DS3800HMPJ1A1D MICROPROCESSOR BOARD

The DS3800HMPJ1A1D is a General Electric Mark IV circuit board.  This board fits within the MKIV turbine control system designed to manage industrial gas and steam turbines of various sizes and complexity.  The Mark IV was the first of the Speedtronic systems to increase reliability by using a TMR (triple modular redundant) arrangement.  This use of duplicated processors voting on all inputs allowed for less downtime within the overall system.

Designed with a backplane connector on one short edge and a cable connector on the other, the DS3800HMPJ1A1D is just one version of this board available within our warehouse stock.   The board is marked with its ID number as well as several codes to aid with the position, wiring, and other board specifications.  Codes may vary according to the individual unit sold.

The DS3800HMPJ1A1D is built with a vertical pin connector.  This is near four standoffs mounted to the board surface, allowing the addition of a secondary daughterboard that will communicate with the DS3800HMPJ1A1D through the cable connector.   The board has over fifty integrated circuits including multiple PROMs/EPROMs.    Other board components include LED indicators (one yellow, one red), resistor network arrays, resistors, diodes, capacitors, test points, and jumper switches.  Jumpers are used to change settings on the board; this allows the board to be customized as the end-user requires. GE documentation will give more information on jumper settings.  However, jumpers on your replacement board should typically match those of the board you are replacing.