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Abstrakt Instruments Oberheim OB-X Manual page 4

Voice expansion kits

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3
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. Remove the (3) screws
holding each card down and remove them (it is not important to reinstall the voices in the same slot).
c) Install (15) 6-32 x ¼" screws w/ lock washers to hold down the motherboard. All new hardware is
included – old hardware does not need to be re-used.
d) Once the motherboard is installed replace voice cards 2-4. They are hard to install! Make sure to
place even pressure on all connectors (especially "G") and press until firmly seated.
e) At this time you don't need to install the screws & lock washers to hold down the voice cards. Do this
later after the install has been tested.
f) Install the (7) new connectors between the voice motherboard and mainboard.
g) Note: The kit includes a new 10-position connector (connector L/M) with long wires to connect to the
CV & Gate I/O jacks. The original connector can be used if it is ok and you don't want to solder the
new wires.
h) Reinstall the output connector to the output jacks.
i)
Dress the small 12" long 4-position cable to the left of the motherboard. It will plug into the Filter
Control Board that will be installed later.

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