Scans of selected Hammond schematics and wiring diagrams

For Leslie schematics go to the Leslie schematics page

Most of the scans are from Xeroxes of old manuals and are ment as help for home-tinkerers like myself, so the scan quality may vary. Format is JPG or GIF unless otherwise stated.

Organs, preamps, power amps
 

• AO-28 Preamp for B-3/C-3/A-100/RT-3/D-100 
• AO-28 Component layout (gif - thanks to Mr. A. Nonymous)
• AO-10 Preamp for B-2/C-2/RT-2 (gif)
• AO-10 Preamp - underside view (gif)
• Preamp - BV/CV/RT(gif)
• Preamp - E (serial # 8000-8472)
• Preamp - A/B/BA/C/D (early)
• Preamp - A/B/BA/C/D (later) + G
  
• M schematic (gif)
• M-2 schematic diagram (late version serial # above 25254)
• M-2 wiring diagram (late version serial # above 19000)
• M-3 Schematic (early version with field coil speaker, serial # 48000 to 90485)
• M-3 wiring diagram (for above version)
  
• M-3  (late version with PM speaker) Schematic
• AO-29 Component layout (Early version, field coil)
   
• M/M-2/M-3 Generator/frequency/key charts  Locate frequencies on the generator, keyboards, manual wiring harness and so on.
  Definitely needed when troubleshooting a missing tone or frequency. Will also work for M-100 organs except for the extra pedal tone found in these series (M-100 series has 13 pedals, other M organs only 12), and the percussion trigger drawbar on an M-100 is the 7th, not the 9th. (Scans donated by Rich Horton).
  
• M-100 AO-29 (mid 60s version with AO-44 reverb amp) schematic
  
• M-100 wiring diagram (for above version)
  
• M-100/A-100 AO-44 reverb amp schematic (scanned by Harvey Olsen)
  
• M-100/A-100 AO-35 reverb amp schematic (early A-100 and very early M-100)
  
• M-100 AO-67 amp and organ schematic (latest version)
  
• M-100 AO-66 reverb amp schematic (latest version)
  
• L-100 (later version with LDR expression control and AO-47 vibrato amp)
  (originals supplied by Harvey Olsen).
• L-100 (early version with resistive expression control and AO-41 vibrato amp)
• L-100 Wiring diagram
• Porta-B Wiring diagram (2 versions PDF zipped)
  
• T-500 series schematics
• T-Series schematics (T-100 - T-400) - work in progress, more pages will be added as I scan them
• Partial T-100/200/300/400/XTP manual (zipped PDF) (Very large file)
  
• E-100 series schematics (gif format)
• R-100 series schematics (kindly scanned by Les Lacy)
• H-100 series schematics and wiring diagram (kindly scanned by Scott Streszoff)
   
• Hammond Solid State Component Cross-Reference (zipped gif)
  Scans kindly supplied by Søren Poulsen.
  The document cross references Hammond part numbers found on the schematics to generic part designations
   

• X-5 (non tonewheel - zipped) - Thanks to Søren Poulsen for this
  
• S-100 chord organ (pdf and gif)
• D-100 Main schematic
• D-100 Power amplifier
   
• Hammond Pedal Solo Unit Revision A
• Hammond Pedal Solo Unit Revision B
• Hammond Pedal Solo Unit Revision C, D and E
• Hammond Pedal Solo Unit Service Manual (all types, PDF-file)

Hammond Tone Cabinets

• Series 10 tone cabinet
  
• PR-40/QR-40 (early units)
  
• P-40/Q-40 (including instruction sheet, zipped)
  
• HR-40/H-40 (various versions, zipped)
  
• JR-20 (early units)
• JR-20 (code 'B')
• JR-20 (code 'C' with bass compensation switch)
  
• PR-20 (including instruction sheet, zipped)
   
• H-1 (Used in tone cabinets D-20, F-40, FR-40)
• HR-1 (Reverb version of H-1 used in tone cabinets DR-20, ER-20 and FR-40)

The following schematics can be found at: http://theatreorgans.com/hammond/faq/a-100/a-100.html as part of the Hammond-Leslie FAQ:

• A-100 main schematic (with AO-28 preamp)
  (everything except the internal speaker system and reverb is the same in B-3/C-3/RT-3 and D-100)
• A-100 main wiring diagram
• A-100 AO-39 Power amp schematic
• A-100 AO-39 Power amp wiring diagram

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These are excellent scans!