JVC 330 Service Manual page 151

Problem and
Symptom to
Check
Video has shadow
on left or right
edge.
Video image not
squared.
Video image bowed
at left/right edge
or top/bottom.
Picture horizontal
linearity.
XY Convergence
Linearity different
between colors,
cannot converge.
Horizontal size
different
between colors.
Vertical size
different
between colors.
Not enough range in
Red/Blue XY
convergence.
Picture color
balance
Missing either Red,
Green, or Blue
video.
Red, Green, or Blue
lacks color.
Internal gray scale
correct but
incorrect video
color.
Dim area on screen
when viewing
flat field.
Black video image
overdriven.
5-11
Possible Solution
Correct using M P
ENU
P P
INCUSHION OSITION
Correct using P
INCUSHION
P and K
OSITION EYSTONE
Correct using P
INCUSHION
arrow.
Correct using L
INEARITY
L
.
INEARITY
Yoke not properly set on CRT.
Adjust horizontal sizing coil on
yoke.
Set vertical size and linearity
adjustment on Vertical
Deflection Board.
Adjust Red or Blue P
OSITION
compensate.
®
ILA assembly bias voltage bad or
no video-replace Video
Processor Board.
®
Replace ILA assembly or Video
Amplifier Board.
Readjust C adjustments.
ONTRAST
Adjust collimating lens.
Adjust T , G2 and
HRESHOLD
B
.
RIGHTNESS
Model 330, 340SC, and 370SC Service Manual
Chapter 5---Troubleshooting
Service
Manual
and
OSITION
.
.
left/right
and E
DGE
3.3, 3.4
to
4.12, 4.8
Operator
Manual
3.2
3.5
4.8.9
4.11
4.4
3.10 4.6, 4.10