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Lincoln Electric V250-S Welder User Manual

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F-21

TROUBLESHOOTING & REPAIR

F-21

6. If the power board does not meet the

acceptable readings outlined in

Table F.3. the board may be faulty.

Replace. See

Power Board

Removal and Replacement

Procedure

.

Note: Complete power board and filter

capacitor replacement is recommended

.

7. If the power board “passes” the

resistance test proceed to the

Power

Board Voltage Test

.

Note: Reconnect leads #201, #204,

#205 and #208 to their appropriate ter-

minals.

POWER BOARD RESISTANCE TEST (continued)

INVERTEC V250-S

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TEST POINT TERMINALS ANALOG METER X10 RANGE

+ Probe - Probe Acceptable Meter Readings

201 207A Greater than 1000 ohms

207A 201 Less than 100 ohms

204 207A Greater than 1000 ohms

207A 204 Less than 100 ohms

202A 204 Greater than 1000 ohms

204 202A Less than 100 ohms

202A 201 Greater than 1000 ohms

201 202A Less than 100 ohms

205 203A Greater than 1000 ohms

203A 205 Less than 100 ohms

208 203A Greater than 1000 ohms

203A 208 Less than 100 ohms

206 208 Greater than 1000 ohms

208 206 Less than 100 ohms

206 205 Greater than 1000 ohms

205 206 Less than 100 ohms

TABLE F.3 Power Board Resistance Test Points.

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