Instruction manual

7-12
3. Replace Motherboard.
Procedure L
On the DCDC Module, the green NORMAL LED is “OFF”, the yellow TROUBLE LED is “ON”,
D12 “ON”, D11 “OFF”, D10 “OFF”, and the MDX-2 SYSTEM NORMAL LED is “OFF”, SYSTEM
TROUBLE LED is “ON”, and the TROUBLE LED is “OFF”, the digital voice module may be
completely inoperative. This condition is caused by:
1. Too low input voltage on the digital voice module.
2. Missing or improperly installed program memory EPROM.
3. Broken TROUBLE LED (digital voice module is operative if this is the cause).
4. Failed circuitry on the digital voice module.
Perform the following:
1. Verify that the input voltage at TB1 on DCMB is 24VDC ± 5VDC.
2. Verify that the program memory EPROM is present and inserted into S15 properly of the
MDX-2 Module.
3. Attempt to play a message file. If the file plays then the digital voice module trouble indicator
LED is broken. Replace MDX-2 Module.
4. Replace MDX-2 Module.
If, after the above procedure is completed, the trouble condition persists, the trouble condition is
caused by failed circuitry on the digital voice module. There are no field correctable failed
circuitry problems on the digital voice module. Digital voice modules with failed circuitry shall be
replaced immediately, following Section 7-1 - SAFEPATH
®
Module Replacement Procedure on
Page 7-14.
Procedure M
On the DCDC Module, the green NORMAL LED is “OFF”, the yellow TROUBLE LED is “ON”,
D12 “ON”, D11 “OFF”, D10 “OFF”, and the MDX-2 SYSTEM NORMAL LED is “OFF”, SYSTEM
TROUBLE LED is “ON”, and the TROUBLE LED is “STEADY ON”, the digital voice module is
partially or completely inoperative. The digital voice module can be rendered inoperative by:
1. Too low input voltage on the digital voice module.
2. Failed audio channel on the digital voice module.
3. Failed Message Kit (SMK or PMK)
4. Other failed circuitry on the Series MDX-2 or Output Channel Module (MDV-OCM).
5. An improperly installed Output Channel Module (MDV-OCM).
If the error was either due to the first or third cause, the digital voice module will not play
messages. If the error was due to the second cause, the digital voice module might play
messages.
When the digital voice module is rendered inoperative, perform the following:
1. Verify that the input voltage is 24 +/- 5 VDC.
2. Attempt to play messages on all installed audio channels.
3. Remove Message Kit (SMK or PMK). If the TROUBLE LED on the MDX-2 goes to a “2 Blink”
pattern, then the Message Kit is in error. Replace Message Kit.
4. If Output Channel Module (MDV-OCM) is not installed then there is circuit failure on the MDX-
2.
5. If installed, check pin alignment on the Output Channel Module. If trouble persists, remove the
MDV-OCM. If the TROUBLE LED goes to a “4 Blink” pattern, then the MDV-OCM has failed,