Manufactured by GE, the printed circuit board marked DS3815PCMA1E1E is a component for the Mark IV system. This series replaces the earlier Speedtronic systems, including Mark I and Mark II. The Mark IV is designed for steam/gas turbine management, and is built upon a system of integrated microcomputers that continuously monitor turbine performance around the clock.
The DS3815PCMA1E1E is built with seven resistor network arrays on the board. Network arrays are sometimes used for voltage division. The board also has fifty circuits, including 8-bit high-speed CMOS static RAM that works off of a single 5V supply and are directly TTL compatible, Octal D-type transparent latches and edge-triggered flip-flops with buffered output control that can be used to place the eight outputs in either a normal logic state or a high-impedance state.
The DS3815PCMA1E1E is built with two light emitting diodes (one amber, one red,) three jumper switches, four test points, and two extractor clips. These nylon clips are fitted to PCBs to help with their removal from a restricted space. They use mechanical force against a guide rack to move the board out of place, and also provide a handle to the technician so he can pull the board without touching circuitry or components.
The DS3815PCMA1E1E is factory drilled and alignment marked. It is marked 6BA03, 6DA00, and 6HA01. The board has three PCB mating connectors located on the board, including one vertical male connector and two right-angled connectors. Four nylon vertical spacers and one board to board pin are located on the DS3815PCMA1E1E to accept an optional auxiliary board.
General Electric published all manuals and datasheets for the DS3815PCMA1E1E and provided all other technical support.