[sdiy] Sequential Pro-FX 500 schematics

[Nicolás Dinapoli Fariña]

I have the same ones as you, plus this one:
SEQUENTIAL_500-PRO-FX_SERVICE_MANUAL.pdf


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SEQUENTIAL_500-PRO-FX_SERVICE_MANUAL.pdf


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***FIN DEL COMUNICADO*** 

    El domingo, 11 de septiembre de 2022, 08:32:35 ART, Tom Wiltshire <tom at electricdruid.net> escribió:  
 
 Hi All,

There are schematics/preliminary service manuals floating around for *most* of the modules of the Sequential Pro-FX programmable rack effects system from the early 1980's, but information on certain modules is extremely sketchy. Here's a review, if you're curious:

    https://www.muzines.co.uk/articles/sci-pro-fx-500/6152

Does anyone have schematics or more information on these, please?:

    510 Phaser
    
    518 Reverb (spring tank mounted in a 1U 19" rack)

    522 Flanger / Chorus
    
I've got info about these others:

    512 Distortion

    514 4x2 Mixer

    516 Parametric EQ

    520 Transpose / Sync

    524 Digital Delay 

They're interesting designs because they're very much at that transitional period between fully-analog and more-digital. There's quite heavy use of the 7524 8-bit MDAC for digital level control (and more), but there are also lots of examples of CA3280's doing a similar job, and filtering provided by CEM3320s and so on. It's a right old mixture!!

Thanks for any clues or help you can offer,

Tom
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