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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
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