MEA 1786FD2
CRT Monitor Service Guide
Circuit Operation Theory
15
3.5 Control circuit
*
*
4
1
VCC
OUT
ISSEN
GND
FB
COMP
R/C
VREF
7
6
4
3
5
2
1
8
G
K
A
+
+
IC601
IC603
ZD602
ZD603
M603
M604
C619
C620
C618
C625
D611
D612
R620
R613
R607
R611
R615
R614
R612
R738
R616
R622
C627
C617
C615
C616
UC3842
MCR100-3
24V
5.1V
(D)
50V
0.022U
(D)
50V
820P
(D)
50V
0.01U
(OPEN)
1N4148
1N4148
1N4004
10K
36K
2W
0.15
1K
51K
100K
47
1/2W
82
10K
510
50V
10U
(EL)
50V
4.7U
(EL)
50V
2200P
(PE)
100V
0.01U
(PE)
+6.5VA
The current mode control IC UC3842 is used in the switching power supply which function of each
pin
described as follows.
pin 1 : Error amplifier output
pin 5 : Ground
pin 2 : Error amplifier reverse input
pin 6 : Output
pin 3 : Current sense
pin 7 : VCC
pin 4 : OSC sawtooth
pin 8 : Reference Voltage:5V
Содержание 1786FD2
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