Lincoln Electric SVM146-A service manual Output Power Board Removal and Replacement Procedure

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F-22 F-22

TROUBLESHOOTING & REPAIR

OUTPUT POWER BOARD RESISTANCE TEST (continued)

TABLE F.4 - OUTPUT POWER BOARD RESISTANCE

	CIRCUIT OR
TEST POINTS	COMPONENT(S)	EXPECTED RESISTANCE
	BEING TESTED
+Probe J33-Pin4	Diode A1	Less than
to	and	100 ohms
–Probe Terminal X2	associated trace
+Probe Terminal X2	Diode A1	Greater than
to	and	1000 ohms
–Probe J33-Pin4	associated trace
+Probe J33-Pin4	Diode A1	Less than
to	and	100 ohms
–Probe Terminal X4	associated trace
+Probe Terminal X4	Diode A1	Greater than
to	and	1000 ohms
–Probe J33-Pin4	associated trace
+Probe D29 Test Point	Diode A2	Less than
to	and	100 ohms
–Probe Terminal X20	associated trace
+Probe Terminal X20	Diode A2	Greater than
to	and	1000 ohms
–Probe D29 Test Point	associated trace
+Probe D29 Test Point	Diode A2	Less than
to	and	100 ohms
-Probe Terminal X40	associated trace
+Probe Terminal X40	Diode A2	Greater than
to	and	1000 ohms
–Probe D29 Test Point	associated trace
+Probe D29 Test Point	Transistor A2	Less than
to	and	100 ohms
–Probe J32-Pin14	associated trace
+Probe J32-Pin14	Transistor A2	Greater than
to	and	1000 ohms
–Probe D29 Test Point	associated trace

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6.If any of the resistance checks are not correct, the output power board is faulty. Replace. See the

Output Power Board Removal and Replacement Procedure.

7.If the output power board “passes” the resistance test, the power diode and transistor portion of the board is good. However, other circuits on the power board may be faulty. These circuits are NOT readily tested or serviceable.

8.Carefully reconnect the leads and plugs previously removed. Torque X2, X4, and B21 to 75 IN. LBS.

PRO-CUT 80