Technical data

Chapter 8: Troubleshooting

8.2.8 Procedure H

If the green PWR LED is “ON,” the yellow SYSTEM TROUBLE LED is “ON,” and D96, STB

SHORT LED is “ON,” a short condition exists on the STB OUT NAC output circuit. A STB

SHORT trouble condition might be caused by:

• Shorted appliance on STB OUT (TB12).

• Faulty wiring between STB OUT and strobe notification appliance circuit is causing a

short.

Perform the following: Check the wiring and strobe notification appliances for a short circuit

condition.

8.2.9 Procedure I

If the green PWR LED is “ON,” the yellow SYSTEM TROUBLE LED is “ON,” and D97 STB

OPEN LED is “ON,” an open condition exists on the STB OUT NAC output circuit. A STB

OPEN trouble condition might be caused by:

• Missing UL Listed 10K OHM, ½ W EOLR on the STB OUT circuit (TB12).

• Faulty wiring causing an open on the Strobe Notification Appliance Circuit.

Perform the following:

1. Check for proper EOLR.

2. Check the strobe notification appliance circuit wiring for an open condition.

SP40S Multi-Function Facility Communication System Manual, Revision D