Read Panasonic KX-NS8290CE Service Manual online
17
KX-NS8290
4.10.3. Power Supply Interruption Backup Circuit
To avoid unexpected system down due to power supply interruption, Legacy Adaptor has internal backup capacitor.
4.10.4. Power Supply Interruption Detection Circuit
Item
Specification
Remark
Capacitor
1000000uF x 3
Charge Voltage
6.1V
Backup Time
300ms
Power interruption period is defined at AC-Adaptor input point
Item
Specification
Remark
PoE Low Voltage Detection
Zener Voltage : 8.2V
PoE Normal Input : 12V
DC-In Low Voltage Detection
Zener Voltage : 5.6V
DC-In Normal Input : 9V
C660
DG
C656
4
OUT2
1
ADJ
2
OUT1
C657
DG
DG
DG
DG
DG
D651
D652
VBAT_PWR
VBAT
R659
R660
R665
R664
R663
R661
R666
R657
R658
D653
C659
C664
C658
D505
C655
IC651
3
IN
DG
D601
MAIN_PWR
From PoE Circuit
From DC -IN
Mega Capacitor
From PoE Circuit
From DC
-
In
DG
PDN
003
D600
Q600
10K
10K
D605
D604
+3.3V
R604 4.7k
R603
10k
D602
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