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| TROUBLESHOOTING & REPAIR |
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| TROUBLESHOOTING GUIDE | Observe Safety Guidelines | |
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| detailed in the beginning of this manual. | |
PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED | ||
(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION | ||
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| FUNCTION PROBLEMS |
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The Pulsar does not seem to | 1. | If the Start controls are used, | 1. | Check the Pulse controls (R18, |
operate. |
| pulsing does not begin until |
| R19 and R20) for correct resis- |
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| the end of the “start” time, |
| tance and proper operation. |
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| which can be as much as 10 |
| See Wiring Diagram. |
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| seconds. | 2. The control board may be | |
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| 2. | Check the Pulses Per Second |
| faulty. Replace. |
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| control. If it is set near mini- |
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| mum, each pulse may be as |
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| long as ten seconds. Set all |
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| three of the pulse controls near |
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| the midpoints to see the |
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| pulser’s effects. |
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| 3. The Pulse % On control may |
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| be set at either extreme. If |
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| that is the case, the pulses |
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| may be too short to be seen. |
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The Spot Timer does not last as | 1. | When in the | 1. | Check the Spot Timer control |
long as the nameplate setting. |
| mode, be sure to keep the Arc |
| potentiometer (R16) for correct |
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| Start switch or Amptrol |
| resistance and proper opera- |
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| pressed until the spot time is |
| tion. |
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| completed. Releasing the Arc | 2. The control board may be | |
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| Start switch before the Spot | ||
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| faulty. Replace. | |
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| Timer has timed out will cause |
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| the arc to go out. |
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The Spot Timer lasts much longer | 1. | Make sure the Crater Fill | 1. | Check the Spot Timer control |
than the nameplate setting. |
| switch is turned off. If it is on, |
| potentiometer (R16) for correct |
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| the actual weld time will be the |
| resistance and proper opera- |
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| spot time plus the crater fill |
| tion. |
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| time. | 2. The control board may be | |
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| faulty. Replace. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
SQUARE WAVE TIG 355
