Lantronix 4092A IRIG-B manual Troubleshooting the 4092A, Troubleshooting Input Problems

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	1. Check that the input cable is
	not receiving a valid signal.	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.

4092A Operations and Maintenance Manual 17