Lincoln Electric SVM188-A service manual Main Transformer Voltage Test

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F-24	TROUBLESHOOTING AND REPAIR			F-24
MAIN TRANSFORMER VOLTAGE TEST (continued)
	FIGURE F.11 – FIRING BOARD
			(205) 8	J5
	LED8	LED9 LED7		16 (204)
			(206) 7	15 (203)
			(207) 6	14
			(208) 5	13 (231)
			4	12 (215)
			3	11
			2	10
			1
				9
LED5	LED3	LED1		J6

LED10

J7

LED6 LED4 LED2

J8

J4

G3742-[ ] FIRING BOARD

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PROCEDURE

WARNING

ELECTRIC SHOCK can kill.

•Do not touch electrically hot parts.

13.Remove the input power to the DC-600. Remove the screws from the control box cover and careful- ly lower the cover and locate plug J5 on the Firing Board. See Figure F.11.

14.Turn on the DC-600 and check for approximately 32 VAC at the following pins of plug J5. These are the phase angle winding voltages. See Figure F.11.

Plug J5 pin-15 (lead #203) to pin-16 (lead #204)

Plug J5 pin-8 (lead #205) to pin-7 (lead #206)

Plug J5 pin-6 (lead #207) to pin-5 (lead #208)

18.If the correct primary voltages are applied to the main transformer and any of the secondary volt- ages are missing or not correct, the transformer may be faulty.

NOTE: Always check the wiring between the trans- former windings and the test points before replac- ing the transformer.

DC-600