JVC 340 SC - Manual (Page 96)

Chapter 3---Service Adjustments
3-6 Model 330, 340SC, 370SC Service Manual
R
328
R
411
R
311
R
211
R
228
R
428
Blue
Vertical
Size Red
Vertical
Linearity
Blue
Vertical
Linearity
Green
Vertical
Linearity Green
Vertical
Size Red
Vertical
Size
R
36
R R R
96 139 171
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.
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.