JVC 330 Service Manual page 152

Chapter 5---Troubleshooting
Problem and
Symptom to
Check
Bright Red, Green
or Blue area on
screen limited to
corners or edge.
Gray scale green in
bright levels.
Gray scale red in
bright levels.
Gray scale blue in
bright levels.
Picture—various
problems
Out of focus blurry
area on image
limited to R, G,
or B.
Small dark line or
dot in R, G, or B
image.
Bubbles in R, G, or
B image.
Image Ghost on
video.
Reversed ghost
image on screen.
Picture lacks depth
of field.
Video jitter and
noise.
Video jitter present
at only one
source.
Video image is not
level.
Black band at top of
video.
Model 330, 340SC, and 370SC Service Manual
Possible Solution
®
Adjust ILA Assembly Bias
and S
.
HADING
Subtract Green S
ENSITIVITY
add Red and Blue.
Subtract Red S
ENSITIVITY
add Green and Blue.
Subtract Blue S
ENSITIVITY
add Green and Red.
Clean oily spot off CRT, Prism, or
Projection lens.
Scratch in optics or CRT burn.
®
Replace affected ILA
Replace Burn-In CRT or ILA
assembly.
If projecting through glass, prevent
light
from reflecting back into the
lens
Adjust Contrast and Brightness.
Replace Video Processor Board.
Replace Raster Timing Generator.
Level projector or rotate CRT
Yoke.
Remove air bubbles from Prism.
Service
Manual
offset,
offset,
offset,
assembly. 4.12
®
4.7, 4.12
4.11
4.11
Operator
Manual
3.6 4.10
4.10, 4.11
4.12.1,
4.12.2
3.2
5-12