Nortel North American DMS-100 Instruction Manual page 573

1-552 Trouble locating and clearing procedures (continued)
TOPS MPX Power-on self-test troubleshooting
Summary of TOPS MPX power-on self-test troubleshooting
From TOPS MPX
power-on self-test
procedure.
See Error
Codes and
Messages.
Follow
suggested
action.
297-8021-544 Standard 14.02 May 2001
Y
Screen blank?
N
Y
Error code
displays?
(continued)
N
Beeps?
Y
Power on and Y
connected, display
cable connected?
N
Connect power cord,
turn power switch to
on, connect display
cable.
Retry TOPS MPX
power-on self
test procedure.
Remove and
replace TOPS
MPX position.
Y
Is screen
still blank?
N