TROUBLESHOOTING | ||
| Observe all Safety Guidelines detailed throughout this manual |
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PC BOARD TROUBLESHOOTING GUIDE - FIRING P.C. BOARD
1.All 10 LED’s must be ON when the POWER SOURCE is turned ON and the wire feeder’s trigger is closed, or a jumper is placed between 2 & 4, or the “OUTPUT TERMINALS SWITCH” is in the ON position.
2.LED’s 7, 8, and 9 indicate AC power being supplied to the P.C. board from auxiliary windings (T1). If a light is not on, turn the machine off and unplug P5 from the firing board. Turn the machine back on and check the fol- lowing voltages:
Light that was off | Check AC voltage between | Voltage should be approximately | ||
7 | P5 pins 15 | & 16 (wires 230,204) | 32VAC | |
8 | P5 pins 7 | & 8 (wires 205,206) | 32VAC |
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9 | P5 pins 5 | & 6 (wires 207,208) | 32VAC | |
3.If all voltages are present, turn power off, and plug P5 back into J5. Turn power back on. If LED’s are still out, replace firing PCB.
4.If voltages were not present then check the wiring back to the auxiliary windings for a possible open.
5.LED’s 1 through 6 indicate gate signals are being sent to the main SCR’s 1 through 6 respectively If LED5 is on (CONTROL BOARD), along with LED7, 8, and 9 on firing PCB, and LED’s 1 through 6 are not on, check to make sure lead 231 between control board and firing board is not broken.
6.If any one of LED 1 through 6 are not on and LED’s 7,8, and 9 are on, replace the firing PCB.
PC BOARD TROUBLESHOOTING GUIDE - CONTROL P.C. BOARD
1. | LED1 | indicates that the CC mode switch is closed. When the CC mode switch closed LED6 should also illu- | |
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| minate. See LED6. |
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2. | LED2 | indicates that there is feedback voltage present in CV mode. | |
3. | LED3 | indicate an input shutdown. Refer to Remote Control Leads Fault Protection Shutdown and | |
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| Shorted Rectifier Fault Protection or Idle Shut Down Timer in the Operation section. | |
4. | LED4 | indicates an over current fault shutdown. | Refer to Overcurrent Protection Shutdown in the |
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| Operation Section. |
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5. | LED5 | Indicates Output Current should be present. |
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6. | LED6 | indicates that the machine is in CC mode. | This LED should light whenever LED1 lights. If not the |
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| Control PC Board may be faulty. |
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7. | LED7 | +16V power supply |
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8. | LED8 | indicates the Control PC Board is signalling the Firing PC Board to fire the SCRs. | |
9. | LED9 |
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10.LED10 indicates that 42V input is present to the Control PC Board
11.LED11 indicates that there is feedback voltage present in CC mode.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.