6. The fuse is blown
fuse holder
filter pcb
AC19V
AC21V
transformer
input AC220V
AC220
V
Troubleshooting
Picture 3 Picture 2 Picture 1
1.Damaged fuse
2.Filtering pcb short circuited
3.Transformer short circuited
4.Mainboard damaged or short
circuited
5.Connected parts short circuited,
such as motor,air valve.
6.Power board short circuited
1.First, make sure the fuse is burned out. and replace the fuse with the same type if the
voltage fluctuations cause the fire to burn out.
2.If the fuse continues to burn out, unplug the red plug and power on, if fuse burns again
then replace a filter pcb.
3. If not, power off and re-plug the red plug, then unplug the AC19V&AC21V plug and
power on, if fuse burns out, that means transformer short circuited, just replace with a
new one.
4.If not, power off and re-plug AC19V&AC21V plug , then unplug the rest of plugs on
the mainboard and power on; if fuse burns out, replace with a new mainboard;
5.If not, re-plug all plugs one by one to check which connected part short circuited.
Replace with a new part upon confirmation of the short circuited parts.
Analysis of causes： Method of exclusion:
Tips: Transformer or filter pcb
short circuited are the main reason
for blown fuses.
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