The DS3800HMHA1E1F from General Electric is a board component designed as part of the Speedtronic turbine control system. The DS3800HMHA1E1F fits into a later Speedtronic system, namely the Mark IV. This system was introduced in 1984 as a replacement for earlier Speedtronic systems like the MKI and MKII. IT was the first Speedtronic system to offer TMR (triple modular redundant) control. While earlier systems were known for their reliability, the MKIV was still a significant improvement in decreasing downtime and improving overall reliability.
The DS3800HMHA1E1F is designed to act as an MH controller. The board is relatively small, weighing 0.63 pounds. It is fitted with two extractor clips along its front edge. These clips help technicians in both the installation and removal processes by giving a pivot point to pull the board out of rack systems while providing a safe place to hold the board during maintenance and replacement. The front edge includes right-angled connectors for cable connections as well as three LED indicators. These indicators are yellow (1) and red (2).
The rear edge of the board is taken up by a single backplane connector. This allows the board to communicate with other components within the system. The board itself is populated by integrated circuits of various designs. Most of these are marked with their original factory numbers. It also has capacitors, resistors, diodes, resistor network arrays, and many jumper switches. The board can be customized through jumper settings. Please see the original General Electric manuals and user guides for more details.