DX7 Cartridge. Where is the battery???

philip · Post by **philip** » Thu Jun 30, 2016 2:58 am

Hi

Wanted to change battery in my dx7 symphony card, opened it, and - where's the battery?

Post by **rhino** » Thu Jun 30, 2016 5:08 am

None. memory chips are EEPROM's. Save the data without external power. Slower than static RAM, but plenty fast enough for synth patch data. Same basic carts used by Ensoniq.

philip · Post by **philip** » Thu Jun 30, 2016 3:24 pm

rhino wrote:None. memory chips are EEPROM's. Save the data without external power. Slower than static RAM, but plenty fast enough for synth patch data. Same basic carts used by Ensoniq.

So, now it's not working. Patches are storing with mistakes and strange names, and sounding weird. Any chance to fix it?

Yekuku · Post by **Yekuku** » Thu Jun 30, 2016 9:26 pm

Do other cards work as expected?
You 'd better confirm that the switches are working right, dirty switches can make intermittent contact. You can try cleaning them with a few drops of rubbing alcohol or contacts spray.
Other than that I cant think of any other failure except the eproms. Maybe it could be possible to find another working card and copy the eproms ?

philip · Post by **philip** » Thu Jun 30, 2016 10:13 pm

Yekuku wrote:Do other cards work as expected?
You 'd better confirm that the switches are working right, dirty switches can make intermittent contact. You can try cleaning them with a few drops of rubbing alcohol or contacts spray.
Other than that I cant think of any other failure except the eproms. Maybe it could be possible to find another working card and copy the eproms ?

I have a few cartridges like this, all work good, except this one.

Post by **rhino** » Fri Jul 01, 2016 4:37 pm

The orange blob in the upper left may be a tantallium cap. They go bad. Other than that, a good cleaning of the contacts on the cart and in the synth.

philip · Post by **philip** » Fri Jul 01, 2016 5:57 pm

rhino wrote:The orange blob in the upper left may be a tantallium cap. They go bad. Other than that, a good cleaning of the contacts on the cart and in the synth.

Thanx Bill!

Post by **synthRodriguez** » Thu Jul 07, 2016 12:26 pm

I've got one for sale on Reverb if you can't make it go.

Jabberwalky · Post by **Jabberwalky** » Thu Jul 07, 2016 1:35 pm

Bill knows what's up. Same as the old NES carts. Alcohol would be my first try.

DX7 Cartridge. Where is the battery???

DX7 Cartridge. Where is the battery???

Re: DX7 Cartridge. Where is the battery???

Re: DX7 Cartridge. Where is the battery???

Re: DX7 Cartridge. Where is the battery???

Re: DX7 Cartridge. Where is the battery???

Re: DX7 Cartridge. Where is the battery???

Re: DX7 Cartridge. Where is the battery???

Re: DX7 Cartridge. Where is the battery???

Re: DX7 Cartridge. Where is the battery???