HIKVISION DS7208HVI-ST/SE Manual de producto/mantenimiento - Página 19

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⑧. Clock Fault

Step one: the first to rule out the battery (normal voltage 3.3 V), and then ruled

out 8563 T, 32768 HZ, diodes

⑨.VGA Output Color Devation

Step 1: measuring 75Ω resistance (RG4/5/6), or replacement

Step 2: measurement BAV99 (Q3/ 7/8) PIN 3 impendance to GND, or

replacement

Step 3: rule out 6303 chip

⑩.USB Fault

Step one: measurement SESR05 (QA1 or QA2) 2, 3 feet voltage difference

value (normal voltage difference about 3.05 V), as well as the impedance to the

GND, or replacement

Note: SESR05 (QA1 or QA2),front and after USB interface is independent of

each other

SESR05 （ QA2）

SESR05（QA1）