http://www.dslreports.com/forum/Yaesu-FT2800M-Broken-via-24-Volts-22209380 en Sat, 11 Feb 2012 12:35:04 EDT Sat, 11 Feb 2012 12:35:04 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22223122 said by utahluge:

Ya. Sorry. I tested with my brother about 25 yards away and I could TX & RX no problem. Note: I was transmitting 65 Watts and forgot to make sure the low-end (5 Watts) was working well too. I should be able to test again later this evening for the low-end. Thanks.
WTG. :)

Saved yourself a bit of scratch either way.

Good on ya. :)
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A filthy mind is a terrible thing to waste.
]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22223122 Sun, 12 Apr 2009 01:26:31 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22223117 http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22223117 Sun, 12 Apr 2009 01:25:07 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222819 said by utahluge:

Ok. I have cut D301 and when I applied power, the radio does turn on. :) So, now I guess I just need a replacement.

Thank you very very much for your help! I hope one day I will be able to help you too!
Good deal. I'm glad to know it works! Call me a bit selfish, but I love proving to people at work (Russ...) that I do halfway know what I'm doing, even if I can't see it.

I've told him that's what learning theory is all about. If you know mentally how it's supposed to work, you can figure it out without seeing it.
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]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222819 Sat, 11 Apr 2009 23:12:26 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222603

P6KE10A.pdf

]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222603 Sat, 11 Apr 2009 22:16:31 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222577 www.dxclube.com.br/files/yaesu_f···nual.pdf

Page 25: D301, Surge Absorber, P6KE18A (Manufacture Designation), Q9000630 (VXSTD P/N)]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222577 Sat, 11 Apr 2009 22:11:15 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222490 --
One man's Magic is another man's Engineering.]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222490 Sat, 11 Apr 2009 21:45:11 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222331 http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222331 Sat, 11 Apr 2009 21:04:50 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222226 I seem to remember diodes with a "KE" in their part number to be more than just a "diode". IIRC, they're a surge supressor type similar to a Zener. I have some big diodes at home like that. *IF* I remember, I'll look for them when I get back home tomorrow afternoon.
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One man's Magic is another man's Engineering.]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22222226 Sat, 11 Apr 2009 20:28:35 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22221499
Just for la la's try nudging the center of that diode with an orange stick or some non conductive probe it is easily pop's open you didn’t break, it's already broke!

Leave the diode open re-fuse the unit with a fuse rated for the RECEIVE amperage, grab a fire extinguisher, power up and see what other damage awaits you.

Wayne
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If you cannot fix it with a buttset and some beanies you ain't a technician]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22221499 Sat, 11 Apr 2009 17:11:53 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22221310 http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22221310 Sat, 11 Apr 2009 16:22:58 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22220948 http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22220948 Sat, 11 Apr 2009 14:53:51 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22220932 http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22220932 Sat, 11 Apr 2009 14:50:43 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22220910 http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22220910 Sat, 11 Apr 2009 14:42:25 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22220888
Thank you very very much for your help! I hope one day I will be able to help you too!]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22220888 Sat, 11 Apr 2009 14:37:06 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219367
If you decide to cut that diode out of the circuit and the radio works after that, replace the diode. Don't leave it without reverse-polarity protection.

My 2 cents, take it for what its' worth.
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]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219367 Sat, 11 Apr 2009 02:41:31 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219350 ]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219350 Sat, 11 Apr 2009 02:32:34 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219196
Getting the board out to replace a component requires you to desolder the SO-239 from the baord on this radio. Be very careful not to bridge the connections when you fire it back up, Yeasu has a VERY healthy solder pool laid down from the factory here, thorough separation between the two solder pools is very important, I would recommend a lot of work with a desoldering braid on reassembly. But also make sure your connections are good, no cold joints!

edited for clarity.
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INFLOW-WI]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219196 Sat, 11 Apr 2009 01:18:25 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219194 http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219194 Sat, 11 Apr 2009 01:18:23 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219112
My bet is on the PA module, first thing I would do is unsolder and lift pin 5 to that and see what happens. I would put a small fuse in at that point, 1/4A if you have one, if it still blows your problem is somewhere else.

Let us know how it goes, and good luck.]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219112 Sat, 11 Apr 2009 00:44:39 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219052 I'm downloading a schematic now, I'll take a look and let you what else to check.]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22219052 Sat, 11 Apr 2009 00:27:40 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22218940 www.alldatasheet.com/datasheet-p···API.html

I took another look (not the pic, but at the radio) at it looks like its the angle of the photo. Plus:
»2.bp.blogspot.com/_J3BJClp5cnQ/S···+091.jpg

Would I be able put my multimeter on it and should any of the leads let through the ohm test (or not let through)?]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22218940 Fri, 10 Apr 2009 23:55:06 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22218889
You might test to see if it's bad.]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22218889 Fri, 10 Apr 2009 23:38:11 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22218856
»4.bp.blogspot.com/_J3BJClp5cnQ/S···+090.jpg

»2.bp.blogspot.com/_J3BJClp5cnQ/S···+091.jpg

»2.bp.blogspot.com/_J3BJClp5cnQ/S···+093.jpg

»4.bp.blogspot.com/_J3BJClp5cnQ/S···+094.jpg

»1.bp.blogspot.com/_J3BJClp5cnQ/S···+095.jpg

»2.bp.blogspot.com/_J3BJClp5cnQ/S···+096.jpg

»3.bp.blogspot.com/_J3BJClp5cnQ/S···+100.jpg

»2.bp.blogspot.com/_J3BJClp5cnQ/S···+101.jpg

»2.bp.blogspot.com/_J3BJClp5cnQ/S···+102.jpg]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22218856 Fri, 10 Apr 2009 23:30:31 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22212211 said by drjim:

They usually have a reverse polarity protection diode in the radio where the power leads come in. I'm not sure wht the specs are on the diode, but look for a big diode where the power leads solder to the board, and check it.
That was my thought as well, I had to replace one in that same radio once. Unfortunately it had other issues as well after I fixed it. . .

*cough* be real careful to make sure you solder the S0-239 back to the board properly.]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22212211 Thu, 09 Apr 2009 19:46:38 EDT http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22211149 --
One man's Magic is another man's Engineering.]]> http://www.dslreports.com/forum/Re-Yaesu-FT2800M-Broken-via-24-Volts-22211149 Thu, 09 Apr 2009 16:26:39 EDT http://www.dslreports.com/forum/Re-Yeasu-FT2800M-Broken-via-24-Volts-22209422
Can a sighted person confirm this and help with part location and testing?]]> http://www.dslreports.com/forum/Re-Yeasu-FT2800M-Broken-via-24-Volts-22209422 Thu, 09 Apr 2009 11:05:32 EDT http://www.dslreports.com/forum/Yaesu-FT2800M-Broken-via-24-Volts-22209380 »www.yaesu.com/indexVS.cfm?cmd=Di···chived=0

Ok, to make a long story short and get to the point, after a freak problem my Yeasu FT-2800M got supplied with 24 volts. :( Now, somewhere in the radio it is letting the current from one wire (+/-) through to the other wire, blowing the fuse as it should.

I'm at a loss for what to do... The radio was relatively cheap (under $200). I don't want to spend to much in repairs cuz I would rather have a parts radio sitting around just in case something happened to the new one. If the repairs are only a fraction of the cost, thats ok with me.

How much do you think it would cost to repair? How long to repair (local hamfest coming up)? Better to have a spare parts radio? Thoughts?

Thanks!

Edit: Title]]> http://www.dslreports.com/forum/Yaesu-FT2800M-Broken-via-24-Volts-22209380 Thu, 09 Apr 2009 10:58:30 EDT