The IC3600QSPA122A103A is a servo potentiometer board. This product was developed by General Electric (GE) as a component in the Speedtronic Mark I-II series. The Mark I, which was introduced in 1969, and the Mark II, introduced in 1973, were the earliest series created for the Mark turbine management line.
The IC3600QSPA122A103A features four large relays, also known as inductors, which occupy much of the surface of the board. These relays contain white labels which feature the parts numbers CR120G40806FA and 68A997277A02. These relays have a voltage of 28 VDC (volts DC). These four relays are attached to a line of metal prongs by a series of colorful wires. These metal prongs are arranged in a line along the right edge of the IC3600QSPA122A103A. The prongs are labeled by the numbers one (1) through fifty-one (51), typically increasing by fives. The prongs are used to connect the IC3600QSPA122A103A into the rest of the turbine control system. A series of resistors is situated at the top of the IC3600QSPA122A103A. While many of the resistors are light blue with multi-colored bands, some others may be solid black in color. They are all identifiable by the reference designator R, from R10 to R28. Sitting adjacent to these resistors is a group of small diodes. The diodes are solid black and they are labeled with the reference designator CR, from CR1 to CR4. The full part number of this part, which is IC3600QSPA122A103A, can be found printed on the surface of the board at the top left corner.