Lincoln Electric LN-9 SVM127-A Service Manual page 59

Section F-1
TROUBLESHOOTING & REPAIR SECTION
Troubleshooting & Repair Section ................................................................................Section F
How to Use Troubleshooting Guide .......................................................................................F-2
PC Board Troubleshooting Procedures .................................................................................F-3
Troubleshooting Guide ................................................................................................F-4 - F-22
Test Procedures
T1 Transformer Test ......................................................................................................F-23
T2 Transformer Test ......................................................................................................F-26
Wire Drive Motor and Tach Feedback Test ...................................................................F-30
Voltmeter Accuracy Test ................................................................................................F-34
Meter Circuit Accuracy Test...........................................................................................F-37
Wire Speed Accuracy Test ............................................................................................F-42
Out of Voltage Range Shut Down Test .........................................................................F-44
General Power Supply Tests .........................................................................................F-47
Replacement Procedures
Digital Meter and Meter PC Board Removal and Replacement ...................................F-50
Reed Switch (CR2) Removal and Replacement ...........................................................F-53
T1 Transformer Removal and Replacement .................................................................F-55
Tach PC Board Removal and Replacement..................................................................F-60
Drive Motor Removal and Replacement .......................................................................F-64
Retest After Repair...............................................................................................................F-69
TABLE OF CONTENTS
NOTE
This Troubleshooting section is specific to the
LN-9. However, much of this information may
apply to the LN-9F model with slight adaptation.
Refer to LN-9F Wiring Diagram.
LN-9 Wire Feeder
Section F-1