TROUBLESHOOTING
TROUBLESHOOTING GUIDE
Observe Safety Guidelines detailed throughout this manual.
ACCESSORIES
| SYMPTOM |
| CAUSE AND REMEDY |
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| K870 Foot Amptrol or K963 Hand Amptrol. |
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| Amptrol does not control welder output with | 1. | Check continuity between pins D and E in the cable connec- |
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| Current Control switch in REMOTE and |
| tor. There should be an open circuit when the Amptrol is not |
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| Mode switch in TIG. |
| pressed and a short circuit when it is pressed part way. If this |
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| is not the case, check the Amptrol cable for breaks. The |
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| microswitch in the Amptrol may not be operating properly. |
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| Repair or replace as necessary. |
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| 2. | Using an ohmmeter, check the resistance between pins A |
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| and B in the Amphenol connector. The resistance should be |
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| 10K ohms when the pedal is up, and near zero ohms when |
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| the pedal is fully depressed. An open circuit would indicate a |
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| bad cable or defective potentiometer. Check for breaks and |
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| repair or replace the damaged cable or potentiometer. |
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| K814 Arc Start Switch |
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| Arc Start Switch does not start welder output | 1. | Check continuity between pins D and E of the cable |
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| in TIG Mode and LOCAL Current Control. |
| connector. There should be an open circuit when the switch |
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| is not pressed, and a short circuit when the switch is |
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| pressed. |
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| Check the cable for breaks, and repair or replace as |
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| necessary. Check the switch and its connections. |
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| 2. | Be sure the |
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| K846 Interface Kit |
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| Solid State Relay Module output does not close | 1. | Is the correct type of solid state relay module installed? AC |
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| when corresponding Status PC board LED lights. |
| modules work only for AC circuits, and DC modules only for |
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| DC circuits. |
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| 2. | Is the corresponding fuse (F1 for CR1, F2 for CR2, etc.) |
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| blown? If so, find cause and replace with a 4 amp fuse. |
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| 3. | Are the Interface and Status PC boards correctly mated to |
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| one another? Be sure that all 10 pins on P701 are inserted |
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| into J602 on the Status PC board. |
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| 4. | Is harness connector P601 plugged into J701 on the |
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| Interface PC board? |
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| 5. | Is Terminal Strip (TS701) wired correctly (terminals 3 and 4 |
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| for CR1, terminals 5 and 6 for CR2, etc.)? |
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| 6. | Is DC polarity of terminal strip connection correct? Odd num- |
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| bers (+), even numbers |
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| 7. | Defective solid state relay. Replace. |
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| Solid State Relay Module output seems to | 1. | High Frequency pickup may be a problem. Reroute leads |
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| make contact at wrong times. |
| going to Interface terminal strip away from welding cables |
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| which carry high frequency. |
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| 2. | Use shielded cables to make connections to the Interface PC |
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| board terminal strip. Ground the shield to terminal 1 or 2 on |
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| TS701. |
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| 3. | Be sure that the white ground lead is on the Interface PC |
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| board tab terminal and is connected to the welder chassis |
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| screw. |
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SQUARE WAVE TIG 355
