Read Panasonic KX-NS0290CE Service Manual online
14
KX-NS0290CE
4.4.
Outline of Reset System
A reset to devices(IC501 and IC602) in this card is dominant in a reset from the main frame (MPR), and normally it is only available
for software command reset or hardware reset using RESET IC(IC801).
Shows the reset schematic diagram.
for software command reset or hardware reset using RESET IC(IC801).
Shows the reset schematic diagram.
4.5.
Power Supply
This card is supplied +15V power through the SMT connector (CN3) from the power supply unit.
The +15V power supply generates +3.3V via DC/DC converter, and they are fed as the power of circuit in the card.
Shows the system diagram of the power supply.
The +15V power supply generates +3.3V via DC/DC converter, and they are fed as the power of circuit in the card.
Shows the system diagram of the power supply.
• Protection of 3.3V output
The protection circuit consists of an output short protection and an overvoltage protection.
When an output of power supply is short, IC807 works to stop the output as the output short protection.
When +3.3V output become overvoltage caused by IC807 short (5-6pin), it is detected by D804.
When an output of power supply is short, IC807 works to stop the output as the output short protection.
When +3.3V output become overvoltage caused by IC807 short (5-6pin), it is detected by D804.
Q802
G
D
S
R804
47k
R807
33k
+15V
C802
D804
PGD
R803
2.2k
R805
1k
R810
10k
R801
47k
R802
10k
IC807
1
BST
2
GND
3
FB
4
EN
5
IN
6
SW
C818
0.01u
50
D805
R823
49.9k
R824
16.2k
C811
10u
6.3
C810
10u
6.3
C807
150u
25
C805
10u
25
C816
0.01u
50
C819
15p
50
+15V
D801
D802
Q801
1
2
3
4
5
6
+15V_F
L803
10u
L802
10u
F801
125V
3
R832
NC
C812
0.1u
50
NC
C806
0.1u
50
C817
0.1u
50
R822
100k
R835
5.6
C820
330p
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