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| AV-2750S
AV-2760S
ADJUSTMENT
Measuring
Description
instrument
. Confirm that the voltage between TP-91 and TP-E
( +) is DC
130 V.
Bi POWER
SUPPLY
MAIN CIRCUIT
NOISE
(RF. AGC )
SUB BRIGHT tj
SUB
PICTURE
COLOR
SYNCHRO-
NIZATION
COMB
FILTER
VERTICAL
HEIGHT
. Adjust the NOISE VR so that the noise appears in the image.
2. Next turn the NOISE VR in a direction that the noise disappears
from the image and stop at the point where the noise has
disappeared from the image.
3. Turn to another channel and confirm that there are no abnormal
ities.
2
7
i
SUB BRIGHT VR
L 3 SUB PICTURE VR
COLOR SYNCHRO-
NIZATION
. Press the remote control reset button twice to set the brightness
to the standard level.
2. Adjustment
of SUB BRIGHT VR to optimum brightness.
Avoid excessive brightness
. Press the remote control reset button twice to set the picture to
the standard level.
2. Adjust the SUB PICTURE VR to the optimum picture.
. Receive the color bar signal image.
.
2. Connect pins ® and @®of iC201 to pin @ (+9V).
3. Adjust the COLOR SYNCHRONIZATION to obtain color syn-
chronization.
4. Remove the connections and check that the color synchroniza-
tion does not deteriorate on any of the channels.
1. Receive the color bar signal image.
2. Connect the oscilloscope to pin @ of 1C251.
Magnify the
chrome signal portions of the color bar waveform so that the
3.58 MHz elements become easy to observe.
3. Adjust DLP Transf.
(T7271 ), and minimize the 3.58MHz
elements.
4, Regulate the COMB FILTER adjustment VR ( R273 ) to further
minimize the 3.58MHz elements.
'ges
. Repeat steps 3 and 4 to fully minimize the 3.58MHz elements.
DL P TRANSF.
COMB FILTER VR
GENERATOR
Color element
. Receive a picture that enables vertical symmetry to be checked.
2. Using the VERTICAL HEIGHT VR, reduce the picture vertically.
3. Upon adjusting with the VERTICAL HEIGHT VR, return the
picture to normal vertically.
VERTICAL HEIGHT
VR
(No.60360) 21
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