Trying to revive a Yamaha SPX2000

[LeeYoo]

Maybe it has a lithium button cell memory backup that has to be replaced.

You then have to reset the unit.

[Zeppelin]

Yes, it has the CR2032 lithium battery.
Anybody know how to reset it if I replace the battery?

[LeeYoo]

Did you already measure the battery. It has to be 3volt.

Before you replace the battery, shorten the terminals of the HOLDER for a few seconds, to empty any voltage left in caps. Then replace the battery.

Sorry, I dont know how to, or if you have to reset.

[S2udio]

Service manual
Multipart rar file in 3 parts
Yamaha SPX2000 Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics

[Zeppelin]

I just measured the battery, it's shows 3,2V. So that should be ok.

Thanks for the link S2udio!
But I guess I am not pro enough to fix it alone without any help.

So, has this happened to anyone else?
The display lights up. It's blank, but there are black squares on the uppermost line
No buttons light up.

[Zaichornok]

Hi Zeppelin.
Did you have any joy with reviving that SPX 2000?

[Zeppelin]

Unfortunately no!
I didn't pursue this any further, so it's still dead as a dodo.

[S2udio]

Sounds like a CPU clock signal missing,maybe missing 3.3v rail

[Radardoug]

Check the power supply.

[Ike Zimbel]

+1 on that. Have a look around this forum for a couple of SPX-90 threads that deal with power supply issues. Any piece of gear with an SMPS, that "kind of lights up but doesn't work", or "works sometimes..." or, "works but takes a while to turn on fully", or "was working fine for years, until I turned it off for a day or two and now it won't power up" are ALL symptoms of capacitor failure in these kinds of power supply.
Best,
Ike

[Zeppelin]

Thanks for the tip!
I'll try recapping the psu and see what happens!

[TSM]

Experienced the same problems, would not initialise, then last week would not work at all. I bought a new supply from Yamaha...didn't have time to play around and repair, not only that there are no schematics for the psu as Yamaha buy them from another company...anyway, pop the hood. 4 screws to remove, input/output connectors, job done in 30 secs. So far so good, has booted first time. Also replaced the 2032 while it was apart. Hope this helps.