Technical data

Chapter 8: Troubleshooting
8.2.5 Procedure E
If the green PWR LED is “ON,” the yellow SYSTEM TROUBLE LED is “ON,” D3 DV LED is
“ON,” the Digital Voice messages are missing or the DV output voltage is too low. A DV Low
Output Voltage condition might be caused by:
• Missing or incorrectly installed memory chip.
• Digital Voice volume control (R73) set too low.
• No messages recorded on memory chip.
Perform the following:
1. Check memory chip (U31) to ensure it is installed properly.
2. Verify that messages are recorded on the chip by activating them using the display
buttons.
3. Check Digital Voice volume control (R73) for proper volume level.
4. If messages were field recorded, make sure the message(s) were recorded properly and at
the proper volume.
5. Replace the motherboard.
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.
• Overcurrent 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.
SP40S Multi-Function Facility Communication System Manual, Revision D
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