Table f.2, Troubleshooting & repair – Lincoln Electric PRO-CUT 55 SVM140-A User Manual
Page 57
TROUBLESHOOTING & REPAIR
F-20
F-20
PRO-CUT 55
PRIMARY POWER BOARD RESISTANCE TEST AND
CAPACITOR VOLTAGE TEST (continued)
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.2
PRIMARY POWER BOARD RESISTANCE TEST POINTS
6.
If the power board does not meet the
acceptable readings outlined in Table F.2,
the board is faulty. Replace. See Power
Board Removal and Replacement
Procedure.
NOTE: Complete power board and filter
capacitor replacement is recom-
mended.
7. If the power board “passes” the resistance
test, the IGBT portion of the board is good.
However, other circuits on the power board
may be faulty. These circuits are NOT readi-
ly tested or serviceable.
8. Reconnect leads #201, #204, #205 and #208
to their appropriate terminals.