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OM-353 Page 28
Trouble Remedy
Fan not operating. NOTE: fan only
Check and remove anything blocking fan movement.
runs when cooling is necessary.
Have Factory Authorized Service Agent check fan motor.
Unit provides only maximum or
minimum weld output.
Have Factory Authorized Service Agent check control board PC1.
Weld output always above or always
below set value.
Have Factory Authorized Service Agent check control board PC1 and hall device HD1.
Erratic or improper weld output. Use proper size and type of weld cable (see Section 3-7).
Clean and tighten all weld connections.
Check position of Output Selector switch (see Section Figure 4-1).
Have Factory Authorized Service Agent check control board PC1 and hall device HD1.
No AC Balance control. Have Factory Authorized Service Agent check AC Balance control and control board PC1.
No control of weld output. If using remote control, place Output switch in Remote 14 position, and make sure remote control is
connected to Remote 14 receptacle. If remote is not being used, place Output switch in On position.
Have Factory Authorized Service Agent check Amp Adjust control and control board PC1.
No high frequency, no gas flow, and no
115 volts ac output from duplex
receptacle.
Reset circuit breaker CB1 (see Section 5-2).
Lack of high frequency; difficulty in
Select proper size tungsten.
starting GTAW arc.
Check High Frequency control setting (see Figure 4-1).
Be sure electrode holder cable is not close to any grounded metal.
Check cables and torch for cracked insulation or bad connections. Repair or replace.
Check spark gaps (see Section 5-3).
Wandering arc – poor control of
Reduce gas flow rate.
direction of arc.
Select proper size tungsten.
Properly prepare tungsten.
Tungsten electrode oxidizing and not
Shield weld zone from drafts.
remaining bright after conclusion of
weld.
Increase postflow time.
Check and tighten all gas fittings.
Properly prepare tungsten.
Check for water in torch, and repair torch if necessary. See torch Owner’s Manual.