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All Revision 9 and almost all Revision 7 AKD Control boards use Amphenol 3.5mm connectors for X7 and X8.
Both the header and the mating connector are bespoke items from Amphenol. Phoenix numbers for spring clamp connectors are:
| Location | Phoenix |
| Power board X1 | FMC 1.5/3-ST-3.5 |
| Control board X7,X8 | FMC 1.5/10-ST-3.5 |
| I/O option board | FMC 1.5/8-ST-3.5 |
| I/O option board |
FMC 1.5/14-ST-3.5 |
Almost all supplier connectors will fit, an exception being Weidmueller. Note only Amphenol connectors will engage the retaining nuts, so It is recommended to buy connectors without retention screws.
