JVC Model 200 - Manual (Page 128)

Chapter 5---Troubleshooting
Table 5-3. Troubleshooting Guide (continued)
PROBLEM CHECK POSSIBLE SOLUTION SECTION
Arc Lamp Brightness flicker or
picture is very dim. Arc Lamp may have too
many hours of usage.
Replace Arc Lamp.
4.4
Image out of focus Spacer balls not visible. Perform the Projection
Lens Focus procedure.
User’s Guide 5.5.15
ILA
®
“spacer balls” are
visible but the image is
fuzzy.
Perform the CRT
Mechanical Focus
procedure.
3.5
CRT focus range is
limited and the image is
fuzzy. Adjust the Electronic
focus.
5.6
CRT focus in not
effective. Ensure the ILA
®
assembly is installed
correctly.
4.16
Image blurry with
shadow on right edge. Replace ILA
®
assembly. 4.16
Characters do not
appear legible. Replace ILA
®
assembly. 4.16
CRT focus problem is
limited to one color. Replace CRT. 4.15
Sensitivity Offset is set
too high. Reset Sensitivity Offset. User’s Guide 5.9.2
Picture Geometry Picture not centered or
sized correctly. Repeat the Blanking,
Phase, Size, and
Centering procedures.
User’s Guide 5.4.3,
5.4.4, 5.5.1, 5.5.2.
Picture “wraparound” at
left or right edge. Readjust Blanking and
Phase.
User’s Guide 5.4.3,
5.4.4.
Retrace lines on raster. Adjust TOP Blanking. User’s Guide 5.4.3.
Image not squared. Check Geometry and
readjust if necessary.
User’s Guide 5.5.3,
through 5.5.10.
Image bowed at left/right
edge or top/bottom. Check Bow, Pincushion
Balance, and Pincushion
adjustments.
User’s Guide 5.5.3,
5.5.4, 5.5.10.
Picture Linearity. Readjust Horizontal,
Vertical, or Edge
Linearity.
User’s Guide 5.5.7,
5.5.8.
XY Convergence Linearity is different
between colors. Unable
to converge. Yoke not properly set on
CRT. Perform CRT
Rotation procedure.
3.6
Horizontal size is
different between colors. Adjust horizontal coils on
Scan Reversal Board.
3.10
Vertical size is different
between colors. Adjust vertical size pots
on Horizontal/Vertical
Deflection board.
3.10
Table 5-3. Troubleshooting Guide (continued)
Model 200 Service Manual 5-7