#176

[@CarlosAvellanet]

This is great! I ran into this video while searching for some information on another radio and it reminded me I have a Taiwan made HR2510 somewhere in my closet. I purchased the rig as part of a batch of three non working radios about 6 years ago, two HR2510s and one HR2600. The 2600 had a dead CPU and was used for parts. The worst looking 2510 worked like a champ after I replaced the power cord and it still works to this date. The second was a virgin 2510. I don't even think the covers had ever been removed before I did. I worked on it for a few hours but moved on to more interesting projects I had on the front burner. The rig ended up on a shelf in my closet for another couple years. The video reminded me that I was also missing some transmit voltage on several transistors and last I remember I was tracing voltages to IC104 before putting it away. Sure enough, I didn't even check them and went straight to replacing the two capacitors on the video and WHALA! The rig is transmitting like a champ on all bands now. I did not have 220uf 10V caps so I used a couple of NOS 220uf 25V I had in my junk box. Thank you!

[@andken62]

A very precise straight forward and to the point approach that produced the desired result. As a repair technician myself I find this to be a very simple approach that enables the novice to understand. I wish repair guides were this easy to understand,thank you W2aew from V31HS.

[@AppliedScience]

Nice fix! It's really interesting and helpful to see someone's troubleshooting process in action. Thanks!

[@w2aew]

Thanks Ben. Just curious, did you get my package of ICs? No hurry at all on the SEM pix, just wanted to be sure the parts got there.

[@AppliedScience]

***** Yes, I received the chips in good condition. Thanks. I'll make an IC-based SEM video soon. Looking forward to it!

[@anthonyhinds7010]

This video was a great help to me, I had a President Lincoln in storage for a while with the same problem, thank you very much for this video it was a great great help.

[@tonydexter7574]

Most excellent insight and troubleshooting, Sir! I had recently been handed the same model with no transmit, but my focus was toward the programming chip rather than a physical problem. Will bench it again tomorrow, and based on your research and approach, will attempt to bring this HR2510 out of it's "storage blues." Thanks to KZbin also for helping preserve an almost forgotten line of technicians who believed in repairing---not replacing! T. Dexter, Blue Hippo CB Shop, Alabama

[@williamogilvie6909]

Great video. I owned one of those rigs 20+ years ago and used it mobile a few times. I wish I hadn't sold it.

[@ComputerLearning0]

It's funny how many people tend to put white paint in the knob indicator indents. This is something Uniden should have done for the 2510/2830/2600/LINCOLN. They painted them on the Radio Shack model HTX-100, which use the same exact knobs. I've owned numerous 2510's, a couple 2600's and a Lincoln over the years but nowadays I have but a single 2510 left in near perfect condition. I had a spare logic board with a ChipSwitch installed so I swapped it out to be able to operate the 12-meter band, which it does to perfection.

[@mattgacht5840]

Good stuff . No nonsense approach to the repair . It's funny to watch people try to do a repair and bypass the easy stuff . Block diagrams help tremendously and are often overlooked

[@w2aew]

Thanks! Yes, block diagrams can be incredibly useful!

[@TheBrforsberg]

Just 1 week ago I watched a video from TRX Bench troubleshooting a President Lincoln radio, which looks like the same radio. He had the same problem and replaced the same 2 caps. Must be a common problem. Thanks for sharing.

[@K7AGE]

Logical step by step troubleshooting.

[@RomanBobrek]

Almost like my Lincoln... :P

[@nsixjrz4941]

Still have mine safely stored away for emergency in case my IC 7700 or IC 7000 decide to take a rest!!! Love my 2510 still

[@PaulMoorhousehankooks]

I bought a hr2510 of a auction site When it arrived no tx But the problem was at the rear of the radio, No plug So I ordered one Fitted it Now works great M7HIH

[@robhalcro6110]

Right on the money ! My Hr 2510 has the same problem ! I don't have a schematic so I used your troubleshooting to find the problem on my radio ! BTW it was a cap used for a filter to the IC chip . Thanks ever so much , super presentation

[@raulmorales1944]

Excellent, I congratulate you for the video, the explanation is very good, I love that radio model, old but it works. thank you very much, 73s from Caracas

[@timwalsh7410]

Wanted to know what you know for 65 years❗️ good job…

[@LostinMND]

Good repair. On that weak cap you found. Knowing the history of the radio, I usually go around and find the remaining caps that are made by the same manufacturer and check those too. I usually find several more weak ones..

[@w2aew]

Yes, I recommended that to my friend when he picked up the radio.

[@petrimillar7408]

Thank you for sharing, had totally the same issue with mine. 15 years unused in the closet and did not transmit, 220uF cap close to display was shorted. Fast and easy fix!

[@alfonsoram9276]

Mine didnt transmit after sleeping few years... do you think mine has same issue? On my you keyup and nothung happens, any ideas?

[@RonanCantwell]

Another great video. It's nice to hear your flow of thought from symptom to cause to cure.

[@rondellschuyler7074]

This is my favorite 10 Meter radio for sideband. A few radios on a oscilloscope are similar, but none other than amateur radios are this good. Imo

[@RadioHamGuy]

Great video as always, was fun to follow along in the style you do it. Makes it easy to follow. I used to have one of these radios years ago when they first came out and had a lot of fun with it. Yes, seems like bad caps are sure a common problem on older gear like this from what I see here working on things also. 73

[@JahanZeb1976]

Excellent video dear mate. Great work done. Love to watch such repair videos. Keep up nice work and upload as much as you can. Regards,

[@TheRogerx3]

Mate.. must be from dear old blighty : ) .. Me old mucker.

[@jcims]

I wonder how many tons of electronics are sitting in landfills due to bad electrolytic caps. Nice walk through and solid favor for your friend! Win win for us all. Thanks!

[@gorak9000]

Heh, between caps and zener diodes, probably 90% of what's thrown out that's broken (vs. what's thrown out just because it's not wanted anymore which is going to be a lot more than you'd expect). If it's power supply problems, caps is always the first thing to check! I've got a small digikey box that's filling up with dead caps I've replaced in all kinds of stuff. There's probably less than 10 or 15 non-cap parts vs the rest of the box full of caps!

[@CMDREagle131]

I just got a Realistic HTX-100 that does pretty much the same thing! I'm a total newbie when it comes to electronics, but thank you for giving me a great new lead to look in to!

[@alexandretsilefski2308]

Hello, I enjoy this video! I have the same trouble on my President Lincoln: tx indication is here but no transmitted power. I went to the 100 Ohm resistor but ~7Volts on each side. I will try to investigate more. Many thanks for sharing this video. Alexandre Tsilefski.

[@SeanBZA]

Nice simple and good logical fault finding there. You probably will find that the other 220/10 caps will fail in the next few years as well, probably would be best to proactively change them if 2 were either low or dead already, using 220/16 or even 220/25 caps.

[@w2aew]

I'll recommend that to my friend when I return it to him.

[@BalticLab]

Finally found some time to catch up with my subscriptions. Lots of good videos Alan! I used several of these radios as well as the HTX-100 for microwave communications. They make excellent radios to be used with transverters.

[@TRXLab]

As you already said Alan, we know it from the experience... 95% are bad caps..Nice video..

[@iw0hex]

The same fault in TRXBench video (President Lincoln don't trasmit), very nice ! Thanks

[@charlieoscar09]

Great Video and nice explanation....Really liked your troubleshooting technique to find the issue...Picked up a few hints and tips watching this....thankyou

[@qrplife]

Thanks for the video OM. I have the same radio and it is "deaf" and the rx signal strength meter is always pegged. I am inspired to give troubleshooting another try.

[@qrplife]

Thanks again to OM W2AEW For the inspiration to troubleshoot. I dug out my "deaf" HR2600 and with a schematic in hand started to look at the expected voltages along the received signal path. The first transistor (Q1) had the correct voltage on the collector and base, but the emitter was way off, 6v instead of less that a volt. I traced the control of this voltage back to the RF gain pot. One side of the pot was supposed to be at ground but was not close(again about 6v). Turns out the pcb trace on the sub board that connects the RF gain pot to ground was broken. I patched it by soldering a small piece of wire across the gap and the rig receives just fine again. And the signal strength meter operates normally now.

[@w2aew]

qrplife Excellent!

[@Kryoclasm]

Very good troubleshooting theory. By the book, follow the power.

[@francisharris5044]

Great job step by step troubleshooting! Nice O-scope!

[@grantfullen9559]

Thanks so much for making these repair videos. I lean allot from them.

[@barryshapiro8894]

great job presenting the repair Mike, thank you again!

[@bobrenfro3080]

Feed audio from the PA output to horizontal scope input, switch to external sweep and you will get the easy to interpret trapezoid pattern. 73, K4OF.

[@TonyButchT]

Very helpful troubleshooting lesson! Thank you for the video!

[@TheErod1944Channel]

Maybe I've been around radios too long but your repair video is actually kind of exciting....... Good Video.

[@DeeegerD]

I just saw TRX Bench do the exact same repair yesterday while watching some of his older vids. Obviously a common problem on this model of radio.

[@1903A3shooter]

Great vid, logical step by step. I can see me digging in the PA and scratching me head.

[@robertcalkjr.8325]

Thanks Alan. When I fixed my Cobra CB radio, I found a 1/8 watt resistor that had a broken lead. Looking at it with my digital microscope, it looked like the lead had slightly been bent back & forth many times until it broke. Seeing how that is impossible inside the case, can a resistor operating at it's wattage limit, vibrate until the lead snaps? That's the only excuse I can come up with. The lead had no cut mark or scratch. I replaced it with a 1/4 watt resistor and it works great.

[@w2aew]

It was most likely damaged during assembly, or possibly by a previous owner.

[@AntiqueRadioandTV]

Nice bit of troubleshooting on that rig. Thanks... I enjoyed it!

[@KB5WQW]

I've got some non xmitting CB's laying around here and you gave some ideas what to check, Thanx!

[@tectalabyss]

Fantastic trouble shooting has always. Your videos are a big help.

[@vivianleslie5747]

Quite detailed, lovely. my problem is with my 2600 that has a chipswitch. it does not transmit or receive. the TX indicator comes on but the frequency display switch to Err 3 when it is keyed up which I suppose is an error. can you help me please.

[@WestCoastMole]

Hi Alan Something else for the Viewers to consider is employing the use of a "Low Ohms" (ESR Meter) to test the ESR of the Capacitors when doing these Shoots. Although it probably would not have he provided much direction in this case ESR Meters have one very elegant property, they can measure the ESR of a capacitor while its in circuit. There is no need to desolder the cap from the board in order to use an ESR Meter. They are an effective time saver plus it reduces the wear-and-tear on the PCB from desoldering and resoldering capacitors.

[@w2aew]

Bob Marston True - but you have to apply common sense too. High ESR is only one of many failure modes for caps, so it won't catch everything. Also, other good caps in parallel with a "bad" cap will hide the bad cap from showing a poor ESR. In this particular case, the two 220uF caps were in parallel. So, even if the "weak" cap that I replaced first did have a faulty ESR reading, the shorted "bad" cap would have made the the ESR reading look good.

[@robertcalkjr.8325]

***** Yep. Always better to check them off-board.

[@umajunkcollector]

This model is often hacked by CBers. So if you get one from an unknown seller, chances are troubles could be from tampering. good vid, thanx, 73, Don

[@alfonsoram9276]

Any ideas as of what the problem might be on mine? When i key up, it doesnt do anything, as if i didnt pressed the ptt... i had fixed the mic condenser recently and after a couple of transmissions, it began not transmitting... radio was parked for few years...what will be the line of approach on it? Should i do as you did on this video? Ill appreciate any help. Thanks

[@franciscolopez3229]

Just saw this video. I have same radio a friend gave me last year. I got to use it for almost a year but eventually the receive begun to weaken both audio and signal. What do you should I do to fix it?

[@GusNava]

Good video thanks for the info

[@namjignerak]

I like this video, bad caps replacement, radio repair.

[@321CatboxWA]

I enjoyed your video its well done. I am off to the bench with the same problem. thankyou!

[@heathwhittle4514]

Thanks for keeping it simple! Great video! 73, Heath N4TWT

[@tallbiker6758]

Ok, I did the caps, still no transmit. Final Bad? I have a mrf497 to replace it with. What should bias be? 5v?

[@TheRogerx3]

Nice run through, Thank you always interesting.

[@ElektroLUDIKITS]

For those who are wondering : yes, it is exactly the same transceiver / CB-radio as the « President Lincoln » sold in Europe.

[@PeterWalkerHP16c]

Yep. I have one of those babies.

[@berkmanyt]

Thanks for the timely response per scope hookup. I think I watched where you used a spare port on antenna box per coupling. I also viewed your Piscataway hamfest…like to attend the next one walt K2CXP

[@w2aew]

That's a bit of a drive for you, but hopefully it'll be a nice turnout like last year.

[@ruhnet]

Wow---very nice. I had one that had the same problem---just sold it the other day for parts---I wish now I hadn't :-) 73s

[@automaster209]

I was wondering where you get your service manuals? I have an HR2510 and feel I might have some capacitors going bad. If I leave the radio off for a while and turn it on, nothing happens for about 15 minutes like there is no power then it is turned on, then the LCD shows information and the transmit and receive start working after that 15 or 20 minutes almost like it is warming up. After that it seems to work normally each day. Only happens when it is off for an extended period of time.

[@w2aew]

I usually try to find service manuals online, or I'll order them from someone like manualman.com. In the case of the 2510, the owner of the rig provided the manual, and it was returned to him after the rig was repaired. Sounds like a very strange problem you have. I'd start by measuring the internal power supply voltages during this weird warm-up time.

[@automaster209]

Thank you very much fro all your help. I will let you know what I find.

[@renohuskerdu4592]

I have one that went in storage 23 years ago and just came out with no rx/trx. Do you still do repairs?

[@w2aew]

Sorry, I don't

[@blackopsmorano]

I have the 2510 also on the bench, Both of the 220uf caps were shorted, I replaced both with new 25v caps, but still no tx, I checked voltage on ic104 all but #3 pin were good, but pin 3 has 4.1v on rx and 2.6 on tx and should be, but not the 4.1 on rx, I have not gone any further on voltage checks, but I thought you may have some ideas as to what could be the cause for the high voltage on pin 3. Thanks Bob.

[@w2aew]

+blackops1966 morano Sorry - but the manual and schematics I used to repair this rig went back to the owner once I repaired it, so I really can't help.

[@blackopsmorano]

Ok, no problem, I'll keep testing, I have not got into it much, but will keep looking, I will check q129 it is part of pin #3

[@blackopsmorano]

+w2aew Alan, I found the problem!, it was L136, it was a bad solder joint, just a quick solder job and up and working good as new again. W2RHS

[@w2aew]

+blackops1966 morano That's awesome - those bad solder joints can be a real bear to find sometimes!

[@juandavidbarrada]

Impeccable explanation, thank you very much!

[@W-733_KWX]

When an aging radio like this particular one comes after a long storage the caps are always suspicious. At that age (over 20-25 years) we automatically replace most of the electrolytic caps to spare time and avoid the customer to come back after a while.

[@Beretta96Dan]

Thanks for the video, Alan. I have one of those Uniden President radios. I would love to know where you got the schematic diagram for the one you worked on. Thanks!

[@w2aew]

The friend that brought the radio to me to fix had a copy of the service manual. I don't know where he got it.

[@davecc0000]

Alan, especially enjoy your troubleshooting vids. What equip did you use to confirm the first out-of-spec cap? Cheers.

[@w2aew]

davecc0000 I simply used my Fluke DMM to check the resistance and capacitance.

[@mycatkramer]

Great Job ! I have several 2510`s and President Lincolns, both all are acting wonky..... Do you do mail in repairs ?

[@w2aew]

I'm sorry, I don't.

[@mycatkramer]

@@w2aew Sir I have 5 or 6 of them all with strange issues, related to age i`m sure.... Keep up the great work, 73 DE Bill

[@JAWS1376]

w2aew, thanks for the video. I do have a question about the tx button on the front panel. I just bought my first 2510 and everything is perfect except no tx. It had an older Astatic power mic included. (4pin) It looks like someone replaced the stock 5pin mic connector on the face plate with a 4pin. At first, I thought it was the mic/wiring because when I tried another microphone...as soon as I plugged it in the tx light comes on. when I release the ppt the tx goes off. (I know weird) Long story short...since I don't have a working mic, (yet) can I use the tx button just for troubleshooting? when I push the tx button I see the tx on the lcd but no AM/FM power on meter. thank you for any info!!!!!

[@w2aew]

Yes, you should be able to use the TX button to enable the transmitter, just like a PTT switch.

[@JAWS1376]

***** I begin my adventure tonight then lol can I get some of the parts at radio shack? or will I need to order online? thanks again for the reply.

[@JAWS1376]

***** Just want to say thanks again!!! This video and TRXBench's fixed my first HR2510!!!

[@radioboyable]

Thanks for the video I have one of these radio, tell see what happens when I look at it again thanks. Dewaine

[@abundantYOUniverse]

Do you still do repairs? I have the same radio and need it checked out. Thanks!

[@Teckroom103]

Excellent video. thinks for the demonstration.

[@eldenchang]

Great video, thanks. For those old instruments you can get the schematic. But what to do on a new instrument when the manufacturer does not give out the schematic. How would you find the problem then? Much harder and probably end up in the landfill.

[@w2aew]

Yes, this would be MUCH harder to do without the schematic and layout diagrams. It is common to simply blindly re-cap older equipment. That would've fixed this unit, but that's more of a brute force approach.

[@eldenchang]

***** Thanks so much for all these amazing videos. You are a great teacher. I am looking forward to many more videos from you.

[@Robalo844]

while you there i like to see alc adjustment on alc to max peek to seeit on the oscilloscope. wide open and closed to max peek tx.

[@StreuB1]

Thanks for the video, Alan! Your commentary on your though process regarding trouble shooting is VERY helpful! One question, is it possible and if do, very complicated. To take a 10m/11m radio and convert it to the 20m band?? N0BPS

[@w2aew]

+Brian Streufert Is it possible - maybe. Difficult? Most likely. You'd have to change at least of the local oscillator PLL's operating frequency, and rebuild any 10/11m band dependent filters (TX LPF), as well as likely having to tweak the frequency response of the RF front end.

[@StreuB1]

***** Figured. I saw a guy on YT that has done 20 & 40m conversions for the Uniden and another one (can't recall the brand) CB's.....so wasn't sure if would be harder or easier. Hard to answer I know but figured I would ask. Learning a LOT from your videos! :-)

[@berkmanyt]

How is the scope hooked up for testing ? Thank you walt K2CXP

[@w2aew]

The Bird wattmeter I used between the radio and the dummy load has an RF-sampler built in, so that is what is hooked up to the scope. Alternatively you can use any kind of RF tap or sampler. I did a video on these a while back: kzbin.info/www/bejne/ZnzOkIGVidV3m9E

[@jefffoster3557]

I have a Robyn 505 with the opposite problem. It stays keyed when you turn it on, regardless of mic on the radio or off. It does indeed transmit as I can hear it monitoring from another radio. I am not really interested in this radio but for the purpose of getting my feet wet in diagnosing and repairing. Shorted cap? I have 2 2510s. The one thing I would recommend to anyone is this....don't store them for years at a time. They need to be used to keep the caps formed and working.

[@w2aew]

It's possible. You'd have to work your way through the circuit to see where the keying line or function is being dragged to where it shouldn't. Might be as simple as a short near the mic connector.

[@tallbiker6758]

I have the chip switch in mine. Does anyone know how to install the priority board?

[@jonelberdejo9446]

Hey there I want to learn troubleshooting and repair by using schematic diagram instead of just messing around the circuit can you make a video for reading and understanding schematics thank you.

[@i8BBQ4Lunch]

Great video. Thanks for taking the time to record it. I see you have an analog scope. I would like to know how you connected it to get that sample. I just obtained a scope and I am still learning how it can be used. 73 ac7sr

[@w2aew]

i8BBQ4Lunch The Bird wattmeter that I used has a RF sampler built in. However, you can make your own sampler, buy one, etc. Here are a few ideas: Basics of RF Samplers, Sampling-Tees, RF-taps, etc. Simple Station Monitor for Ham Radio using an Oscilloscope

[@tallbiker6758]

Can anyone show me the schematic for installing the priority board?

[@Paulwe4]

I have a 2510 I just put on the bench with the same problem if another radio is on you can hear it in that radio but nothing on the meter

[@markrossi2326]

Great Video. I have one of these radios with no AM receive. ssb & fm work fine. any thoughts? Again, good job. thanks.

[@w2aew]

Not offhand. I gave the service docs back with the radio when I repaired it.

[@markrossi2326]

+w2aew Thanks for taking the time to reply. good video.

[@kalanicataluna7951]

So how is the problem when your transmitting but no mudulation when u talk Into the mic

[@w2aew]

Kalani Cataluna That's a different problem. Trace the audio signal from the mic, through the mic preamp and audio preamp, to the modulator.

[@Tobinindustrial]

Thanks for sharing!

[@themouas]

Enjoyed your video.

[@zepplinc20]

Love these "walk though" repairs. Keep up the good work. I especially like that you reference the block diagrams first, then schematic with description of circuits. -kg7eaz

[@w2aew]

Thank you. I try to do this with most of my repair videos, as well as the circuit walk-through videos.

[@alejandrotavolini1044]

hola tengo un equipo similar que cubria desde 27 a 33 mhz . lo deje un tiempo de usar y al encenderlo nuevamente solo cubre la banda de 10 m . nunca mas pude lograr que cubra la banda original saludos

[@garymurphy5352]

Can you repair my hr2510 also the same haw been storage awhile

[@w2aew]

I'm sorry, I don't do repairs except for my family and local/close friends.

[@shellyohara3739]

Trx lab did this same video a long time before this but I see this dude is doing the same video in the same way..how strange

[@w2aew]

I made this video in Oct 2014, and TRX Lab did his repair / troubleshootin video on the same problem in Nov 2014. Nothing strange going on.

[@HS0ZIQ]

I find these radios dont drive to well on SSB without some mods.

[@Justplast]

Very good job

[@steveb3885]

one bad cap, the rest are close behind, it should have been recommended to the owner to wholesale recap that radio with it's age.

[@w2aew]

That's what I recommended to him.

[@MrRichard57000]

lovely,very cool!!!

[@goradios21154]

Awesome

[@MrRoyzalis]

good work

[@samba3403]

nice fix.

[@JerryLTackett]

Nice!

[@armandoborges8150]

A professional trouble shooting

[@mackducharme6901]

Exactly what is going on with mine. It has been sitting on the shelf for the last couple of years