Lincoln Electric SVM156-A service manual Power Board Test

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F-25	TROUBLESHOOTING & REPAIR					F-25
	POWER BOARD TEST (CONTINUED)
	TABLE F.4 – POWER BOARD VOLTAGE CHECKS
CHECK POINT	TEST	CONNECTOR			LEAD NO. OR	NORMAL
LOCATION	DESCRIPTION	PLUG PIN NO.			IDENTITY	ACCEPTABLE
						VOLTAGE
						READING
POWER BOARD	CHECK 40 VDC		2 (+)		477 (+)	38 – 42 VDC
CONNECTOR	INPUT FROM	475	1 (-)	477	475 (-)
PLUG J41	DC BUS BOARD
POWER BOARD	CHECK +15		1 (+)		225 (+)	+15 VDC
CONNECTOR	VDC SUPPLY FROM	225	5 (-)		222 (-)
PLUG J42	POWER BOARD
			222
POWER BOARD	CHECK +5 VDC		3 (+)		221 (+)	+5 VDC
CONNECTOR	SUPPLY FROM		5 (-)	221	222 (-)
PLUG J42	POWER BOARD
			222
POWER BOARD	CHECK -15 VDC		2 (+)		222 (+)	-15 VDC
CONNECTOR	SUPPLY FROM	223	5 (-)		223 (-)
PLUG J42	POWER BOARD
			222
POWER BOARD	CHECK +5 VDC		5 (+)		274 (+)	+5 VDC
CONNECTOR	ARCLINK SUPPLY		10 (-)	274	273 (-)
PLUG J43	FROM POWER BOARD
				273
POWER BOARD	CHECK +5 VDC		4 (+)		226 (+)	+5 VDC
CONNECTOR	“RS-232” SUPPLY		9 (-)	226	228 (-)
PLUG J43	FROM POWER BOARD
		228
POWER BOARD	CHECK +15 VDC		6 (+)		266 (+)	+15 VDC
CONNECTOR	SPI SUPPLY FROM		11 (-)	266	267 (-)
PLUG J43	POWER BOARD
				267
POWER BOARD	CHECK +40 VDC		4 (+)		478 (+)	38 – 42 VDC
CONNECTOR	INPUT FROM		3 (-)		476 (-)
PLUG J41	DC BUS BOARD
		476		478
POWER BOARD	CHECK +5 VDC		3 (+)		268A (+)	+5 VDC
CONNECTOR	SPI SUPPLY FROM	268A	12 (-)		262 (-)
PLUG J43	POWER BOARD
				262
POWER BOARD	CHECK +20 VDC STT		7 (+)		345 (+)	+20 VDC
CONNECTOR	SUPPLY FROM	346	1 (-)		346 (-)
PLUG J43	POWER BOARD
		345

POWER WAVE 455/R