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Troubleshooting And Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section F
How To Use Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2
PC Board Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . F-3
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-4
Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-12
Control Relay Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-12
Trigger Transformer Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-14
Control Cable Continuity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-16
Component Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . F-18
Wire Feed Speed Potentiometer Replacement . . . . . . . . . . . . . . . F-18
Circuit Breaker Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-21
Ground Lead Protector Push Button Switch Replacement . . . . . . . F-23
Trigger Transformer Replacement . . . . . . . . . . . . . . . . . . . . . . . . . F-25
Ground Lead Protector Reed Switch Replacement . . . . . . . . . . . . . F-27
Control PC Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . F-29
Main Power Resistor (R
1
) Replacement . . . . . . . . . . . . . . . . . . . . . F-32
Control Relay Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-35
Wire Drive Assembly and Components Replacement . . . . . . . . . . . F-37
Swing Arm Assembly Replacement for Two-Roll Wire Feeders . . . . F-41
Swing Arm Assembly Replacement for Four-Roll Wire Feeders . . . F-44
Gas Solenoid and Connections Replacement . . . . . . . . . . . . . . . . . F-47
Retest After Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-50
Section F
TABLE OF CONTENTS
- TROUBLESHOOTING AND REPAIR SECTION -
LN-7 GMA WIRE FEEDER
ELECTRIC SHOCK can kill.
• Never work on the inside of the machine without turning off the input
power. You can receive a life threatening electrical shock if you fail to
do this. Only qualified technicians should perform installation,
maintenance, and troubleshooting work on the machine.
WARNING
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