Table 4-3. Troubleshooting continued

TM-5-3820-256-24-2 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12NSN3820-01-245-4276 Manual
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Table 4-3. Troubleshooting — continued. Trouble Possible cause Remedy Battery discharges bet- batteries only). months). ween uses (cont'd.) 3. Battery. Replace battery. 4. Oil pressure switch S2. Replace S2. No power output at Weld/Power switch S1 in Place S1 in POWER position. power receptacles. WELD position. Low power output at 1. Low setting on FINE Rotate R1 to 100. power receptacles. AMPERAGE control R1. 2. Engine running below Check air filter; clean if required speed (1860 necessary. Adjust engine rpm). speed. 3. Voltage Regulator board Replace PC2. PC 2. 4. Transformer T1. Replace T1. Low weld output. Engine running below re- Check air filter; clean if quired speed (3000 rpm). necessary. Fill fuel tank. Adjust engine speed. Erratic weld output. 1. Damp or wrong type Try different electrodes. electrodes. 2. Improper connection to Check and tighten loose workpiece. connections. Erratic weld and power Dirty slip rings and/or worn Clean slip rings and/or rep- output. brushes. lace worn brushes. High power voltage. Voltage Regulator board Replace PC2. PC 2. High weld voltage. Voltage Regulator board Disconnect lead No. 48 from PC2. Voltage Regulator board PC2. If voltage drops to 80 volts ac, replace Voltage Regulator board PC2. 4-12 BOOSTER BATTERY JUMP STARTING. 4-12.1 If jump starting is attempted, employ the safety precautions below and the following step by step procedures in order of appearance. 4-33

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