I took delivery of a FLEX-6400M this evening and am hearing a loud rattling sound when the radio is powered on. The rattling noise apparently is fan blades that are brushing up against something inside the chassis. I contacted the Help Desk after hours this evening but do not expect to hear from anyone until tomorrow morning. Meanwhile, I would appreciate any related thoughts. Thank you!
Years ago, my VU5K had a similar rattle on arrival. After I cracked it open, I found that whoever assembled it had simple wadded the power cord for the main cooling fan into a ball and shoved it behind a ribbon cable. It had vibrated lose and was being hit by the fan blades. Fortunately it did not get tangled. Fixing it was trivial by adding a cable tie. Been fine ever since.