PART V TROUBLESHOOTING
5-4
ENGLISH
Fig. 5.1.3-5 Disconnect all the connections to the main
circuit board except the power cord and negative ion
connection. Start the unit by closing the interlock
switches.
1-Power cord connection
2-High voltage power supply connection
3-UV lamp cord connection
4-Fan motor connection
5-Negative ion generator connection
Fig. 5.1.3-6 Connect the power supply connection to
the main circuit board, the UV lamp and fan motor
connections are still unplugged. Try to operate the unit
by closing the interlock switches with electrical tape.
1-Power cord connection
2-High voltage power supply connection
3-UV lamp cord connection
4-Fan motor connection
5-Negative ion generator connection
Fig. 5.1.3-7 Connect the UV lamps connection to the main circuit
board and check the fuse. If the fuse is blown out the UV lamp
ballast is damaged. You need to replace it.
1-Power cord connection
2-High voltage power supply connection
3-UV lamp cord connection
4-Fan motor connection
5-Negative ion generator connection
After replacing the damaged fuse, the new fuses are still blown again as soon as the unit is plugged in.
As you replace the blown fuse with a new one and try to operate the unit, you find the new fuse is still blown out with
unknown reasons. To fix this problem, you have to spend time to check all the electrical wires in the unit.
- Check if the power cord wire jackets are damaged. The damaged wires will cause a short circuit between them or the
damaged Live line may touch the unit metal casing to cause a short circuit. You can use ohmmeter to check if the
wires are short circuited.
- Check if the interlock switch is broken and there is a short circuit between the wires and parts around it.
- Check if the main circuit board connection wires are short circuited.
If you find any wire short circuit, you will need to change the wires.
After replacing the fuse, the unit is on with indicator lights on the display panel but when you try to operate the
unit by pressing the buttons the fuse is blown out again.
To fix this problem, you can proceed with the following steps.
Check the main circuit board
- Open the bottom plate.
Remember to discharge the unit power contact terminals by creating a short circuit.
- Unplug the connections of fan motor, UV lamp and high voltage power supply from the main circuit board and try to
start the unit by pressing the POWER button. If the fuse is still blown out, you need to replace the main circuit board
(Fig. 5.1.3-5). See
6.6 REPLACE THE MAIN CIRCUIT BOARD
.
If the fuse is OK, you need to go ahead to check other
connections to the main circuit board.
Check the power supply
-Connect the high voltage power supply connection (2#) to the main circuit board and start the unit by pressing the
POWER button on the control panel (Fig. 5.1.3-6). If the fuse is blown out again you need to replace power supply. See
6.3 REPLACE THE POWER SUPPLY
.
If the fuse is OK, go ahead to check the other connections.
5
1
3
2
4
5
1
3
2
4
5
1
3
2
4
Check the UV lamp ballast
Connect the UV lamps terminal (3#) to the main circuit board and start the unit by pressing the POWER button on the
control panel (Fig. 5.1.3-7). If the fuse is still blown out you need to replace the UV lamp holder (ballasts). See
6.2
REPLACE UV LAMP AND UV LAMP HOLDER
. If the fuse is OK, go ahead to check the fan motor connection.
Transformer connection
While the unit is on, do not touch
any electrical wires with hands,
especially the main circuit board,
power supply circuit board and
the unit power contact terminals!
WARNING
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