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LINCOLN ELECTRIC
INPUT 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 Input Board is receiving the correct input voltages and is
producing the correct output voltages. This test will NOT determine the functionality of the entire board.
MATERIALS NEEDED
Volt/Ohmmeter
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 input board. See Figure F.9. See Wiring Diagram.
4.
Apply the correct input power to the machine and carefully check the status LED lights on the input
board. See
Table F.2
5.
Carefully perform the voltage checks detailed in
6.
When testing is complete, replace all leads and plugs previously removed. See the Wiring Diagram.
7.
If any of the tests fail, the input board may be faulty.
8. Remove the input power from the Tomahawk 1500
9.
If faulty, perform the
10. Perform the Case Cover Replacement Procedure.
AC INPUT VOLTAGE
SINGLE PHASE
250 VAC
250 VAC
250 VAC
250 VAC
250 VAC
and
Figure
F.10.
Input Board Removal And Replacement
Table F.2 – Input board status LED light table
LED
EXPECTED
NUMBER
STATUS
LED #1
ON-GREEN
LED #2
ON-GREEN
LED #3
ON*-GREEN
LED #4
ON*-GREEN
LED #1
ON*-GREEN
Tomahawk® 1500 Service Manual
Table
F.3. See
Figures F.10
machine.
Procedure.
COMMENTS / CONDITIONS
+15VDC IS PRESENT.
+15VDC SECONDARY IS PRESENT.
WHEN "BUCK" SIGNAL IS OPERATING. *DEPENDANT ON
INPUT VOLTAGE.
WHEN "BOOST" SIGNAL IS OPERATING. *DEPENDANT
ON INPUT VOLTAGE.
*LOCATED ON BUCK/BOOST CONTROL MODULE.
+15VDC PRESENT ON BUCK/BOOST CONTROL MODULE.
and F.11.
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Troubleshooting
