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4092A Operations and Maintenance Manual 17
4: Troubleshooting the 4092A
Perform all of the following procedures before returning the unit for service. If the unit still
appears to have a problem, call Timing Solutions Corporation and request technical support. Have
the serial number of your unit ready to give to a technical representative.
4.1 Troubleshooting Input Problems
As long as the 4092A is in autoswitch mode and has two valid input signals connected, the unit
will automatically switch to the other input channel if it stops receiving a valid signal on the active
channel.
If the unit loses the active input signal, the LED for the that input turns red until you correct the
problem. To correct the problem, you must ensure that the channel is receiving a valid signal and
reset to the autoswitch mode.
Table 3 shows the INPUT LED states, their definitions, and actions required. Table 4 shows the
INPUT SELECT LED states, their definitions, and actions required.
Table 3: INPUT LED troubleshooting
Input LED status What it means What do to
One or both LEDs solid red The red LED shows that the channel is
not receiving a valid signal.
1. Check that the input cable is
connected.
2. Check that the input signal meets the
following specifications for
modulated signals:
• Signal type: IRIG-B
• Input level: > 2.8 V Peak to
Peak into 50 Ω.
3. Check that the input signal meets the
following specifications for
unmodulated signals:
• Signal Frequency: 1- 200 kHz
• Input level: > 1.5V Peak to Peak
into 50 Ω.
4. Check that the impedance and signal
type jumpers are set correctly. See
“4.4 Configuring for Input Signal
and Impedance” on page 19.
5. If the LED remains red, contact
TSC.
• See “5.1 Warranty Information”
on page 23.