Instruction manual

7-9
1. Digital Voice Module Inoperable.
Perform the following:
1. Replace Digital Voice Module (MDX-2)
When replacing digital Voice Module (MDX-2), properly remove the Voice Module Chips
(See Figure 9-4 for locations) and the optional Output Channel Module (MDV-OCM) if
installed. Install these items in the new MDX-2 prior to the MDX-2 installation in the panel.
Procedure D
On the DCDC Module, the green NORMAL LED is “OFF”, the yellow TROUBLE LED is “ON”,
D12 “OFF”, D11 “OFF”, D10 “ON”, and on the SAA/SALL module the STR/STROBE LED is “ON”,
a visual notification output wiring trouble condition has occurred. A visual notification output
wiring trouble condition might be caused by:
1. Missing end-of-line resistor on the visual notification output.
2. The Visual Notification Output field wiring is open or shorted.
3. A fuse on the SAA/SALL module is blown.
4. A faulty SAA/SALL module.
5. A faulty Motherboard (DCMB) module.
Perform the following:
1. Check EOLR resistor and verify that it is a UL LISTED a 10K Ohm, 5% Tolerance, 1W
Resistor.
2. Check that the EOLR resistor is properly in place.
3. Verify that the Visual Notification Output field wiring is intact.
4. Verify that all fuses on the SAA/SALL module are good.
5. If trouble does not clear, remove strobe appliance circuit from Motherboard and place a 10K
Ohm 1/4W minimum resistor on strobe output. If STR/STROBE LED turns “OFF”, the trouble
is in the Strobe NAC Circuit. If trouble does not clear, replace the SAA/SALL module.
6. Replace the Motherboard (DCMB).
Procedure E
On the DCDC Module, the green NORMAL LED is “OFF”, the yellow TROUBLE LED is “ON”,
D12 “OFF”, D11 “OFF”, D10 “ON”, and on the SAA/SALL module, the SPK/AUDIO LED is “ON”,
an audio output wiring trouble condition has occurred. An audio output wiring trouble condition
might be caused by:
1. Missing EOLR resistor on the audio output.
2. The audio output field wiring is open or shorted.
3. A faulty SAA/SALL module.
4. A faulty Motherboard (DCMB).
Perform the following:
1. Check EOLR resistor and verify that it is a UL LISTED a 10K Ohm, 5% Tolerance, 1W
Resistor.
2. Verify that the EOLR resistor is properly in place.
3. Verify that the audio output field wiring is intact.
4. If trouble does not clear, remove audio appliance circuit from Motherboard and place a 10K
Ohm 1/4W minimum resistor on audio output. If SPK/AUDIO
LED turns “OFF”, the trouble is
in the Audio NAC Circuit. If trouble does not clear, replace the SAA/SALL module.