Lincoln Electric SPIRIT II 275 Technical Manual page 128

Section 6: Maintenance &Troubleshooting
13. Remove primary power from the Spirit system. Check cable continuity between the
chopper PCB and DSP PCB. Use a digital voltmeter set up to read resistance
(ohms) and make the following measurements:
Chopper (1) J1-1 to DSP J7-1
Chopper (1) J1-2 to DSP J7-2
Chopper (1) J1-3 to DSP J7-3
Chopper (1) J1-5 to DSP J7-4
Chopper (2) J1-1 to DSP J8-1
Chopper (2) J1-2 to DSP J8-2
Chopper (2) J1-3 to DSP J8-3
Chopper (2) J1-5 to DSP J8-4
Chopper (3) J1-1 to DSP J9-1
Chopper (3) J1-2 to DSP J9-2
Chopper (3) J1-3 to DSP J9-3
Chopper (3) J1-5 to DSP J9-4
If ALL of the continuity readings are good, replace DSP PCB.
This information is subject to the controls of the Export Administration Regulations [EAR]. This information shall not be provided to
non-U.S. persons or transferred by any means to any location outside the United States contrary to the requirements of the EAR.
6-14
Spirit II User's Manual