Section 6 − Troubleshooting; Troubleshooting Table - Hobart Handler 190 Technical Manual

SECTION 6 − TROUBLESHOOTING

6-1. Troubleshooting Table

Trouble
No weld output; wire does not feed; fan
does not run.
No weld output; wire does not feed; fan
runs.
Wire does not feed; wire is not ener-
gized; wire feeds unevenly.
Electrode wire feeding stops during
welding.
TM-260 273 Page 20
Secure power cord plug PLG1 in receptacle (see Section 3-11).
Replace building line fuse or reset circuit breaker if open.
Place Power switch S1 in On position (see Section 4-1).
Reset power source supplementary protector if open (see Section 7-2).
Check Voltage switch S2 position. Rotate knob until it "clicks" into detent at desired range setting.
Thermostat TP1 open (overheating). Allow fan to run; the thermostat will close when the unit has
cooled (see Section 2-3).
Secure gun trigger plug to receptacle RC3 (see Section 3-2).
Be sure that Spool Gun/MIG Gun switch S3 is in correct mode (see Section 3-2 or 3-12).
Check continuity of gun trigger leads. Repair or replace gun if necessary.
Check continuity of Voltage switch S2, and replace if necessary.
Check and tighten terminal screws on Voltage selector switch S2.
Check diodes in main rectifier SR1, and replace if necessary.
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.
Check control board PC1 connections and voltages, and replace if necessary.
Check contact tip. Check for kinks in gun cable and liner.
Check gun trigger plug connection at welding power source/wire feeder.
Check, and if necessary, replace gun trigger switch (see Section 7-6).
Check contact tip. Check for kinks in gun cable. Blow out liner and gun casing (see Section 7-5).
Straighten gun cable and/or replace damaged parts (see Section 7-5).
Readjust drive roll pressure (see Section 3-13).
Change to proper groove (see Section 7-4).
Readjust wire spool hub tension (see Section 3-9).
Replace contact tip if blocked (see Section 7-5).
Clean or replace wire inlet guide or liner if dirty or plugged (see Section 7-4 and/or 7-5).
Replace drive roll or pressure bearing if worn or slipping (see Section 7-4).
Secure gun trigger plug in receptacle RC3 (see Section 3-2).
Check continuity of gun trigger leads. Repair or replace gun if necessary.
Check and clear any restrictions at drive assembly and liner (see Section 7-4 and/or 7-5).
Check T1 for signs of winding failure. Check continuity across each winding and check for proper
connections. Check secondary voltages. Replace T1 if necessary.
.
See Section 6-2 for test points and values and
Section 9 for parts location.
.
Use Miller Testing Booklet (Part No. 150 853)
when servicing this unit.
.
See the Miller Extranet for service memos that
may aid in the repair of this product.
Remedy
Handler 190