Emerson 20" Color Television 6420FE Service Manual page 33

Main CBA Top View
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.
TP601
+B
FOCUS-VR
(UPPER SIDE)
SCREEN-VR
(LOWER SIDE)
TP300
GND
VR661
+B ADJ
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE.
ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE
4A/125V
MÊME TYPE DE 4A, 125V.
NOTE :
The voltage for parts in hot circuit is measured
using hot GND as a common terminal.
7-11
BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER
SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED.
ALSO, IN ORDER TO HAVE THE ABILITY TO INCREASE THE INPUT
SLOWLY, WHEN TROUBLESHOOTING THIS TYPE POWER SUPPLY
CIRCUIT, A VARIABLE ISOLATION TRANSFORMER IS REQUIRED.
7-12
MAIN CBA
Ref No. Position
ICS
IC31 B-1
IC111 E-1
E-2
IC151
IC431 D-1
IC551 A-1
IC601 D-3
IC771 F-3
E-3
IC801
TRANSISTORS
Q31 C-1
Q111 F-1
Q131 E-1
Q161 E-2
Q321 D-1
Q361 D-1
B-3
Q571
B-2
Q572
Q601 B-4
Q602 C-4
Q631 D-2
Q652 D-2
Q672 D-2
Q673 D-2
Q674 D-2
E-3
Q681
D-3
Q682
Q696 D-3
Q801 E-3
Q811 E-3
CONNECTORS
CN571 A-3
CN691 D-4
E-1
CN801
E-3
CN802
WH301A D-1
WH501A A-3
TEST POINTS
A-3
TP300
TP591 A-3
TP592 A-3
TP601 B-4
VARIABLE RESISTOR
VR661 A-2
BL2700F01012-1