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Date: March 4, 2019
Doc: D00282-01
Rev: 1
INTRODUCTION
The Oberheim OB-X was sold in 4-voice, 6-voice and 8-voice variations. Our voice expansion kits were
developed for those wanting to upgrade a 4-voice or 6-voice model, and for those wanting to add multimode
filter support.
Please note: There are also video installation & calibration guides in addition to this pdf document:
OB-X Custom Parts Installation
OB-X Calibration
OB-X Additional notes on filter calibration
CONTENTS
4-Voice Expansion
(4) OB-X Voice Card Assemblies
(1) OB-X Motherboard Assembly (Expansion)
(1) Motherboard Tray
(1) Filter Control Board
(4) 10-Position Connectors
(1) 5-Position Connector
(1) 4-Position Connector
(1) 4-Position Power Connector
(1) 4-Position DF13-style connector (pre-plugged to voice motherboard)
Mounting hardware for mounting motherboard tray, voice cards, and filter control board
8-Voice Kit
(8) OB-X Voice Card Assemblies
(1) OB-X Motherboard Assembly (Primary)
(1) OB-X Motherboard Assembly (Expansion)
(1) Motherboard Trays
(1) Filter Control Board
(7) 10-Position Connectors
(1) 10-Position Connector w/ long wires for gate & CV I/O
(1) 5-Position Connector
(3) 4-Position Connectors
(1) 4-Position Power Connector
(2) 4-Position DF13-style connector (pre-plugged to voice motherboards)
Mounting hardware for mounting motherboard tray, voice cards, and filter control board
OB-X Voice Expansion Kits
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Summary of Contents for Abstrakt Instruments Oberheim OB-X
- Page 1 OB-X Voice Expansion Kits INTRODUCTION The Oberheim OB-X was sold in 4-voice, 6-voice and 8-voice variations. Our voice expansion kits were developed for those wanting to upgrade a 4-voice or 6-voice model, and for those wanting to add multimode filter support.
- Page 2 INSTALLATION - BOTTOM MOTHERBOARD The new bottom assembly for voices 1-4 comes partially-assembled & fully calibrated. If you are only installing a 4-voice expansion please skip to the section Top Motherboard Installation. Remove the top tray assembly to access the bottom motherboard a) Remove the (6) connectors between the upper voice tray and mainboard.
- Page 3 Remove the bottom voice assembly a) Remove the (7) connectors between the upper voice tray and mainboard. The connectors can be discarded as new connectors are included in the kit. Also remove the connector to the output jacks. b) In order to remove the voice motherboard voice cards 2-4 must be removed first. To remove the voice cards remove the (6) 6-32 screws holding down each card and pull out the cards.
- Page 4 Install the new primary Voice Motherboard assembly a) Place the new primary motherboard in the bottom of the unit and align the outer holes. b) Note that voices cards 2-4 have been temporarily installed with (3) screws each. This is because they need to be removed so that the motherboard can be screwed down.
- Page 5 INSTALLATION - TOP MOTHERBOARD Place the Upper Voice Motherboard assembly a) The upper board ships completely assembled & calibrated. b) If the unit has original 1 ½” hinged standoffs installed remove them. Install the (3) 1” standoffs onto the brass hinges that are pre-installed on the motherboard tray: d) Place the upper motherboard assembly above the primary motherboard and align the standoffs with the holes in the bottom of the enclosure.
- Page 6 c) Note: There is no connection to the 4-position header at the bottom of the upper voice motherboard. d) Install the 5-position voice sum connector from the bottom voice motherboard to the upper board. These are the connections at the bottom-right of each voice motherboard. e) Dress the small 12”...
- Page 7 INSTALLATION – FILTER CONTROL BOARD Remove screw from CPU Board Note: If the Encore MIDI Kit is installed it should be first removed to access the CPU board. Swing open CPU Board and remove IC31 & screw shown...
- Page 8 Install the included male-female standoff where shown Install the Filter Control Board into socket IC31. Secure it to the standoff with a 6-32 screws & lock washer...
- Page 9 Connect the 4-position connector(s) from the motherboard(s). Either connector can be used w/ either cable - they are in parallel...
- Page 10 FILTER CONTROL BOARD – OPERATION The two switches on the filter control board determine whether the NOISE FULL & NOISE HALF buttons control the noise level or the filter mode. When the left (HP) switch is in the up position the button will select highpass mode and NOISE FULL noise full no longer works.