DEC VT220 - 8.2 Major Circuits and Components

8.2 MAJOR CIRCUITS AND COMPONENTS
The monitor circuits
components/circuits.
(Figure 8-2)
consist of the following
• Video amp
•
Horizontal deflection circuit
• Flyback transformer
• Vertical deflection circuit
• Dynamic focus
• Brightness control
• CRT
• Yoke assembly
• +12 V filter
The yoke assembly is described in conjunction with the horizontal
and vertical deflection circuit descriptions. No description is
provided concerni +12 V filter.
NOTE
Circuit illustrations provided are based
on REV A of CS 5415651-0-1.
CONTRAST
THUM8\VHE EL
BRIGHTNESS
THUMBWHEEL
ViDEO
AMP
DYNAMIC
FOCUS
FLYBACK
TRANS
TOPS_- __ ........J
FROM
VIDEO -- .... OEF
LOGiC
FROM VER IN VERTICAL
VIDEO '-C:--_<I'j OEF LECTION t------ -.J.._,--....L.:...:..:..J
LOGIC CiRCUITS
Figure 8-2 Monitor Circuits Block Diagram
8- 2