DS3810MMBB1A1A: Mark IV Memory Module Built Around the DS3800HUMB

This unit is a DS3810MMBB memory module assembly from the GE Speedtronic Mark IV DS3810 family, supplied with a DS3800HUMB1B1B Universal Memory Board (UMB) mounted on it. The DS3800HUMB is the Mark IV panel's non-volatile storage card: its EPROM/EEPROM modules hold the site-specific application program and control constants that the <R>, <S>, and <T> processors of the panel's Triple Modular Redundant (TMR) architecture load at startup. Because the assembly's role follows the UMB card it carries, treat this listing as a UMB replacement packaged on its DS3810MMBB carrier — confirm with your documentation or with us that this carrier matches what your rack expects before ordering.

On the DS3800HUMB card itself, a modular connector on one edge and retention levers on the other allow the board to be pulled and reseated in the field. The front edge carries a single red status LED and a toggle switch used to place the memory modules into an erase/reprogram state. Internally, 30 jumpers and their single-pin connectors and module sockets are grouped into four quads (A, B, C, D); pin numbers repeat across quads, so any referenced pin needs its quad letter to be meaningful.

Before Replacing This Assembly, Check These First

• Seating. A modular connector or lever that walked loose during other rack work can throw the same alarms as a genuine board failure — reseat fully first.
• The memory modules, not the carrier. The application program lives on the EPROM/EEPROM modules. If your existing modules are good, they are normally moved onto a replacement's empty sockets rather than requiring new pre-programmed parts.
• Rack power quality. A sagging or noisy supply can produce intermittent checksum or configuration faults that clear after a clean power cycle and have nothing to do with the board.
• Misattributed alarms. The single LED on the UMB is a general status indicator, not a detailed diagnostic — confirm the fault genuinely traces to this card and quad before replacing the assembly.

What the 1A1A / 1B1B Codes Tell You

Here, "DS3810MMBB1A1A" identifies the carrier assembly revision, while "DS3800HUMB1B1B" identifies the memory board revision mounted on it. Both trailing codes denote specific hardware/firmware revisions, and GE's suffix system is not universally interchangeable across revisions — match both part numbers on your existing nameplates wherever possible. See our GE Speedtronic Part Number Decoder for how these codes are generally structured, and confirm with us if you are unsure which combination your panel needs.

Related Mark IV Boards

This assembly shares a Mark IV panel with other DS3800-series boards, including the DS3800HFPG Drive Control Board, DS3800HMPK Microprocessor/Regulator Control Board, and DS3800NDAC Analog Output Board — see the full lineup in our GE Mark IV DS3800 Boards collection. If your facility is evaluating a move to Mark V or Mark VI/VIe, our Mark V vs Mark VI: DS200 to IS200 guide explains how those later hardware families differ from Mark IV.

Quote Request Essentials

• Full part numbers for both the assembly and the mounted board (DS3810MMBB1A1A / DS3800HUMB1B1B)
• A photo of the nameplate(s) on your existing unit
• Turbine model/frame and confirmation of Mark IV
• Quantity needed
• Urgency/lead time

Request a Quote

This DS3810MMBB1A1A assembly with mounted DS3800HUMB1B1B 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.

General Information about the Product
Part Number	DS3810MMBB1A1A Mark IV DS3800
Description	DS3810MMBB1A1A by GE DS3810MMBB with DS3800HUMB1B1B Universal Memory Board
Condition	used Cleaned and Tested. With 1 Year Warranty.