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Parasound P/LD 1500 transformer question
Hello,
I have still probs with my new pre-amp. Found three fried transistors and a zero-ohm cap. This is fixed so I can feed the unit with 12V AC on all inputs and it works. But on the very bad copy of the schematics I could read +/- 24V and +/-15V on the connectors which supply the preamp stage with power. On two of the 6 wires I measure +15 and -15 like in the schematics, the two other show +16 and -16 (the other two are ground). I think (the schematics shows 3 outputs on the power transformer) that I need 12V / 15V / 24V AC or 12V / 2x24 V AC. But I will not grill some transistors:_)) So can someone with this item please measure AC-voltages on the transformer and post it to me? Thanks Wolfgang |
#2
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Parasound P/LD 1500 transformer question
Wolfgang Smetanig wrote: Hello, I have still probs with my new pre-amp. Found three fried transistors and a zero-ohm cap. On a *new* unit ? I assume you don't mean actually brand-new. This is fixed so I can feed the unit with 12V AC on all inputs and it works. What kind of pre-amp takes 12V at the inputs ? But on the very bad copy of the schematics I could read +/- 24V and +/-15V on the connectors which supply the preamp stage with power. Plausible. On two of the 6 wires I measure +15 and -15 like in the schematics, the two other show +16 and -16 (the other two are ground). I think (the schematics shows 3 outputs on the power transformer) that I need 12V / 15V / 24V AC or 12V / 2x24 V AC. But I will not grill some transistors:_)) So can someone with this item please measure AC-voltages on the transformer and post it to me? Sounds more like a PSU problem than transformer. Why not measure the transformer secondary voltages yourself ? Either they will be right or open circuit. Transformers don't go slightly wrong voltage. Graham |
#3
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Parasound P/LD 1500 transformer question
@ Pooh Bear
On a *new* unit ? I assume you don't mean actually brand-new. Ok, not clearly defined - my new acquired pre-amp. This is fixed so I can feed the unit with 12V AC on all inputs and it works. Caught twice:-)) Meant the internal inputs Sounds more like a PSU problem than transformer. Sorry for my bad (technical) english - meant the PSU = transformer Why not measure the transformer secondary voltages yourself ? Either they will be right or open circuit. Transformers don't go slightly wrong voltage. But they could be destroyed - like in this case. So the output is on all wires 0 Wolfgang |
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