Nice troubleshooting and repair Peter. Cannot count the times I have seen similar issues. Thanks for the video.
@TRXLab
Жыл бұрын
Thanks my friend! Yeah you are right, we find to many of those issues.
@bblod4896
Жыл бұрын
With those steam powered radios? 😂 Have a peaceful Sunday.
@capt.mike73ahoy14
Жыл бұрын
Good video Peter; I knew that relay in the line hanging out in mid air would drive you crazy!
@KF7PCL
Жыл бұрын
It is pretty strange. Also a very atypical relay package
@TRXLab
Жыл бұрын
true
@n5yiz
Жыл бұрын
The 13.8v from that ACC port has always seemed a little dangerous to me. I think best to use the SEND from the phono out and use a separate, fused 13.8v tapped from the main input from now on. As shown, a lot of work if something goes wrong. Thanks for the great video.
@snakezdewiggle6084
Жыл бұрын
But the problem was the User ! Its a bad tradesman who blames his tools. Read a book... ;)
@KF7PCL
Жыл бұрын
Personally I also used the phono jack (seems way more convenient) but powered the relay off a 9V battery so it is totally isolated from the power system. The current draw is so low, I haven't needed to replace it yet after months of operation
@TRXLab
Жыл бұрын
yes it is a bit tricky
@ethanpoole3443
Жыл бұрын
I don’t understand why the Big 3 (at least) manufacturers don’t all incorporate a polyswitch (PTC thermistor basically) onto all the power out pins such that an overload is well protected against without causing any damage (they could easily have used a ~1A polyswitch here and there would have been plenty of power for even a good sized relay coil). To myself that is far better than burning out traces and components and they cost so little relative to the cost of a respectable HF radio (and especially sending out for repair). I know Yeasu radios often have a similar setup to this iCom and warn in the manual that a short, or too much accessory current, can damage the radio. This is also why I always thoroughly test all cables I make before first use and also make liberal use of heatshrink tubing (much like Peter) wherever possible to protect against shorting from frayed wires or a damaged connector (or just a bad soldering job, as seen here). Thank you so much for another great video, Peter!
@snakezdewiggle6084
Жыл бұрын
Good job on the pcb traces. Not an easy fix, but you got it 👍 Great video, thank you. ;)
@stevenmandell3385
4 ай бұрын
Well done my friend
@stevenmandell3385
4 ай бұрын
WB4DVH
@hitechredneck6366
Жыл бұрын
What's the current draw on the relay supply? Might be a good idea for the customer to add an inline fuse that will prevent the choke as acting as the fuse. 🙂
@davidhollfelder9940
Жыл бұрын
It is well known, that the PTT “pull to ground” circuit in these modern solid state radios is weak, as it can handle only very low amperage. The solution is to use an external relay box, such as the Ameritron ARB-704.
@TRXLab
Жыл бұрын
Correct
@stargazer7644
Жыл бұрын
Which is the same as the external relay shown in this very video. That's why it is there.
@WN8HGZ
Жыл бұрын
well done de wb8idy
@super-8
Жыл бұрын
Smoking cable manu-facturing
@TRXLab
Жыл бұрын
LOL yes
@richardmelville5973
Жыл бұрын
Great repair. I think the relay should be re-soldered and heat shrink applied to the terminals. That thing is an accident waiting to happen!
@stargazer7644
Жыл бұрын
I would just slip the whole thing into a large piece of heat shrink.
@montygore1200
Жыл бұрын
Hi Peter. as you know that is a dangerous circuit for the radio. For my customers I have a circuit using a optocoupler to send the amp into transmit I also put the circuit internal on older amps I repair in my shop. Thanks for the new video. You are my favorite youtube tech. Always glad to see a new video. Your videos are always pleasant to watch and informative.
@stargazer7644
Жыл бұрын
Why would you say using a relay to key the amp is more dangerous than an optocoupler?
@montygore1200
Жыл бұрын
Hi. To reply to your question as why not use a relay is basically 3 things. One would be the diode shorting 2 would be the relay could short and 3 the relay when the field around coil of the relay can discharge many more volts as the field collapses. Thanks for asking.
@stargazer7644
Жыл бұрын
@@montygore1200 Your optocoupler is just as likely to short as the relay or the diode. And the purpose of the diode is to snub the voltage spike from the collapsing field.
@rscelectrical7091
Жыл бұрын
Another excellent diagnosis and repair Peter, thank you for taking the time to film it.
@TRXLab
Жыл бұрын
Thanks
@IZ0MTW
Жыл бұрын
Excelent investigation, root cause finding and repairing, as always. And as always thanks for sharing! Diego
@TRXLab
Жыл бұрын
Thanks Diego
@riccardosanti3381
Жыл бұрын
Great, Great, Great. Rick
@Spookieham
Жыл бұрын
I made the same arrangement for my 7300 but everything us secured and lives in a little plastic box and was tested BEFORE I plugged it in. It's an expensive radio to damage.
@bblod4896
Жыл бұрын
31:46 carbon, the building blocks of life or, in this case, partial death. Dr. Peter will perform his magic on this poor radio.
Жыл бұрын
There is a separate SEND jack next to the ALC jack specifically for amplifier purpose! Why the owner uses the ACC connector is beyond me...
@TRXLab
Жыл бұрын
Correct
@stargazer7644
Жыл бұрын
You can't connect that jack directly to a tube amp either - you have to use a relay. You need +12v to run the relay, and that's on the ACC connector. Now does it make sense?
@Spookieham
Жыл бұрын
@@stargazer7644 exactly what I've done on mine to drive a tube amp. Plenty of videos showing how much voltage can be across the amp PTT terminals.
@Bass.Player
Жыл бұрын
What is the point of using an inline relay without a secondary power source to carry the load?
@jackofalltrades3727
Жыл бұрын
Thanks for all your hard work , I enjoy all of your videos
@TRXLab
Жыл бұрын
Thank you Jack
@hancecrawford
Жыл бұрын
Hi peter people want to carry out modifications they should bring it to someone like you as you know what you are doing little knowledge is dangerous
@DonDegidio
Жыл бұрын
Hi Peter, Nice job finding all the problems, especially the short at the male connector. Glad that circuit board trace was not so damaged you could not replace that component. Stay safe. 73 WJ3U
@TRXLab
Жыл бұрын
Thank you, Don!
@ptronix
Жыл бұрын
Dodgy wiring by people who should leave it to someone more capable. That relay should of course be in a nice little box, thanks Peter
@TRXLab
Жыл бұрын
yepp a littel box would be perect.
@w.rustylane5650
Жыл бұрын
Once again, a great video, Peter. I didn't realize that hooking up an external linear amplifier would involve so many components. Cheers from eastern TN
@TRXLab
Жыл бұрын
You would only need those stuff if you have a very old PA with higher voltage on the relay line...
@MicheIIePucca
Жыл бұрын
The copper ground sheath conducts heat so well, in these cases I always use a small aluminum heat sink on the ground strands so the heat doesn't melt the center wire.
@georgebodley8068
Жыл бұрын
Very poor soldering that burnt and shorting wire Lack of care when soldering .another excellent repair video well done .
@David-f3g8h
Ай бұрын
hi I have a ICOM 7300 when I press the mic button or the transmit button and water fall freezes can you help thank you very much love watching your programme its very informative thank again
@2metercrew389
Жыл бұрын
👍👍👍
@aslerunarborgersen5175
Жыл бұрын
Thank you for another interesting video, Peter. I am sure this kind of short circuit is very familiar to those of us who tried to solder the old five or six pins DIN plugs that were used on older stereo equipment. We mostly had big, clumsy soldering irons, and no microscope :) 73
@snakezdewiggle6084
Жыл бұрын
And microphone plugs / sockets on radios in the 70's and 80's. ;)
@TRXLab
Жыл бұрын
yes it is more or less the same plug as the old DIN plugs...
@dondonaldson1684
7 ай бұрын
What is mind boggling is the fact that a ham authorized to run a PA at 1kW didn't check his soldering with a DMM. If he doesn't have a DMM, he has no business picking up a soldering iron. "DIY" in this case is "destroy it yourself".
@hectorpascal
Жыл бұрын
Anybody who has problems hand soldering SMD's should watch and learn from Peter's ideal technique shown @42:10 onwards. The key is all in the timing! To inspect home made DIN style connectors, I always use a x8 watchmaker's eye loupe. In addition, I fully agree with others that optocoupling higher voltage external circuits to transceivers via a small box, is really the safest method.
@TRXLab
Жыл бұрын
Thanks, Hector
@montygore1200
Жыл бұрын
Wow I need to wait until the vieo is over to comment. Shorted at the coil after all
@TRXLab
Жыл бұрын
all fine
@montygore1200
Жыл бұрын
Sorry I got a little ahead of my self. I really thought the problem would have been a shorted diode or relay coil.
@TRXLab
Жыл бұрын
No worries
@daveengstrom9250
4 ай бұрын
When I was a kid in school., my electronics teacher told us that electricity was made of smoke. When the smoke gets out of the wire, it doesn't work any longer. 😁
@notfallmed
Жыл бұрын
TNX Peter, and happy Weekend from Peter. 73
@fredshead3956
Жыл бұрын
Yes indeed handy trick is to read manuel, and it says, its ok to use a non Icom Linear like the Ameratron 811H which i have, straight from the PTT socket, as that provides 0.5 amp and 16v, and the linear leeds 12v and 100mA, so should work, as for the Accesorie socket, you should only use an Icom amp from that socket as it provides verry little current, there is a special lead you can get for that, so i assume from that, that the Icom amplifier has a built in triggering mechanism, so as not to damage the radio, the PTT socket next to the ALC socket i am told by areliable soures comes from a relay inside the radio, whether that is a mechanical relay or a solid state relay i have no idea, i was also told if you use ssb only it works with no problem if you use carrier modes you should set the timer in the radio menu to 50mS delay...i have been using the radio and amp like that for several years and had no problems, i have never tried using the Acc socket for anything so Peters circuit diagram i dont think has anything to do with the PTT socket, only the Acc socket, so it appears to me the owner of the radio probably plugged a non Icom amplifier into the Acc socket.....from Fred g4vvq.
@Alberto_Alletto
Жыл бұрын
Excellent video and excellent images! what camera do you use?
@TRXLab
Жыл бұрын
a very basic Sony with Zeiss lens
@Alberto_Alletto
Жыл бұрын
@@TRXLab many tnx !
@lebrongmarlong5400
6 ай бұрын
Hi Peter, excellent video. I would like to know how I can communicate with you. 73
@LA9RKA
Жыл бұрын
Yet a another educational repair video, thank you very much Peter for taking the time to make this video.
@robertbobbitt8448
11 ай бұрын
Do the man a favor and rebuild that cable properly That things an accident waiting to happen Most of the joints looked cold
@WN8HGZ
Жыл бұрын
thanks for going back and fourth with the schematic it really helps
@TRXLab
Жыл бұрын
Glad that you liked it...
@EA8CVZ
Жыл бұрын
Gracias por el bonito vídeo. Un like para ti.....👍
@michaeltietzyou
Жыл бұрын
Moin, sehr schön ! Wenn ich mir die Lötstellen und das Gesamtbild des Steuerkabels, schon zu Beginn ansehe, bekomme ich Gänsehaut.
@RGB06084
Жыл бұрын
Great work Professor!
@littlebear5219
11 ай бұрын
Nice repair , which show what can happen if you don’t take care when you fit the plug
@mikefinn2101
Жыл бұрын
Peter you really are the most informative and knowledgeable person on You Tube. You are number one by far The best of the Best. You do a great service to all us Ham Radio Operators who might one day face the same issue. A real pleasure watching you even though a week late. Sorry for being a week late. Always look forward from new videos from you my friend. can't ever thank you enough you're too kind. God Bless you richly best 73s Mike
@TRXLab
Жыл бұрын
Thank you very much appreciated !
@wayneambrose3234
5 ай бұрын
Peter I’m just wondering do you have anything that you’ve shot on video about alc on the 7300 I had a radio that was either hit by lightning or took a power surge I replaced a whole bunch of stuff to bring the receiver back to life and when I got that done it was working the I had Alc I had power up put everything else and then all of a sudden one day my ALC just disappeared to nothing and I don’t know what’s going on except I got checking things out and one of my antenna connecter pl259 came undone from a G5 RV and I have no antenna on it so I’m curious if I’m gonna have to check I into the final transistors or check into the drive transistors maybe you can if you’ve got a video like that try to let me figure out how to get the alc back love your videos. ❤❤❤
@TRXLab
5 ай бұрын
Not on the IC7300, but ALC circuits are more or less the same. You may get some insights if you watch video #94
@truthfilterforyoutube8218
11 ай бұрын
Let me guess.... he was using an " Older school" power amp !
@TRXLab
11 ай бұрын
nope
@batman4e
Жыл бұрын
The fuse should not be replaced before finding the cause of the fault. I think the owner replaced the fuse until the trace was burnt. Also it is not good to power on units with replaced fuse before finding the fault. You should have inspected first the inside of the radio.
@aussiedazvk4djh889
Жыл бұрын
G'day Peter. Another great video 👍
@SkyWire88
Жыл бұрын
Very nice video as well as fine trouble-shooting. Your customers should be required to view the video that corresponds to their repair for best understanding of the situation. Thank you.
@TRXLab
Жыл бұрын
Most of the time they watch :-)
@jerrypeal653
4 ай бұрын
Another fine job.
@rjy8960
Жыл бұрын
I had to build a PTT cable for my Lab599 TX-500 which uses a GX-12 connector which also carries audio. I was REALLY nervous about this exact problem so as I'm not using that connector in this application for anything else, I decided to physically remove all of the unused pins from the GX-12 plug leaving only the GND and open collector PTT switching lines, so there is physically no way that 12V from the linear can accidentally appear on any of the other signal lines. Nice work, Peter, BTW! :)
@marksantana4150
Жыл бұрын
ABSOLUTELY GREAT VIDEO!!! Truly. I have learned more in your videos than hours and hours odf classes. Great t work. Thank You!
@silvanomoreno6950
Жыл бұрын
Hello Peter, thanks for sharing this new video, its very pleasure to watch it. 73 I1WSM Silvano
@susanlodges48
Жыл бұрын
I suggest that you look at an inductor blown.
@TRXLab
Жыл бұрын
well I have done that ??
@mscir
Жыл бұрын
Great video, well done, it's a real pleasure watching you work, thank you for being so thorough.
@rogerlaw8881
Жыл бұрын
Thanks for another great video, Peter! I have a 7300 so the video could come in handy sometime in the future. By the way what temperature do you set your reflow blower to?
@robertrainey1728
Жыл бұрын
loved watching the repair. Not sure I understand the diagnosis so would need to watch a few times.
@tomnorman5461
Жыл бұрын
Another fine job Peter! Those connections on that external relay need to be insulated so that 13.8vdc connection never comes in contact with the radio chassis, or it will get damaged again.
@jimwolsiffer4397
Жыл бұрын
Great work Peter. I can't help but wonder, the value of the internal fuse? Guessing as it looks like 1 amp (yelllow)?. It makes me think the orginal fuse blew and then a higher value one was inserted ( perhaps another 1 amp blew as well...). Anyway that damage looks like a lot of current passed. On the close up of the strands shorting they look overheated at the point they penetrated the red wire. Now tell the truth, did you fix that relay wiring before you sent this back...hi hi.😅
@KF7PCL
Жыл бұрын
If available, it might be wise to put a smaller fuse in
@TRXLab
Жыл бұрын
The fuse is 5 A
@jimwolsiffer4397
Жыл бұрын
@@TRXLab I would use a 1 instead. 5 amps is a bit much. That choke youbreplaced, what rating does it have? Even a 1/2 amp would be enough and future failsafe that repair. Always look forward to your lessons! I did grab that screwdriver set you reviewed, had been looking at them for a while but couldn't decide....
@stargazer7644
Жыл бұрын
That is supposed to be a 5A fuse.
@konradkubit6525
Жыл бұрын
Great repair and investigation Peter as always 73
@regularuser492
Жыл бұрын
Unsere radiowellen Arzt is wieder am werk ! Danke Peter fuer diese lehr stunde.
@PapasDino
Жыл бұрын
It appeared that a couple of the ground wire strands may have begun to migrate into the white insulation and the wire leading to one of the powered leads in your redone ACC connector; may have just been the way I was looking at it on my monitor. Nice fix Peter! 73 - Dino KLØS
@TRXLab
Жыл бұрын
Hi Dino, all correct so far, but it was a red insulation. Thanks for stepping by.
@stargazer7644
Жыл бұрын
The white insulation was the ground wire on pin 2.
@PapasDino
Жыл бұрын
@@stargazer7644 Yeah, I caught that when I want back and looked again, thanks.
@charliem.9998
Жыл бұрын
yet another great video by Peter & Olaf :-) best 73s de DL6RDE / AA1KD, Charlie
@TRXLab
Жыл бұрын
Danke Charlie
@fredshead3956
Жыл бұрын
Hi Peter, i use mine with an Ameritron 811HX 800 watt amplifier, all i do is plug the PTT line into the PTT socket on the iC 7300, i've never had a problem, i have never used the remote socket, i think the 7300 has a bilit in relay to handle the load, but you could always use an external relay box....Fred g4vvq.
@KF7PCL
Жыл бұрын
I believe the connections function identically but the keying voltage of that amp is 12V @ 100mA which should be tolerable for the rig. Many older amps had keying voltages anywhere from 20VDC (sometimes negative) up to the AC line(!), or relays without flyback diodes.
@TRXLab
Жыл бұрын
perfect
@stargazer7644
Жыл бұрын
The 7300 absolutely does NOT have a built in relay. You saw in this very video what the circuit is. If you apply a voltage or current above what that switching transistor will handle, it'll blow it.
@fredshead3956
Жыл бұрын
@@stargazer7644 Ok Well the bottom line is if you use the PTT output socket it will key most amplifiers without any added circuitry, but if it doesnt then use and external relay and trigger that from ptt line...simple enough,...thats what i do, never had a problem
@stargazer7644
Жыл бұрын
@@fredshead3956 The PTT output socket WILL NOT safely key any older amplifier with a high voltage PTT circuit or one that requires more than a couple hundred milliamps of current. That's the entire point of using the relay. So far you've been lucky enough not to have plugged your radio into one of these amplifiers. One day you'll smoke an expensive radio. Read the manual.
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