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Old 2013.02.23, 11:06 PM   #1
rdlkgliders
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Transponder Help

I have a new mr 02ex and a giro z transponder from pn. The car is on its 3rd transponder, suddenly while racing it will just quit registering. When I test it on another car the transponder does not work. This has happened 3 times now.
Any Help?
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Old 2013.02.24, 12:14 AM   #2
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Make sure the IR LED is not hitting the body. If it is, it can break the LED internally or crack the solder joints/PCB pads.
Inspect the solder joints closely. They may just need to be touched up if they are cracked.
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Old 2013.02.24, 01:38 PM   #3
rdlkgliders
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thanks for the response. I always test without body first
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Old 2013.02.24, 06:53 PM   #4
ChiMiniRc
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Quote:
Originally Posted by rdlkgliders View Post
thanks for the response. I always test without body first
It's the putting on the body that might be the issue. If the LED on the top is crushed down it can break. That may explain why moving it into another car has prevented it from working.
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Old 2013.02.24, 09:19 PM   #5
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I didn't mean the body was blocking the signal.
If the body or window physically touches the IR LED, it can damage it. Then it won't work without the body or in another car as you have stated.
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Old 2013.02.25, 10:07 PM   #6
rdlkgliders
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After taking a closer look at where the transponder mounts I think there is a good chance that the body did damage the laser.
Can I get a new laser if so what is the right one and does anyone repair them?
Thanks
Don
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Old 2013.02.25, 11:15 PM   #7
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TRP has a listing for them, but no stock and no actual component part number.
I was doing some parts orders today and I added a few pieces of what looked closest. I'll let you know in a few days when they arrive how close they are and we'll go from there.

Are you in the USA?
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Old 2013.03.01, 10:28 PM   #8
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Thanks Keep Me Posted
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Old 2013.03.09, 06:10 PM   #9
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Sorry about the delay.

This is the replacement LED:
http://www.mouser.com/ProductDetail/Everlight/IR91-21C-TR7

It is physically identical and the 940nm output is typical for the type of receiver they are using.

I replaced one and bench tested it, seems to work fine.
It's an easy fix, even with modest soldering skills.
Just be sure to orient it properly, it won't work backwards.

-Craig
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Old 2013.03.31, 01:29 PM   #10
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Thanks Craig,
I will order a few and fix the broken ones at our track.
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Old 2013.11.27, 05:24 PM   #11
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Have you had any success in repairing your transponders?
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Old 2013.11.28, 05:11 PM   #12
Mike Keely
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I have had good luck soldering the original LED back onto the transponder.
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