JVC 370 SC Interlocks and Protection, Horizontal Deflection Board P/N 102523 HDB, Inputs, Output

Chapter 2—Functional Description

	System Power Supply
Inputs	Description
+15V	Power for the analog section of the RTG including the PLL.
	(TP 30)
-15V	Power for the analog section of the RTG including the PLL.
	(TP 29)
+5V	Power for the digital portions of the RTG. (TP 3)
AGND	Return for +/-15V, separated from DGND by an inductor.
DGND	Return for +5V, separated from AGND by an inductor.

Interlocks and Protection

This section describes the interactions between boards where one (1) board may cause others to perform protection functions.

Input

None

Output

If the PLL falls out of sync, a signal indicating an out-of-lock condition (/PLOCK) will be sent to the SCB.

Internal

When no external sync signal is present, the RTG will select it's internal sync signal, thus preventing the need to provide another source for overlay generation.

Horizontal Deflection Board P/N 102523 (HDB)

The horizontal deflection board plugs into the electronics card cage and is the forward- most card in the card cage.

The following functions are provided by the HDB:

Drive main horizontal deflection coils to provide horizontal raster scan.

Horizontal raster centering.

Horizontal width adjustment.

Side pincushion correction.

L/R keystone correction.

Horizontal sweep reversal.

Horizontal phase adjustment.

Oscillator for vertical deflection.

The block diagram (see Figure 2-12) description and the I/O description, in the section following, provide information to perform module level troubleshooting.

Model 330, 340SC and 370SC Service Manual 2-25