Sylvania SST4323 Service Manual page 34

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
B-2
IC33 Q682
E-5
IC151 Q683
IC333 F-5 Q696
A-1
IC431 Q825
C-2
IC551 Q831
IC601 C-4 Q832
IC771 D-1 Q841
IC801 E-2
Q851
TRANSISTORS Q951
Q21 C-1 Q956
C-1 Q961
Q33
Q111 F-3 CONNECTORS
Q131 F-4 CN301
Q141 E-5
CN571
Q191 F-5 CN691
Q321 E-3
CN801
Q531 C-2 CN802
Q533 C-2 WH301A
Q547 B-2 WH501A
Q551 B-2
Q552 B-2 TP300
B-2
Q561 TP301
Q571 B-4 TP302
Q572 C-2 TP591
B-1 TP592
Q601
Q602 B-4 TP601
Q652 D-4 VARIABLE RESISTOR
D-3
Q672 VR561
Q673 D-3 VR562
Q674 D-3 VR661
Q681 D-3
7-12 BL6650F01011-1
Position
D-4
D-4
D-4
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
TEST POINTS
A-4
A-2
A-4
A-3
A-3
B-5
B-2
B-2
B-2