4. Turn on the machine and it
appears normal, there is
no-load voltage output in ARC
mode, press the welding torch
in TIG mode and there is gas
out, the malfunction LED is not
on, no HF.
a. The connecting cable matching socket
CON2 on top PCB PM-04-A3 with socket
CON1 on HF PCB PZ-35-A0 is in loose
connection.
b.
High voltage silicon granule
D1/D2/D3/D4 or high voltage output
capacitor C6/C7 on bottom PCB
PZ-27-A0 is damaged.
c. CP1/CP2 is disconnected with the HF
PCB.
d. The discharge nozzles P1/P2 on HF PCB
have conglutination, excessive clearance
or serious oxidation problem.
e. The ARC/TIG conversion switch on the
panel or chip U7 on control panel
PK-31-A0 is damaged.
f. The connecting cable matching socket
CON8 on control PCB PK-31-A0 with
socket CON4 on HF PCB PZ-35-A0 is in
loose connection, or HF relay RELAY1,
audion Q1, MOSFET VT1 or diode D5 on
HF PCB is damaged.
a. Check.
b. Check.
c. Check.
d. Adjust or replace it if necessary.
e. Check and replace it if necessary.
f. Check. Method: short-circuit the
socket CON4 on HF PCB
PZ-35-A0, and turn on the
machine, if no HF, the HF circuit
on HF PCB goes wrong; if there
is, the inductor L1/L2, chip U1/U3
or resistor R6 on control PCB
PK-31-A0 is damaged.
