Hello, can anyone help me with finding schematic manual for EAD DSP-7000 mk2? OR MK1 at least . . I have a dead transformer in this machine and
need to find our secondary voltages for making a new custom transformer. Thanks!
need to find our secondary voltages for making a new custom transformer. Thanks!
Don't know about a service manual nor a schematic. However, you might be able to deduce a lot about the voltages needed, given a bit of investigation.
Anything we can do to help, or you are comfortable you already know what to do? IOW, would you like to talk about what you might try?
You might check with these guys, who used to work for EAD and still service them: https://www.nobleelectronics.net/index.html
I do not have the schematic but maybe I can provide some help...
This is what I've measured from my working unit of EAD DSP-7000 mk-II. There will be marking on the main PCBA with the following (in sequence) :-
1.) V & W - 11.23 V a.c.
2.) W & BLK - 11.41 V a.c.
3.) BLU & RD - 25.0 V a.c.
4.) Y & GR - 25.02 V a.c.
You may be able to get a new custom-made transformer with 2 windings of 11V a.c. and 25V a.c.
If possible, please try to recap all the capacitors, especially those nasty old tantalum capacitors. These fail short; killing the regulator/s and/or burning the PCB track along the way. You might also want to perform some checks first on the PSU if the fault is really a bad power transformer.
The EAD DSP-7000 mk-II is really a gem with the R2R PCM63K; sounds fantastic! Hope you'll able to get your unit working and running again.
BTW, is your unit comes with the balance output? If you do eventually get hold of the schematic, I would love to have a look at it. 🙂
This is what I've measured from my working unit of EAD DSP-7000 mk-II. There will be marking on the main PCBA with the following (in sequence) :-
1.) V & W - 11.23 V a.c.
2.) W & BLK - 11.41 V a.c.
3.) BLU & RD - 25.0 V a.c.
4.) Y & GR - 25.02 V a.c.
You may be able to get a new custom-made transformer with 2 windings of 11V a.c. and 25V a.c.
If possible, please try to recap all the capacitors, especially those nasty old tantalum capacitors. These fail short; killing the regulator/s and/or burning the PCB track along the way. You might also want to perform some checks first on the PSU if the fault is really a bad power transformer.
The EAD DSP-7000 mk-II is really a gem with the R2R PCM63K; sounds fantastic! Hope you'll able to get your unit working and running again.
BTW, is your unit comes with the balance output? If you do eventually get hold of the schematic, I would love to have a look at it. 🙂
May I ask, are those voltages measured across windings, to ground, or what? Also, are there any center-taps, or only a total of 4-wires?
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For myself, I would suggest to remove the damaged transformer and measure all windings for resistance, to find any center taps, and or to find any open windings that may have failed.
Also, wondering how it was determined that the transformer is the problem. Does it smell like burning insulation or something?
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For myself, I would suggest to remove the damaged transformer and measure all windings for resistance, to find any center taps, and or to find any open windings that may have failed.
Also, wondering how it was determined that the transformer is the problem. Does it smell like burning insulation or something?