Miller Syncrowave 250 DX Technical Manual page 64

Trouble
Gas control not working properly.
Pulser not working properly in GTAW mode.
Final Slope option not working properly in GTAW
mode.
Start control option not working properly in GTAW
mode.
Spot time option not working properly in GTAW mode. Check optional timer board PC3 and connections, and replace if necessary (see Section
Preflow not working properly in GTAW mode.
Remote 14 receptacle RC1 not working properly.
No high frequency; difficulty in establishing GTAW arc. Check circuit breaker CB1, and reset if necessary (see Section 7-2).
Wandering arc − poor control of direction of arc.
Tungsten electrode oxidizing and not remaining bright
after conclusion of weld.
TM-359 Page 60
Check coil voltage and connections of gas valve GS, and replace if necessary (see Section
6-3).
Check status of diagnostic LED26 on main control board PC1. Replace PC1 if necessary
(see Section 6-6).
Check main control board PC1 and connections, and replace if necessary (see Section
6-6).
Check incoming gas pressure at gas valve GS to make sure it does not exceed 90 psi.
Check pulser board PC2 and connections, and replace if necessary (see Section 6-8).
Check optional timer board PC3 and connections, and replace if necessary (see Section
6-10).
Check optional timer board PC3 and connections, and replace if necessary (see Section
6-10).
6-10).
Check main control board PC1 and connections, and replace if necessary (see Section
6-6).
Be sure Amperage control switch and Output switch are in the Remote 14 position (see
Section 4-1).
Check remote control for pin A shorted to ground.
Check main control board PC1 and connections, and replace if necessary (see Section
6-6).
Select proper size tungsten.
Check High Frequency intensity control R5 setting (prior to LC344556).
Be sure that torch cable is not close to any grounded metal, and disconnect any unused
cables.
Check cables and torch for cracked insulation or bad connections. Repair or replace nec-
essary parts.
Check spark gaps G1, and adjust if necessary (see Section 7-3).
Check capacitor C3 for a short or open, and check for proper connections. Replace C3 if
necessary (see Section 6-3).
Check high frequency transformer T3 for signs of winding failure. Check continuity across
windings, and check for proper connections. Check primary voltages. Replace T3 if neces-
sary (see Section 6-3).
Check main transformer T1 for signs of winding failure. Check continuity across windings,
and check for proper connections. Check secondary voltages. Replace T1 if necessary
(see Section 6-3).
Reduce gas flow rate (see Section 3-9).
Select proper size tungsten.
Properly prepare tungsten.
Shield weld zone from drafts.
Increase postflow time (see Section 4-1).
Check and tighten all gas fittings (see Section 3-9).
Properly prepare tungsten.
Replace torch parts if water has leaked into torch.
Remedy
Syncrowave 250 DX