HIKVISION DS7208HVI-ST/SE Product-/onderhoudshandleiding - Pagina 17

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②. No VOUT Output

Step 1: measurement HK-5 (TVS9) whether short circuit, or replacement

Step 2: measuring 75Ωresistance (RS117) impedence, or replacement

Step 3: monitor's signal lines connected to the probe, directly from SGM9111

(US7) chip PIN 4 draw out the VOUT signal, or replacement

Step 4: measuring 75Ω resistance (RS188), or replacement, and then monitor's

signal lines connected to the probe, directly lead CVBS -VOUT signal

from 75Ω resistance (RS188) end, or KY2010 ruled out

③. Image Problem

Phenomenon 1: there is no video signal, first exclude HK-5 (TVS1-8) whether

short circuit, or replacement; Measuring 75Ω(RV1-8) resistance, or

replacement, and then ruled out 100Ωresistance (RU1-8); Finally ruled out

TW2866 (can directly introduce video signal into TW2866 chip video input

end,PIN13/17/21/25, to rule out the chip is normal or not)

Phenomenon 2: a few channel image black screen, first rule out the software

settings, otherwise introduce video signal into TW2866 chip video input end,PIN

13/ 17/21/25, to rule out the chip is normal, or replacement

Phenomenon 3: all black and white images or flower screen, to rule out 27 M

(Y4), then rule out software, or change TW2866

CG1， CG2