How to repair a FT 991A with no receive on the first receive!

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The receive on my FT 991A wasn't working until you selected the pre-amps. Follow along as I try to repair what I think is wrong.Hopefully I can repair it.
MUSTOOL G1200 Digital Microscope, • First look-MUSTOOL G12...
Precision Tweezer Set, amzn.to/3QntZ2Y
Hakko FX888D-23BY Digital Soldering Station, amzn.to/3w0xd4n
KESTER SOLDER , amzn.to/3PlZRn9
Site that had info for this repair, www.commswg.si...
#Hamradio, #Howto, #yaesu,

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26 сен 2024

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Комментарии : 46

@FredGarvin-gr3vx 2 года назад

Tip- Use KAPTON tape to hold (most) smd's in place during soldering. (use a small exacto knife to cut the Kapton in small strips).. 73 , N6SPP

@Siskiyous6 2 года назад

I remember well the first time I opened my 7100 and soldered on it. Modern component sizes are very challenging. Well done Chuck!

@temporarilyoffline 2 года назад

I've been there brother... Its only fun when you're done!

@KK6USYHamRadioAdventures 2 года назад

Right? I felt a lot better after I tried it out .

@thuff3207 Год назад

Surface mount soldering is tough to do and very good soldering equipment helps. On thing I do is clean my tip well then put a blob of solver on it. Hold the part down and touch the blob of solder. Then its held in place to get the other side on. Nice job fixing the 991

@TheSmokinApe 2 года назад

Nice job with the repair Chuck!

@don_n5skt 2 года назад

Nice Chuck. I don't know how you knew that was the issue but glad you got that fixed.

@DK5ONV 2 года назад

Good morning Fire Chief Chuck (FCC). Hope your FT-991A is fully working again and gives you Hours and Hours of DX Fun. Happy weekend into California & 73 de YFUG 💯👍🙋‍♂

@dougrea8260 9 месяцев назад

I remember my first attempt with smd components. I was attempting a MARS mod on an HT . Got a component next to the one I was removing a little too warm and it dislodged and fell onto the carpeted floor. By chance, I did manage to find it and was able to remount it on the board without a microscope. Yes, I was pretty nervous during the process. Definitely not something for the faint of heart. Solid video and a great job. 👍

@johnk8091 2 года назад

Well done Chuck, always such a satisfying feeling to get it working again

@DonDegidio 2 года назад

Hi Chuck, Those SMD devices need some dexterity to change them out. Glad the repair was successful. You and your family stay safe. 73 WJ3U

@jasonk7jwn229 2 года назад

Shoog Nite! That was a close quarters repair. Well done Mr. Chuck! Thank you for the vid. Have a nice weekend. I am looking to get into single sideband on 2M. That 991 is the hot ticket.

@Screamingtut 2 года назад

Nice Chuck but your background Audio is drowning your audio out.

@KK6USYHamRadioAdventures 2 года назад

Thanks Kristyanna, I changed it twice and it seemed to change in the editing.

@Screamingtut 2 года назад

@@KK6USYHamRadioAdventures I had to raise the Audio up to hear you then the background music wiped your audio. I have a 991A but did not have the $$ for a 705 even though I wanted one. I got a G90 and an FT-981, I got them 3 yrs ago but have not even taken them out of the boxes. I have been waiting for some of my friends to help me put up my Antenna. when I moved to Oregon in June of 2020. I asked my club several times but it has fell on deaf ears. I talked to the president of the club who lives around the corner in the same park. I hope I can get my BB7V & my 80m/40m dipole made by Budd W3FF (he created the buddipole and was a friend, he helped me put up my Antenna at my old QTH in Dunsmuir, CA.

@janiceemery2008 Год назад

Excellent Chuck, I have the FT-991A also so that was very interesting for me. You did an excellent job at fixing it. Thank you so very much for sharing. KO4UWU 73

@Steven_VE9SY 2 года назад

You're a braver soul than I!!

@w.rustylane5650 Год назад

I think the audio sounds better on the Yaesu 991a sounds better than the Icom. I'm not prejudiced in any way 'cause I've got a 991a. Cheers & 73 from W Rusty Lane K9POW in eastern Tennessee

@1942Grampz Год назад

Nice job Chuck, I think with my age and eye sight now, I might have just soldered an ordinary small resistor in place with tweezers as it's only one resister and wouldn't take much room up. But good delicate job.

@AB1Vampire 4 месяца назад

Same thing happened to my FT-891 when it came to how I learned my Receive was wrong. . It was the Beacons that alerted me to the decreased Receive sensitivity.

@ozone385 2 года назад

Great video Chuck.

@forgetyourlife 2 года назад

I been checking into the 40m Noontime Net for years. That controller was Dion in Idaho.

@JayN4GO 2 года назад

Good job man. I shake so bad it would be comical to see me under a scope. Lol

@Mr.Modulation.StatenIslandMic 2 года назад

Great job chuck

@izzzzzz6 Год назад

D1113 is another component that often goes bad effecting various functions. I was thinking it was people incorrectly connecting devices to the aux ports but now i'm wondering if it's due to the bad grounding where various earthing points have been varnished over stopping screws from grounding out certain boards such as the auto tuner board. perhaps the pin diodes become damaged due to bad grounds in other parts of the radio. Glad you found the bad resistor on the att / pre amp relay.

@RobFoldenHamDIYmanWOWOO Год назад

Good Job! WO0WOO

@ATOMSHAMRADIO 2 года назад

That sucks good luck send it to yeasu

@doghouse94087 2 года назад

Agreed. Please no background music. Very distracting and we can't hear you. Thanks for the video

@mindblast3901 2 года назад

Well Done Chuck I hate those Sweaty Moments with Electronics all the best from UK 73

@ronknight3417 Год назад

this seem to be a common fault

@ansientwun 2 года назад

How did you determine the bad component was this resistor?

@KK6USYHamRadioAdventures 2 года назад

I did some research and found a couple sites that explained the problem. I posted one in the description, but I took the advice from another site and used the original part. Thanks!

@3henry214 2 года назад

Great info... I've been contemplating what to buy as my next radio after my HT and I like the 991A for having vhf/uhf. I'm curious, there are a few videos that talk about a common issue with the finals blowing, and it's related to the bias current being set too high from the factory. RU-vidr Doktor Vells posted a video on how to do the adjustment to back it down... have you done anything like that to your 991A? Got a big kick out of your T-Shirt... looks like we're both in Contra Costa Co. 73, KN6VMK

@KK6USYHamRadioAdventures 2 года назад

Hi Henry, the first 991 had final problems but not the 991A models. It is one of my favorite radios if you need any more info email me

@milwman1958 2 года назад

Next year grow some popcorn and see if you can work out popping some????? Don't think thats a QRP tho.

@205a2 7 месяцев назад

I can only hear the music, don't know why, voice is sooo quiet

@lb6ciradiostuff490 2 года назад

Omg, drop the music

@Bill-HRT 2 года назад

Chuck! How's it going?! Thanks for taking me along on this adventure. de Bill K0WHW

@tonytyler6390 Год назад

Good information..thanks..tony t.n0amy

@jstrunck 2 года назад

Practice makes perfect with smd. May try using a toothpick to hold down smd components down. Also, small solder wick (new) makes sopping ip solder effortless. You did good. 73

@KK6USYHamRadioAdventures 2 года назад

Good Idea with the toothpick, and I have the solder wick but I just forgot about it, Thanks!

@ATOMSHAMRADIO 2 года назад

Were you using the radio to another trancever near by its happened 😫

@KK6USYHamRadioAdventures 2 года назад

I think so not sure, I do a lot of testing and use my home antenna to judge so I might have put some power into it.

@ATOMSHAMRADIO 2 года назад

@@KK6USYHamRadioAdventures if another trancever is near by like a neighbor for instance keying up close to you you can pop the rf protection chip static protection my guess it happened to a fellow ham lived next to another ham his receve went out dead

@CapeCodCNC 2 года назад

As time goes on it gets harder to see and even worse keeping a steady hand, plus the parts get smaller. Or is that "just my magination" . The 991 sounds better than the Icom....JMHO... probably why I have one too.... and just got another Yaesu