Instruction manual

7-13
Replace MDV-OCM. If TROUBLE LED remains “STEADY ON” then there is circuitry failure on
the MDX-2. Replace.
There are no field correctable failed circuitry problems. Digital voice modules with failed circuitry
shall be replaced immediately, following Section 7-1 - SAFEPATH
®
Module Replacement
Procedure on Page 7-14.
Procedure N
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 flashes a “2-blink” pattern, a message memory
EPROM error has occurred on the MDX-2 module. A message memory EPROM error may be
caused by:
1. Pre-programmed message memory EPROM's not installed into Series MDX-2 in proper order.
2. No messages programmed into message memory EPROM's.
3. Missing or improperly installed message memory EPROM's.
4. One or more of the messages were not programmed completely.
5. Failed circuitry on the MDX-2.
6. The optional Output Channel Module (MDV-OCM) is installed when not required.
If the error was due to one of the first four causes, the trouble will clear automatically when the
cause is corrected. The first four causes should only occur when power is first turned on to the
Series MDX-2.
When a message memory error is indicated, perform the following:
1. Verify that the preprogrammed message memory EPROM's were installed in the correct
sockets on the Series MDX-2. See Figure 9-4 on Page 9-8 for proper chip location. An
EPROM must always be installed in socket S14. If between one and two minutes of message
memory is required, the first EPROM must be installed into socket S14 and the second
EPROM into socket S12.
2. Verify, at least one message is programmed into the message memory EPROM's.
3. Verify that all message memory EPROM's are inserted into their sockets properly.
4. Verify that there are no partially programmed messages on the message memory EPROM's.
This can only be done using commands on the serial port, which is located on the optional
Ground Fault Detection/Computer Interface Module.
5. Remove the optional Output Channel Module if the message files require only channel one.
If, after the above procedure is completed, the trouble condition persists, the trouble condition is
caused by failed circuitry on the Series MDX-2. There are no field correctable failed circuitry
problems on the Series MDX-2. Series MDX-2's with failed circuitry shall be replaced
immediately, following Section 7-1 - SAFEPATH
®
Module Replacement Procedure on Page 7-14.
Procedure O
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 flashes a “4-blink” pattern, an audio channel
error has occurred. An audio channel error may be caused by:
1. Too low an audio level while playing a message.
2. Pause in message while playing a message that lasts longer than 3 seconds.