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

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Troubleshooting
SP40S Multi-Function Communications System 70
8.2.6 Procedure F
If the green PWR LED is “ON,” the yellow SYSTEM TROUBLE LED is “ON,”D4 MIC
LED is “ON” steadily, the push-to-talk microphone is missing, improperly plugged in, or
defective.
Perform the following:
1. Install the microphone.
2. Remove the microphone plug and plug it back in.
3. Replace the microphone.
4. Replace the motherboard.
8.2.7 Procedure G
An Amplifier Trouble is present, if the green PWR LED is “ON,” the yellow SYSTEM
TROUBLE LED is “ON,” and D5 AMP LED is “ON” steady. An Amplifier Trouble
condition may be caused by:

Short on the audio output.

Overloaded audio output.

Over current circuit protection mode from improper power up.
Perform the following:
1. Check the TB4, Audio Out terminals and speaker wiring for shorts.
2. Check to ensure the speakers are tapped correctly.
3. Check to ensure the Output Select jumper (J1) is installed at the proper voltage
level.
4. Reset the SP40S by removing AC and Battery power. Wait 30 seconds and
reapply power. AC first and then batteries.
5. Replace the motherboard.
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.