
Originally Posted by
MEM-TEK
Probably the horn ridge to LO board microstrip solder bead contact. Belscort, like the rest of the electronics industry, has switched to a RoHS compliant (lead free) manufacturing process. I had a similar problem on my 9500i after I fully disassembled it in order to photograph its internals. The tiny lead free solder bead was just too soft. I removed it, used the smallest jewelers screwdriver which I had to apply a tiny 1/2 millimeter wide dab of solder paste, and then used my lowest watt soldering iron to create a new lead solder bead. Lead solder is harder than lead free solder. This solved my 9500i's problem of continuous and random falsing.
The above is also why I have been an advocate for months that Belscort should use ThreeBond 1401B adhesive to secure the screws which secure the horn to the main circuit board. That way vibration and temperature changes can not cause the screws to eventually become a bit loose. Whistler, by the way, uses ThreeBond on their horn-to-board screws to prevent similar issues. Maybe Belscort will read this post and eventually decide that ThreeBond is a good idea. Of note, I applied ThreeBond on my V995, STi, 9500i very soon after getting each RD, and have allowed all three radar detectors to more or less continuously cycle through temperature extremes of 5 to 100 degrees F. Not one darned problem so far for me. Note that if the detector(s) was very hot, then I let it cool off before powering it up in order to avoid any possibility of electronics damage due to overheating.
Well, thats my theory as to why your RD was falsing at colder temperatures as well as my thoughts as to what Belscort should be doing during the assembly process.
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