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TROUBLESHOOTING & REPAIR
CONTROL TRANSFORMER (T5) VOLTAGE TEST (continued)
FIGURE F.14 – PLUG P4 DETAILS
END VIEW
BLACK
LEADS
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6.Check fuse F1 (0.5 amp). Test the resis- tance from 6J15, on the
A.If zero ohms resistance is shown, the test is OK. Proceed to the
B.If resistance of any value is shown, check wires and connections.
7.Test for the correct AC voltages at Plug P4. See Figure F.14.
A.If one or more voltages are missing or incorrect, the control transformer is faulty. Replace.
B.Also check for 24VAC at the two black leads going to 1J16 on the
IMPORTANT: If the control transformer is replaced, refer to the label on the new trans- former for correct primary lead connections. If connected wrong, the machine will have no OCV output. If no OCV occurs, reverse the control transformer primary connections and recheck machine OCV.
NOTE: If input voltage varies, control trans- former voltages will vary accordingly.
CONTROL TRANSFORMER (T5)
VOLTAGE TEST CHART
Secondary Lead |
|
| Approximate |
Colors | Plug P4 Pins | Voltages | |
|
|
|
|
Yellow to Yellow | 1 to | 2 | 10VAC |
Blue to Blue | 4 to | 6 | 32VAC |
White to Blue | 5 to | 6 | 16VAC |
Red to White | 10 to 5 | 18VAC | |
Red to Red | 10 to | 12 | 36VAC |
|
|
|
|
SQUARE WAVE TIG 355
