Lincoln Electric SVM153-A service manual Check Diode Module, When all tests are complete

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F-49	F-49
	TROUBLESHOOTING & REPAIR

POWER MODULE TEST (CONTINUED)

FIGURE F.23 – DIODE MODULE TEST

HEAT SINK

DIODE

MODULE

TERMINALS

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Check Diode Module

9.Using the analog ohmmeter, connect the negative meter probe to the terminal on the diode module. See Figure F.23. Connect the positive meter probe to the heat sink. The resistance should be very high (over 50,000 ohms).

10.Using the analog ohmmeter, connect the positive meter probe to the terminal on the diode module. Connect the negative meter probe to the heat sink. The resistance should be low (approximately 300 ohms). Also check diode D3 (right side) or D4 (left side) for an open or shorted condition. See the Wiring Diagram.

When all tests are complete:

11.Reconnect all leads previously removed.

12.Torque the capacitor nuts to 50-60 inch- pounds.

13.If finished testing, perform the Case Cover Replacement procedure.

COMMANDER 500