Acer AL2016 서비스 매뉴얼 - 페이지 9

{카테고리_이름} Acer AL2016에 대한 서비스 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Acer AL2016 45 페이지. Al2016w service guide
Acer AL2016에 대해서도 마찬가지입니다: 매뉴얼 (11 페이지)

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3.2 Protection circuit

Over Voltage Protection: C503, C505and C506 are connected in high voltage output connector,

the divided AC voltage is inverted DC voltage through D503, R523and C533 are used to rectify wave

& dump noise. Then the voltage signal reaches Pin9 VSEN of IC501, when the voltage changes,

build-in PWM of IC501 will adjust output voltage.

Open Lamp Protection: In normal operation, the test points of OP1, OP2, OP3, OP4, OP5, OP6

are sensed a high level AC voltage, the AC signal, for example OP1 invert DC voltage through R531,

C540, so the high level DC voltage reaches the gate pin of Q502, So the gate pin of Q501 has a low

level voltage, and the IC501 is normal operation. Once one of signal OP1, OP2, OP3, OP4, OP5 and

OP6 is low, the voltages of Q501 gate pin is high level, and make the voltage of ISEN low level, the

IC501 will be shunt down.

Service Manual