NCM-1550-EM30 (1550nm externally modulated optical transmitter) operating manual
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6.2
Troubleshooting
Should a problem occur, see if the symptoms are listed in Table 6-1.
Table
6-1: Troubleshooting Solutions
Indicator
status
Alarm menu content
Fault
phenomenon
Solution
Power
indicator is
yellow
Power Invalid LEFT (RIGHT)
The left (right)
power is break
down or the power
cord is not
plugged in
Plug in the left (right) power
cord. If that does not correct
the problem, contact Customer
Service. Replace the power
supply.
Power
indicator is
flash
yellow
-5V
Status
HIGH (LOW)
+5V
Status
HIGH (LOW)
+12V Status
HIGH (LOW)
-12V Status
HIGH (LOW)
+24V Status
HIGH (LOW)
Power alarm
menu shows one
of the contents
The laser is off
Contact Customer Service.
RF
indicator is
flash red
RF IN Status LOW (HIGH)
RF input is low
(high)
Verify the optical transmitter is
operating within the proper
input level threshold range
(78-96dBµV).
If that does not solve the
problem, contact Customer
Service.
CSO Initialization failed
CSO nonlinearity
indexes are poor
Disconnect the RF connection,
wait 10 seconds before
reconnecting the RF signal.
Laser
indicator is
flash red
Laser Bias
HIGH
The laser is off
Contact Customer Service.
Laser TEC
HIGH
The laser is off
Verify that the unit is operating
within the proper temperature
range (-5
～
+45
℃
).
Verify that nothing is
obstructing airflow through the
openings in the front and back
of the unit.
Recall factory settings by
pressing the key on the front
panel (see Section 3).
If that does not correct the
problem, contact Customer
Service.
