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SQUARE WAVE TIG 255 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC F-7 TROUBLESHOOTING & REPAIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. PROBLEMS (SYMPTOMS) POSSIBLE AREAS OF MISADJUSTMENT(S) RECOMMENDED COURSE OF ACTION FUNCTION PROBLEMS The yellow light (PL1) on the front panel is not lit. 1. Normal condition - this light will glow only if machine is in an overheated condition. (Thermal overload). One or more keypad lights (LEDS) are dark and cannot be lit when their respective keys are pressed - machine is operable. 1. Be sure that the proper weld mode is selected. For example, the high frequency keys and keypad lights (LEDS) are not active in the stick mode. 1. Check the Keypad LED board to the Control board harness. The plugs may be loose or defective. 2. If only one red LED won’t light, the LED PC Board may be defective. Replace. 3. If three or more red LEDS do not light, the Control board may be faulty. Replace. The Beeper (Piezoelectric Buzzer) cannot be heard - machine operating normally. 1. Background noise may be too loud for user to hear beeper. 1. Watch the Control Panel Display to see if the keys are responding properly to key presses. If so then the Buzzer may be defective. Replace the Piezo Electric Buzzer. HINT- The Piezo Electric Buzzer may be checked by applying a 9vdc signal to the buzzer leads. Red lead to +. Black lead to –. 2. The Control board may be faulty. Check for the presence of 15vdc at pins 6J6 to 13J6 at the Control board. See figure at end of this Guide. The 15vdc will be present for a very short period of time when a key is pressed. If the voltage is not present then replace the Control board. 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 216-383-2531 or 1-800-833-9353. SQUARE WAVE TIG 255 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC TROUBLESHOOTING & REPAIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. PROBLEMS (SYMPTOMS) POSSIBLE AREAS OF MISADJUSTMENT(S) RECOMMENDED COURSE OF ACTION FUNCTION PROBLEMS The control panel displays cannot be read. The characters run, display only half characters, or random dots may appear on display. None 1. Check for loose connections at plug J3 on the control board. 2. The display may be faulty. Replace. 3. The control board may be faulty. Replace. The voltmeter always reads “00” . The machine output is normal. None 1. Check the continuity of leads #305 and #313C and their connections to the machine output studs. Refer to wiring diagram. 2. The Control board may be faulty. Check for machine “open citcuit voltage” at 5J6 and 12J6 on the Control board. If open circuit voltage is present then replace the Control board. 3. If open circuit voltage is not present at 5J6 and 12J6 (see Figure F.1) then check the Protection/Snubber board. See Protection/Snubber Board Continuity Test. The control panel display background is dark instead of red. The machine operates normally. None 1. Check for loose connector (P3) at the Control board. 2. The Control board may be faulty. Disconnect P3 from the Control board. Check voltage from 1J3 to 2J3 on the board. See Figure F.1. The voltage should be 15 to 20vdc. If the voltage is not correct then replace the Control board. 3. If the Control board is good then the Display may be faulty. Replace Display. 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 216-383-2531 or 1-800-833-9353. SQUARE WAVE TIG 255 Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC F-9 TROUBLESHOOTING & REPAIR Observe Safety Guidelines TROUBLESHOOTING GUIDE detailed in the beginning of this manual. PROBLEMS (SYMPTOMS) POSSIBLE AREAS OF MISADJUSTMENT(S) RECOMMENDED COURSE OF ACTION FUNCTION PROBLEMS AC/DC Indicator on control panel display show AC when polarity switch is in the DC position, or vice versa — machine has output but balance control is not operable in the AC TIG mode. None 1. Check leads #304 and #312 for proper connections. Refer to wiring diagram 2. Check microswitch (S2A), located on polarity switch (S2), for proper operation. 3. The protection/snubber board may be faulty. See protection/ snubber board continuity test. 4. Check control transformer (T2). See control transformer voltage test. 5. If above checks are...