Instruction manual

7-3
Table 7-1
Trouble LED Procedure Cross Reference
D13
TBL LED
(YELLOW)
LED
TROUBLE
DESCRIPTION
TROUBLE
SHOOTING
PROCEDURE
“OFF” D11 AC LED “OFF” No AC Power to the Motherboard. Procedure A
No Audio and/no strobe output Procedure B
D10 BAT Battery voltage is below 18.5 VDC or battery is missing. Procedure C
D9 AC AC input voltage missing for more than 6 hours. Procedure D
D22 DV Digital Voice Section output voltage is too low or missing. Procedure E
D35 MIC Push-to-talk Microphone inoperable or missing. Procedure F
D36 AMP Amplifier failure or J4 jumpers incorrect. Procedure G
D37 STB SHORT Strobe Notification Appliance Circuit is shorted. Procedure H
D39 STB OPEN Strobe Notification Appliance Circuit is open Procedure I
D49 AUX IN Auxiliary input is open or remote MIC is in TROUBLE Procedure J
D54 AUDIO SHORT Audio Notification Appliance Circuit is Shorted Procedure K
D58 AUDIO OPEN Audio Notification Appliance Circuit is open Procedure L
“ON”
D60 GF Ground Fault Trouble Procedure M
BEFORE PERFORMING ANY OF THE FOLLOWING TROUBLESHOOTING PROCEDURES, THE
PRELIMINARY TROUBLESHOOTING INFORMATION AT THE BEGINNING OF THIS
“TROUBLESHOOTING” SECTION MUST BE READ, UNDERSTOOD, AND FOLLOWED.
Procedure A
If the green AC LED is “OFF”, and all other LEDs are “OFF”, a power loss condition has occurred.
A power loss condition may be caused by:
1. Loss of AC input voltage and battery back-up voltage.
2. Faulty internal wiring between the rectifier module and the ± IN (TB1) on the motherboard
and batteries missing.
3. Faulty Motherboard.
4. Faulty Transformer Assembly
Perform the following:
1. Check for 24VDC at TB1 on the Motherboard. If voltage is not present, replace the
Transformer Assembly (SP40XFMR). Check for battery installation.
2. If the 24VDC is present on TB1, replace the motherboard.
NOTE: Mark all wires before removing components. When the trouble is repaired, and before
testing, replace all wires to the proper locations and replace all covers.