DS3815MMBB1A1A: DS3815-Series Carrier for the DS3800HUMB Memory Board

This DS3815MMBB1A1A is a memory module assembly from GE's Mark IV DS3815 family, supplied with a DS3800HUMB Universal Memory Board (UMB) mounted on it. The function of the assembly follows the board it carries: the DS3800HUMB stores the panel's site-specific application program and control constants on EPROM/EEPROM modules, data that the <R>, <S>, and <T> processors of the Mark IV's Triple Modular Redundant (TMR) architecture load at every startup. Before ordering, confirm with your documentation (or with us) that a DS3815MMBB carrier is what your rack is built to accept, since Mark IV memory modules were produced on more than one carrier design.

The mounted DS3800HUMB itself uses a modular connector on one edge and retention levers on the other for quick field removal and reinsertion, plus a single red status LED and a toggle switch for placing the memory modules into an erase/reprogram state. Its jumpers, single-pin connectors, and module sockets are grouped into four quads (A, B, C, D); because pin numbering repeats in each quad, a test point reference is only meaningful with the quad letter attached.

Troubleshooting Checklist Before Replacement

Memory-related alarms on a Mark IV panel are commonly blamed on this board when the actual cause lies elsewhere. Before replacing the module, check:

• Connector and retention lever seating — a board that shifted during other rack maintenance can fault identically to a genuinely bad one.
• The EPROM/EEPROM modules themselves, since the application program lives there; existing modules are normally carried over to a replacement carrier rather than sourced new.
• Rack power quality — a sagging or noisy supply can trigger intermittent checksum or configuration faults that clear after a clean power cycle.
• Whether the alarm and quad genuinely trace to this board, since its single LED is a general status indicator rather than a detailed self-test.

What the Part Numbers Tell You

"DS3815MMBB1A1A" is the carrier assembly's part number and revision, while "DS3800HUMB" identifies the memory board function mounted on it. GE's trailing suffix codes denote specific hardware/firmware revisions that are not automatically interchangeable across variants, so match both part numbers against your existing nameplates wherever possible. Our GE Speedtronic Part Number Decoder explains how these codes are generally structured, and we're glad to confirm your specific combination before you order.

Boards That Share This Mark IV Panel

A Mark IV panel using this memory module will also typically include boards such as the DS3800HFPG Drive Control Board, DS3800HMPK Microprocessor/Regulator Control Board, and DS3800NDAC Analog Output Board — see our full GE Mark IV DS3800 Boards collection. For the broader GE Speedtronic product range, visit our GE Speedtronic Turbine Control Boards collection.

Information to Include in Your Quote Request

• Full part numbers for both assembly and board (DS3815MMBB1A1A / DS3800HUMB)
• A photo of your existing nameplate(s)
• Turbine model/frame and confirmation of Mark IV
• Quantity required
• Urgency/lead time

Request a Quote

This DS3815MMBB1A1A with mounted DS3800HUMB is used, cleaned and tested, with a 1-year warranty. We ship worldwide DDP (Delivered Duty Paid), accept purchase orders, and respond to quote requests within 24 hours. Submit a Request a Quote and we'll confirm it matches your turbine and panel configuration before shipment.

General Information about the Product
Part Number	DS3815MMBB1A1A Mark IV DS3800
Description	DS3815MMBB1A1A by GE DS3815MMBB with DS3800HUMB Universal Memory Board
Condition	used Cleaned and Tested. With 1 Year Warranty.