Mitsubishi Electric 1786FD2 Service Manual page 58

MEA 1786FD2 CRT Monitor Service Guide
Switching Power Supply Operation Theory
1. General Specification
Input Voltage : 90~264VAC (FULL RANGE)
Input Frequency : 47~63Hz
Output Requirement:
2. Block Diagram
AC
INPUT
3. Circuit Operation Theorem
3.1 RFI FILTER
L
N
FG
This circuit designed to inhibit electric and magnetic interference for meet FCC, VDE, VCCI standard
requirements.
+6.3V
+13V
+80V
+45V
DEGAUSS
CIRCUIT
RECTIFIER
RFI
&
FILTER
FILTER
L602
C601
0.47U
3 4
R601
250V
(X)
1 2
Output
ISOLATION
SWITCHING
TRANSFOR
ELEMENT
-MER
FEEDBACK
CONTROL
POWER
CIRCUIT
SAVING
CONTROL
C603
2200P
250V
(Y)
C602
2200P
250V
(Y)
Circuit Operation Theory
MAX. Load Current
0.7A
1.0A
0.15A
1.0A
OUTPUT
RECTIFIER
AND
FILTER
L603
L604
OUTPUT
12