DX7 Cartridge. Where is the battery???

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philip
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DX7 Cartridge. Where is the battery???

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? Image

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

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?

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

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 ?
It is all about sharing...

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

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.

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

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

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!

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

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.

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

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.

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