brad@kontron.UUCP (Brad Yearwood) (01/27/86)
If you are a DX7 fan into tweaking, major hacking, or just plain better
understanding, you should look at the following technical information
available from Yamaha:
SM 150 DX7/9 Service Manual $10.00
Very brief technical descriptions of functional blocks, assembly
explosions, PC board layouts, parts lists, schematics for both
DX7 and DX9. Parallel descriptions in Japanese and English.
SM 174 MIDI Data Format DX7 no charge (only if ordered with
other material, probably)
Exactly what it says. 3 pages.
SM 184 DX7 Test Program Operation $14.00
and Trouble Shooting Guide
How to operate the built-in diagnostic program. Includes a
few waveform drawings and "if you don't see this, check the
following" procedures.
SM 200 DX7 Technical Analysis $14.00
Reasonably detailed block-by-block descriptions of the
circuitry. Each section gives a fragment of the schematic
along with a functional description and some timing diagrams.
Has scope photos of various waveforms, and memory maps of the
overall system and of the FM synthesis LSI devices. Comes
with a reference schematic that may not be the most up to
date (see the service manual for production schematics).
These are available from:
Yamaha International Corporation
Attention: MMG Parts
6600 Orangethorpe
Buena Park, CA 90620
There is an additional shipping and handling charge of $1.50 per order.
They unfortunately accept only cashier's checks or money orders.
I don't know whether other manufacturers make this much information
available. It's pretty nifty that Yamaha does, and that the parts person
that I talked to told me about the other manuals when I asked about
the service manual and schematic.
My only relationship with Yamaha is as a customer.
Brad Yearwood
Kontron Electronics {voder, pyramid, loral}!kontron!brad
Mountain View, CA