JR7202 Problem??? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-31-2009, 07:20 AM   #1
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JR7202 Problem???

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I inadvertantly left my transmitter on and let the battery almost drain. After charging it up I noticed my model 1 was missing and when I tried to go from model 2 down to model 1 the radio froze. Yesterday my friend who has a 7202 had the same problem. In addition when he went to model 20 the radio again froze. I tried the same with mine with the same result. Has anyone else experienced this problem? Is there a remedy or fix?

Your help is appreciated!


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Old 07-31-2009, 09:54 AM   #2
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Re: JR7202 Problem???

How old is the radio ?
I suspect the internal lithium cell is dead it provides power to the memory if the main battery dies or is removed from the radio. If this is the case you will have lost everything in memory ...all programs models etc.

These cells need to be replaced every +/- 5 years, I know on the older JR radios replacing this cell is also something you can't just do yourself, it has to go back to Horizon and they have to run a sequence of program resets after the new cell is put in and they never used to share this reset sequenece with consumers... the 7202 may be different, not sure give them a call.

If this is the case sorry man - Good luck.
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Old 07-31-2009, 09:57 AM   #3
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Re: JR7202 Problem???

Never had that on any of my JR's. It may not hurt to check the memory backup battery. Inside the radio there will be a lithium backup battery that maintains the programming when the main battery is not installed or running low. If the backup is low it could cause erratic performance.
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Old 08-01-2009, 12:10 AM   #4
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Re: JR7202 Problem???

this sounds almost like what i had but mine would not allow me to model 5. anyways did some digging and the result is on mine i had a thing called MODEL LOCK. i phoned JR and i explained it to them. They told me that it had to be sent down to them to get fixed. did this and all has been good so far.
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Old 08-01-2009, 04:46 AM   #5
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Re: JR7202 Problem???

Hi Konrad

I was informed last night that it is youre lithium battery that is weak . I have a 7202 and have never had any problems with it . I have left my transmitter on at least once , and have never had the problems that you are haveing .

Interrested to know how this works out for you .

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Old 08-24-2009, 11:29 PM   #6
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Re: JR7202 Problem???

Thanks to all for the input! I have had no other issues other than the Model 1 and 20 problem.
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Old 08-26-2010, 07:28 AM   #7
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Re: JR7202 Problem???

The older radios had an extra battery to maintain settings memory but since the invent. of flash memory no lithium battery needed.
This is a common problem with the 7202 and will cost $$ to have it fixed(reset and re-calibrated) at the factory. 3 out of 3 at our club have the problem and we just avoid trying to use those model memorys, but one of the radios can only use 2 of the 20 models.
I found how to get to the special settings screens(power up and select model reset screen, then toggle the aileron dual rate up and down 5 times while alternately pressing increase and decrease till it jumps into the screen), but when I selected the clear option I couldn't get the memory to clear. It flashes a message to power off and wait for the LCD to clear, but when I power back up the radio is the same. I realize I will have to recalibrate the joy sticks and bat meter but I am willing to try it, as the 72Mhz radio is not really worth the money(50$+) to send back. What guarantee would I have anyway that it wouldn't screw up again anyway. If anyone has figured out how to clear out the memory(and get the radio working properly) please let me know. I am sure the other 2 guys will also appreciate the info. Sending it back takes over a month with the cross border customs hassles these days and its still flying season. Since the DX7 shares the same s/w I wonder if any of these will experience the problem. JR has kept a low profile with this one I'm sure to avoid backlash but I have googled and found a lot of others reporting the prob.
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Old 08-29-2010, 09:08 AM   #8
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Re: JR7202 Problem???

I have 2 7202's and havent had this problem (yet)

I too suspect the backup-battery has died.

I have had problems with other older JR radios when their internal backup batteries died. A real PITA. I replaced them all myself as the need arose.
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