Another fantastic video, Paul! Nicely done as always, and good catch on the cable mix-up. Watching your videos, I feel like I am being schooled by a master. Thank you for the education!
That was very cool. I didn't spot the VFO A cabling error. Are you just that familiar with it that it stood out so well, or is there a rationale for determining it, like actual markings, color coding, or a proximity rule (i.e., the coax plugs into the closest jack on that side)? I, too, would like to see the video of you putting the active probe into the Eico probe body.
I am also so respectful of your work ... you make things look so easy ... I hope I can gain knowledge just to look after my own equipment ... my TS940 IS IN GREAT SHAPE ... BUT SLIGHTLY OFF FREQUENCY ON RX &TX ... I will be looking for a video where I will be abl to achieve a standard as good as yours ... Thanks for the videos it gives me a great insight into electronics ... Many Thanks again ... Mike ... M0csi ... Manchester. UK
Mr Carlson, the big manufacturers should take a look at your videos. With all their millions they don't come close to the professional quality you achieve in your humble home lab. Thanks again. We are all lucky to benefit from your ability and efforts. Can't wait for the next one !
Excellent videos, explanations and insights! Thank you. Paul, how did you discern thathe coaxial cables were swapped?Great catch! (but surprised an owner capable of installing components did that)
Great video... i really appreciate your gift of logical pursuit.... having been in the radio repair business many years ago... watching many "shotgun repairs"... thanks very much !!!
Paul, Another fine video. Relatively easy one this time. The VFO A problem could have been avoided by taking an image before removing any cabling. Do make a video on fitting your RF active probe into that EICO probe body. Maybe a Tech Tuesday video? :-) I'm always amazed with the sheer quantity of test gear surrounding you when you open and close your videos. WB3BJU
Always nice to have the right tools and cables/connectors for the job...those pesky "TMP" coax connectors/jacks are hard to attach to if you want to measure something coming from or inject into a PCB. I added some homebrewed cables with BNCs on one end and the TMP on the other (RG-174 or similar small coax required). You can get the TMPs online and they're very reasonable and easy to solder/crimp onto coax. TNX for another great repair video Paul! 73 - Dino KL0S
I did see the coax mix-up right when you said something looks wrong here. Most of my component level repair has been digital and it's been many years. Your videos have inspired me to get into fixing radio gear. Thanks for that.
Somebody has fitted a Inrad Roofing filter Mod and got the wires crossed and not read the fitting instructions. I have just fitted one to my FT1000MP. great improvement to the imd.
Mr. Carlson-- on a Yaesu FT990, will changing the reference oscillator frequency (10.48576) also change the radio's displayed frequency? ie: on the front of the radio? Thank you, I enjoy your videos!
I am just beginning to set up my work bench. The equipment you have in your lab must've taken a while to acquire. Your videos are fantastic. You clearly explain the steps involved in removal and what to be careful of. You are a gifted individual in both creating the videos as well as electronics diagnostics and repair.
Hello From Mark/N4VER. I have a Yaesu FT-920 that I had a”Freak Accident” with. My FT-920 has the outboard Behringer Eurorack UB-802 that has a pigtail cable between the EQ and the 8 pin microphone connector on the 920. I was going to disconnect the microphone pigtail and unplugged from the EQ and the tip of the plug made contact with the cabinet of another radio in which I heard a distinct “Pop”. The 920 still has normal receiver audio and the transmitter still keys manually via the “MOX Button” on the radio as well as the antenna tuner still seems to function normally. I have tried the EQ which still seems to function okay. I do realize that Yaesu has not supported this radio for quite some time now and I do realize that this radio is old - But there’s nothing out there brand new that I like as well as this FT-920 unless I maybe found a nice FT-1000MP which is still a pretty old radio. My question is, Is the audio circuit in this radio destroyed enough to trash this great old radio? I have actually watched your work with the FT-1000MP some time ago and remembered you in what you accomplished. Thanks & Best Regards DE Mark/N4VER Versailles,KY.
I HAVE SEARCHED THE WHOLE CRAPPIN INTERNET, I HAVE ALL THE EQUIPMENT I JUST DON'T KNOW WHERE TO TAP FOR THE WIDEST BANDWIDTH ON MY YAESU FT-1000MP........................CAN SOMEONE PLEASE TELL ME THIS SIMPLE THING?
Would you happen to have an IC for this ft-757, MC1468050, Yaesu part #(SC82088P) my switch for the 500k step doesn't work, and I traced it to pin 15 of this chip, the voltage changes from 0 to 5V pressing the button, but 500k steps doesn't work
Hi, Is there anybody who can measure or tell me if you know voltage of REF internal signal (main oscilator) ? On service manual I only found freq (10.48576MHz) but no information about voltage amplitude. Thanx
Yaesu FT-900 Mr Carlson would this be a Good starter TRANSCEIVER to Learn how to use. And what 12 volt power source can you use. I have a old 12 volt converter from Radio Shack that I used long time ago.
Hi..i have a problem with My ft-1000mp mark v field with the reception..sometimes copy find and sometimes turns deft..I need a help for that problem..apreciate your help.. thanks
I have a FT-8500 2/70c mobile rig,i hooked it up to a small amp 2m,and it stayed keyed when i unkeyed the radio. It hurt my 2m receive,70cm is fine,works fine.its too much for me to fix,and the company,well,ive heard horror story’s about them,lol. Was wondering if that would be something you could tackle?
Hello Mr. Carlson, could I ask for your advice? I have Yaesu FT 1000MP reception works fine but as I start to transmit even when the power of 5W will close the fan and when I stop transmitting receive loss and after a while it resumes. Can a faulty 5V or 9V regulator do this? Or need to pass the source board? Thank you very much for your advice .... Peter
Another well documented repair. I did one of these some time back that had the same problem. The regulators seem to be a week point in this model. Like you I liberally apply heat transfer compound to the heat sink. I believe that may be what's making them go out so frequently, to much heat. Mike
Very well taught video I must say. I do have a Yeasu FT 1000 mp as well with a low receive audio and when transmitting , I hear myself echoing through the speakers. Any ideas
And.... here i am again. Need your advice. Got a cheap but hughe Variac core ( about 15 Amps). now i'm diy building a power connector arm to grab the voltage and amps. i have seen doing so by a carbon roll (which i built already) as well as by using a slider. Which type would you recommend and why? Thank you so much for your help in advance.
That was a breeze and much less of a fix than the previous model where you rebuilt the antenna switching board. Sometimes we come out smelling like a rose without getting poked by thorns. Yippie ! JK
Hi there. Do you have any information/advice on fixing FT1000 display lights not working. I have heard of a mod which replaces the light with a LED strip. Baz
Hello Paul. very good video. I wanted to ask if you can experiment with fm transmitters in the band 88-108 MHz, with 6L6 or 6dq6. to experimentally thanks
Nice video I’m having a similar problem as well my 9 volt regulator output is 8.77 volts is that too low? I’m not sure of the tolerance on the regulator
Interesting that 9v reg was faulty I remember another vid you did where it would not go into transmit , the very same 9v reg caused that problem.My ft1000 mk5 has a swishing white noise ie fades in and out can be heard when the rf gain at minimum and af at max and when the tx processer is turned up on transmit. I have tried a linear psu no change there. not sure if it is common on all ft 1000
yes Paul as usual good video, and wasn't too bad getting the problem solved. Yes Paul that RF probe sounds interesting. They are hard to come by those probes, Eico's then when you find them , you need a wallet with lot of green stuff lol lol 73's
You didnt explain what those 2 cables were and why you needed to reverse them You are over my head as to your e pertise but I do have a background in electronics but wouldnt have a clue to do that level of troubleshooting I love your channel and soooo jealous of all the fancy equipment even if I dont know how to use any of them lol I restore old radios and can operate a scope and signal generator etc. VE6 RDR Great video
So, the owner or a tech installed some crystals. They turned the radio on and it wasn't functioning. So they declare it "broken" and didn't double check the procedures they just performed?
I know little to nothing about electronic repair. I have be watching various videos and even your video which is way over my head it is still interesting. I want to be able to repair my own computer flat screens, tv's and other run of the mill garden variety gadgets.
In the previous repair of this model you designed and built a circuit board to replace the factory one. You had mentioned that those boards were a at times a bit of a problem. Did you ask the owner if he wanted to upgrade to the Carlson Board? Just seems like something to do so you won't see this one on your bench again for awhile.
Hi Mike, they were crossed, very east to spot visually. In any failure situation, always look at the modifications first, usually they are the culprit.
Hi Paul, I understand that, and I immediately began looking all around the (many) filters. But even now, looking at the “before” shot (21:15), it isn’t obvious to me that they were reversed; cables cross over each other all the time. I know I’m missing something, and I have a feeling I’m the only one, but what is it? Another great video; yours is the only channel for which I’ve seriously considered becoming a patron.
You should have sold them a Carlson's Lab RF Switching Board... Edit: I spotted the cabling error. I'm in no way educated in such things but I reasoned that why would they cross the cables over the top of one another when there was a clear isolated path for each to follow if reversed. Stuck out like dogs balls.
So what was the conclusion? Someone has been messing with the radio and reinstalled a board incorrectly by plugging leads into the board the wrong way and caused a 9v regulator to fry?
Another classic repair Paul Really enjoyed that. Always fun watching you troubleshoot as you explain what is going on. And another here for going with the active probe. I have an Eico probe just like that hanging in the rack. Would be a nice project for it. Thanks for sharing and a big thumbs up. 73 Buddy
Thanks for the beautiful and easy explanation how to proceed step by step in the troubleshooting of the transceiver. One should have at least two of the instrument you used like an oscillator -generator ant the necessary h.f. Probes. You have used too. Thanks very much for the lesson.abele.suisse
Tnx for rep.video Paul, very enjoyable to watch. It seems that the: "Thy shall always check voltages" is of good use and fine electronicks-mantra. :) ..Didnt see the wrong put internall coaxes at first though.--so perhaps an aditional nice mantra to "Thy shall always check for other misshap-tamperings" too .. --> and you are good at check for these things in your videoes. Thanks again, apreciate very much. br,Rolf
your videos are very good I have a ft-840 with low rf out put help. I need power supply and a good volt matter for my ham room. KEEP UP THE GOOD WORK. N8ZRH
Synthesized ,complex japanse HF rigs are probably, in my experience as a commercial radio and broadcast technician, the most complex and challenging devices to repair. They do often have good service manuals. This rig , I will guess without watching the whole video, has a audio PS bypass capacitor open or the board has an open trace. But Will watch the whole thing later and see, thanks for great videos, very skilled and well grounded in solid circuit theory, which is my pet peeve abut today's today's Voc school grads.....:(Ahhhh... a regulator....good.
Nice job.. I always have trouble finding 7809's... last time I was in my component store the only had 7885 regulators.... 8.5vdc... these things are great... they will work until they start smoking...
Just how smart are you? Just a great job! Keep up the good work! I have a beautiful old hybrid TS 830S sugar gold with all filters and has been revamped. Works perfect and has been for quite a few years now. It's my remote VFO that giving me troubles. Would you consider troubleshooting my matching remote VFO for the 830 sugar? Don't know how busy you are or what your specialties are? just thought I would inquire? Thanks again
Thanks for another great video. An Eico probe video would be nice. Small nitpick... The transition effects seem a hint garish. I would stick to traditional cuts, or fade to black and then fade back up (quickly) to show passage of time. Are they annoying? No. I just feel like traditional techniques work better. Nice Nixie porn! I have an older HP frequency counter than only goes officially to 300KHz (though is accurate to 600KHz). Great gear!
Hi Paul, Very nice! another great video. A yes from me on the probe video. It always fun to see how you trace down problems in a receiver. A suggestion for a short future video. :>) I don’t remember seeing an hi-pot in your lab video 7/14/14 (another good piece of lab equipment to have for tubes and vacuum variables etc.). Maybe you could do a build video and if you have one of the boards left over from the 7/06/15 Spectrum Analyzer Protection Circuit video you could actually see at what voltage it breaks down, or not, safely. You have done other hi voltage videos before so I think it would be appropriate. 73
Good troubleshooting Mr. Carlson. Those 78/79 series three terminal regulators require adequate heat sinking, especially when running at 75% of their rated output. These also have short circuit protection. from the Fairchild spec sheet, short circuit protection is around 250 ma. "Each type employs internal current limiting, thermal shut down and safe operating area (SOA) protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. " Interesting that even with it's built in thermal (SOA) and short circuit protection, these devices can still fail due to inadequate heat dissipation and thermal compound not being used. 14V to 9V drop across the device at 700 miliamps would indicate that at least 3.5 watts has to be dissipated by the series pass element inside the device. That would require adequate heatsinking. Your test device monster heatsink looks about right, unless there is adequate air flow around the device from the fan.
I've been a Motorola Two-Way Communications dealer/service center since '77. With that said, that FT-1000MP is something which I would not want to contemplate having to perform repairs on. Gimme an old MoTrac, or something ancient from Comco any day!!! With all of that said, that Yaesu is definitely a nicely constructed piece of equipment, and you've once again accomplished a quality job of troubleshooting and repair.
