Input Board Resistance Test - Lincoln Electric INVERTEC V155-S Service Manual

F-14
INPUT BOARD RESISTANCE TEST (CONTINUED)
PROCEDURE
1. Disconnect power to the INVERTEC® V155-S.
2. Perform the Case Cover Removal Procedure.
3. Perform the Input Filter Capacitor Discharge
Procedure.
4. Visually check for burned areas ont The Input Board
(solder side).
5. Disconnect the Blachk lead from the DC- terminal.
6. Check the Input Rectifier Bridge "D1".
7. Check start resistors "R2" and "R4". Each should
read 20 Ohms. See Figure F.5.
TROUBLESHOOTING & REPAIR
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FIGURE F.5 – INPUT BOARD TEST POINTS
~
–
+
~
INVERTEC® V155-S
R2
R4
F-14