Cooper Notification SP40S Series, Installation, Testing, Operation And Maintenance Manual

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Troubleshooting
SP40S Multi-Function Communications System 72
8.2.12 Procedure L
If the green PWR LED is “ON,” the yellow SYSTEM TROUBLE LED is “ON,” and D1
AUDIO 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 AUDIO OUT circuit (TB4).

Faulty wiring is causing an open on the speaker notification appliance circuit.
Perform the following:
1. Check for proper EOLR.
2. Check the speaker notification appliance circuit wiring for an open condition.
8.2.13 Procedure M
If the green PWR LED is “ON,” the yellow SYSTEM TROUBLE LED is “ON,” and D67
GF LED is “ON,” a ground fault condition exists on the output wiring. A GF trouble
condition might be caused by:

Appliance wiring touching conduit.

Improper Installation of an appliance(s).
Perform the following:
1. Disconnect appliances from the strobe (TB12) and speaker (TB4) connection on
the motherboard.
2. Troubleshoot the NAC circuits by checking for a resistance reading other than
infinity between the appliance leads and the conduit.
8.2.14 Procedure N
If the green PWR LED is "ON," the yellow SYSTEM TROUBLE LED is "ON," and D47
INT TRB is "ON," an Interface Trouble exists. An Interface trouble might be caused by:

The 30 pin ribbon cable being removed from the display or motherboard

The 30 pin ribbon cable being connected to the wrong header.

The 30 pin ribbon cable being damaged.
Perform the following:
1. Ensure that the ribbon cable is properly installed to the user interface and to the
motherboard at J6 (Display Interface).
2. Check to see if the ribbon cable has been damaged in any way. If the ribbon
cable is damaged, replace it.