Clock Module; Voice Talkback Module - HIKVISION DS7208HVI-ST Product/Maintenance Manual

5.7. Clock Module

Clock control chip: 8563 T

32768 HZ: 8563 T reset the clock

Battery: External Battery, normal voltage 3.3 V

Diodes (DG1, DG2, DG3) : DG1 connects to 3.3 V voltage, DG2, DG3

Battery are connected at one end, when the mainboard electricity, DG2,
DG3 globe, DG1 conduction, Battery don't power supply; When the
mainboard power cuts, in turn, the Battery power supply, DG2, DG3
conduction, DG1 deadline
The clock module component

1
8563T
2
UL4
3
4
32768HZ

5.8. Voice Talkback Module

Voice talkback module main control chip: TW2866 (US1), PIN 2 through 3.9

K resistance (RS60) + 390Ωresistance (RP24) output Aout
Voice talkback module part:

3.3V
DG1
DG2
8
7
6
5
X1
32768Hz
8563T
Diode
Battery
DG3
BATTERY
3.3V