SYLVANIA DWT1905
Manual de Servicio

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

4A/125V

CAUTION ! : For continued protection against risk of fire, replace only with same type 4 A, 125V fuse. ATTENTION : Utiliser un fusible de rechange de 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.
MAIN CBA Ref No. Position ICS IC31 B-1 IC111 D-1 IC151 E-2 IC551 B-2 IC601 C-4 IC801 E-1 TRANSISTORS Q31 C-1 Q111 E-2 Q321 C-1 Q571 B-3 Q572 B-2 Q601 B-4 Q602 B-4 Q662 Q671 Q675 C-3 C-3 C-2

FOCUS-VR (UPPER SIDE)

SCREEN-VR (LOWER SIDE) TP300 GND

Q676 C-2 Q681 D-3 Q682 D-3 Q683 D-3 CONNECTORS CN571 A-3 CN691 C-4 CN801 D-1 WH301A C-2 WH501A A-2 TEST POINTS TP300 A-3 TP601 A-4 VARIABLE RESISTOR VR661 A-1

VR661 +B ADJ

3-4

BL2300F01011-1