DX7 II FD Cartridge Problem?

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Oscillator
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DX7 II FD Cartridge Problem?

Unread post by Oscillator »

Hello All,

I have just loaded my DX7 II FD with the original factory sounds using a ROM cartridge. However, there seems to be some anomalous behaviour occurring:

i) With Internal Voice 54 (SilvaBrass), every C, E, F, F#, A# and B make no sound at all. All other notes sound normal.

ii) With Internal Voice 46 (SilvaTrmpt), every C#, D, D#, G, G# and A sound far quieter than the other notes.

This happens only when the ROM cartridge is plugged into the keyboard.

When I remove the cartridge, switch off the keyboard and switch it on again with the cartridge still omitted, all notes in the "problem" voices, SilvaBrass and SilvaTrmpt, sound normal again. However on the display, a small "f" appears next to the voice name, i.e. "f INT46" and "f INT54", indicating that these voices were created using Fractional Scaling and the cartridge is not inserted.

There seem to be no other problems with the other sounds on the ROM cartridge.

Can anyone tell me whether the points highlighted in (i) and (ii) above are normal behaviour and, if not, what might be causing them? Is it likely that the ROM is faulty, or is it my keyboard?

Thanks in advance,

Oscillator.

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Clyde
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Unread post by Clyde »

That sounds like some sort of issue with the ROM cartridge. As far as voices with the "f" sounding normal when the cartridge is removed, while it may sound normal to you, they won't sound like they were intended to sound. For instance, a grand piano created using fractional scaling sounds pretty decent when operating as it should, without the fractional scaling data it sounds completely different (dull and flat, no life to it). Since all other sounds on the keyboard sound normal, I would think that the keyboard is not at fault but rather it is a cartridge fault. One other thing to check is to make sure the contacts on both the cartridge and the cartridge slot are properly aligned with their respective locations as well as with each other. And just in case, the cartridge must be pushed in all the way, it almost stops when most of the way in and then must be pushed secirely in place. You can also try cleaning the contacts on both the cartridge and keyboard slot with q-tip and rubbing alcohol to remove any dirt on the contacts.
Clyde

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Oscillator
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DX 7 II FD Cartridge Problem?

Unread post by Oscillator »

Thanks for the advice, Clyde. I'll try the cleaning you suggested.

May I ask, do you actually own a DX7 II FD cartridge, so you know for sure that mine is misbehaving? i.e. is there any possibility that Yamaha wrote the sounds in the way they come out on my keyboard?

- You will appreciate that I don't want to accuse the man who sold it to me of giving me a dud until I know for sure it's not working.

Thanks.

Oscillator.

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Clyde
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Unread post by Clyde »

I still own one of the DX7IIFDs that I bought around 1987, I rarely use the ROM cart for anything as most every sound that I use on the DX is either a highly edited version of the factory sounds or completely programmed from scratch, but I don't recall the ROM cart ever acting that way. I don't even know if I can easily put my hands on the ROM cart, that's how seldom I ever use it, don't recall seeing it for 3-4 years. I know the RAM carts have a battery that will go bad and it either won't store data or corrupts the data, but I don't think the ROM carts have a battery (at least as well as I remember).
Clyde

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Saul
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Unread post by Saul »

How often have you used the cartridge slot on your DX ? Just thinking that it could be a connection issue. The DX is an old beast now and if the car slot has not been used for quite some time it could be that some of the connections have oxidised causing corrupt data to be transmitted when the cart is plugged in. Just a possibility.

I would not have thought it was the cart although it's possible you have a duff one. The only way to tell would be to plug it into another DX7 and see if the same odd behaviour occurs.
Saul
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Oscillator
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Unread post by Oscillator »

@ Clyde. - Yes, you're right. As far as I know ROM carts have no battery, but RAMs do.


@ Saul. - I bought this DX7 II FD just over a year ago and this is the first time I've used the cartridge slot. From what I suspect, I don't think the previous owner used the slot at all. I doubt also that the original owners (the ones previous to the person I bought it from) would have used it: I found some sounds programmed into the keyboard which were probably created by them.

I've tried cleaning the contacts on the cartridge and in the keyboard but to no avail.

I think this problem now comes down to my being able to find someone in possession of a cartridge which is known to be functioning correctly so I can ask them what it does with the pair of voices in question.

Thanks for your help.

Oscillator.

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Oscillator
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Unread post by Oscillator »

Hello All,

I have been in communication with another DX7 II FD owner who also has a ROM cartridge.

I am glad to report that having tested out his cartridge, he says it behaves in the same way as mine. This provides evidence that mine is not faulty and is working as Yamaha intended.

Thanks for all your help and advice.

Oscillator.

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Unread post by Saul »

That's good news. I'm sure there will be a few other DX owners passing through who thought their cart or keyboard was faulty. Thanks for clearing that up :)
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Unread post by Clyde »

While it is good that another cart/DX7II combo gives the same results, it sounds like some sort of programming defect on the ROMs that was never corrected by Yamaha. Good to know though.
Clyde

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Cherry
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Re: DX7 II FD Cartridge Problem?

Unread post by Cherry »

Is there any DX7 owners that live in Scotland? I've bought some DX7 Cartridges off eBay and I would like them to be checked on another DX7 Keyboard before I have to reformat them to see if there are working ok. I'd appreciated the help because I've just purchased these and they don't seem to be working correctly on my keyboard.

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Miks
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Re: DX7 II FD Cartridge Problem?

Unread post by Miks »

If those cartridges are RAM cartridges the internal battery may have given up... IF that's the case you need to replace them first before you can use them with your synth - and they have to be formatted on your DX before you're able to store sounds to them.
My (key related) gear (in alphabetical order):
Ferrofish: B4000+
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Roland: D-50, D-110, D-550, PG-1000
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TX-802, YMM2
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elsongs
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Re: DX7 II FD Cartridge Problem?

Unread post by elsongs »

Buy a can of DeOxit D5 contact spray and spray it into the cartridge slot and the cartridge contacts. I had problems with cartridges until I did this a few years ago.

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Bricago
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Re: DX7 II FD Cartridge Problem?

Unread post by Bricago »

I had the exact same problem with the ROM cart for my DX7II! Here's a response from another forum to the original poster's question. And before you ask, yes, Bank 4 on the ROM shows up as unformatted.

MDA,
Your synth is working 100% and the ROM cartridge is fine. The Silva single voices #46 and #54 have a compliment note scaling set up for
each group of 3 keys so that performance #14 can be setup in dual mode to play the combination of these without losing any polyphony.
When the cartridge is out the fractional scaling isn't present so all the keys sound for each voice in the performance. I always figured
Yamaha was teaching us stuff with the ROM cartridge since the manual was so incomplete. Thanks for reminding me of this performance! I had a good time jamming out a few Toto songs (Stranger In Town & Hydra) after the cartridge was removed so all the dual notes would play. CS1 and CS2 brightened the sound and added some saw fuzz with CS1 at 8 and CS2 at 9 (0-10 scale.)

This is not the first time this scaling and micro tuning thing has caused me to wonder what was going on. You should have seen when I
sent a voice bank to my TX7! At least every other voice was tuned to some unknown key. It took some serious poking around to figure this
out. Then one of the members of the group explained about the pitch scaling.

Have fun with your DX synth let us know if anything else crops up.

Narfman

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Bricago
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Re: DX7 II FD Cartridge Problem?

Unread post by Bricago »

Just wanted to also mention that p. 21 of the "Memory Management" supplemental guide to the DX7II lists the contents of the 4 banks on the ROM cartridge. It states, "BANK 4: Unformatted - Note: On other DX7II ROM cartridges, this bank may contain microtuning data."

17 of these Supplemental Booklets for the DX7II are available as pdf's on this forum. Search "DX7II supplemental booklets."

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