Hi guys. I have not worked with the SSC 6010, but with the miprom 21 ADC and DDC models I have some experience. but maybe some documentation of the function of each led of these Models 21 can be of help.

Top led on all three boards should blink simultaneous. If NOT, CHECK MIPROM 21 power supply for proper voltages If OK voltages check okay and still is not communicating, MSU, PIO, CPU, or CARDRACK could be bad.

Check LED2 on the MSU, LED2 on the CPU, and LED4 on the PIO BOARD for proper operations. These leds will change states when an input changes states.

If LED2 on the MSU BOARD is seen blinking fast with no inputs changing, check SS for 110vac to 125vac. If the voltage is too high or too low, tap 2PT transformer for proper voltage. If OK, then replace RELAY PILOT BOARD.

If LED4 on the PIO BOARD is seen blinking fast with no inputs changing states, check SS for 110vac to 125vac. If voltage is too high or too low, tap 2PT transformer for proper voltage. Measure each input for proper voltage (Below 50vac, add 5K resistor from CSV to input board terminal to pull up voltage). If okay, then remove one input board at a time until led blinks normally. Replace input board that makes LED 4 blink fast. Also remember it is possible to have more than one bad input board.

If LEDs on the RPB (RELAY PILOT BOARD) blink on and off every two seconds, check Miprom 21 power supplies for shorts and/or grounds

LED3 on the CPU should be LO.

If LED3 is HI check for proper insertion of the PROM BOARD and CPU BOARD, or replace CPU BOARD


CPU BOARD LED FUNCTIONS

LED1: Used in conjunction with LED1 of MSU BOARD and LED3 of PIO BOARD to indicate communications between all three boards. All three LEDs should blink in unison to show
that all three boards are communicating properly with each other.

LED2: Used to show that one or more inputs have changed states on MSU BOARD or PIO BOARD. LED2 will change states every time either board informs the CPU BOARD that
one of its inputs have changed states.

LED3: In the field this LED has no function. When first powering up LED3 will be lit. When proper communication is established, this LED will turn off. If this LED is seen blinking,

If LED is on continuously, verify that the PROM BOARD ribbon cable is plugged all the way into the CPU BOARD and that the PROM BOARD dip switches are in the proper location.

I hope it helps