they are not genuine originals but good copies,nobody sells factory originals but me and thats because I am going out of business,unfortunately I don't have anymore original arp schematics available,only copies.
http://www.webstore.com/39380,user_id,35966,parent_id,shop
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From: vintagesynthrepair@yahoogroups.com
To: vintagesynthrepair@yahoogroups.com
Date: Sat, 1 Nov 2014 11:22:31 +0000
Subject: [vintagesynthrepair] re: WTD: original ARP Quadra schematics
Hi
I use MusicParts.com for all my ARP schematics/service manuals etc. A little pricey but they are genuine originals so of the highest quality and ship world-wide.
http://www.musicparts.com/products.asp?Company=Arp
They have service manuals for the 2641 and 2543 variants of the Quadra.
Hope this helps