Sylvania 6509DD Service Manual page 51

Main CBA Top View < TV Section >
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.
D1311 Cathode
(C-Trap Adjustment)
1-10-25
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.
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.
TP1303
GND
MAIN CBA
Ref No. Position Ref No.
ICS TRANSISTORS
B-2
IC1201 Q1621
B-2
IC1202 Q1622
IC1451 A-3 Q1623
A-4
IC1452 Q1625
F-2
IC1601 Q1731
IC1602 E-4 Q1732
IC1603 C-5 Q1733
IC1604 D-4 Q1734
A-4
IC1731 Q1736
A-1
IC1801 Q1737
TRANSISTORS Q1738
D-2 CONNECTORS
Q1261
Q1282 B-3 CN1302
VR1601
C-1
+B ADJ Q1301 CN1601
Q1350 A-2
CN1602
Q1453 B-3 CN1603
B-4
Q1454 CN1731
Q1601 E-2 CN1801
Q1602 F-2 CN1802
TEST POINTS
Q1604 F-3
Q1605 D-3 TP1301
Q1606 D-3 TP1302
Q1607 D-3 TP1303
Q1608 E-3 TP1401
Q1609 D-3 TP1402
Q1610 D-4 TP1731
Q1611 D-3 TP1732
Q1612 D-4 TP1733
Q1613 D-2 TP1734
VARIABLE RESISTOR
Q1614 E-4
Q1616 D-2 VR1601
Q1619 C-3
1-10-26
Position
C-4
C-4
C-4
C-4
F-4
D-4
F-4
F-4
D-5
D-5
D-5
C-1
D-1
F-4
B-5
C-5
A-1
A-5
F-5
E-2
F-4
A-5
A-5
D-5
E-5
D-5
D-5
F-3
BTD700F01011