HIKVISION DS7208HVI-ST/SE 제품/유지보수 매뉴얼 - 페이지 18

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④. Voice Problems

Phenomenon 1: preview no voice, first without software Settings, then

measuring 100 resistance (RU9) and capacitance (CS18) impedance, or

replacement, finally ruled out TW2866 (US1) (can directly introduce audio

signal into TW2866 chip audio input PIN 6, to rule out the chip is normal or not)

Phenomenon 2: voice talkback AOUT no output, measuring 3.9 K resistance

(RS60) + 560 Europe resistance (RP24) resistance, or replacement, finally ruled

out TW2866 (US1) (directly lead AOUT signal from the TW2866 chip PIN2, to

exclude the chip is normal or not)

⑤.RS485 Failure

Step 1: the first to exclude thermistors JK250 (RPT1/2/3/4)

Step 2: measurement TVS tube B03NC (BA5/6/7/8), HK-4 (D2/3/4/5)

impedance, or replacement

Step 3: measurement SP491EEN 9 and 10 feet chip difference voltage (normal

close to 5 V), or replacement

⑥. Internet Links

Network light and network data transmission light are flashing



Step 1: first measurement RTL8201 chip PIN 36 input voltage 3.3V is normal, or

to measure WCX (FBN1) impedance, or replacement

Both network light and network data transmission light not bright



Step one: first measurement 25 M (Y3) crystal, or replacement

Step two: replace RTL8201

Both network light and network data transmission light are nomal



Step one: first replace RTL8201, and then ruled out MS10232, U2.8

⑦.SATA Hard Dish Fault

Step one: first measurement BD9329(U2) PIN 3 power output voltage wheather 5V or short

circuit, or replacement