Lincoln Electric INVERTEC V300-PRO SVM105-B Service Manual page 62

F-32
TEST PROCEDURE
1. Locate the Output Terminals on front panel.
2. Remove any cables from Output Terminals.
3. Test for more than 200 ohms resistance between
positive and negative Output Terminals:
meter lead to the positive terminal, negative meter
lead to the negative terminal.
NOTE: Polarity of test leads is important.
a. If reading is more than 200 ohms, Output
Diodes are OK.
TROUBLESHOOTING & REPAIR
OUTPUT DIODE TEST (cont.)
positive
FIGURE F.10 — TESTING OUTPUT DIODES.
LINCOLN
-
V300-PRO
b. If reading is less than 100 ohms, one or more
Output Diode is shorted. Test all Output Diodes
(D-1 thru D-12) or diode modules individually.
NOTE: On codes prior to 10200 the diodes should
also be tested individually to check for "Open"
diodes. An open diode may cause an imbalance
condition when output is activated. Be sure to per-
form the Input Filter Capicitor Discharge
Procedure as detailed in this section.
+
F-32