8. Turn on the machine but it
strips.
a. The rectifying bridge matching the socket
CON2/CON4/CON5 on bottom PCB
PZ-03-B0 is damaged.
b. The power supply cable is disconnected
or short-circuited.
a. Replace.
b. Check.
9. When in TIG mode, adjust
the value of the decay
potentiometer to the maximum
and release the welding torch
switch, the gas valve shuts off,
and no current output.
a. The diode D1/D2 or chip U3 on control
panel PK-10-A1 is damaged.
a. Check and replace it if necessary.
10. Press the welding torch
switch, there is HF discharge
buzz, but no welding voltage
output.
a. The earth cable of welding torch is in
loose connection.
b. The output terminal of the earth cable is
in loose connection with gas-electricity
tie-in.
a. Check and replace it if necessary.
b. Check and replace it if necessary.
11. The arc starting is bad in
TIG mode.
a. The space between discharge nozzles
P1 and P2 on HF PCB PZ-34-A0 is too
big or small, or their surface is badly
oxidized.
b. The high-voltage capacitor C3/C4 on HF
PCB is damaged, or the capacitance
becomes smaller.
c. The tungsten is of bad quality or argon is
impure.
d. The welding torch is loose or broken.
e. Incorrect turn rate or turn-to-turn
electricity leakage problem exists in
arc-starting coil matching CP1/CP2 on
HF PCB.
a. Adjust the space between them,
or clear their surface.
b. Check and replace it if necessary.
c. Check and replace it if necessary.
d. Check.
e. Check.
