Circuit Description - Tatung OMNISCAN SERIES Service Manual

3. CIRCUIT DESCRIPTION
3.1 SWITCHING MODE POWER SUPPLY (SMPS)
(P802)
r - - - ,
4
40-150V
I
+175V
r-1----)
DC/DC CONVERTER - - - - - - - - - - - - - - ) H DEFLECTION
I I I
I I I
I I I
350V
I I
SMPS
I I
(T401) - - - - - - - - ) DYNAMIC
UNIT
I I
FOCUS
I I
I I
40-150V
I L _____
>
DC/DC CONVERTER
------------------>
HIGH VOLTAGE
I I
I I
I I
I I
-210V
I
(FBT) ------------) G1
I
I
3
+75V
L ___________________________________________
>
VIDEO BOARD
I
I
2
I
+ 24V
1--1----------------------------------------->
VERTICAL CKT.
(24.5V)
I
& MAIN BOARD
PWB-
1641
L_T_J
I
1
I
GND
I
16V
I
r----->
LINEAR REGULATOR
------------------>
MAIN BOARD
I
I
12V
l----->
ZENER DIODE
----------------------->
H OSC CKT.
I
I
12V
~-----> S~P
REGULATOR
-------------------->
VIDEO BOARD
I I
6V
I
I L __
>
LINEAR REGULATOR
---------->
HEATER
I I
5V
I
I .
I L __
>
DIODE ----------------) VIDEO BOARD
I
12V
I
L _____
>
LINEAR REGULATOR ------"----------) MICRO BOARD
I
~~
I
I
5V
L __
>
LINEAR REGULATOR
--------->
MICRO BOARD
=
3-1
=