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Chapter 2—Functional Description
Model 330, 340SC and 370SC Service Manual 2-25
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.