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Hifonics Colossus X3
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Old 8th October 2019, 03:29 PM   #21
Perry Babin is offline Perry Babin  United States
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The transformer is soldered in the board. Did you power it up and find a problem that you believe to be transformer related?
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Old 8th October 2019, 04:04 PM   #22
Achim1409 is offline Achim1409  Germany
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yes, i removed the transformer because of intermittend short. I insulated the windings, but forgot, how the windings was connected togheter to the board. I tried some options.. if i connect center taps to center board, i draws high current. The other option, is the center tap to the upper connection on bord, then it works normal, but if i measure voltage on the rectifiers, i have 0V at the inner connection, ( the inner connecteion between the to rectifiers is connected to the center conection on the bord). Ground probe at B-
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Old 8th October 2019, 04:25 PM   #23
Perry Babin is offline Perry Babin  United States
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I'm not sure I understand the confusion. The windings typically alternate (notice gold and violet in the image below). The two in the center are typically connected together.

You could have a problem with a shorted transformer. I've only worked on one amp like this and it had 2 bad transformers that required insulation be added to the windings to save them.
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File Type: png xfmr.png (98.5 KB, 26 views)
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Old 8th October 2019, 04:26 PM   #24
Achim1409 is offline Achim1409  Germany
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yes, i expected the same as on your picture...so i will check next time aggain...
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Old 9th October 2019, 05:11 PM   #25
Achim1409 is offline Achim1409  Germany
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So, i repaired the transformer with a special resin. My problem is still, that i dont know, how to bound the windings together, because i mixed during repair. On the transformer i have to secondary windings. The end of this windings i bound together as center tap. Then i have the aux winding for the op voltage. I bound them also to the center tap, and the open ends, as it was before to the diodes. I have voltage, but the fets on the side of this transformer slowly heats up, and i have no green light, as same no audio came out.

For shure i made something wrong with bounding this windings.
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Old 9th October 2019, 05:26 PM   #26
Perry Babin is offline Perry Babin  United States
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If it's not drawing excessive current (peg out the power supply), I think you have it right.

I'm assuming that the aux windings have the same ratio and go to the same secondary power supply.
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Old 10th October 2019, 09:44 AM   #27
Achim1409 is offline Achim1409  Germany
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I just checked aggain, i think its correct. I measure on the rectifiers for the op amps, 30V DC, but ist dropping slowly to 20V. On the OP amps i have 0V...so i have to check, whats wrong there.
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Old 10th October 2019, 09:57 AM   #28
Perry Babin is offline Perry Babin  United States
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In some amps with regulated power supplies, the pulse width initially goes to near 50% then drops back as the target rail voltage is reached. That may explain why the aux supply goes high then drops and stabilizes.
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Old 10th October 2019, 02:15 PM   #29
Achim1409 is offline Achim1409  Germany
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Can I parallel bzx55c15 to get 1watt?
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Old 10th October 2019, 04:11 PM   #30
Perry Babin is offline Perry Babin  United States
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Technically, yes but if you're doing this for a paying customer, order the right parts.
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