Vertical Linearity Tracking - JVC 330 Service Manual

Chapter 3---Service Adjustments
Blue
Vertical
Size
R
328
Figure 3-3 Vertical Size and Linearity Controls on the Vertical Deflection Board.

3.4 Vertical Linearity Tracking

If the vertical linearity is not completely linear, use a small slot screwdriver and
adjust the vertical linearity controls on the Vertical Deflection Board (refer to
Figure 3-2).
NOTE: The Vertical Linearity pots are factory adjusted and will not normally
need adjustment. The Green Vertical Linearity pot (R-211) in particular, should
not need to be adjusted unless the Green Yoke or Green CRT has been replaced.
If the Green Vertical Linearity is off, however, it should be adjusted.
To adjust vertical linearity:
1. Select Test Pattern 2.
2. Remove the projector cover.
3. Remove the electronics module cover.
4. View Red over Green and position Red (use the POS control and the
arrow keys on the remote) so that the Red lines at the edge match the
Green lines.
5. Adjust the Red Vertical Linearity pot R-411 so that Red linearity matches
Green.
6. Repeat the same procedure for Blue (R-311).
7. Replace the electronics module cover and the projector cover.
3-6
Blue
Vertical
Linearity
Red Green
Vertical Vertical
Linearity Linearity
R R R
411 311 211
CAUTION!!!
Do not adjust the pots that are shaded! They are
factory adjusted. Do not adjust the Green Vertical
Size or Green Vertical Linearity unless the Green
Yoke or Green CRT has been replaced.
Red
Green
Vertical
Vertical
Size
Size
R
R R
R
228 428 96 139 171
36
Model 330, 340SC, 370SC Service Manual
R R