ESAB Fabricator 181i, Service Manual

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ESAB FABRICATOR 181i
Manual 0-5449 6-7 TROUBLESHOOTING
6.09 Check Main On / Off Switch
23
24
25 26
Art # A-10459
Power Switch Testing Multimeter Lead Placement Impedance
Switch ON
Positive meter lead to testpoint 23
Negative meter lead to testpoint 24
0 to 1 Ω
Switch ON
Positive meter lead to testpoint 25
Negative meter lead to testpoint 26
0 to 1 Ω
Switch OFF
Positive meter lead to testpoint 23
Negative meter lead to testpoint 24
> 1k Ω
Switch OFF
Positive meter lead to testpoint 25
Negative meter lead to testpoint 26
> 1k Ω
Table 6-7 Power Switch, Multimeter set to measure ohms (Ω)
6.10 Check Main Input Rectifier
Input Rectifier Testing Multimeter Lead Placement Diode Voltage
AC1 to DC+
Positive meter lead to AC1
Negative meter lead to testpoint DC+
0.2 – 0.8 VDC
AC2 to DC+
Positive meter lead to AC2
Negative meter lead to testpoint DC+
0.2 – 0.8 VDC
AC1 to DC-
Positive meter lead to testpoint DC-
Negative meter lead to testpoint AC1
0.2 – 0.8 VDC
AC2 to DC-
Positive meter lead to testpoint DC-
Negative meter lead to testpoint AC2
0.2 – 0.8 VDC
Table 6-8 IGBT’s, Multimeter set to measure Diode Voltage
Measurements may be made directly onto the main input rectifier. AC1 and AC2 may be measured from the pins on the mains supply
plug with the main power switch set to the ON position.