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Section F-1 Section F-1
RANGER 9 RANGER 9
Troubleshooting & Repair Section.................................................................................Section F
How to Use Troubleshooting Guide ......................................................................................F-2
PC Board Troubleshooting Procedures.................................................................................F-3
Troubleshooting Guide.................................................................................................F4 - F-18
Test Procedures
Rotor Voltage Test.........................................................................................................F-19
Rotor Resistance Test ...................................................................................................F-21
Auxiliary and Field Winding Test ...................................................................................F-24
Output Rectifier Bridge Test..........................................................................................F-29
Charging Circuit Test.....................................................................................................F-31
Engine Throttle Adjustment Test ...................................................................................F-33
Oscilloscope Waveforms .....................................................................................................F-37
Normal Open Circuit Voltage Waveform (115 VAC Supply)..........................................F-37
Typical DC Weld Output Waveform (CV Mode) – Machine Loaded..............................F-38
Typical DC Weld Output Waveform – Machine Loaded................................................F-39
Typical AC Weld Output Waveform – Machine Loaded................................................F-40
Abnormal Open Circuit Weld Voltage Waveform (one diode open)..............................F-41
Abnormal Open Circuit DC Weld Voltage Waveform
(High CV Mode) – Output Capacitor Bank not Functioning ...................................F-42
Normal Open Circuit Weld Voltage Waveform (High CV Mode) ...................................F-43
Normal Open Circuit DC Weld Voltage Waveform........................................................F-44
Normal Open Circuit AC Weld Voltage Waveform ........................................................F-45
Replacement Procedures ....................................................................................................F-46
Brush Removal and Replacement ................................................................................F-46
Field Capacitor and Rectifier Bridge Removal and Replacement ................................F-49
Printed Circuit Board Removal and Replacement........................................................F-52
Output Rectifier Bridge Removal and Replacement.....................................................F-55
Output Capacitor Removal and Replacement..............................................................F-58
Output Contactor Removal and Replacement..............................................................F-61
Engine Rotor Removal and Replacement (Kit S20788) ................................................F-64
Retest After Repair ..............................................................................................................F-69
TABLE OF CONTENTS
TROUBLESHOOTING & REPAIR SECTION
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