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LF-72/74 SINGLE/DUAL
Section F-1 Section F-1
TABLE OF CONTENTS
- TROUBLESHOOTING & REPAIR SECTION -
Troubleshooting & Repair Section ........................................................................Section F
How to Use Troubleshooting Guide..............................................................................F-2
PC Board Troubleshooting Procedures and Replacement...........................................F-3
Troubleshooting Guide..................................................................................................F-4
Test Procedures
Drive Motor and Tach Feedback Test..............................................................F-7/F-8
Gas Solenoid Test..........................................................................................F-9/F-10
Diode Bridge Test ........................................................................................F-11/F-12
Wire Speed Potentiometer Test...................................................................F-13/F-14
Replacement Procedures
PC Board Removal and Replacement.........................................................F-15/F-16
Wire Drive Motor and Gear Box Removal and Replacement......................F-17/F-20
Retest After Repair ...............................................................................................F-21