JVC 340 SC - Manual (Page 150)

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