Read Panasonic KX-MB2110RUW / KX-MB2130RUW / KX-MB2170RUW / KX-MB2117RUB / KX-MB2137RUB / KX-MB2177RUB (serv.man6) Service Manual Supplement online
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KX-MB2110RUW/KX-MB2130RUW/KX-MB2170RUW/KX-MB2117RUB/KX-MB2137RUB/KX-MB2177RUB
1.4.
Troubleshooting Guide
1.4.1.
Troubleshooting Details
1.4.1.1.
Low Voltage Power Supply Board (SMPS Board)Section
1.4.1.1.1.
Key Components for Troubleshooting
Changed from the Original Service Manual section 12.3.23.1.
Check the following parts first: F1, F101, RC1, C2, Q1 and IC1.
This comes from our experience with experimental test. For example: power supply and lightning surge voltage test, with standing
voltage test, intentional short circuit test, etc.
Caution:
This comes from our experience with experimental test. For example: power supply and lightning surge voltage test, with standing
voltage test, intentional short circuit test, etc.
Caution:
If you find a melted fuse in the unit, do not turn on the power until you located and repair the faulty parts (except for the fuse);
otherwise the fuse will melt again and you cannot pinpoint the faulty point.
otherwise the fuse will melt again and you cannot pinpoint the faulty point.
In most cases, the symptom is that nothing is output. It is more likely that the fault is in the primary side rather than the secondary
side. Check the primary side first.
side. Check the primary side first.
: Volt Meter
7 +24V
3 +12V
2 HTRCTL
1 NC
6 +24V
5 GND
4 GND
V
21.6V-27.6V
V
6.5V-13.2V
220
4W
120
3W
V
When you check voltage in
a power supply unit alone,
use this dummy load.
If the dummy load is not
available, connect the main
P.C.B. to the analog P.C.B.
a power supply unit alone,
use this dummy load.
If the dummy load is not
available, connect the main
P.C.B. to the analog P.C.B.
DUMMY LOAD to check voltage
Input
Circuit
Circuit
AC
Input
Input
RC1
VDD
G
H
24V
Kick-on
Voltage
Circuit
Voltage
Circuit
E
F
12V
HTRCTL
GND
Control
Circuit
Circuit
Converter
Circuit
Circuit
C
D
Rectifier
Circuit
Circuit
A
B
+
Error Detecting
Circuit PH1
Circuit PH1
O.C.P
O.L.P
Q1
A-B Voltage Wave Form
C-D Voltage Wave Form
E-F
G-H Voltage Wave Form
0
0
0
T1
Triac
CR1
CR1
Heat Lamp
Photo Triac
Coupler PHT1
Coupler PHT1
Block Diagram
+
+
C2
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