User`s guide

3 - HARDWARE DESCRIPTION

SCS-1 Install/User's Guide

2841 E. Industrial Drive Springfield, MO 65802-6310 800-641-4282

MODEL SCS-120 MULTIBUS POWER SUPPLY CARD

3.6 Description

The SCS-120 provides power to the processor card through the multibus backplane. The SCS-120 also monitors

the condition of the processor card, the voltage output of the modem power supply card, and its own internal

voltages.

3.6A Installation

Always disconnect power to the receiver when installing or removing the SCS-120. Install the board with the

component side up in the upper position of the multibus rack. Connect the SCS-208 Power Cable to J3 on the

front right side of the card. Connect the other end of the power cable to the transformer card on the back of the

modem rack. The power cable can be used in either direction.

3.6B Processor Monitor

The SCS-120 monitors the processor of the Model SCS-1062 through the multibus backplane. The green OK

LED lights when the processor is operating. If the processor stops operating, the red FAIL LED lights and the

failure buzzer on the SCS-120 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 and resets the time of day. All other

system configuration information is not changed.

3.6C 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 trouble silence switch display any voltage failure. A green OK LED lights when

the voltages are in good condition. The green PWR LED for the modem power supply is located on the modem

power supply card. The red TRBL LED lights and the trouble alert on the SCS-120 sounds when there is a

problem with a voltage level.

Press the power trouble silence switch to silence the alert. The red TRBL LED remains lit until the power

problem is corrected. The modem power LED, the trouble alert on the SCS-120, and the power trouble LED on

the modem power supply operate together.

POWER

ALERT

SILENCE

TRBL

MODEM

POWER

TRBL

SCS-1062 +5 +12 -12

PROCESSOR

RESTART

FAIL