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Section F-1 Section F-1
RANGER 8
Troubleshooting & Repair Section .................................................................................Section F
How to Use Troubleshooting Guide ......................................................................................F-2
PC Board Troubleshooting Procedures .................................................................................F-3
Troubleshooting Guide .................................................................................................F4 - F-13
Test Procedures
Rotor Voltage Test.........................................................................................................F-15
Rotor Resistance Test ...................................................................................................F-17
Auxiliary and Field Winding Test ...................................................................................F-21
Output Rectifier Bridge Test..........................................................................................F-25
Charging Circuit Test.....................................................................................................F-27
Engine Throttle Adjustment Test ...................................................................................F-29
Oscilloscope Waveforms .....................................................................................................F-33
Normal Open Circuit Voltage Waveform (115 VAC Supply)..........................................F-33
Typical DC Weld Output Waveform (CV Mode) – Machine Loaded..............................F-34
Typical DC Weld Output Waveform (CC Mode) – Machine Loaded .............................F-35
Typical AC Weld Output Waveform – Machine Loaded................................................F-36
Abnormal Open Circuit Weld Voltage Waveform (CV Mode, one diode open).............F-37
Abnormal Open Circuit DC Weld Voltage Waveform....................................................F-38
Normal Open Circuit Weld Voltage Waveform (CV Mode)............................................F-39
Normal Open Circuit DC Weld Voltage Waveform........................................................F-40
Normal Open Circuit AC Weld Voltage Waveform ........................................................F-41
Replacement Procedures ....................................................................................................F-43
Brush Removal and Replacement ................................................................................F-43
Field Capacitor and Rectifier Bridge Removal and Replacement ................................F-47
Printed Circuit Board Removal and Replacement ........................................................F-51
Output Rectifier Bridge Removal and Replacement.....................................................F-55
Engine Rotor Removal and Replacement (Kit S20788) ................................................F-59
Retest After Repair ..............................................................................................................F-64
TABLE OF CONTENTS
TROUBLE SHOOTING & REPAIR SECTION