Sylvania SRT2232X 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 Q751
IC151 E-5 Q761
IC333 F-5 Q791
A-1
IC431 Q792
IC551 C-2 Q793
IC601 C-4 Q794
D-1
IC771 Q825
IC801 E-2 Q831
TRANSISTORS Q832
Q21 C-1
Q841
Q33 C-1 Q851
Q111 F-3 Q951
Q131 F-4 Q956
Q141 E-5 Q961
Q191 F-5 CONNECTORS
Q321 E-3
CN301
Q531 C-2 CN571
Q533 C-2
CN691
Q547 B-2
CN801
Q551 B-2 CN802
B-2 WH301A
Q552
Q561 B-2 WH501A
Q571 B-4
C-2
Q572 TP300
B-1
Q601 TP301
Q602 B-4 TP302
D-4 TP591
Q652
D-3 TP592
Q672
Q673 D-3 TP601
D-3 VARIABLE RESISTOR
Q674
Q681 D-3 VR561
Q682 D-4 VR562
Q683 D-4 VR661
Q696 D-4
7-12 BL6650F01011-1
Position
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
TEST POINTS
A-4
A-2
A-4
A-3
A-3
B-5
B-2
B-2
B-2