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Section F-1 Section F-1
LN-9 GMA Wire Feeder
Troubleshooting & Repair Section ................................................................................Section F
How to Use Troubleshooting Guide.......................................................................................F-2
PC Board Troubleshooting Procedures .................................................................................F-3
Troubleshooting Guide................................................................................................F-4 - F-23
Test Procedures
T1 Transformer Test ......................................................................................................F-24
T2 Transformer Test ......................................................................................................F-27
Wire Drive Motor Test....................................................................................................F-31
Hall Effect Test and Alignment.......................................................................................F-34
Voltmeter Accuracy Test................................................................................................F-38
Meter Circuit Accuracy Test...........................................................................................F-41
Wire Speed Accuracy Test ............................................................................................F-46
Out of Voltage Range Shut Down Test .........................................................................F-48
General Power Supply Tests.........................................................................................F-51
Replacement Procedures
Digital Meter and Meter PC Board Removal and Replacement ...................................F-54
Reed Switch (CR2) Removal and Replacement...........................................................F-57
T1 Transformer Removal and Replacement .................................................................F-59
Drive Motor Removal and Replacement .......................................................................F-64
Retest After Repair...............................................................................................................F-69
TABLE OF CONTENTS
TROUBLESHOOTING & REPAIR SECTION
NOTE
This Troubleshooting section is specific to the
LN-9 GMA. However, much of this information
may apply to the LN-9 F GMA model with slight
adaptation. Refer to LN-9F GMA Wiring Diagram.