Sylvania Emerson 6427FD/EWF2703 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.
NOTE :
The voltage for parts in hot circuit is measured
using hot GND as a common terminal.
TP601
+B
FOCUS-VR
(UPPER SIDE)
SCREEN-VR
(LOWER SIDE)
TP300
GND
TP302
15kHz
VR661
+B ADJ
VR561
PCC
VR562
WIDTH
TP301
AGC
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.
7-11
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.
MAIN CBA
Ref No. Position Ref No.
ICS TRANSISTORS
IC33 B-2 Q702
E-5
IC151 Q751
F-5
IC333 Q761
IC431 A-1 Q791
C-2
IC551 Q792
IC601 C-4 Q793
IC771 D-1 Q794
IC801 E-2
Q825
TRANSISTORS Q831
Q21 C-1 Q832
C-1
Q33 Q841
Q111 F-3 Q851
Q131 F-4 Q951
Q141 E-5 Q956
Q191 F-5 Q961
Q321 E-3 CONNECTORS
Q531 C-2
CN301
Q533 C-2 CN571
Q547 B-2
CN691
B-2
Q551 CN801
Q552 B-2 CN802
B-2 WH301A
Q561
B-4 WH501A
Q571
Q572 C-2 TEST POINTS
B-1
Q601 TP300
B-4
Q602 TP301
Q652 D-4 TP302
D-3 TP591
Q672
D-3 TP592
Q673
Q674 D-3 TP601
D-3 VARIABLE RESISTORS
Q681
D-4
Q682 VR561
Q683 D-4 VR562
Q696 D-4 VR661
7-12 BL6650F01011-1
Position
D-2
C-1
C-1
C-1
C-1
D-1
D-1
E-2
E-3
F-3
F-2
E-3
D-1
D-1
C-1
A-1
B-3
D-5
E-2
E-5
D-4
A-4
A-4
A-2
A-4
A-3
A-3
B-5
B-2
B-2
B-2