Output Board Test Procedure - Lincoln Electric Tomahawk 1500 Service Manual

LINCOLN ELECTRIC

OUTPUT BOARD TEST PROCEDURE

Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized
repairs performed on this equipment may result in danger to the technician or machine operator and will
invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety
notes and precautions detailed throughout this manual. If for any reason you do not understand the test
procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department
for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
TEST DESCRIPTION
This test will aid the technician to determine if the Output Board is receiving the correct input voltages and
if the Output Board is producing the correct output signals. This test will NOT determine the functionality
of the entire board.
MATERIALS NEEDED
Volt/Ohmmeter
Torx Nutdriver (Size T-20)
Wiring Diagram
TEST PROCEDURE
1. Remove the input power from the Tomahawk 1500 machine.
2. Perform the Case Cover Removal And Capacitor Discharge Procedure.
3. Locate the output board. See Figure F.18. See Wiring Diagram.
4. Apply the correct input power to the machine and carefully perform the voltage checks detailed in
Table F.8. See
5. Visually verify that LED 1 is illuminated. See
supply from the input board. If 15 VDC is not present, check connections from input board and
perform Input Board Test
6. Remove the input power to the machine.
7. Using a Torx nutdriver (size T-20), carefully remove the following leads from the output board. See
Figure F.19. See Wiring Diagram. Label leads for reconnection. Make sure the input capacitor is
discharged.
• Two output choke leads from terminals B7 and B8.
• Two transformer leads from terminals B6 and B5.
8. Perform the tests detailed in
9. Disconnect the leads from terminals B1 and B2 of the output board. See Figure F.19. See Wiring
Diagram.
10. Using a volt/ohmmeter, check the resistance across the resistor module; it should be approximately
100 ohms. See Figure F.19. See Wiring Diagram.
11. When testing is complete, remove input power and replace all leads and plugs previously removed.
See the Wiring Diagram.
Figure F.19 and F.20.
procedure.
Tables F.9
Figure F.19. See Wiring Diagram. This is the 15 VDC
and F.10. See Figures F.19
Tomahawk® 1500 Service Manual
and F.20.
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