The Modifications Board is fairly straightforward to fit in a 208r2, 208r2.1 or 208p module. Mounting is best done before the motherboard is attached to the front panel. In addition to the board and module you will need:
Two nylon M3 standoffs (12mm)
Four nylon M3x6 screws
22 or 24AWG wire
A soldering iron
An SPDT switch which is shallow enough to fit between the motherboard and the front panel (eg: CK 7101SDZBE)
A drill with an appropriately sized bit for the bush of the selected switch
Insulating tape (eg: 3M 6/9mm Kapton tape)
The board should be mounted behind the sequencer sliders, using the redundant slider mounting holes as fixing points. Nylon standoffs and screws are recommended due to the proximity of exposed traces to these holes, however metal screws and standoffs can be used if insulating washers are also fitted. If the motherboard is already fitted to the panel and you do not want to remove it, you can used double ended snap in standoffs (eg: Harwin R6009-00, however these will require that the holes be drilled out to 4mm diameter,) but if fitting this way it will be difficult or impossible to implement the modulation oscillator range switch.
A hole should be drilled in the front panel for the modulation oscillator range switch, in a position where it will not foul on any components underneath. Insulating tape should be applied to the front of the motherboard beneath this location, and ideally the connections to the bottom of the switch should be insulated with heatshrink tubing. This photo shows the recommended location for the additional switch:
Connection points for the current version of the board (marked 208-13+ / REV 3.0 / 20200605) are as shown in this diagram:
Earlier revisions of the board can be wired according to the diagram here.
It is recommended to attach the wires, with the exception of the “OUT” wire to the indicated solder joints on the motherboard beneath the Molex headers that the cards plug into, then route them up through the unused mounting holes underneath the modification board, taking care to place them so that they will not foul any of the sliders. They should be secured in place with a good quality tape. The “OUT” connection should be made on the back of the motherboard. Make sure there is plenty of slack on the wiring to the modulation oscillator range switch so that, if necessary, the panel and motherboard can be easily pulled apart.