Kemppi MasterTig 3500 Service Manual page 19

DISTURBANCE
The power source will not deliver
full power
The power source will not
operate on TIG
TIG-spark ignition doesn´t work.
Scratch ignition method is OK.
On MMA the machine works
OK.
POSSIBLE CAUSE
A net fuse has blown
Faulty supply cable
Faulty main switch
Faulty primary side power semi-
conductor
Faulty control card A001
Faulty main circuit card
Faulty secondary unit
Faulty main transformer
Faulty control card A002
(Mastertig)
Faulty flat cable between
control cards A001 and A002
Check power source´s operation on MMA. Disconnect the flat cable
from control card A001 and connect a shortcircuit loop to the flat cable
connector X3, between pins 1 and 2. If the power source doesn´t work
on MMA , then the TIG process can not work either.
Faulty flat cable between control
cards A001 and A002
Faulty control card A002
Faulty flat cable between control
cards A001 and A002
Faulty control card A002
Faulty control card A004
(2800/3500)
REMEDY
Check the net fuses
Check the supply cable condition
Check the main switch condition
Check the primary rectifier and
IGBT-module
Check the correct pulse ratio
adjustment from control card A001
to IGBT gate (see pages 12 and 15)
Check the main circuit card
capacitors and their connections
Check the condition the secondary
diodes
Check the main transformer ferrites
Check the flat cable signals
between control cards A001 and
A002; pins 1 and 2 against the
card´s GND (see pages 28 and 29)
Check the flat cable´s condition
(see page 23)
Check the flat cable condition
(see page 23)
Check control card condition
(see pages 28 and 29)
Check the flat cable condition
(see page 23)
Check the control card A002
condition
(see pages 28 and 29)
Check the control card A004
condition (see page 30)
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