PROBLEMS
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| PROBLEM |
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| POSSIBLE CAUSE |
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| WHAT TO DO |
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| 7. No control of wire feed. |
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| a. Defective Wire Feed Unit to |
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| a. Remove Control Box to Wire Feed |
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| Control box cable or harnessing. |
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| Unit Cable and Check F to F, G to G |
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| and H to H for continuity. If any of the |
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| continuity tests fail, replace cable. |
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| Otherwise check related harnesses |
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| for continuity (Refer to Wiring |
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| Diagram). If continuity checks O.K. |
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| on harnessing, proceed to b. |
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| b. Defective wire feed motor tach or |
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| b. Measure voltage across pin 2 (+) of |
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| control PC Board. |
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| J3 and pin 3 |
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| with motor running. If voltage is 1.5- |
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| 3.5V then replace control PC board |
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| (see Procedure for Replacing PC |
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| Boards). If not, then replace |
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| tachometer. |
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| c. Problem with serial |
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| c. See 2e. |
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| communications in input control |
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| cable. |
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| 8. No wire feed, solenoid, or arc |
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| a. Faulty gun or gun trigger switch. |
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| a. Remove gun. Check continuity |
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| voltage. LED display indicated |
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| between trigger pins with trigger |
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| Synergic 7F has input power. |
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| closed. If no continuity repair or |
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| replace gun. |
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| b. Defective Control Box to Wire |
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| b. Replace gun. Remove plug from J1 |
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| Feed Unit Cable or harness |
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| on control board. Check that there is |
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| wiring & connections. |
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| continuity between plug pins 2 and 8 |
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| when trigger is closed and no |
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| continuity when trigger is open. If the |
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| continuity tests pass proceed to c. If |
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| not, check I to I and J to J in cable. If |
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| this continuity test fails, replace |
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| cable. Otherwise check wiring |
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| harnesses and proceed to c. if no |
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| harness problem is encountered. |
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| c. Defective control PC board or |
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| c. Remove gun. Check voltage across |
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| gun connector. |
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| trigger sockets on gun connector. |
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| If voltage is > ±11V DC, then gun is |
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| defective. |
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| If voltage is < ±11V DC, then check |
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| the voltage across pin 2 (+) and pin 8 |
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| board. |
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| If the voltage is still < ±11V DC, then |
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| replace control PC board, otherwise, |
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| replace gun connector. (See |
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| Procedure for Replacing PC boards.) |
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– 31 –
