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#54 Amateur Radio Repair: Yaesu FT-857 with no TX Power on HF and 50MHZ

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TRX Lab

TRX Lab

9 жыл бұрын

Troubleshooting and repair

Пікірлер: 212
@TexasCHLforum
@TexasCHLforum 9 жыл бұрын
Peter, I really enjoy your videos and I'm learning a lot. Your thorough explanations of what you are doing and why is very helpful. Thanks, Charles.
@John-lk5eg
@John-lk5eg 9 жыл бұрын
Great video! Thank you for sharing this "hands on" learning. I am feeling more confident in trying these steps myself.
@hamtrucker
@hamtrucker 9 жыл бұрын
Love your videos Peter! always a blast love to go through each project with you, you are a great mind, keep up the good work.
@TRXLab
@TRXLab 9 жыл бұрын
Derrick Plyler Hi Derrick, thank you very much! I'm glad that you like my videos. 73's
@dougbas3980
@dougbas3980 Жыл бұрын
Very useful! I have lost RF on HF and now I am so much more confident to troubleshoot and repair. MANY THANKS!
@hancecrawford
@hancecrawford 6 жыл бұрын
It is a joy to watch you at work peter and to learn :)
@karlfell3768
@karlfell3768 9 жыл бұрын
Your repair videos are always very informative and enjoyable. Keep up the good work. Karl
@TRXLab
@TRXLab 9 жыл бұрын
Karl Fell Hi Karl always nice to hear from you thank you.
@km6hvu622
@km6hvu622 6 жыл бұрын
I really appreciate you taking the time to explain what you are doing and why you are doing it. It has been extremely helpful to me. Thank you!
@TRXLab
@TRXLab 6 жыл бұрын
Thanks for feed-back 73
@bluesky32967
@bluesky32967 8 жыл бұрын
Thank you very much for your repair video. I have replaced a filter in the receive section in the past so I have been inside a FT-857D before. Now I have confidence to fix blown finals if the need arises. Thank you again.
@TRXLab
@TRXLab 8 жыл бұрын
+Bill Woody Hi Bill, thanks for watching and feed-back 73
@w.rustylane5650
@w.rustylane5650 Жыл бұрын
Still watching your videos. Keep 'em coming, Peter. I really enjoy watching a very good tech doing his magic on various radios. I sold all my test equipment years ago when I quit modifying CB radios for folks. I would open up a JC Penny's CB 40 channel CB so it would go above 40 channels, i.e., 27.405.00MHz and above. I drilled a hole in the top of my JC Penny 6241 SSB and inserted a plastic tuning wand into the frequency oscillator so I could swing it up + for going above 27.405.00MHz. PLL chips are really easy to re-program; you just cut a trace, add a resistor and either remove 5 volts or add 5 volts. I used to charge $20.00 per radio for the mods. I got my start into ham radio by first becoming involved in CB radios in the mid 70's. W Rusty Lane K9POW in eastern Tennessee
@lyntonprescott3412
@lyntonprescott3412 5 жыл бұрын
Very enjoyable. You are a master of your craft. Well done.
@DK-vx1zc
@DK-vx1zc 6 жыл бұрын
I really enjoy your videos Peter. Thank you so much for providing them Dan
@TRXLab
@TRXLab 6 жыл бұрын
You Are welcome Dan and thanks for feed back. 73
@SkyWire88
@SkyWire88 Жыл бұрын
Always nice to see that the new parts fix the main problem, right? Also, nice to see the new parts work as intended, instead of getting bogus parts from the supplier, which will drive the tech almost crazy. Another fine video Mr. Peter. Thank you.
@OrbiterElectronics
@OrbiterElectronics 9 жыл бұрын
Always look forward to your vids popping up on You Tube Peter. Thank you.
@TRXLab
@TRXLab 9 жыл бұрын
***** Hi John glad that you like and nice to hear from you..
@MrCarlsonsLab
@MrCarlsonsLab 9 жыл бұрын
Great job once again Peter! Always enjoy the adventure.
@TRXLab
@TRXLab 9 жыл бұрын
Mr Carlson's Lab Hi Paul thanks a lot for watching the adventure :-) So do I while watching your videos. Can't wait until your next expedition into electronics :-)
@grahamhobbs3558
@grahamhobbs3558 4 жыл бұрын
Great video and very informative. Learnt a lot more about this radio. I try to make time to watch all your videos. Thank you
@klausvonschmitto7508
@klausvonschmitto7508 Жыл бұрын
Excellent Video! Step by step diagnosis, repair, and verification. Perfect!
@fredbos5997
@fredbos5997 3 жыл бұрын
Very well done! I've got the same tranceiver. It works great and I hope for a long time. Thank you Peter. Greetings, Fred
@PLB4082
@PLB4082 7 жыл бұрын
Terrific teaching video....learned an amazing amount about the 857D, radio theory and practice. Particularly helpful to have the advice on heat dissipation and any attempt to 'stress' the radio by seeking to increase TX power. Thanks very much. AC2UQ
@TRXLab
@TRXLab 7 жыл бұрын
Thanks for feed-back and watching. All the best 73
@johncliff5417
@johncliff5417 6 жыл бұрын
Hello there Peter once more. Thank you for another very interesting video in the successful repair of the Yaesu FT_857. I do not know how I have missed this one from over three years since you carried out the work. Anyhow well done and I look forward to seeing more of your work on video. 73 de John - G0WXU.
@TRXLab
@TRXLab 6 жыл бұрын
As long you found the video John..all is perfect :^) Glad that you like my channel! 73
@EricTechstuffs
@EricTechstuffs 5 ай бұрын
Thankful for you video ! Purchased a 857D radio that was acting oddly. I went into the service menu and found values very out of spec Most at 0 !! I am glad I did not have to go that deep in the radio !!
@45AMT
@45AMT 6 жыл бұрын
Very good Repair. I enjoyed this. Thanks for taking the time to share with us!
@TRXLab
@TRXLab 6 жыл бұрын
Glad that you liked it and thanks for feed-back
@ipabrewerable
@ipabrewerable 9 жыл бұрын
Another nice video Peter. Thanks for sharing your expertise.
@TRXLab
@TRXLab 9 жыл бұрын
Jeff Thomas Thanks Jeff still glad that you like it :-)
@TerryGrahamx1b
@TerryGrahamx1b 7 жыл бұрын
Great video many thanks. I have the ft-857 with the same fault, your video is a great help . Good luck, Terry .
@TRXLab
@TRXLab 7 жыл бұрын
Glad that the video was helpful to you Terry. Thanks for watching 73
@charliefellenbaum9492
@charliefellenbaum9492 Жыл бұрын
Brilliant video and troubleshooting steps, I learned a lot, am grateful. However, I came here to compare my FT-857 to any other one to see what the DSP-2 module looked like, in case it was included. (I do not have a DSP-2 and wish I did.) To my surprise, this radio looks NOTHING like the PCB in my radio, not even close. I looked again from the beginning and at 8 seconds hear it identified as an FT-857D, not the previous plain "857" model. So I conclude that the _headline_ is in error as the all-important "D" was omitted, FYI. These two versions appear to be hugely different from each other. I'm tempted to go back inside mine and take the board out and look at the other side too, but I probably won't any time soon.
@greggaieck4808
@greggaieck4808 2 жыл бұрын
TRX Lab the Amateur radio yaes FT, 857 that you AR fixing is cool
@paulinmt2185
@paulinmt2185 7 жыл бұрын
Good work. Like your methodical approach to troubleshooting. Very helpful. I'm repairing an FT-450 that was transmitted into. Looks like both driver and final MOSFETs are bad in my case. Thanks & 73.
@TRXLab
@TRXLab 7 жыл бұрын
Hi Paul, thanks for feed-back! Good Luck with your FT-450. 73
@greggaieck4808
@greggaieck4808 2 жыл бұрын
TRX Lab that cool inside the Amateur radio yaesu FT, 857
@kevingray707
@kevingray707 9 жыл бұрын
Like the video very much. Please keep them coming Kevin
@TRXLab
@TRXLab 9 жыл бұрын
Kevin Gray Thanks Kevin for feed-back!
@alancordwell9759
@alancordwell9759 9 жыл бұрын
Great video as always Peter, thank you :) I think I can see a solder splash between the B and E tabs at 36:01 ;) which is giving the short circuit reading on that one. The 'scope showed you had DC bias of a volt or more on the bases which is more characteristic of open circuit B-E junctions. Your advice to change both is very sound. These RF power transistors often have 4 or more junctions in parallel inside them, and one or more junctions can fail open circuit. The device will still test okay with a DC meter, but obviously not work properly at RF. It's also worth pointing out that these devices contain beryllium oxide which is very toxic- don't try to open them up; and as you say always screw them down first before soldering or you will very likely break the case open and release the berylliuym- not to mention the magic smoke!
@TRXLab
@TRXLab 9 жыл бұрын
Alan Cordwell Hi Alan, you are right looks really like a solder splash. But also tested with DMM and sure that the trani is dead :-) Thanks for all your additional hints sure it is a valuable information for the audience.
@dinosworkshop6870
@dinosworkshop6870 9 жыл бұрын
The kind of video we like. Ham radio repair. Excellent!
@TRXLab
@TRXLab 9 жыл бұрын
Satellite_Guy Hi, yepp that is what we all like :-) Thanks for comment !
@charlieoscar09
@charlieoscar09 9 жыл бұрын
Super fault finding video...thanks for sharing this with us...I'm learning all the time.
@TRXLab
@TRXLab 9 жыл бұрын
charlieoscar09 Thanks a lot for watching and feed back!
@hobbygaertner420
@hobbygaertner420 7 жыл бұрын
My rig went dead today. I first thought I had this problem too, but I only have no TX power on AM. SSB is still working fine. AM does not work on VHF/UFH as well. I am not sure what the problem in my rig is, I will have to look into it on sunday. Anyways, thanks for this detailed repair walk-through! There's not a lot of people out there that would go through all this effort and show the whole repair including how to isolate / find the error.
@TRXLab
@TRXLab 7 жыл бұрын
Thanks for your feed-back. Hope you get your radio fixed...73
@truthseekers666
@truthseekers666 8 жыл бұрын
Very nice to see so much detail.
@TRXLab
@TRXLab 8 жыл бұрын
+truthseekers666 Hi, thanks for comment and stopping by! 73
@johngulliver6151
@johngulliver6151 9 жыл бұрын
Very informative video thanks for posting i look forward to the next one .
@TRXLab
@TRXLab 9 жыл бұрын
***** Thanks John for feed back!
@gamlemann53
@gamlemann53 7 жыл бұрын
Thank you very much for Your videos. I have learned a lot from them. Keep up the good work!! The best from LB1NH Arild
@TRXLab
@TRXLab 7 жыл бұрын
Thank you Arild, glad that you like my videos. All the best 73
@chunghawliew2956
@chunghawliew2956 7 жыл бұрын
TQVM for the sharing. Well done. Really enjoy your presentation. Good job
@TRXLab
@TRXLab 7 жыл бұрын
Thanks for watching 73
@iw0hex
@iw0hex 9 жыл бұрын
Thanks Peter for your video !!! Great as usually.
@TRXLab
@TRXLab 9 жыл бұрын
Pasquale IW0HEX Hi Pasquale, thanks very much! Did your meter arrive? best 73
@iw0hex
@iw0hex 9 жыл бұрын
Yes, I did. It works nice, good item. Thanks
@budleyca1
@budleyca1 9 жыл бұрын
Nice troubleshooting and repair again.. Bud...
@TRXLab
@TRXLab 9 жыл бұрын
budleyca1 Hi Bud, thnaks for watching and comment!
@CripSkillz
@CripSkillz 4 жыл бұрын
Great vids man thanks for sharing!
@topflite1002
@topflite1002 9 жыл бұрын
Wunderbar...enjoy watching while learning. Keep up the great videos. 73's ab2bj Fred
@TRXLab
@TRXLab 9 жыл бұрын
fred wolczowski Hi Fred, thanks for feed-back! 73
@Stitchesnstaplez
@Stitchesnstaplez 7 жыл бұрын
I'm having this exact issue right now. Thanks for sharing!!
@TRXLab
@TRXLab 7 жыл бұрын
Glad that the vid is helpful, Thanks for watching 73
@CT2GQL
@CT2GQL 3 жыл бұрын
Great video again Peter!, thanks
@TRXLab
@TRXLab 3 жыл бұрын
Thank you
@Perpendiculum
@Perpendiculum 9 жыл бұрын
Sehr schön anzuschauen und ebenso sehr interessant! Vielen Dank!
@TRXLab
@TRXLab 9 жыл бұрын
Perpendiculum Dei Danke Simon :-)
@JPHET37
@JPHET37 8 жыл бұрын
Thanks a million for showing us the video very educational and tutorial
@TRXLab
@TRXLab 8 жыл бұрын
+joe phet Thanks for watching and comment! 73
@AECRADIO1
@AECRADIO1 3 жыл бұрын
RD7MVS1is a somewhat fragile MOSFET device, but if not 'abused' will provide excellent service life. Vertex and Kenwood commercial portables use this device as a P.A transistor. Vertex(Vertex/Standard) which is now Motorola.
@624radicalham
@624radicalham 3 жыл бұрын
I have a Vertex VX-1700 and I haven't checked , but I do wonder if it uses the same final transistors as the 857D. I believe that 2879 finals can withstand more abuse, but if you think these Yaesu/Vertex finals are durable then this puts my mind at ease.
@Marc.B66
@Marc.B66 9 жыл бұрын
great job, I have a ft-857d. you've learned me a lot thanks 73'
@TRXLab
@TRXLab 9 жыл бұрын
dagat66 Hi, thanks for nice feed back!! 73
@Chrysiotis
@Chrysiotis 9 жыл бұрын
Another great video,thank you.
@TRXLab
@TRXLab 9 жыл бұрын
Chrysiotis Thank you very much ! 73
@1903A3shooter
@1903A3shooter 9 жыл бұрын
Nice vid. you have a great looking LAB. W4GSM
@baghdadiabdellatif1581
@baghdadiabdellatif1581 3 жыл бұрын
Great work. Thanks
@veuzou
@veuzou 6 жыл бұрын
when testing a possibly blown final, the current drain gives a good clue too. If nothing gets out and it drains 20 Amps, generally you know the final is OK but there's a problem in the next stages (filter, switches...) ; if changing the bias voltage doesn't change the current, the transistors are dead and it saves time ;-)
@sputnik4216
@sputnik4216 4 жыл бұрын
You'd think drawing heavy current with no output would be a shorted final hands down? OK, open relay or circuit connection on LPF board or something between the finals and antenna but ..... well, I'd keep your pointer in mind but have never seen it on about a dozen final repairs I've had to do over the years. Biggest problem is finding and paying for the !@#%! transistors! hihi
@veuzou
@veuzou 4 жыл бұрын
@@sputnik4216 yes, a final shorted to the ground (in this case the current will be constant : won't vary with bias) and I've seen a couple of times some trouble caused by an incorrect switching in the output filter units (cold joint, cracked cap, open relay, filter switched to the wrong band and stuck...) those radio always imagine something new to put us into trouble ;-)
@dennisqwertyuiop
@dennisqwertyuiop 9 жыл бұрын
Great repair nice video work,, Thank You Peter your the man
@TRXLab
@TRXLab 9 жыл бұрын
***** Hi Dennis, thanks for nice comment!! 73's
@williewonka8147
@williewonka8147 9 жыл бұрын
Very nice video, thanks for the information.
@TRXLab
@TRXLab 9 жыл бұрын
Willie Wonka hi Willie thanks for Feed back. 73
@zodar1400
@zodar1400 2 жыл бұрын
Excellent video thank you very much.
@walty28msn
@walty28msn 9 жыл бұрын
Great work,73 from brasil
@TRXLab
@TRXLab 9 жыл бұрын
Walter Oliveira Hi Walter, thanks for feed back! best 73 to Brazil!
@earlweb
@earlweb 9 жыл бұрын
Very interesting. Thanks for posting.
@TRXLab
@TRXLab 9 жыл бұрын
Gordon Webster Hi Gordon, thanks for feed-back!
@SixDegreesIntellectu
@SixDegreesIntellectu 9 жыл бұрын
I like it. Keep sharing them please.
@TRXLab
@TRXLab 9 жыл бұрын
Juan W5ZX Thanks very much for feed-back Juan! 73
@AECRADIO1
@AECRADIO1 3 жыл бұрын
I hope they are a matched pair. If not, one device might be driven properly, and the other, might be 'coasting' and not equally excited with the split signal from the input matching transformer. The HFe should be equalized to balance drive/output power.
@TTRVision
@TTRVision 8 жыл бұрын
I had an 2014 spec radio with the filter problem resolved by the factory. I opened the radio for 27 MHZ but the FM and AM modulation was so weak , especially on AM. I performed various modifications on the AF to improve the modulation....
@TRXLab
@TRXLab 8 жыл бұрын
+TTRVision okay very good, thanks for comment 73
@bjorlfale1872
@bjorlfale1872 6 жыл бұрын
Many thanks for your videos. I especially appreciate that you're distinctly speaking, to help foreigners to understand. I read several owners of FT897 and FT587d complaining that these TRX haven't really 100W in SSB mode. They see that the meter is showing RF low levels in this mode, too in France a seller is disparaging these devices. I got both (897 and 857) and I wondered if these transceivers are only showing average power, or if they are really poorly designed in the AM/SSB mode, as I read. What do you think about this claim ?
@TRXLab
@TRXLab 6 жыл бұрын
Thank you. No I have not seen a 857 or 897 which is not able to deliver 100W PEP. The problem often is that many watt meters are only able to display avg...73
@michaelmckenna9022
@michaelmckenna9022 2 жыл бұрын
I'm a vacuum tube guy, and must admit. The FT857 is an awesome radio.
@TRXLab
@TRXLab 2 жыл бұрын
yes very nice travel and outdoor radio
@educatedmanholecoverbyrich8890
@educatedmanholecoverbyrich8890 6 жыл бұрын
My brother say to heat the two screws very hot, then to screw them down to torque, saying that when they cool, they are pre-stressed and help to hold the chassis to the device much tighter, thus heat transfer does not come loose or strain the thread.
@TRXLab
@TRXLab 6 жыл бұрын
Hm to heat a metal up means the structure shrinks, well that might work out well. Will test it..73
@plantopguy5
@plantopguy5 9 жыл бұрын
Enjoyed much. Thank You.
@TRXLab
@TRXLab 9 жыл бұрын
plantopguy5 Thanks for feed-back
@mykolatsarynny
@mykolatsarynny 6 жыл бұрын
Hi, did you adjust bias only for one transistor, seems on video itis, there is two potentiometers to do separately for each transistor......
@ironman7261
@ironman7261 9 жыл бұрын
when you noticed the smaller lead length on that second output transistor i thought about a carlsons lab video where he replaced the same parts and then explained how to spot counterfeit copies . The smaller lead length was one way hopefully you will not be seeing the same radio back too soon.
@TRXLab
@TRXLab 9 жыл бұрын
+iron man Hi, fake transistors are always a problem these days you never know what you get. The problem is that all DC parameters are identical but the dynamic parameters not. That means that this transistors do not have enough gain over the entire frequency range. Example on 80m full 100W output. on 20m only 50W and on 10m only 10W. In this repair the new transistors are working over the entire frequency range so no problem what so ever. Thanks for asking.
@VK5IR
@VK5IR 9 жыл бұрын
Thanks for the great video! How much did the new finals cost?
@TRXLab
@TRXLab 9 жыл бұрын
***** Hi thanks for feed back. Finals are about 50$ each.
@theexperimentalcqdx4208
@theexperimentalcqdx4208 Жыл бұрын
I have a Question: My SWR is 1.2 however I've got a clicking relay delay on CW, even if I set the delay on FULL, the clicking is normal, but with use of about 3 min the clicking gets more and more scrambled. I've done a full factory re-set and it solves the problem for a few min of use, then the scrambled clicking noise comes back again. I've also put an in-line 1.1. Balun to try solve the problem IF RF is making it back down the antenna. Any suggestions ? It's almost like the radio builds up capacitance somewhere, then gets confused during CW transmissions
@jdotson41041
@jdotson41041 11 ай бұрын
I wish you showed soldering them in I have one I have to replace the finals on as well
@michaelswindal428
@michaelswindal428 9 жыл бұрын
Great video with thorough explanation. Are you required to wear the anti-static wrist strap during the entire process of handling the circuit boards?
@TRXLab
@TRXLab 9 жыл бұрын
Michael Swindal Hi Michael, thanks for feed back! No it is not really required but is sometimes a good idea as you can't really predict ESD voltage levels...
@cyclecamp1
@cyclecamp1 3 жыл бұрын
Hi, I have an FT857 (no D), 50mhz, vhf, uhf work fine, low or no power out on 1-30mhz. I assume since 50mhz is full power that the HF finals are ok. I do have a blown Q3006, part of the ATAS short circuit sensing circuit. Do you think this could be causing the issue? Any help in further diagnosing this would be appreciated.
@grantfullen9559
@grantfullen9559 9 жыл бұрын
Good video :)
@TRXLab
@TRXLab 9 жыл бұрын
Grant Fullen Thanks Grant!
@Scott-K7sce
@Scott-K7sce 8 жыл бұрын
i have this 857d in my car i have to look at the settings. but it works just fine. only issue is the vfo is really lose i have to keep it locked if i'm mobile in the car. i also have the 897d. i went into the settings in it find it was nearly all wrong i had to set 85% of the radio to spec. it works great now :) i dont have the tool to take the knob off the 857 to look at it and fix it... so it stays as is for now 73's k7sce
@TRXLab
@TRXLab 8 жыл бұрын
+Scott Edick Hi Scott, as long everything is under control it is perfect.. Have fun with your gear. Thanks for watching 73 Peter
@af4k
@af4k 5 жыл бұрын
Isn't there an adjustment for VFO knob tension?
@gaelc13
@gaelc13 7 жыл бұрын
Very interesting, and worrying since I just got a 857D which appears to transmit no power on HF (I did not test the U/VHF yet)... I hope this is nothing like this (It should not since it is supposed to be new)... fingers crossed.
@TRXLab
@TRXLab 7 жыл бұрын
Oh yeah fingers crossed...hope your radio is okay 73
@rancherodave
@rancherodave 8 жыл бұрын
Not watt vatt!! Either way great video and have had the same radio great radio after having it for a year. Mine is also mars modded and I haven't had any problems with it. Also think it is just nature of the beast with these new radios, they are not the greatest on am, also have a ft-991 I just acquired, and it is the same on am, audio not that great. Think these new radios are mostly designed to work on the ssb modes, and fm and am is just a secondary thing.
@TRXLab
@TRXLab 8 жыл бұрын
+rancherodave Thanks for comment 73
@GaryLordsWayMinistry
@GaryLordsWayMinistry 3 жыл бұрын
I am really surprised Peter didn't check the gain on the push pull transistors to make sure they were close to being a matched pair form the factory. Surely he must have done that first before installation. I know I would have checked them first before even applying the thermal compound to the transistors. Plus you need to tighten the screws down first before the soldering is done to make sure there is no stress on the legs of the transistors in the circuit, then solder them in.
@TRXLab
@TRXLab 3 жыл бұрын
You are absolutely right those transistors have to be matched . We buy this transistors as matched pair so that is already done. And it is true that the screws have to be tighten before you solder the transistors in. Thanks for the valuable contribution to our community when I have missed it to tell.
@williewilliams1481
@williewilliams1481 2 жыл бұрын
I really enjoyed the video. I have a 857 D with this problem ,I needed this , where can I buy these matching transistors ?
@TRXLab
@TRXLab 2 жыл бұрын
Thank you. Matched pairs are available by yaesu
@wb8vqv
@wb8vqv 9 жыл бұрын
Enjoyed the video as always but I sure would like to see how you solder and de-solder those finals. I have never done it before and would like to lean. Thanks from Dave, WB8VQV
@TRXLab
@TRXLab 9 жыл бұрын
wb8vqv Hi David, ah okay will show it in a future video, it is a bit tricky. To get finals out is a combination of desoldering gun, normal soldering iron and hot air. Thanks for feed-back 73's BTW, nice tower you have :-)
@wb8vqv
@wb8vqv 9 жыл бұрын
TRXBench Thanks Peter!!!!
@John-lk5eg
@John-lk5eg 9 жыл бұрын
TRXBench Yes I too would like to see the actual de-soldering and solder job on the finals. Also a little more on the setting of bias (locationof probes procedure) are there 2 posts that have a jumper across them that is removed 1st?
@TRXLab
@TRXLab 9 жыл бұрын
John I Hi John, I have a video online explaining the bias process. Additional to that I explain the bias setting in my ultraforce video as well.
@arafebi5414
@arafebi5414 4 жыл бұрын
ft857 of mine VHF RX output max 25 watt on RF power set(no-057) 50 .what must i do to back get 50watt?
@sraiken
@sraiken 3 жыл бұрын
Excellent, thanks. Do you have a video on ICOM 880? Thanks
@TRXLab
@TRXLab 3 жыл бұрын
no
@hancecrawford
@hancecrawford 6 жыл бұрын
Hi peter just were you fitted those 2 mosfets to the right is that mosfet different to the other ones you replaced as if it had been repaired before.
@TRXLab
@TRXLab 6 жыл бұрын
Not sure what you mean John..
@kevinkang4308
@kevinkang4308 4 жыл бұрын
Nice video. How to de-solder the finals with one soldering iron?
@Gw0wvl
@Gw0wvl 3 жыл бұрын
Desolder one lead at a time , It's very straight forward .
@hancecrawford
@hancecrawford 6 жыл бұрын
Peter having looked at this repair I wonder why they have 1 censer on 1 of Transistors and not on both maybe this would protect the radio from serious damage just a suggestion would a 2nd heat censer fitted to the other transistor help to protect the radio?
@TRXLab
@TRXLab 6 жыл бұрын
consumer electronics is always cost sensitive 73
@davidlewis1701
@davidlewis1701 7 жыл бұрын
No problem, just got to shop around.. I went straight to the manufacturer. .
@herbertsusmann986
@herbertsusmann986 9 жыл бұрын
Did you buy a matched pair of transistors? Also, will you be checking the harmonic and spurious output levels before sending it back?
@TRXLab
@TRXLab 9 жыл бұрын
Herbert Susmann Hi Herbert, yes of course this is a radio with one single bias control for both finals so you need a matched pair. A radio will never ever leave my lab without TX IP3 , harmonic and spurious test after PA repair. Thanks for watching and asking 73
@Beretta96Dan
@Beretta96Dan 8 жыл бұрын
Hello Peter! I was wondering if check the power in from the driver, and power out from the PA via an oscilloscope is not an option. Does the oscilloscope load down the PA, and could cause damage to the PA? Thanks for all your videos! Regards...Dan
@TRXLab
@TRXLab 8 жыл бұрын
+Beretta96Dan Hi Dan, well the respective stage was always terminated as off course needed. The driver was terminated into the PA input broadband transformer and the power output of the PA was terminates into a 50Ohm dummy load so not problem at all. 73's
@DavidS-iw4ei
@DavidS-iw4ei 7 жыл бұрын
I liked it.. Thanks
@TRXLab
@TRXLab 7 жыл бұрын
Thank you David 73
@Mr_Meowingtons
@Mr_Meowingtons 9 жыл бұрын
Is that filter cap bulged on the PA bored? may have just been the light?
@TRXLab
@TRXLab 9 жыл бұрын
Matt K Hi Matt, no cap is okay must be the light. Thanks for comment.
@kostasa50
@kostasa50 8 жыл бұрын
nice video,,,do you have any idea if the tx power on hf is only 45 watts?
@TRXLab
@TRXLab 8 жыл бұрын
+DeSoLaTE GuS Hi, to many reasons can be the cause for this problem. Sorry can't help from the distance... 73
@W4BIN
@W4BIN 7 жыл бұрын
He consistently said "RF" when he meant to say "HF" mostly in the first half. (as in RF band/s)
@santasl
@santasl 7 жыл бұрын
it bugged me as well, but nevertheless I found the video quite helpful as I intend to buy a FT-857d for myself.
@VideoRanger
@VideoRanger 5 жыл бұрын
I like how methodical you are in diagnosing a problem. You test as far as can be tested, before replacing a component. I believe this is the best way to teach. Thank you.
@Subgunman
@Subgunman 7 жыл бұрын
I would replace the pot with a multi turn pot if it will fit in. Manufacturers cut costs by using single turn pots when a multi turn would be better. Also I have seen pots fail due to under sizing their ratings and in the end they wind up with a bad spot on the resistance trace.
@af4k
@af4k 5 жыл бұрын
My FT857 works BUT all of a sudden I can't change BAND! The BAND switches UP/DN just ignores me. Tried to remove the head but it seems stuck and doesn't want to pull off. Don't want to break it. Does anyone know what I did wrong this time? The only things plugged in are MICROPHONE, ANTENNA, POWER and EXT SPKR. Anyone have any clues for me? AF4K Bry
@blpblp-tj7ux
@blpblp-tj7ux 3 жыл бұрын
this is the first time I've seen you using a grounded wrist band...am I not paying attention, or do you usually not use it?
@TRXLab
@TRXLab 3 жыл бұрын
We always use a grounded band but 70% we wear it at the ankle...
@natureman70
@natureman70 9 жыл бұрын
sehr geniales video! dein englisch ist klasse. ich glaube ich kann noch viel von dir lernen als angehender ham. eine frage... warum das blaue armband ab minute 48:00 ??? um statische aufladung zu unterbinden? 73!
@TRXLab
@TRXLab 9 жыл бұрын
Natureman Hi, vielen Dank für das positive feed-back. Ja, absolut richtig, das Armband ist dazu da, um vorsorglich jegliche mögliche Aufladung abzuleiten, damit empfindliche Bauteile nicht beschädigt werden können. Viel Spaß auf dem dem Weg zum HAM. 73
@hbugvi2010
@hbugvi2010 2 жыл бұрын
Thank you , it is very informative video....de Hasnat AP2HA
@yv4dr
@yv4dr 4 жыл бұрын
Greetings, I have a similar radio FT857, the fault is that in FM mode I have power in all bands. When switching to AM, CW mode, SSB loses power. It does not transmit in AM, CW, SSB modes and in FM mode if it transmits. What can you tell me about this fault YV4DR David
@harrybatt998
@harrybatt998 Жыл бұрын
Did you ever find what the problem was, as I've seen these exact symptoms mentioned many times?
@luizantoniolopes3153
@luizantoniolopes3153 7 жыл бұрын
POR FAVOR , ONDE LIGA NO 857D ?
@Joe_HamRadioGuy
@Joe_HamRadioGuy 3 жыл бұрын
I had one of these kinda miss it.
@34813ctr
@34813ctr 8 жыл бұрын
Hello Paul I also have a 857D one day it would turn on the next day it wont. Is this an easy fix. I would like to use it as a portable in my pickup.
@TRXLab
@TRXLab 8 жыл бұрын
+Burt G Hi Burt, no way to identify from the distance. Sorry
@radioamatore71
@radioamatore71 9 жыл бұрын
TRXBench good morning, my name is Antonio and I followed with pleasure his illustration, if you could please let know the Yaesu entered the famous "blocking capacitors" on three capacitors that were once signed TOKO? I hope for a response, the greeting cordially
@TRXLab
@TRXLab 9 жыл бұрын
radioamatore71 Hi Antonio, thanks for comment. I' m sorry I' m Not sure what the question is. Can you try to explain?? 73 Peter
@Species-rj9si
@Species-rj9si 6 жыл бұрын
Did I miss something? If the finals were toast, why were you getting RF output on 2 meters & 70 cm?
@TRXLab
@TRXLab 6 жыл бұрын
70cm and 2m are using their own final..73
@Species-rj9si
@Species-rj9si 6 жыл бұрын
Tnx es Vy 73.
@richardp4548
@richardp4548 4 жыл бұрын
Very methodical - presume nothing :) I would have offered to replace front panel knob too. But why did the finals fail?
@AECRADIO1
@AECRADIO1 3 жыл бұрын
These devices are not protected for short/open circuit output protection so continued open circuit conditions can cause them to fail. I noticed no feedback in the base/collector junction to track current gain(which matched HFe balances) for the output stage. Current draw should be equal between both devices.
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