Lincoln Electric NA-5S - Manual (Page 54)

NA-5
SECTION F-1 TROUBLESHOOTING & REPAIR SECTION F-1
TABLE OF CONTENTS
-TROUBLESHOOTING AND REPAIR SECTION-
Troubleshooting and Repair ......................................................................................................Section F
How to Use Troubleshooting Guide......................................................................................................F-2
PC Board Troubleshooting Procedures................................................................................................F-3
Troubleshooting Guide .........................................................................................................................F-4
PC Board LED Definitions ..................................................................................................................F-36
PC Board LED Sequence Table.........................................................................................................F-37
Test Procedures .................................................................................................................................F-38
DC Power Supply Test ....................................................................................................................F-38
T1 and T2 Transformer Test ...........................................................................................................F-42
Voltage Board Transformer Test .....................................................................................................F-45
Wire Feed Drive Motor Test ............................................................................................................F-48
External Resistance Test (Leads #21 and #67) ..............................................................................F-50
Out of Voltage Range Shut Sown Test ...........................................................................................F-52
Tach Board Feedback Test .............................................................................................................F-55
VoltmeterAccuracy Test ..................................................................................................................F-57
Wire Speed Accuracy Test..............................................................................................................F-60
Meter Circuit Accuracy Test ............................................................................................................F-64
Replacement Procedures ...................................................................................................................F-71
PC Board(s) Removal and Replacement ........................................................................................F-71
Digital Meter and Meter PC Board Removal and Replacement ......................................................F-73
Tach PC Board Removal and Replacement ...................................................................................F-77
Wire Drive Motor Removal and Replacement .................................................................................F-81
Retest After Repair .............................................................................................................................F-85
Return to Master TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC