Emerson 20" Color Television 6420FE - Manual (Page 26)

6-5
Power Supply Block Diagram
L2401BLP
4A/125V F601 4A/125V
LINE FIL
TER
L601
AC
6
0
1
A
C
CORD
DEGA
USSING
COIL DG691
CN691
PS691
BRIDGE RECTIFIER
D605 - D608
HO
T
COLD
T601 6 4 2 1
11 12 8 7
4 3
IC601 ERR
OR
V
O
LT
A
G
E DET
Q601
Q602
LIMITER
SWITCHING
Q652
VR661 +B ADJ
Q673 SWITCHING CONTR
OL
Q672
Q681
Q696
RL601
+8V SWITCHING
MAIN CB
A
+B DEF +B +5V
-CTRL2
(T
O PIN 18 OF IC111)
P-ON+8V DG-ON-H (T
O PIN74 OF IC111)
+8V
-CTRL
(T
O PIN40 OF IC111)
AL+33V P-ON+5V AL+12V
Q111
NO
TE :
The v
oltage f
or par
ts in hot circuit is measured using
hot GND as a common ter
minal.
+B
TP601
10
SWITCHING
PR
O
TECT
-2
(T
O PIN 67 OF IC111)
BA
CK-UP
PR
O
TECT
-1
(T
O PIN68 OF IC111)
Q682
P-ON+5V +5V
-CTRL
(T
O PIN28 OF IC111)
+5V SWITCHING
+5V SWITCHING
AL+9V
Q321 +9V SWITCHING
Q674 SWITCHING P-ON-ON
P-ON-H (T
O PIN79 OF IC111)
HOT CIRCUIT. BE CAREFUL.
FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 4 A, 125V FUSE.
CAUTION: ATTENTION:
UTILISER UN FUSIBLE DE RECHANGE DE MÊME TYPE DE 4A, 125V.
4A/125V
1 2
FEED BA
CK
SWITCHING DG-ON-ON
CAUTION ! Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. If Main Fuse (F601) is blown, check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail.
9
PR
O
TECT
-4
Q631 OV
E
R
VO
LT
A
G
E
PR
O
TECT
RF
TO CR
T/H.V
.
BLOCK TO AU
D
IO
BLOCK