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Topic:
MX-980 - Where is the RF transmitter?
This thread has 2 replies. Displaying all posts.
Post 1 made on Wednesday November 9, 2011 at 13:31
CZ Eddie
Long Time Member
Joined:
Posts:
March 2009
74
I dropped my MX-980 for the hundredth time this week. Last time it stopped transmitting RF after a fall, so I re-soldered a few suspect looking joints and that fixed it. Or just taking it apart & back together fixed it.

Anyways this time resoldering the suspect joints didn't help. It's still not transmitting RF and the only thing that changed was the new fall it took to the ground.

Any ideas which component is the RF transmitter so I can concentrate on that component? I assume it's the black looking cap thing at the front but I don't know.

[IMG][/IMG]

[IMG][/IMG]

Last edited by CZ Eddie on November 9, 2011 14:31.
OP | Post 2 made on Wednesday November 9, 2011 at 13:42
CZ Eddie
Long Time Member
Joined:
Posts:
March 2009
74
Hmm, I just did some googling and this is what a typical RF transmitter looks like.

This is NOT from the MX-980. It's just some internet pic.
[img][/img]

So I'm pretty sure that's it on top of the daughter board. Crap. And I suspected that area and already did everything I could think of by reseating it and re-soldering the large pole that goes from the daughter board to the motherboard. Dang. Not sure what else to do.

Anyone know where I can get a replacement daughter card? URC won't sell parts.







EDIT: I fixed it and will post pics in a little while.

Last edited by CZ Eddie on November 9, 2011 14:15.
OP | Post 3 made on Wednesday November 9, 2011 at 14:33
CZ Eddie
Long Time Member
Joined:
Posts:
March 2009
74
Okay, so I resoldered a second time and now it's working great! RF is back!

Each of the red circled locations are where I re-soldered. I resoldered on both sides of the board.
Ignore the red-square section, that's for a different thread.

Note that this solder joint on the right wasn't making contact with the trace, so I added more solder to bridge them better. I had checked this with an ohmeter and it found nothing. Now it does.
[IMG][/IMG]

[IMG][/IMG]

[IMG][/IMG]

[IMG][/IMG]


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