Topic ID: id_12374185
Version: 1.3
Date: Jul 5, 2019 10:03:32 PM

Exciter (with Electric Clock) Troubleshooting

The front panel LED indicators identify the state of the components and connections for the exciter with electric clock. Some indicators are associated with a 1-wire status as shown in Table 1.

In addition to the 1-wire network diagnostics, the functional unblanking diagnostic in the service browser can be used to troubleshoot suspected loss of unblank signals in the exciter. See Functional Unblanking Diagnostic for instructions to run this diagnostic.

Table 1 Exciter Front Panel LEDs and 1-Wire Status
Indicator	Status	Description	1-Wire Status (NB Exc, NB Exc I/O Board, or Clk Ref Board)	Suggested Service Actions
CLOCK OK	Green	The 80 MHz system clock signal is being generated on the clock reference board and received by the exciter board.	Exciter 80MHz Clock OK Exciter Clock Ref 80MHz Detected	None
CLOCK OK	Off	The clock is not being generated on the clock ref board or the exciter board is not receiving the clock signal properly.	Exciter 80MHz Clock Not OK Exciter Clock Ref 80MHz Not Detected	Confirm/reseat all clock connections from the exciter module. If ICE and/or the Receive chain also report a missing clock signal, and the connections are OK, the clock source on the clock ref board has failied. Replace the exciter module. If only the exciter board is reporting a missing clock signal, then an internal harness has failed. Replace the exciter module.
LO OK	Green	The LO signal is present and operational. This signal is generated in the clock reference board inside the exciter module and detected at the exciter board.	Exciter LO OK	None
LO OK	Off	The LO signal is not available to the exciter board inside the exciter module or the LO source on the clock reference board is not functional.	Exciter LO Not OK	Confirm/reseat all LO connections from the exciter to the receive chain. If the Receive chain also reports a missing LO signal, and the connections are OK, the LO source on the clock ref board has failied. Replace the exciter module. If only the exciter board is reporting a missing LO signal, then an internal harness has failed. Replace the exciter module.
LINK UP	Green	The incoming DVLink to the exciter is connected and operational.	Exciter Fiber Optic Signal Presence Exciter FPGA Up Exciter Fiber Optic Link Up	None
LINK UP	Off	the DVLink is not connected to the exciter, the sequencer is not transmitting properly or the exciter is not responding properly.	Exciter Fiber Optic Signal Loss Exciter FPGA Down Exciter Fiber Optic Link Down	Check the DV link connection to the exciter module TPS reset. Run the DVMR Link Status diagnostics to determine if the issue is on the sequencer side or the exciter side. Try moving the DV link connection for the exciter to a different sequencer port on ICE/CAM.
SFP FAULT	Red	The SFP module is missing, not fully seated, or is not transmitting data from the exciter properly.	Exciter SFP Tx Not OK	Confirm the SFP module is installed properly at the exciter module. Swap the SFP module from the exciter with an unused module from the ICE (if available). Replace the SFP module.
SFP FAULT	Off	The SFP is working properly.	Exciter SFP Tx OK	None
CLK DC POWER GOOD	Green	The clock reference board is powered up.	Exciter Clk Ref Power Status OK	None
CLK DC POWER GOOD	Off	The clock reference board is not receiving DC power from the exciter board.	Exciter Clk Ref Power Status Not OK	Confirm connection to exciter module J1 is seated properly. Confirm Exciter DCPS or eSRPS is powered up properly and that voltages are present on the connection into the exciter. If incoming power is OK, an internal circuit or harness has failed. Replace the exciter module.
EXCITER POWER GOOD (small LED next to J1 on front panel, not labeled)	Green	Exciter board incoming power and all regulators are working properly.	Exciter Digital Power OK Exciter Power OK	None
	Off	One or more voltage rails on the exciter board is low or missing.	Exciter Digital Power Not OK Exciter Power Not OK	Confirm connection to exciter module J1 is seated properly. Confirm Exciter DCPS or eSRPS is powered up properly and that voltages are present on the connection into the exciter. If incoming power is OK, an internal circuit or harness has failed. Replace the exciter module.