JVC 330 Service Manual page 150

Chapter 5---Troubleshooting
Problem and
Symptom to
Check
Image out of focus
Spacer balls not
visible.
®
ILA Spacer balls
visible but
image fuzzy.
CRT focus range is
limited and
image is fuzzy.
CRT focus not
effective.
CRT focus not
effective.
CRT focus limited
due to focus rod
range.
Image blurry with
shadow on right
edge.
Characters do not
appear legible.
CRT focus problem
limited to single
color.
G2 mis-adjusted.
Sensitivity offset set
too high.
Picture geometry
Picture not
centered.
Picture size
incorrect.
Picture wrap around
left or right
edge.
Retrace lines on
raster.
Model 330, 340SC, and 370SC Service Manual
Possible Solution
Set projection lens focus so ILA
spacer balls are visible.
Adjust CRT Mechanical Focus.
Adjust electronic focus.
Set Relay Lens against back stop.
®
Ensure ILA assembly is installed
correctly and clamps are snug.
Readjust fixed rod at upper left of
CRT mounting bracket.
®
Replace ILA Assembly.
®
Replace ILA Assembly.
Replace CRT.
Reset G2.
Reset sensitivity offset.
Adjust using P and P
HASE
Adjust using S and B
IZE
Reset left or right B
LANKING
Reset T B
OP LANKING
Service
Manual
®
.
OSITION
.
LANKING
.
.
Operator
Manual
4.5
3.7 4.7.2
3.8 4.7.3
4.12
3.7
4.12
4.12
4.7
3.10
4.8
5-10