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| TROUBLESHOOTING & REPAIR |
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| TROUBLESHOOTING GUIDE |
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| Observe Safety Guidelines | ||||||||
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| detailed in the beginning of this manual. | ||
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| PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED | |||||||
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| (SYMPTOMS) |
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| FUNCTION PROBLEMS |
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| The yellow light (PL1) on the front |
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| 1. Normal condition - this light |
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| panel is not lit. |
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| will glow only if machine is in |
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| an overheated condition. |
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| (Thermal overload). |
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| One or more keypad lights (LEDS) |
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| 1. Be sure that the proper weld |
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| 1. Check the Keypad LED board |
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| are dark and cannot be lit when |
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| mode is selected. For |
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| to the Control board harness. |
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| their respective keys are pressed - |
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| example, the high frequency |
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| The plugs may be loose or |
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| machine is operable. |
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| keys and keypad lights |
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| defective. |
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| (LEDS) are not active in the |
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| 2. If only one red LED won’t light, |
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| stick mode. |
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| the LED PC Board may be |
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| defective. Replace. |
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| 3. If three or more red LEDS do |
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| not light, the Control board may |
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| be faulty. Replace. |
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| The Beeper (Piezoelectric Buzzer) |
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| 1. Background noise may be too |
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| 1. Watch the Control Panel |
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| cannot be heard - machine operat- |
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| loud for user to hear beeper. |
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| Display to see if the keys are |
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| ing normally. |
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| responding properly to key |
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| presses. If so then the Buzzer |
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| may be defective. Replace the |
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| Piezo Electric Buzzer. HINT- |
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| The Piezo Electric Buzzer |
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| may be checked by applying |
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| a 9vdc signal to the buzzer |
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| leads. Red lead to +. Black |
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| lead to |
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| 2. The Control board may be |
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| faulty. Check for the presence |
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| of 15vdc at pins 6J6 to 13J6 at |
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| the Control board. See figure |
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| at end of this Guide. The 15vdc |
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| will be present for a very short |
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| period of time when a key is |
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| pressed. If the voltage is not |
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| present then replace the |
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| Control board. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call
