The IC693CHS391 is the 10-slot modular CPU baseplate documented for the GE Series 90-30 platform. The separate left-hand position is reserved for the power supply. Slot 1 is marked CPU/1 for the modular CPU or a specified special option module, while slots 2 through 10 accept supported I/O or option modules.

This is not an Expansion baseplate. It is the single CPU baseplate for rack 0 and provides the right-side 25-pin female I/O-bus connector used to attach approved Expansion or Remote baseplates. For an item marked IC693CHS391M, keep the M suffix as part of the supplied nameplate identity and verify it before replacing the rack.

Send the complete IC693CHS391M label, CPU and power-supply catalog numbers, a full rack photograph and the expansion-cable layout. We will compare the requested chassis with the installed Series 90-30 architecture.

Need to replace an IC693CHS391M without disturbing the installed rack layout?

Send the complete IC693CHS391M nameplate, the installed CPU and power-supply catalog numbers, a slot-by-slot module list, the connected baseplate types and a clear photo of the 25-pin expansion-cable route. Myrtle will check that the requested unit is the rack-0 CPU baseplate-not an IC693CHS392 Expansion or IC693CHS393 Remote baseplate-and review the expansion-chain arrangement before quotation.

Photograph the complete rack-zero assembly

Insert one clear front image showing the IC693CHS391M nameplate, the separate power supply, CPU/1, slot numbers 2–10 and the right-side expansion connector. Include a second close view of the full suffix and revision marking.