JVC 330, 370 SC, 340 SC service manual Vertical Linearity Tracking

Chapter 3---Service Adjustments

Blue

Vertical

Linearity

Blue	Red	Green	Green	Red
Vertical	Vertical	Vertical	Vertical	Vertical
Size	Linearity	Linearity	Size	Size

	R		R		R	R	R		R		R		R		R	R
328		411		311		211	36	228		428		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 3-3Vertical 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 Model 330, 340SC, 370SC Service Manual