AT&T MERLIN LEGEND Installation & Maintenance Manual page 535

Maintenance and Troubleshooting
Table 5-2 Continued
Error Screen
Description
Code
840C
STUCK
RINGING
840D
INCORRECT
FIRMWARE
STATE
840E
TRK UPLINK
MESSAGE
ERROR
Possible Cause
Continuous ringing
from CO
AC power cross
Incorrect system
module firmware
state
Unrecognized
message from the
processor module to
the line/trunk and
station module
Solution
Swap positions of
similar line/trunk and
station modules. If
problem follows
module, replace
line/trunk and station
module. If problem
stays at that position,
test line/trunk.
Turn power off for at
least 1 second and then
back on. Repeat
system programming
procedure. If problem
persists, replace
Iine/trunk and station
module.
Turn power off for at
least 1 second and then
back on. Repeat
system programming
procedure. If problem
persists, replace
line/trunk and station
module.
Troubleshooting 5-57