• ARP Service Manuals (Schematic Connection)
• Vintage Synth Explorer - ARP Omni 1 / 2
• Synth Repair Tips (Old Crow)
• Omni Repair thread from analog-synth
• Old Tech Synthesizer Site - ARP Omni
• Synth Museum - ARP Omni 2
• Anafrog - ARP Omni 2 Info (en français)
  

Mailing Lists

• oldsynths (moderated version of oldsynth)
• vintagesynthrepair

• The Ultimate ARP Odyssey Information Resource Page
• Mark Smart's Omni & Omni 2 pages (good stuff!)
• ARP Omni-2 User's Manual (the patch diagrams should also work on the Omni)
• ARP Omni-2 Service Manual
• ARP Fan Club (nice page - many links)