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TC1540D User's Manual
Rev. 1.2
The TC1540 is designed with easy troubleshooting in mind. The LED indicators and DIP switches on the
top cover will support various diagnostic functions. The first step in troubleshooting is to determine whether
the problem is optical or electrical in nature. Figure 12 describes the steps required to isolate the problem.
The tests related to each block are explained in Chapter 4 - Bench Tests.
Figure 13. Troubleshooting Flowchart
Is the unit's
Power LED Lit ?
Conduct a
Remote
Loopback Test
Conduct a
Remote
Loopback
Test from
Opposite
Direction
Yes
Does the "TD"
LED Light when
Transmitting?
Check Pin
Assignments
Check Term-
ination Resistor,
DIP Switches &
Signal Polarity
Conduct a Local
Loopback Test
Check Optic Cable
Type, Connectors,
and Verify Optic
Connections
Check Power
Source, Polarity &
Power Connection
Measure Optical
Launch Power
(-13dBm to -22dBm)
Conduct an Optical
Loopback Test
Measure Optical
Receive Power
(-13dBm to -37dBm)
Conduct a Signal
Generator Test
Check Signal
Polarity and
DIP Switches
No
No
Yes
Pass
Fail
Contact
Factory for
Repair or
Replacement
of Unit
Fail
Fail
Pass
Pass
