Hi Manuel. I've watched your series on the 3400 with great interest. I obtained one of these radios from ebay bout a year ago, sold in non working order. Still paid a tidy sum for it though. I eventually started work on it about 10 months ago, and the first issue, no mains power, was traced to a faulty bridge rectifier. As the power board needs to be completely removed to allow access, I also tested and replaced any dodgy electrolytics, including the two tants, which were completely open. After reassembling, the radio then powered up, but only FM gave any signs of life. I then shelved the radio for working on another day, mainly due to my lack of understanding of the radios operation and circuitry. (Your schematic analysis video solved that for me). Then along came your excellent series of repair and adjustment videos, and re ignited my interest in fixing my radio. As a result I checked the switches on the bandspread board, all high ohms, and checked the tants on both the B/S, FM and SSB controls board. Every tant was high ESR or totally open. I also made the decision to check every switch on all boards, not just the band spread panel. Every single switch was hi ohms or intermittent. Given your superb description of the switches I've now desoldered and dismantled all of them, (not an easy task given the multiple boards involved), and I'm now in process of cleaning the switches. Also worthy of note, I did try spraying the switches with deoxit while both assembled and disassembled, but for the first time ever in my experience, deoxit made little or no improvement!! Whatever happens to these switches is unlike anything I've seen in the past. Anyway, sorry for the long ramble, but I needed to thank you for your excellent videos, and for giving me the spark I needed to return to my attempted repair. Keep up the great work... Cheers Bob..
@electronicsoldandnew
2 жыл бұрын
Thanks for your message. I really like to hear that one or more of my videos has helped someone. It gives me even more incentive to continue to show my projects on the channel. Enjoy your project.
@ukrainehamradio
3 жыл бұрын
It's incredible that you drew the blueprint for the switch on purpose! Dirty switches are often a pain (
@electronicsoldandnew
3 жыл бұрын
it’s all part of the fun of the hobby.
@DavidTipton101
3 жыл бұрын
This is coming along nicely Manuel, you are overcoming each hurdle one at a time. The FM will be interesting.
@electronicsoldandnew
3 жыл бұрын
It will be. I’m leaving that for last (like saving the best chocolate in a selection box 😊
@dl7majstefan753
3 жыл бұрын
Manuel, glad to see, that you cured this switch. The problem is, that the sliding contact has a rather weak mechanical pressure. So it can´t clean itself from tarnish and should be moved from time to time.
@electronicsoldandnew
3 жыл бұрын
Makes sense. Hope you didn’t mind me mentioning your name 😊 It was exactly what you predicted.
@dl7majstefan753
3 жыл бұрын
@@electronicsoldandnew Mentioning me by you is like an accolade
@electronicsoldandnew
3 жыл бұрын
😊
@rodsradios
3 жыл бұрын
Greetings from Ireland, - Your explanation of the switch arrangement was a revelation, thank you for the simulation. It will help me greatly with my current 2400 challenge.
@electronicsoldandnew
3 жыл бұрын
My pleasure, Rod. Good luck.
@erikdenhouter
3 жыл бұрын
For the switch contacts, I use paper and some copper of silver polish. After that paper with a cleaning substance like alcohol. I don't ever measure: when one acts up, de-solder every one of them, and get on with it. BUT... I see there are a lot of them. I have often done the record/playback switches of tape- or cassette recorders, about three times the length of these you have. Mostly they were black oxidised on last contact set, there where the atmosphere can get in easiest. So maybe closing down every hole around could be beneficial.
@electronicsoldandnew
3 жыл бұрын
👍
@sanjaykarambelkar2665
3 жыл бұрын
regarding switch animation, you're innovative and go extra mile in helping your viewers. Excellent teaching and that way it generates more curiosity .
@electronicsoldandnew
3 жыл бұрын
thanks
@jdmccorful
3 жыл бұрын
Interesting switch contact layout and operation. Brick by brick you climb through. Thanks for the look.
@electronicsoldandnew
3 жыл бұрын
pleasure
@SteveThinman
3 жыл бұрын
Thanks for the fantastic explanation of that switch! 👍 I never had thought it is that complicated (and ingenious at the same time).
@electronicsoldandnew
3 жыл бұрын
pleasure
@howardhiggins9641
3 жыл бұрын
I agree with Dirk K, your switch animation is excellent. Slide switches seem to be so simple, and yet they can be so unpredictable. Even after you clean them they are sometimes dead the very next day. Some are so tightly sealed. I wonder how far the cleaner gets into them - I'm thinking the dirt can't escape in the switch cases. I hate the thought of doing it on a piece of test test gear that I have, but I think I will have to manually drill upper ans lower access holes in its several ganged switches. I'm afraid to do it with a powered tool, as the switched are un-obtainium.
@electronicsoldandnew
3 жыл бұрын
In this one I think the contact cleaner couldn’t even get in. I feel your fear about drilling your switched 😊
@Mikexception
3 жыл бұрын
That is something I wasn't expecting as it affects only AM, not FM bands . In fact I had to do exactly same work in my 3400. Tricky. I think Grundig used some conservation on contacts which gave up. Tried first to get over it but after 2-3 times spraying it was still back. It is very pleasant model for servicing and it's paying back for attention ( which it demands after so long years with no mercy:)). I've had already Pancrusider when decided to buy 3400 expecting that one for the reason to bit the first one. Also got one with many small defects. Unfortunately I was wrong- with notice that I had to make full alignment of all circuits in Pancrusader (which wasn't so crying in 3400, only BFO circuits ) and with strong city radio interference they receive equal , may be if I try it somewhere in the country because it comes from mains electricity cabling ?. At FM 3400 receives really far from
@electronicsoldandnew
3 жыл бұрын
👍
@alancordwell9759
3 жыл бұрын
Love the 3D modelling! Really clear to see how it works.
@electronicsoldandnew
3 жыл бұрын
Just me playing around 😊
@ronnyverminck2741
3 жыл бұрын
Nice work. Problem for the FM could be the demodulator IC. I checked my demodulator and it works fine, only the TR between the tuning and the demodulator can be dead (hence my tuning problem ive mentioned in the previous vid. )
@electronicsoldandnew
3 жыл бұрын
👍
@retro1970style
3 жыл бұрын
A very interesting and informative video as always. I have one of these I picked up years ago and its on my things to do list. I have been following this series with interest. I have never tried myself (so far) but would welcome comments from yourself and other subscribers as to whether an ultrasonic cleaner bath would have been suitable for cleaning the switch without the need for disassembly. Some switches of course are not so easily disassembled. I realise that careful drying would be required (hair dryer) any lubrication would need to be reapplied afterwards. Good luck with the restoration. John
@electronicsoldandnew
3 жыл бұрын
I’m not sure the liquid would actually get into this one. If you do use an US cleaner, and then soak it in isopropyl for a while, I think it could be fine. If the liquid does get in, then so will the ipa.
@bobford100
2 жыл бұрын
Hi again.... One more warning for anyone working on one of these.. There appear to be three slightly dimensionally different versions of the 'clip on switch levers' fitted in these radios. Basic error on my part, removing all the switches at the same time to clean. Now I've got to fit the correct lever to the correct switch. Doh..... Cheers Bob
@electronicsoldandnew
2 жыл бұрын
Yes, I caught that in time 😊
@dirkk792
3 жыл бұрын
WOW!!! Your 3D animation of the switch is so cool !! How long did it take to make this ( if i should have to make such a 3D drawing it would take me days to make it ! Great job!
@electronicsoldandnew
3 жыл бұрын
About 10 minutes, really. I use Sketchup which is really simple and fast.
@retro_tech
3 жыл бұрын
Great to see this progress! Looking forward for the next videos. When I clean switches (either manually or with contact cleaner), I spray them afterwards with Kontakt 61 spray, which should act as a lubricant and protects against corrosion.
@electronicsoldandnew
3 жыл бұрын
👍
@mackfisher4487
3 жыл бұрын
Good job, I find it a little scary taking apart weird switches to gain access because you know you can never get a replacement. Wafer switches are my favorites.
@electronicsoldandnew
3 жыл бұрын
I agree. Always expect something to spring out and get lost across the room 😊
@user-jz6qg5pp1q
Жыл бұрын
Respect 🎉
@electronicsoldandnew
Жыл бұрын
👍
@edwardhannigan6324
3 жыл бұрын
That switch was a bit of a pest, you need a hell of a lot of patience to figure it all out..Nice video and repairs..Ed..uk..😀
@electronicsoldandnew
3 жыл бұрын
thanks
@paulbennell3313
3 жыл бұрын
A large section of the radio dealt with in one repair! The other problems are probably of a similar nature, I don't expect much or anything in the way of component failures.
@electronicsoldandnew
3 жыл бұрын
You never know … It’s always more fun when the problem is challenging. I’m a sucker for punishment 😊
@paulbennell3313
3 жыл бұрын
@@electronicsoldandnew Yeah, I get that but there's also a certain satisfaction in solving several problems in one go. Or in my case, "This had better work otherwise I'm stumped!"
@electronicsoldandnew
3 жыл бұрын
😊
@johnnewham2235
3 жыл бұрын
Thanks for the great video, I have a Grundig Satellit 300, the radio has only one fault, the digital display has stopped working, wonder if it's the switch needs cleaning
@electronicsoldandnew
3 жыл бұрын
That or the supply. Happened to me before and it was a supply problem.
@johnnewham2235
3 жыл бұрын
@@electronicsoldandnew Thanks for the info
@PatrickClutch
3 жыл бұрын
I can't wait to compare the receiving with the 2100. Maybe You can use signal generator and switching attenuator to do this?
@electronicsoldandnew
3 жыл бұрын
I probably will try something like that at the end. Good idea.
@rádiosantigos1958
3 жыл бұрын
Congrats for the solution that you have found. Do you think that the switch that you have just worked on could be a case of "over-engineering"? Because, it does not looks like that it performs a important function, I guess.
@electronicsoldandnew
3 жыл бұрын
Not sure. I guess it’s a simple DPDT times 2.
@rádiosantigos1958
3 жыл бұрын
I was meaning over-engineering from the part of the Grundig people. The German engineers have a kind of fame for that. 😉
@electronicsoldandnew
3 жыл бұрын
👍
@Mikexception
3 жыл бұрын
@@rádiosantigos1958 That I agree too - this switch in fact is pulling attention of new-buyer for three selectivity choices for which I was attracted too. In my experience this could be done with double selectivity switchable filter with additional inductance coupling plus existing quartz - very simple idea But it would require to make such unusual today filter and this I think they wanted to avoid due to it's tricky alignment So they ended up with this 10 pins and RC filtering. .
@StillCloser
3 жыл бұрын
I don't know what's the problems with your videos, but they never play in the laptop or PC the first time I try to play them, all I got is the buffering circle... I have to pull out the cellphone, play a few seconds there and refresh the page on the laptop... I suspect KZitem encodes the videos first for cellphones...
@electronicsoldandnew
3 жыл бұрын
I only publish after YT informs me that the processing is complete, so I can’t answer that, I’m afraid. Anyone else having the same issue?
@rádiosantigos1958
3 жыл бұрын
@@electronicsoldandnew In the last video before this one, I had the same problem on my laptop. I think that YT had some problem.
@electronicsoldandnew
3 жыл бұрын
👍
@DAVIDGREGORYKERR
3 жыл бұрын
I don't understand why they didn't use diode switching and get rid of the switches.
@electronicsoldandnew
3 жыл бұрын
Must’ve had their reasons. Those guys were great engineers.
@DAVIDGREGORYKERR
3 жыл бұрын
@@electronicsoldandnew You should see the radios coming out of the United States.
@ciprianpopa1503
3 жыл бұрын
@@DAVIDGREGORYKERR could you give an example
@Mikexception
3 жыл бұрын
. Switches are good enough if made with long experience and not over-engineered like this. May be also there was on contacts any conservation agent which was bad idea for reliability . I use also Pancrusader SW/FM radio which is japan design and all it's ( some very complicated) switches were only sprayed by me and work 10 years since with no cracks.
@ciprianpopa1503
3 жыл бұрын
@@Mikexception one thing is to design a radio and another is to design and choose the right materials to make a switch. Here we talk of a poor choice of metals to make the contacts.
Пікірлер: 66