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LINCOLN ELECTRIC
AUXILIARY RECTIFIER (D4) 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 determine if the Auxiliary Rectifier (D4) is functioning properly.
MATERIALS NEEDED
Volt/Ohmmeter
Wiring Diagram
TEST PROCEDURE
1. Carefully remove input power from the FlexCut 200 machine.
2. Perform the Case Cover Removal Procedure.
3. Perform the Capacitor Discharge Procedure.
4. Locate the auxiliary rectifier (D4), on the top shelf at the vertical flange of the horizontal divider.
See Figure F.18. See Wiring Diagram.
5. Label and disconnect leads POS, NEG, X13B and X14A from the auxiliary rectifier (D4). See Figure
F.19. See Wiring Diagram.
6. Using a digital volt/ohmmeter, perform the diode drop tests outlined in Table F.3. See Figure F.19.
See Wiring Diagram.
7. If any of the tests fail, the auxiliary rectifier (D4) may be faulty.
8. If faulty, perform the Auxiliary Rectifier (D4) Removal And Replacement Procedure.
9. Connect leads POS, NEG, X13B and X14A to the auxiliary rectifier (D4). See Wiring Diagram.
10. Perform the Case Cover Replacement Procedure.
TEST POINT (POS)
TOP AC TERMINAL
BOTTOM AC TERMINAL
NEGATIVE TERMINAL
NEGATIVE TERMINAL
Table F.3 – Auxiliary rectifier (D4) diode drop tests
TEST POINT (NEG)
POSITIVE TERMINAL
POSITIVE TERMINAL
TOP AC TERMINAL
BOTTOM AC TERMINAL
FlexCut® 200 Service Manual
EXPECTED READING
0.3 VDC – 0.7 VDC
0.3 VDC – 0.7 VDC
0.3 VDC – 0.7 VDC
0.3 VDC – 0.7 VDC
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Troubleshooting
