(Also see EL-3161.) This board lives inside the CCD controller. The boards major function is to receive signals and power supply voltages and then send them out to the CCD dewar electronics box. The board is set-up to supply two CCD signal chains. That is, it contains two sets of input and output connectors for power and miscellaneous signals. It also has an output connector for communicating with the EL-1183 Shutter Control box. This board can be loaded for either one or two CCD signal chains. If only one CCD is to be used, the connectors P4 and P6 are not installed.

Sheet 1

At the top left-hand corner of the drawing are two connectors, P1 and P4. These connectors are wired directly to the indicated power supplies. Below these connectors is P5, which sends and receives signals from the Utility support board. The output signals consist of temperature control lines, the shutter command signal, and the analog switch enable. The +5VD-UTIL_SUPPORT_1 line is the 5 volt line that originates on the EL-3193Utility Support board. This line is passed along to the EL-3192 analog switch board to allow the use of an opto-isolator to receive the ANALOG_SW_EN signal. With the exception of the SHUTTER_CLOSE signal, all of the other shutter related signals are status line that go back to digital inputs on the SDSU Utility board. On the right-hand side of the sheet is the DB9 connector that connects to the EL-1183 Shutter Controller. Again, the SHUTTER_CLOSE signal is an output and the rest of the signals are input from the shutter controller.

Sheet 2

The top half of the sheet shows the two 17-pin MS-style output connectors. These connectors are mounted on the panel that screws onto the back of the CCD controller chassis. The cable from this connector, along with the umbilical cable, are the two cables that connect the CCD Controller with the CCD dewar electronics box(es). Each connector passes the +5 volt and +/-16 volt power supply voltages. Also passed are the heater, temperature diode, and analog switch enable signals. The bottom of the sheet shows the spare signal lines that are available for future use. When not in use, these jumpers should be installed to tie the associated wires in the cable to ground.