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jr transmitter problem

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Old 01-26-2005, 06:34 PM
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beanutputter
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Default jr transmitter problem

I have a JR XF631 that is about 3 months old. It is in its first airplane and has been doing fine on its first few trips to the field. I was getting my things ready to go to the field the other day and found that I had left my transmitter on. It was completely dead. So I tried to put it on charge but the led on the charger would not come on, which I took to mean it was not taking a charge. After playing with it for a few days I got a new battery pack for it and charged it with another radio setup. After the charge I put the pack in the transmitter and it is still not working. The radio will not even come on. Someone please tell me what I have done to my radio. Please help
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Old 01-26-2005, 08:05 PM
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mr.rc-cam
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Default RE: jr transmitter problem

Although I cannot imagine how, but the Tx's fuse has blown. It is a 3A 5x20mm glass fuse. Radio Shack should have them.

The pack that you left on overnight can probably be salvaged. Just slow charge it (60mA rate) for about 20 hours. Then go from there.
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Old 01-26-2005, 08:12 PM
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Default RE: jr transmitter problem

i was thinking maybe a fuse but, i also could not see how. do you think my jr warranty will be affected if i open it up
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Old 01-26-2005, 08:27 PM
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Default RE: jr transmitter problem

went ahead and opened it up, you were right the fuse was blown. looked good but failed the continuity test.
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Old 01-28-2005, 10:26 PM
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Default RE: jr transmitter problem

I was wondering does this happen regularly for others? If it is caused by the charger well, at best it is an annoyance, however if it happens during nomal operation, well I think you can imagine what may happen.
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Old 01-29-2005, 05:33 AM
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Default RE: jr transmitter problem

As you said, you ran your battery way down by leaving it on. When you connected it to the charger, the voltage/potential was very different from that of the battery's. This caused a surge, which blew the fuse.

Fuses don't blow while your flying, radios only draw 150-200 mA while operating, not 3 amps. Nothing to worry about.

The fuse needs to be a 3amp, fast blow fuse.

Good luck.
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