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[Dan Richardson]

Looking for leads on DMP7 (yes, the one from 1987) fader belts.

[Doug Jane]

Looking for leads on DMP7 (yes, the one from 1987) fader belts.

Check on Ebay for belt suppliers. Or check O ring suppliers. Spares from Yamaha will be long gone.
There are sellers who sell belts in mixed packs. Like this one in new Zealand.
https://www.trademe.co.nz/a/motors/car-parts-accessories/parts-other-makes/electrics/listing/4634573843

[Art Welter]

Looking for leads on DMP7 (yes, the one from 1987) fader belts.

The MXL series (miniature extra light) from McMaster Carr look like they might be close:
https://www.mcmaster.com/products/cogged-belts/mxl-series-timing-belts-8/

You would have to measure to determine if the pitch of the cogs on the DMP7 belts line up, but they have a wide variety of lengths that should match up.

$4200 for eight channels when the DMP7 came out in 1987, equivalent to around $11,122 today.
Seeing faders move by themselves was a real novelty 37 years ago- "look ma, no hands" 

[Dan Richardson]

The MXL series (miniature extra light) from McMaster Carr look like they might be close:
https://www.mcmaster.com/products/cogged-belts/mxl-series-timing-belts-8/

Great lead, thanks.

[Dan Richardson]

determine if the pitch of the cogs on the DMP7 belts line up

I was surprised to find that the belts aren't toothed, and that the mechanism for moving the faders is actually a tiny tensioned loop of wire rope.

Fader 3 was missing the rope, so I moved the rope from fader 8. The rest have come back to life with exercise, except the data entry fader. Completely different mechanism, something worm drive.

[Craig Hauber]

I was surprised to find that the belts aren't toothed, and that the mechanism for moving the faders is actually a tiny tensioned loop of wire rope.

Fader 3 was missing the rope, so I moved the rope from fader 8. The rest have come back to life with exercise, except the data entry fader. Completely different mechanism, something worm drive.

That looks like dial cord methodology used for the decades from the dawn of consumer radio receivers up until the invention of digital tuners.  Those will probably still outlast current "rubber" belted ones.  I've had belts in even more recent electronics suddenly disintegrate into a tar like substance.

[Mike Caldwell]

The motor, belt and pulleys look straight out of a VHS VCR and some CD players.
The right sized O rings could work.

[Dan Richardson]

The motor, belt and pulleys look straight out of a VHS VCR and some CD players.
The right sized O rings could work.

The belts all appear to be doing their thing. The channel faders that are dragging have rope slippage. The data entry fader is something else entirely. Can't see in there to understand the mechanism.

[ProSoundWeb Community]