Installation
Model SCS-120 Multibus Power Supply Card
Description
The SCS-120 provides power to the SCS-150 through the multibus backplane. The SCS-120 also monitors the SCS-150 condition, the SCS-110 Modem Power Supply Card voltage output, and its own internal voltages.
Installing the SCS-120
Always disconnect power to the SCS-1R Receiver when installing or removing the SCS-120. Slide the SCS-120 Multibus Power Supply Card, the component side up, into the multibus rack upper position, which is the lower rack in the SCS-RACK.
Connect the SCS-208 Power Cable to J3 on the card front right side. Connect the other end of the power cable to the SCS-130 Transformer Card on the back of the modem rack. The power cable can be used in either direction.
Processor Monitor
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The SCS-120 monitors the Model SCS-150 processor through the multibus backplane. The green OK LED lights when the processor operates. If the processor stops operating, the red FAIL LED lights and the SCS-120 failure buzzer sounds.
Press the processor restart button to restart the system, silence the buzzer, and turn off the red LED. The restart button restarts the system.
Power Monitor LEDs
The SCS-120 monitors three different system voltages, +5, +12, -12 and the modem power supply. Four LEDs located to the right of the power alert silence switch display any voltage failures. A green OK LED lights when the voltages are working properly. The green PWR LED for the modem power supply is located on the SCS-110 Modem Power Supply Card. The red TRBL LED lights and the trouble alert tone on the SCS-120 sounds when there is a problem with a voltage level.
Press the SCS-120 power alert silence switch to silence the alert tone. The red TRBL LED remains lit until the power problem is corrected. The modem power LED, the SCS-120 trouble alert tone, and the SCS-110 Modem Power Supply Card power alert LED all operate together.
Digital Monitoring Products | SCS-1R Installation Guide |
