ESI VideoBridge 2150, Service Manual

Page: 193 / 332

3 . 5
V I DEO C I RCU I TRY
DANGER
THE V I DEO C I RC U I TRY CONTA I N S DANGEROUSLY H I GH VOLTAGE .
E X E R C I SE EXTREME CARE TO AVOI D POSS I BL E ELECT R I C SHOCK W H I C H
MAY RES U LT 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 t h e 2 1 5 0 / 2 1 60 i s con ta i n e d on one
c i rc u i t c a r d .
I t p r o 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 red f o r
d i sp l ay i ng v i d e o i n f o rma t i o n on t h e CRT s c r e e n . Opera t i o n o f the
v i de o c i rc u i t r y is d i s c u s s e d i n t h e f o l low i ng pa r a g ra p h s .
Re f e r t o S e c t i on 5 , s c he 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 o n s .
+40VOC
BRIGHTNESS
I
VERTICAL RETRACE
I
BLANKING
SWI TCH E LEMENT
CURRENT
SENSE
VERTICAL
DEFLECTION
YOKE
+ I 5 V IN
F i g u r e 3 - 1 6 .
e l s
l
i
S
FOCUS
HORIZONTAL
YOKE
HORIZONTAL H ORIZONTAL
LINEARITY WIDTH
V i d e o C i r c u i t B l o ck D i a g ra m
3
-
2 7
2 1 5 0 /2 1 6 0 5 /8 5
+ 15 VDC