Lincoln Electric SVM140-A service manual Output Power Board Resistance Test

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F-26				F-26
	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 B11	associated trace
	+Probe Terminal B11	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 B12	associated trace
	+Probe Terminal B12	Diode A1	Greater than
	to	and	1000 ohms
	–Probe J33-Pin4	associated trace
	or D30
	+Probe R5 Test Point	Diode A2	Less than
	to	and	100 ohms
	–Probe Terminal B1	associated trace
	+Probe Terminal B1	Diode A2	Greater than
	to	and	1000 ohms
	–Probe R5 Test Point	associated trace
	or
	–Probe D30 Test Point
	or D30
	+Probe R5 Test Point	Diode A2	Less than
	to	and	100 ohms
	-Probe Terminal B2	associated trace
	+Probe Terminal B2	Diode A2	Greater than
	to	and	1000 ohms
	–Probe R5 Test Point	associated trace
	or
	–Probe D30 Test Point
	+Probe R5 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 R5 Test Point	associated trace
	or
	–Probe D30 Test Point

6.	If any of the resistance checks are not correct, the		test, the power diode and transistor portion of the
	output power board is faulty. Replace. See the		board is good. However, other circuits on the
	Output Power Board Removal and Replacement		power board may be faulty. These circuits are NOT
	Procedure. Note: Use D30 test point for boards		readily tested or serviceable.
	G3326-2,3.	8.	Reconnect the leads and plugs previously
7.	If the output power board “passes” the resistance		removed.

PRO-CUT 55