Toshiba 1997 G Series 문제 해결 매뉴얼 - 페이지 26

{카테고리_이름} Toshiba 1997 G Series에 대한 문제 해결 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Toshiba 1997 G Series 28 페이지. Color television power supply and shutdown

9. +/-15V Under Voltage Protect.

The two circuits work independantly, and do not affect

each other.

The +15V turns on transistor Q853. This causes the

collector of Q853 to stay low, about 0V. If the +15V

goes low, Q853 will turn off, and the collector will go

high, to about 5. This will pass through the diode switch,

D 866, and shut down will take place.

The -15V turns on transistor Q854. This causes the col-

lector of Q854 to go to about -15V. If the -15V goes

low, Q854 will turn off, the collector will go towards the

12V supply. Thios will pass through the diode switch,

D867, and shut down will take place.

Figure 21. +/-15V Under Voltage Protect.

JRS 12-97