TROUBLESHOOTING
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| CAUSES |
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| WHAT TO DO | |||
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| 3. Machine does not have |
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| a. | Voltage adjust potentiometer leads |
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| a. | Check and repair broken leads. |
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| maximum output. |
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| open. |
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| b. | Voltage adjust potentiometer |
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| b. | Refer to procedure for checking |
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| defective. |
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| Voltage Control Potentiometer on |
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| Machine. |
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| c. | Faulty P.C. Board. |
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| c. | Refer to Procedure for Replacing |
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| P.C. Boards. |
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| 4. Poor welding charac- |
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| a. | Poor work or electrode connection. |
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| a. | Check and clean all connections. |
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| teristics. | Poor | arc |
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| striking with sticking or |
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| b. | Improper settings for wire feed |
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| b. | Refer to a welding procedures guide |
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| speed and volts. |
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| for proper settings. |
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| ity, narrow and ropey |
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| looking | bead, | or |
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| c. | Capacitor Bank Contactor not |
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| c. | Refer to the procedure for Checking |
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| electrode stubbing into |
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| working. |
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| the Capacitor Bank Contactor CR3. |
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| the plate. |
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| d. | Capacitors in power source output |
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| d. Replace entire bank of capacitors, |
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| circuit failed. A failure is indicated |
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| observe correct polarity. Do not |
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| if the small vent plug on the top of |
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| replace individual capacitors. |
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| a capacitor is raised or blown out. |
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| WARNING: The liquid electrolyte in |
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| these capacitors is toxic. Avoid con- |
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| tact with any portion of your body. |
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| Clean up vented electrolyte using |
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| rubber gloves and a water damp- |
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| ened cloth. Any electrolyte which |
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| gets on skin, clean with soap and |
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| water. |
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| e. | Opening in feedback circuit. |
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| e. | Check wiring and P.C. Board wiring |
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| harness plugs. Pay special attention |
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| to leads 667 and 621. |
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| f. | Faulty P.C. Board. |
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| f. | Refer to procedure for replacing P.C. |
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| Board. |
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– 22 –
