#176 

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!

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

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.

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..

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

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.

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.

Logical step by step troubleshooting.

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

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

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 RU-vid also for helping preserve an almost forgotten line of technicians who believed in repairing---not replacing! T. Dexter, Blue Hippo CB Shop, Alabama

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

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,

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.

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!

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

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.

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

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!

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

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!

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.

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.

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.

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

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.

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.

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

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.

Very helpful troubleshooting lesson! Thank you for the video!

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

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

great job presenting the repair Mike, thank you again!

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

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

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

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

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

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

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

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.

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

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

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

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.

Good video thanks for the info

Nice run through, Thank you always interesting.

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

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

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

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

Enjoyed your video.

Excellent video. thinks for the demonstration.

Impeccable explanation, thank you very much!

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

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

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.

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

Very good job

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?

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

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.

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.

Thanks for sharing!

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

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

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.

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

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

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.

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!

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.

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

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, 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!!!!!

lovely,very cool!!!

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

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

I have a question. my uncle gave me his 2510 . it has exactly same issue. do you fix radios ? i want to pay someone to fix up mine.

good work

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

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

nice fix.

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

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

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

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

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

Nice!

Awesome

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

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

A professional trouble shooting