Lincoln Electric SVM101-B service manual Figure F.23 Power Board Test Points

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

F-49 TROUBLESHOOTING & REPAIR F-49

POWER BOARD TEST (cont.)

FIGURE F.23 - POWER BOARD TEST POINTS

309	310		212A		301 302
	L8033	POWER BOARD
J7	313	J14		J6	275D
		311	211A
501					305
504

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

6.Test for 18 VAC input from Auxiliary Transformer between leads 504 and 501 (J7-pin 5 & pin6) on Power Board.

If 18 VAC is not correct, check the 3 amp fuse, the Auxiliary Transformer and associated wires.

7.Test for 15 VDC output between leads 275D (-) and 302 (+) (J6-pin1 & pin 6) on Power Board.

If 15 VDC output is not present, replace Power Board.

NOTE: If relays energized in Step 4a, skip to Step 10.

8.Test for 24 VAC from lead 211A t to lead 212A (J6- pin 4 & pin 9).

If 24VAC is not present, test the Auxiliary trans former and associated wires. The Control Board or thermostats may also be defective. (See Fig. F.24).

9.Test for 24VDCfrom lead 309(+) to lead 313(-) (J7pin 2 to J14 pin 2).

If 24VDC is not present but 24VAC (step 8) is cor rect, the Power Board is defective.

10.Test for 24VDC from lead 309(+) to lead 310(-) (J7 pin 2 to J7 pin 4).

If 24 VDC is not present, check the voltage from lead 311(+) to lead 313(-).

If the voltage is greater than 1VDC, perform the Protection Board test.

If the voltage is approximately 1vdc and the 24vdc is not present between leads 309 & 310, the Power Board is defective

V300-I