JR XP8103 Problem!!! - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-27-2010, 12:08 PM   #1
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JR XP8103 Problem!!!

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I am having an issue with my transmitter and was wondering if anyone on here would be able to give me some ideas.
I didn't fly my Heli at all last summer and I went to turn my radio on and it wont turn on. I have a brand new battery installed and I also checked the fuse thats inside to make sure its good and I also checked the voltage of the internal battery and that seems to be ok as well. and it still wont turn on.

If anyone has any Ideas on what could be the problem it would be appreciated

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Old 03-27-2010, 04:07 PM   #2
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Re: JR XP8103 Problem!!!

35 people have viewed this thread and no ideas!

I do have a 8103, but never had a problem with it as it is being used on my SIM. Given to me free by Andy at Jet Hobbies.

You must have a power problem; either with you new battery or with the circuit connecting it to the rest of the unit. Difficult for me to say what to test first.

Good luck,
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Old 03-27-2010, 05:40 PM   #3
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Re: JR XP8103 Problem!!!

Many of the transmitter batteries, the plug is wired backwards to JR. Check to make sure the power of the battery is getting to the plug. I made a plug out of two bent "T" pins and some scrap spruce. I coloured one end black with a marker. That is the negative lead. Spray the switch with contact cleaner and move it back and forth a couple dozen of times. You can use the home made plug to check and charge the battery out of the transmitter.

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Old 03-27-2010, 06:14 PM   #4
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Re: JR XP8103 Problem!!!

You've obviously got a bit of working knowledge with electronics to be able to check the internal battery...

With the TX battery plugged in (properly), trace the voltage along the circuit until you lose it. You may have a diode in line with the TX battery (to prevent reverse bias charging), that may have failed open. This would be my first guess.

Hope this helps,
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Old 03-30-2010, 12:29 PM   #5
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Re: JR XP8103 Problem!!!

So is it fixed??
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Old 03-30-2010, 01:12 PM   #6
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Re: JR XP8103 Problem!!!

I had a JR x347 do this to me a few years ago. I have pretty good electronics skills, so I trouble shot it (I have 2 other x347's as well, no issues with them)

Battery, fuses, everything was A-ok

In the end, it was DEAD ON ARRIVAL. I figure the processor crapped out. I keep the radio for spare parts; the switches and whatnot are good for repairing other radios...
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Old 03-30-2010, 02:13 PM   #7
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Re: JR XP8103 Problem!!!


This is common with the 8103. Take the freqency module off and look down inside the transmitter freqency cavity, there is a fuse in there and some blow for no apparent reason. Take it out for a sample, it can be a little difficult, and you can pick one up at an electronic store. Pick up an extra and tape it inside the battery compartment as a spare.

I have heard that if you plug the charger in, or take it out, with the Tx on, it could cause it to blow.

Hope this is your problem. let us know how you make out.


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