![background image](http://html1.mh-extra.com/html/viewsonic/va720-1/va720-1_service-manual_1020964020.webp)
7. THEOR
Y OF OPERATION
7. WORKING
THEOREM
A. DC-DC CONVERTER
! "# $%&' ()* "+,-&' "#-&'
!-
-"# $%& )-./
0)1(2)
2)22
B. A/D converter
3*!45+)
3*$66326 ,- 22/
45+'7)(( ,- (
)+)-- /(6-8-,9:/
32 ( 2( !#3
(22 ))
:0;<! 1( 8
!=302( (/):0;<!
1(
!#3 2( 2)2
5<*'
)*) )'3*$663())
2' 2
C. Scaling controller
!2530>530>53
)
0*-? ( @= ( (2
2 *43 2 ' 86% 2 (
22(
% 2 2/ 86% 2 )
"2' ' A34' @= ' & 0 "4&
%,1)'5)
22('222/(
5( )6 8@
('$ 8@
,6 ':('('*B'5!#.
3A>=< ( ' #!*=<
0- *0
' +.#=< @
%,!
0*-0*---!
0>53C#!*23#!*245+
22'82!4
22#!*22
!42
45+2 (86 3@*'
,6 45+ 0*- C '
ViewSonic Corporation
1
6
Confidential
–
Do
Not
Copy
VA720-1
VE175/b
Summary of Contents for va720-1
Page 1: ......
Page 23: ...9 2 MAIN PCB BOTTOM VIEW ViewSonic Corporation 19 Confidential Do Not Copy VA720 1 VE175 b...
Page 24: ...9 3 CON PCB TOP VIEW ViewSonic Corporation 20 Confidential Do Not Copy VA720 1 VE175 b...
Page 25: ...9 4 CON PCB BOTTOM VIEW ViewSonic Corporation 21 Confidential Do Not Copy VA720 1 VE175 b...
Page 26: ...9 5 POWER PCB TOP VIEW ViewSonic Corporation 22 Confidential Do Not Copy VA720 1 VE175 b...
Page 27: ...9 6 POWER PCB BOTTOM VIEW ViewSonic Corporation 23 Confidential Do Not Copy VA720 1 VE175 b...