Mine has the same problem, but it seems to be caused mainly by excessive heat, mainly from being in the window of a hot car in the summer sun. Mine rarely does it in the winter. I suspect the CAL part has to do with a calibration fault when it self-tests itself when it's first turned on.
What I usually do is to pull the detector out of the mount and hold it in front of the air conditioning vent so that the cool air can go in though the holes in the case. It may take several minutes of cooling in this manner before it can power up without the LO CAL 1 message.
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This means that the primary local oscillator couldn't be calibrated during the RD's self-calibration procedure. You could get your RD repaird by Bel/Escort, but with these older models, your best bet would be to take advantage of Bel/Escort's trade-in offer to get a current model which provides significantly better performance -- particularly with regards to Ka band radar.
Bel/Escort now uses a special and proprietary "high temp" speaker which resolves issues of speakers blowing due to high ambient temperatures or heat which builds up within the speaker when it is alerting for extended periods of time. If your RX65 is in warranty and you can make a photocopy of your sales receipt, then great! All you have to pay is shipping to Bel. Bell will replace the speaker with the new version, flash your RX65 with whatever the latest firmware is, and calibrate and test your RX65 too. So, all of this is peachy if your RX65 is under warranty.
If your RX65 is out-of-warranty or if it doesn't have a serial number or was bought from a non-authorized dealer, then the service charge as I recall is $80. Thats not bad since your RD will come back working like brand new.
A note about the speakers: They are made by PUI, but the speakers are proprietary to Bel/Escort. Thus you can not buy them from any source -- not even direct from PUI.
On mine you can barely hear it on the 9 setting. I put in a different speaker but no difference. I did look up the number on the IC chip near where the speaker connects (34119) and it came back to a 500 mW audio amplifier, so you could probably replace that and fix it. I think it's what you call a flat-pack style chip. Not as bad as surface mount but will still require a tiny soldering iron. I think the actual part number ended up being MC34119D and should cost a dollar or less.
they are two on back thke the bottem then the top will come off the problem is there are two hinges in the front part on each side u have to compress each side with a very tiny flat head screwdriver. note be very careful this unit is not make to take apart easy but it can be done i have the same problem i am going to radio shack to see if the have the part for the voltage but first i am going to re sader the contection first. hope this works mark
I am looking for a fix as well mine says" ?LO1 CAL "
Help!!!!! now mine wont go back to working mode at all
I will restart and get the same error message and of cource nothing in the instructions I say " W T F !! "