SYLVANIA SST4131
Manual de Servicio

Main CBA Bottom View

CAUTION ! Fixed voltage 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.

4A/125V

CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE. ATTENTION : POUR UNE PROTECTION CONTINUE LES RISQES D'INCELE N'UTILISER QUE DES FUSIBLE DE MEMO TYPE. RISK OF FIRE-REPLACE FUSE AS MARKED.
"This symbol means fast operating fuse." "Ce symbole reprèsente un fusible à fusion rapide."

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

WF8 Q571 Base

ICS IC101 E-1 IC151 E-2 IC333 D-1 IC551 A-1 IC601 C-3 IC801 E-1 TRANSISTORS Q111 D-2 Q571 A-2 Q572 B-1 Q601 B-3 Q602 C-3 Q662 C-2 Q671 C-2 Q676 C-2 Q681 D-2 Q682 C-2 Q683 B-1 Q831 D-1 TEST POINTS J121 A-2 J122 A-2 TP300 A-3 TP301 A-1 TP302 A-2 TP601 B-3 CONNECTORS CN301 A-1 CN571 A-2 CN691 C-3 CN801 D-1 WH301A C-1 WH501A A-2 VARIABLE RESISTORS VR661 A-1

WF9 PIN 1 OF CN571 WF12 PIN 4 OF CN571 WF10 PIN 3 OF WH501A

WF11 PIN 7 OF IC551

WF1 PIN36 OF IC301

WF2 WF6 PIN 40 PIN50 OF IC301 OF IC301

WF7 Q572 Collector

WF16 PIN 8 OF TU1

1-4

1-5

1-6

BL1400F01012-1