36200E1X
;"
;
L. ---,
CN303,8'" ">
h
rvvo
:
IC602
1
11
:-"..;":
::
0
[ [
V~631
I
:, . . .../
Q
~SEpARATION
[
nl
CP-1
PWB
(Foil
side)
Fig. 2.4.1
Note:
Set the following
remote
control
button
to the positions
indicated
below,
before
making
following
adjustments.
REMOTE CONTROL BUITON
POSITION
TAPE SPEED
SP
INPUT
AV
AUDIO
LR
2-4-3. SEPARATION ADJ.
r
Measuring Point
Measuring Equipment
ADJ.
Condition
AUDIO
OUTPUT
Audio
Multiplex
TV
E-E mode
terminal
signal
generator
EURO
pin3(Lch)
Oscilloscope
Low path filter
15 kHz (48 dB/oct)
I
ADJ. Location
I
ADJ. Value
VR631
(SEPARATION)
Minimum
level
1.
2.
3.
4.
Input the output
signal
of the audio
multiplex
TV signal
generator
into the VCR ANT input terminal.
Connect
the oscilloscope
to the audio
output
terminal
EURO
pin3 (Lch) of the VCR via the LPF.
Set the audio multiplex
TV signal
generator
as follows.
Audio
signal
Rch: 1 kHz 30% modulation
Audio
signal
Lch: Unmodulation
Adjust
VR631
(SEPARATION)
so that the output
of the
audio
output
terminal
(Lch) is brought
to its minimum
level.
L
–15–
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