The Oberheim Files

Under construction: latest update 2023-01-17

Technical information for Oberheim products

These files are provided as a public service by Electrongate.

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Operating System ROM Images

OB-Xa Documents
• Factory Patch Book

OB-1 Drawings
• OB-1 Wiring Block Diagram
• OB-1 Pot Board Schematic
• OB-1 Performance Board Schematic
• OB-1 Programmer and Touch Schematic
• OB-1 Synthesizer Board Schematic (1 of 3)
• OB-1 Synthesizer Board Schematic (2 of 3)
• OB-1 Synthesizer Board Schematic (3 of 3)
• OB-1 Power Supply Schematic
• OB-1 Envelope Generator Chip Board
• OB-1A Wiring Block Diagram

CASS-1 Drawing (Cassette interface for OB-1 and 2-voice/4 voice programmer)
• CASS-1 schematic (1 of 1)

DMX Drawings
• DMX Processor board schematic (1 of 3)
• DMX Processor board schematic (2 of 3)
• DMX Processor board schematic (3 of 3)
• DMX Processor board parts layout
• DMX Switch board schematic
• DMX Switch board parts layout
• DMX Bass voice card schematic
• DMX Mark II voice card schematic
• DMX Cymbal #1 voice card schematic
• DMX Cymbal #3 voice card schematic
• DMX Memory Expansion schematic
• More to come...

DX Drawings
• DX main board schematic (1 of 7)
• DX main board schematic (2 of 7)
• DX main board schematic (3 of 7)
• DX main board schematic (4 of 7)
• DX main board schematic (5 of 7)
• DX main board schematic (6 of 7)
• DX main board schematic (7 of 7)
• DX main board parts layout diagram
• DX front panel schematic
• DX front panel parts layout diagram

DXa (DX with factory MIDI) Drawings
• DXa main board schematic (1 of 6)
• DXa main board schematic (2 of 6)
• DXa main board schematic (3 of 6)
• DXa main board schematic (4 of 6)
• DXa main board schematic (5 of 6)
• DXa main board schematic (6 of 6)
• DXa switch board schematic (1 of 1)

Stretch (DX) Documents
• Stretch schematic (1 of 3)
• Stretch schematic (2 of 3)
• Stretch schematic (3 of 3)
• Stretch parts layout diagram
• Stretch connection photos

Prommer Documents
• Prommer User's Guide (pdf file - 279K)
• Prommer Service Manual and Programmer's Guide (pdf file - 63K)
• Prommer front panel parts layout
• Prommer main board parts layout
• Prommer front panel schematic (page 1 of 2)
• Prommer front panel schematic (page 2 of 2)
• Prommer main board schematic (page 1 of 5)
• Prommer main board schematic (page 2 of 5)
• Prommer main board schematic (page 3 of 5)
• Prommer main board schematic (page 4 of 5)
• Prommer main board schematic (page 5 of 5)

DSX Documents
• DSX Service Manual (38.1 MB pdf file)
• DSX ECOs (Engineering Change Orders) 201 through 217
• DSX Revision 3.01 Software Operation Guide (Part of ECO 213)
• DSX main board schematic (page 1 of 3)
• DSX main board schematic (page 2 of 3)
• DSX main board schematic (page 3 of 3)
• DSX early sync circuit
• DSX front panel schematic
• DSX rear panel schematic
• DSX external keyboard schematic
• DSX main board parts layout
• DSX front panel parts layout
• DSXTEST1.BIN -- DSX test EPROM image (2732)

OB-8 Documents
• OB-8 Calibration procedure (pdf file - 4.25MB)
• OB-8 MIDI interface schematic

OB-SX Documents
• OB-SX Service Manual (pdf file - 52.2MB)

Xpander Documents
• Engineering Change Orders (ECOs)

This page maintained by Paul J. White