HIKVISION DS7208HVI-ST/SE Product/Maintenance Manual - Page 20
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Schedule: 1 Crystal Effect
Serial
number
1
2
3
Schedule:2 Voltage Effect
The serial
number
1
2
3
Crystals
27M（Y4）
TW2866 chips work clock (82 feet input 27 M)
25M（Y3）
24M（Y1）
KY2010 system startup clock, and integrated USB
module clock
Power chip
BD9328 （U1） 2 feet enter 12 V, 3 feet output 5 V, mainly used for
other components provide normal work voltage
BD9328 （U5） 2 feet enter 12 V, foot 1 output 1.0 V, mainly for the
KY2010 system start working voltage
BD9328 （U3） 2 feet enter 12 V, 3 feet 3.3 V, mainly used for other
components provide normal working voltage, power
of MP8904 turn 1.2 V output
BD9328 （U4） 2 feet enter 12 V, foot 1 output 1.8 V, mainly for the
KY2010 system working voltage and DDR2 memory
work voltage
BD9329 （U2） 2 feet enter 12 V, 3 feet output 5 V, mainly for the
SATA hard disk normal power
MP8904
feet 8 input 3.3 V, foot 1 output 1.2 V, mainly for the
TW2866 chip normal working voltage
（UV3）
Action (devices work clock)
RTL8201 chips work clock
function (devices working voltage)