ESI VideoBridge 2150, Service Manual

Page: 191 / 332

3 . 5 V I DEO C I RCUI TRY
DANGER
THE V I DEO C I RCUI TRY CONTA I NS DANGEROUSLY H I GH VOLTAGE .
E XE R C I SE EXTREME CARE TO AVO I D POSS I BL E ELECT R I C SHOCK W H I C H
MAY R ESULT I N S EVERE I NJ URY O R DEAT H .
A l l v i d e o d i s p l a y c i r c u i t ry f o r the 2 1 5 0 / 2 1 60 is co n ta i n e d on one
c i rc u i t c a rd .
I t pro v i d e s a l l t h e s i g na l proc e s s i n g r e q u i re d for
d i sp l ay i ng v i d e o i n f o r ma t i o n on the C R T s c r e e n . Opera t i o n o f the
v i d e o c i rc u i t ry is d i s c u s s e d i n the f o l l ow i ng pa r a g r a p h s .
Re f e r t o S e c t i on 5 , s c h e ma t i c d i a g ra m P iN 4 8 6 4 2 f o r t h e f o l l ow i n g
d i s c u s s i on s .
+40VDC
BRIGHTNESS
I
VERTICAL R E TRACE
I
BLANKING
SWITCH ELEMENT
CURRENT
SENSE
VERTICAL
DEFLECTION
YOKE
+ 15 V IN
F i gu r e 3 - 1 6 .
e
l
s
l
i
5
FOCUS
HORIZONTAL
YOKE
LINEARITY WIDTH
V i de o C i r cu i t B l ock D i a g ra m
3
-
2 7
2 1 5 0 / 2 1 6 0 5 / 8 5
+ 15 voe