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TAS2555: Laser input not seen by PPC3 when determining Bl of speaker

Part Number: TAS2555

I am using PPC3 with LB2 connected to TAS2555YZEVM. I perform the hardware checks and do a speaker fit test. No problems. However when I run the speaker excursion test to determine Bl, I get a fit error. The displacement curve is not seen or displayed. 

I have checked the excursion signal at the BNC connector with a scope and it looks fine. The EVM is not seeing signal.