I have a chassis that unfortunately has the following problem: FM reception is good up to 93 MHz. From there, up to 100 MHz, all I can hear is noise. After that, reception simply stops. Unfortunately, I can't read circuit diagrams.
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Could it be that I just “shifted” the frequency band? So that the functioning 88-93MHz on the scale are actually 103-108MHz and from 108MHz there is nothing more to receive…
Are the transmitter frequencies in the working range? As is Station X also on the right frequency on the scale, or is that shifted?
Hello SetsunaKyoura!
The radio only goes up to 100MHz. At the UKW Tuner I tried to raise the reception on the bands from 93 onwards. That didn’t work. Up to 93MHz all receiving transmitters are in the right place. From 94MHz -100MHz nothing can be heard except a noise. 🙁 An antenna is also connected. It doesn’t matter. And I’ve already changed the tubes.
Enter search term “Intimo 5430” at google. Several forums discuss this problem and give advice.
LG H.
Hello cervical storm!
I already did. Only there are no reasonable solutions/answers. There’s no way to go. At a forum someone has exactly the same problem. There the reception is also away at the same place as with me. In the end, the problem is not solved. 🙁
This flat “kist” obviously has a few childhood illnesses that accumulate with increasing age. First, I would detect the oscillator frequency to determine whether the oscillator is above the reception frequency of 93 MHz. If this is the case, a repair will not be so easy. In any case, the variometer (inductive tuning) is one of the main causes for the failure of the receiver above 93 MHz.
LG H.
Perhaps the rotary capacitor, i.e. that part which rotates during the search for the transmitter, is dusty. Or too much dust in it. Diagnosis from a distance is difficult. Put a picture in.
Hello, CatsEyes!
I’ve set several photos. It is a chassis of a GDR radio Intimo 5430.
If it sets out at higher UKW frequencies, a replacement of the mixer ozillator could be the cause. The radio works according to the superhet principle, i.e. the antenna signal is mixed with it, so that an always constant intermediate frequency results. If the oscillator is set up, it’s no good noise. Maybe the Rotko is dusty or something.
Look for a part that looks like this: Commission Implementing Regulation (EU) No 680/2013 of the European Parliament and of the Council of 11 December 2013 laying down detailed rules for the application of Council Regulation (EC) No 1224/2009 of the European Parliament and of the Council on the common organisation of the market in milk and milk products (OJ L 347, 20.12.2013, p. 1).
Is it this device?
https://www.radiomuseum.org/r/funkmechan_intimo_5430.html#data
Hello, CatsEyes!
I just looked at the values of the loudspeaker I took all the time. It has an impedance of 4 OHM and 3 Watt. A loudspeaker with 6 OHM and 2 Watt is installed in the radio. And the loudspeaker connection also has 6 OHM. That’s too little. It’s a miracle that hasn’t passed my final stage. But currently I don’t have a loudspeaker for testing purposes other than this.
I assume that the volume is so quiet because the speaker has only 4 OHM instead of 6. The wattage is 1 watt higher (3 instead of 2 watts).
Hello, CatsEyes!
I measured the remnant on the version. He has 445-446KOHM. So there are 24-25KOHM missing. However, it will not be very easy to change because it is still soldered like a twisted V, and still connects a connection. I changed the cable. This took good 2 hours with preparations, and rework (clean).
The result: The EM84 is now almost all together except for a small gap. There’s nothing going on. I guess I’ll leave that. Or I soldered the 6 cables (2 blue, 2 red, 1 gray and 1 black) in the device, and bring the socket together with defective residue to a person skilled in the art. Where the six cables get, I’ve already noticed. That should not be the problem.
5% tolerance and 0.25Watt you can easily take as replacement.
The old resistance has 470KOHM, 20% tolerance and 0.125 Watt. I found one on eBay. But it has other values except for the 470KOHM. He has only 5% tolerance and 0.250watt. Now I don’t know if I can take it because of the double wattage, the revolt on the base should be defective. But it is only the cable that has not yet been killed, which leads to the resurrection. I’d have to change that completely.
Hello, CatsEyes!
I have just read in a forum that could also be attributable to the failure of the EM84 tuning tube, which is not collapsing, to the resistance of the tube mount. Someone had exactly the same problem, and did not consider the revolt on the tube base. After changing, the tube went. But not so far.
Let’s see if I’m still doing this job. With such a revolt in such an impossible place, I really don’t want to braz. 🙁 This was no fun 3 soldering points where 4 cables are soldered. I almost got crazy.
Hello, CatsEyes!
Thanks for the tips!
To 1.) The pointer should be in place, otherwise he goes over the reels, depending on whether he sits too far left or right. I always put the UKW transmitters on this radio at the VHF tuner. That’s good.
I’ve done this a lot of success.
2.) I think that with the volume. That’s why I wrote that after I killed the originals, the volume should work properly again.
3. I changed all the capacitors. This is not possible. The EM84 also went out due to old soldering points at the mount. I have now killed them with a lot of effort. A cable also went off when I wanted to solder it out of the soldered eye of the socket in order to decorate it again.
to 1.) Move the pointer on the rope.
2.) The volume also depends on the ohm number of the speaker, perhaps the external speaker has a higher ohm number.
3.) Look at the capacitors around the EM84 “good”, maybe the tube just doesn’t get an input signal.
Well, whatever, a lot of success!
Hello, CatsEyes!
There are three problems:
1. Bring the transmitters in the right place.
2.) Increase the volume with the original speaker.
In the case of the jack, it’s like you’ve only set on a leak, and that with a regulator stop. But that’s not the same for all stations.
3. The EM84 (voice tube/magic eye) does not move at all. She stays together. Whatever I do. The partial failure was due to bad solder connections at the tube base of the EM84. I fixed it. It wasn’t very easy. I don’t think I’m gonna get that anymore. I can live with that.
Hello, CatsEyes!
From Sunday until today, I took the chassis from the GDR Radio Intimo 5430. On Thursday I changed the UKW Tuner. Now the reception is back all over Scala. But I have to make an exact balance. But that’s not until I have a scale hand that I have to install. And since I can only connect one speaker at the back, the volume is not very loud, despite the regulator stop. Let’s see if this changes when I solder the original speaker.
Hello, CatsEyes!
I’ve gotten to the chassis again. The result is unfortunately unchanged. Now the tuning tube EM84 does not always shine. She didn’t go apart before. Now she’s finally out. When I removed you, and only so loosely held on the cables, she went on and out. The same also makes it in the built-in state when you wobble on the cable harness. There is no contact. It doesn’t change at the reception.
Hello, CatsEyes!
I can do that. But have another GDR radio (Rema Solo234) on the wind, which does not play at all. I’ll get it tomorrow. Since the light flickers at the station on VHF, and it is nothing but nothing to receive. Changed all 6 old white capacitors (so-called snowmen). And also the board with the heights, depths and volume controls. I’ve removed them from a working one, and from the defect in the other. The working one went with this one, and the other did not work with the others. I’m always very stubborn.
PS: And if it doesn’t, I still have spare parts. I’d rather play them. Let’s see.
May your success overwhelm my pessimism! Can you let me know if you got it? Beautiful Easter!
Hello, CatsEyes!
So I’ll get that on balance. I’ve changed an air trimmer in 2 hours. It takes 2-3 hours, but it would have to be received from 94MHz until I get the transmitters back exactly where they should be. The reception is currently only available from 88-93MHz. From 94-100MHz nothing is to be received. You’ll get me back next week.
Changing air trimmer also requires a subsequent adjustment, which becomes very difficult to impossible without measuring instruments. Trimmer doesn’t mean that for free…
So’n rope can be replaced with good twist.
Without any measurement possibilities, you will almost have no chance to match trimmers, coils, to synchronism across the entire frequency range.
Hello, CatsEyes!
I’ve been thinking about the whole tuner for a long time. Only I’m afraid that the scale rope will jump off or travel. If it’s going, I’d have to get a new one, because I don’t have one. However, it may also be possible for the air trimmer which sits between the 2 screws to the right of the tube in the middle. It’s not easy to change. I’ve only done this 1x. Duration: 2h:(I can try to adjust, but will certainly not bring much.
After such a change it would have to be re-adjusted, there are two coils if I see the circuit diagram correctly. They are mechanically coupled. It can be that the inductances no longer change in parallel in the same way during the search run. If that’s it, you won’t get clear without measuring equipment.
There are a lot of repair cafes that have more possibilities, if there is someone who knows something about it.
Hello, CatsEyes!
I’ve guessed that, too, and I’ve been careful. At first, a thread was broken from the UKW Tuner at the top, and then a diver did not dive deep enough. After I exchanged this part, everything reappeared, but that remained with the missing reception from 94MHz. It dives everything, but the reception from 94MHz is not there.
That’s right. Look what’s going on when you turn the transmitter search button, so a coil core would have to move in and out of a coil. Is that without hooking or something?
Hello, CatsEyes!
The UKW Tuner can be seen on the upper photo from above.
The Rotko is not the right one. It is a GDR radio Intimo 5430 with a tube tuner, and a tube ECC85.
Just saw in the circuit diagram that the radio has no deh capacitor, but rather a variable coil system.
Hello, CatsEyes!
That’s exactly this radio.