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SUB COLOR &
TINT
adjustment
COLOR
SYNCHRONI-
ZATION
adjustment
SEPARATION
adjustment
FOCUS
adjustment
Measuring
:
Test
point
instrument
P
Adjustment part
TP-47B
VSM SERVICE
[CRT SOCKET | switch
PCB Ass'y]
($707)
Pattern
generator
Oscilloscope
(H-rate 10:1)
Remote control
unit
COLOR SYNC.
trimmer capacitor
(C315)
Pattern
TP-51
generator
1C101 pin-@
Oscilloscope
(H-rate 10:1)
1C101 pin-@
(9V line)
VARIABLE
AUDIO
OUTPUT
L&R
SEPARATION VR
(R601)
TV multi -
channel sound
generator
Oscilloscope
(H-rate 10:1)
L - Channel signal waveform
Minimum
R - Channel crosstalk portion
FOCUS VR
(built-in FBT)
AV-2771S
Description
. Use
the remote
control
unit and
reset
the
AV
STATUS(TINT, COLOR, PICTURE, BRIGHT and
DETAIL) .
. Receive the color bar signal.
. Set the VSM SERVICE switch to the S position.
. Correct the oscilloscope to TP-47B
. Press a FUNCTION key(A, V7, +, -) of the remote
control unit.
Confirm
picture as indicated
in the
figure.
;
. Select COLOR
and adjust the
+/- keys so that
waveform "a" indicated in the figure for 12V.
. Select PICTURE
and adjust the
+/-keys so that
waveform "b" indicated in the figure for 25V.
. Repeat above steps 6 and 7 to obtain the specified
values for waveform "a" and "b" .
. After adjusting, return the VSM
SERVICE
switch
to N position.
. Receive the color bar signal.
. Use ashorting clip or other means to connect TP-
51, 1C101 pin-@® and 1C101 pin-@ (9V line).
—
. Adjust the COLOR
SYNC. trimmer capacitor to
change the picture from color stripes to still color
bar.
. Remove the connections and check that the color
synchronization does not deteriorate on any of the
channels.
. Set the TV multichannel sound signal generator for
generating stereo signal and output signal of about
3kHz from the left channel.
. Connect
an oscilloscope
to the
"L"
output
and
obtain a clear view of 1-cycle
portion of 3kHz
waveforms.
. Change connection of the oscilloscope to the "R"
output and expand the voltage axis.
. Adjust the SEPARATION
VR
and
minimize
the
3kHz crosstalk portion.
1. Adjust the FOCUS VR to obtain clear pictures.
. Check that pictures have been adjusted to optimum
" appearance in both center and peripheral areas of
the screen.
(No.50577) 29
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