Table 3-1. PADS Test Set Controls, Indicators, and Connectors

ARMY TM 5-6675-238-14 MARINE CORPS TM 08839A-14/1 Table 3-1. PADS Test Set Controls, Indicators, and Connectors NOTE This table covers only items used by the opera- tor; items used by higher level maintenance personnel are covered in instructions for the appropriate maintenance level. Control, indicator, or connector Function Signal processor unit (figure 3-1) +28 VDC fuse indicator Lights when fuse in + 28V power supply AC line has blown BLOWER fuse indicator Lights when fuse in blower inverter power line has blown + 5 VDC fuse indicator Lights when fuse in + 5V power supply AC line has blown -15 VDC fuse indicator Lights when fuse in -15V power supply AC line has blown +15 VDC fuse indicator Lights when fuse in + 15V power supply AC line has blown SPU ON switch-indicator Controls application of primary AC power to the SPU and lights when power is applied FAILURE/ACTION indicator Indicates the cause of a failure or operator action required during SPU self-test LAMP TEST switch Causes all front panel indicators to light when pressed and a sequence of numbers to be displayed on FAILURE/ ACTION indicator. Does not function when SELF TEST switch-indicator is activated SELF TEST switch-indicator Used to activate SPU self-test. Lights when activated. Does not function when in lamp test PARITY ERROR/VERIFY ERROR PARITY ERROR lights if a parity error occurs while the indicator SPU is reading tape or while being addressed by the computer serial data bus. A tape error will cause the tape reader to stop on the faulty character REVERSE switch-indicator MEMORY LOAD switch-indicator VERIFY switch-indicator IMU FAIL/COMP FAIL indicator VERIFY ERROR lights if data loaded into computer mem- ory did not verify correctly when checked against the tape data from which it was loaded. Such an error will cause the tape reader to stop on the character group which did not verify correctly Used to reverse direction of tape on tape reader. Lights when activated Causes tape reader control circuitry in SPU to be initialized and issues run command to tape reader, Lights when activated Causes the computer to compare the data that was loaded into memory with the data being reread from the tape. The tape will stop on a character group that is not properly verified. Lights when activated Indicates a failure in the IMU and/or computer 3-5