JVC AV-2771S Service Manual page 33

MAIN / SUB
BRIGHTNESS
RATIO
adjustment
MAIN / SUB
COLOR & TINT
RATIOS
adjustment
Measuring
instrument
Pattern
generator
Oscilloscope
(H-rate 10:1)
Remote control
unit
Pattern
generator
Oscilloscope
(H-rate 10:1)
Remote control
unit
Adjustment part
Test point
SUB PICTURE
CONTRAST VR
(VRO03)
PY connector
pin-©
PY connector
pin-©
K connector DECODER TINT
pin-@(R-Y) VR
(VROO6)
K connector
pin-@(B-Y) DECODER
[CRT SOCKET | COLOR VR
PCB ASS'Y] (VRO05)
| AV-2771S
Description
. Use shorting clips or other means to connect PY
connector pin-© to ground.
. Receive the full white signal with color burst to both
the TV(antenna) and VIDEO input.
. Set for the PIP mode.
. Connec the oscilloscope to PY connector pin-©.
Adjust SUB PICTURE CONTRAST VR to equalize
the main sub picture levels, as indicsted in figure.
y Align
Sub picture
part
. Receive the color bar signal to both TV(antenna)
and VIDEO input.
. Set for the PIP mode.
. Connect the oscilloscope to CRT SOCKET PCB
ASS'Y K connector pin-@(R-Y) and pin-@(B-Y).
. Set the oscilloscope mode to X-Y.
. As shown in the figure, adjust DECODER TINT VR
to align the sub picture phase with the main picture
red phase.
. Then adjust DECODER COLOR VR to equalize the
sub and main picture saturation levels.
Sub picture
Main picture
X-Y mode
COLOR and TINT aligned for main
and sub picture.
(No.50577) 33