DS3800NSFC1J

GE Speedtronic Mark IV DS3800NSFC1J is a System Firing Board and it's a part of the Mark IV Series. It's built to take a small auxiliary card (DS3800DSFC) that allows the motherboard access to an additional potentiometer when attached. The auxiliary connects by two board-to-board pins and is secured in place. Four nylon pins already affixed to the DS3800NSFC1J surface sustain it. One light-emitting diode, branded "IMOK," is included in the DS3800NSFC1J. This LED is amber in color.

• There are twelve test points on the board, as well as two PCB mating connectors. 218A4637-P4 9707 is the marking on one of these connectors, which is a right-angled male connector. The other connector, which is similarly a right-angled connector, is found on the board's left edge.
• Near the top edge of the DS3800NSFC1J is a row of spare PTH. It has nine transistors, one multi-positional jumper switch, and five resistor network arrays. For voltage division, resistor arrays can be employed. There are twenty-eight circuits in the DS3800NSFC1J.
• Oscillators, hex inverters, octal d-type transparent latches, and quad 2-input positive NAND buffers are all examples of this.