Lincoln Electric V155-S - Manual (Page 46)

DC+
DC-
INPUT BOARD
D1 Input Rectifier
R4
R2
~
~
+
–
FIGURE F.5 – INPUT BOARD TEST POINTS
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 F-14 F-14
INVERTEC® V155-S
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