3-1
MAINTENANCE
Service Manual
Section 3 MAINTENANCE
In this section:
Introduction ..........................................................................................3-2
Routine Maintenance ...........................................................................3-2
Bowl Draining/Filter Element Cleaning ............................................3-2
Cooling Air Filter Removal, Cleaning and Replacement..................3-3
Theory of Operation .............................................................................3-4
Sequence of Operation ........................................................................3-6
Troubleshooting....................................................................................3-7
Test Equipment ................................................................................3-7
Troubleshooting Procedures............................................................3-7
Visual Inspection - External .............................................................3-7
Visual Inspection - Internal ..............................................................3-8
Initial Resistance Checks ................................................................3-9
Corrective Maintenance Checks....................................................3-17
Power Board ......................................................................................3-26
Control Board .....................................................................................3-28
Control Board LEDs.......................................................................3-28
Control Board Test Points ..............................................................3-29
Torch Check .......................................................................................3-30
Cap Sensor Circuit Check .............................................................3-30
Start Circuit Check.........................................................................3-31
PAC121TS Torch Parts Removal and Replacement ..........................3-32
Torch Main Body Removal and Replacement ...............................3-32
Torch Switch Removal and Replacement ...................................... 3-33
PAC121MS Torch Parts Removal and Replacement .........................3-34
Removal ........................................................................................3-34
Replacement .................................................................................3-34
Quick Disconnect O-Ring Removal and Replacement ...................... 3-36
9-96
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