Dereck,

What are you using as a controller? Was there anything that happened just before it stopped working?
If you disconnect the speaker from the PC board, you can test to see whether it is still working.

I was looking here to see how the internals are put together: http://www.dermodellbahn...9640-maerklin-inside.htm

I am not 100% certain, but it looks like the speaker is powered by those two white cables that are mounted to the PC board at the right rear.
You should be able to test those outputs for some electrical activity when sounds are activated. A light bulb or multimetre should confirm whether the decoder is still emitting

One thing that I recommend is to remove the lok from the digital tracks, let it sit for a while and then place it on an analog track (test track or layout). Let it run a bit in analog mode, then let sit again and then put it back into digital service. Sometimes, a decoder can reboot following the change from digital to analog and back.

At the same time, if you disactivate mfx, you can try to see whether you can get it to respond to MM using address 64. Use the same procedure as above when switching between MFX and MM.

Please let us know whether it works again or whether it does not respond at all.

Regards

Mike C

Hi Mike, I will have a go at putting it the analogue circuit. Hadn't thought of that. Nothing happened that could have caused the sound to stop working apart from the problem I had attempting to get the rail bus running. That seems to be the simplest test to do. Many thanks for your input here. Still a lot I don't know. Its all been working well over the last few years so have had no need to investigate.
Anders, hopefully Mikes suggestions helps.

Got the loco running on analogue for a few minutes and have now taken it of the track. Will try it on the digital tomorrow. Its amazing how easy it is to operate on either system.

Dereck

Edited by user 01 May 2018 00:43:15(UTC)  | Reason: Not specified

Hello Dereck,

you got 2 MS 2 and 2 trackboxes or 1 trackbox? How many trackboxes do you connect with your layout on the one side and with a MS 2 on the other side?


How to update a CS 2 AND MS 2 please read here Märklin's description

https://www.maerklin.de/...e/downloads/cs2-updates/

On page 22 in the manual for a MS 2 you see all possibilities for the connection of a MS 2 with a CS 2. For your purposes it is totally sufficient connecting your MS 2 at the front side of a CS 2. Therefore you only need the cable which is fixed at the MS 2.

Yes, there is another possibility to connect a MS 2 with a CS 2. First you need a terminal 60125 grey or 60145 black to plug into a socket of a CS 2, at the back side!!!

Into the 60125 you can plug in another MS 2 – but not directly. You need the adapter cable 60124 between the terminal and the MS 2. Because the terminal has sockets with only 7 pins. The plug at the MS 2 has 10 Pins. The adapter cable reduces from 10 to 7 pins. I guess this is the cable you are writing about and asking for and you did not get. But as above mentioned, you do not need this possibility, because you can use the sockets at the front of a CS 2 for a direct plug in of a MS 2. They have 10 pins too.

For the update you and Lasse only need to plug in a MS 2 in one of the front sockets at the CS 2.

Regards

Wolfgang

If it turns out to be the decoder and not under warrranty, I would consider replacing it with an ESU docoder and an apple iphone speaker. When the sound went out on my BR50 I sent it to Scott at Helmut's Hobbies. I've broken more items than I have fixed lately so I sent it to him. All I can say is Wow to the new sound. The iphone speaker(s) sure sound great with the ESU v4 decoder. I actually had to reduce the volume since it was bothering my daughter when she was trying to go to sleep . In addition, the sound seems to be much clearer than the other digital locomotives I have. Plus Scott pulls apart and cleans the motor so that everything is like it was when it was new.

Here are a couple of video clips, I hope they do it justice. I want to thank Scott at Hemlut's Hobbies. I have sent him a few items over the last year and his work & service are top notch (Prima auf Deutsch) in my book.



#2

This sounds to me like the speaker has died, your description of scratchy sound could be typical of this when the speaker doesn't fail outright.

I'm not sure which generation of decoder is in these - if it is an early one it may have a Loksound 3.5 derived Marklin decoder in which case it would use a 100 ohm speaker. All the later generations of Marklin decoders use 8 ohm speakers.

Hi Dereck,

I checked on Marklin website and appears to be a 23mm 8 ohm speaker.

See link below:

https://www.maerklinshop...rds=39640&iBrandId=1

Esu speakers and iPhone speakers etc. normally comes in a little plastic case to enhance the sound, however don’t think there will be space enough inside the little tank loco.

Maybe something like this or you could try and buy the actual spare part from Marklin. Hopefully someone can advise regarding voltage and what watt rating th3 speaker should have?

https://www.ebay.com/itm...:mFMpVYDpQ7Fmh6pEymzClAA

Best Regards
Lasse

According to the parts diagram the speaker used in this loco is Märklin part 508613.

Here is a listing showing the speaker. As can be easily seen, the speaker is 100 ohm and 0.5 watt. I would recommend a speaker that is also 100 ohm. The power rating needs to be at least 0.5 watts or better. You can measure the diameter of the speaker that's in there now to get the correct size. Hope this helps and good luck!

Chuck

https://www.ebay.nl/itm/...il-Neuware-/252268639868

Somebody was asking about pictures from the loco BR 64 (39640). I found some in German and Dutch. But picture is picture as well as the technical details are always in the "same language".

Links:

https://wiki.3rail.nl/index.php/M%C3%A4rklin_39640

https://wiki.3rail.nl/in...in_SoftDrive_Sinus_Motor

https://wiki.3rail.nl/in..._39640-motor-decoder.jpg

outside
http://www.dermodellbahn...39640/39640-maerklin.htm

inside
http://www.dermodellbahn...9640-maerklin-inside.htm

Finally a picture from Stummi community with a 28 mm loudspeaker and a 27 Ohm resistor on the loudspeaker. But the pic shows a model BR 50 not BR 64. It is just to show the loudspeaker with the resistor.

https://stummiforum.de/viewtopic.php?t=61006

But in this thread they write about the 28 mm loudspeaker. By this type of loudspeaker several people had with various type of locos problems and Maerklin are very well informed about this trouble shooting loudspeaker. So probably for your BR 64 it is the loudspeaker too - nothing else.

When you translate the text from post #7 "Märklin BR 64 39640 Sound" he explained he had problems with two locos. First time he sent it to Maerklin and waiting ages getting it repaired back. Second time he called Maerklin told them his problem and Maerklin sent him a new loudspeaker with an 27 Ohm resistor on it. He himself changed this one against the old one. Since them the loco is working fine.

What I myself do not understand: he got the loudspeaker from Maerklin with a 27 Ohm resistor and said it is all right. Does not all loudspeaker have this resistor as a standard equipment built in from Märklin?

In post # 6 of this thread another member is writing he shall use a 100 Ohm resistor otherwise the decoder will blew up. Perhaps here somebody else may explain the discrepancy.

In post #12 there is a link to the Märklin website to a parts diagram. I looked up (Google) the part number for the speaker and it led me to a ebay listing where it shows the speaker and I linked to it in my post #14. You can clearly read the specs on the speaker @ 100 ohms and 0.5 watts.

Chuck

I would trust the Marklin website first.

A random eBay dealer, listing a speaker with Marklin spare part number could easily be a mistake from his/her side or trying to sell speakers that may cover a larger range?

I think you should be ok Dereck with those speakers as you have chosen a watt rating of 1W and looking at the photos I am sure these speakers will fit in your loco. But how the quality will be can of course be the unknown until it gets tested. But considering the low cost it’s worth a try

Best Regards
Lasse

Excuse the language, but I am pissing myself laughing . Marklins web site or parts list is wrong . I got the speakers ok and fitted one. Sounds all working now but bloody awful. Tried another speaker and much the same. Had a look at the speaker that came out to see it was a 100 ohm 0.5 watt speaker, not the 8 ohm 1 watt that was on the marklin site. i HAVE REMOVED THE SPEAKER AND ISOLATED THE WIRES IN THE MEAN TIME IN CASE IT STUFFS THE DECODER. Oh well, only $10.00 down the drain but good experience and very easy to fit. Just needed the body removed and the screw at the back holding the decoder to the frame. The speaker could be eased out without removing the decoder.
At least I know it was just the speaker which was faulty.

Dereck

Hi Dereck,

Looks like Dion from TootToot in ChCh has a Esu 23mm speaker 100 ohm in stock for a merely 15$

See this page: http://www.toottoot.co.nz/products/Esu_catalog.php

Best Regards
Lasse

Well that isn't good at all, assuming the 100ohm speaker is what was fitted by the factory as designed.

Speaker ohm ratings need to be matched to the capability of the amplifier output capabilities, so its the decoder's speaker output that determines if the speaker needs to be 8ohm or 100ohm, and I'd really expect there would be some consistency in this regard, as it makes little sense to have a mix of decoder designs for a variety of speaker loads. Plug the wrong load speaker to an amp and it can make the amp work too hard and harm it worst case, or make the sound really low and awful. Of course it is possible the decoder's amplifier output is capable of driving a very wide range of speaker impedance and adjusting accordingly, so the actual speaker's impedance isn't as critical, but I'd not think that were the case with such a wide range difference from 8ohm to 100ohm. In audio gear one can find 6-8 ohm being ok, but often 4 to 8 ohm requires a switch be set on the amplifier for the change.

If the Märklin docs for the loco (decoder) are wrong, please contact Märklin about it and get some clarity - best case the will maybe fix the incorrect documentation.

I have been informed the 100 ohm 0.5 watt speaker is not available. Would anyone know where I can Get one please.

Dereck

Thanks Alan. Have just asked our local Marklin dealer about it again and mentioned ESU. Have just got back from a 3 week tour of WA so time to look again now.
Dereck

That who I have been asking and he has been in contact with ESU in both U.S. and Europe and they say the speakers are now unavailable. He originally though the had one and took a while getting back to me because he had been searching his stock for me.
Dereck

Dereck I had a quick look today for a 100 ohm to 8 ohm miniature audio transformer in Altronics, Jaycar and briefly in Mouser without luck. Essentially a transformer will trick the decoder into believing that it is powering a 100 ohm speaker even though it is 8 ohms (impedance matching). The transformer can be mounted anywhere you have room in the loco as the length of wire in this instance is not critical. I would expect to pay somewhere in the order of $5 (Aussie) for one.

Good luck.

Regards............Chook.

Hello Dereck,

back from the holidays? And already the MRR ruin your recreation?

I am not an electronic engineer, so I cannot tell you which loudspeaker will exactly fit for your BR 64. But Märklin or a Märklin dealer should know it and have one of these mini loudspeakers in stock, perhaps even left from a sound decoder or where else. The msd/3 always comes with a round and a rectangle mini loudspeaker. Is there not always one remaining?

I only searched for you in the German internet and got some addresses. It needs plenty of time to study their stock equipment. It is huge and finding you are looking for not easy. Perhaps you have to send them a mail too, asking what you are looking for and if they got it and can provide yoou with the correc and exact part.

Some have their web site in English available - some unfortunately not. I just send you the addresse and hopefully they will help you.

https://www.reichelt.de/...8c19c742&LANGUAGE=EN

https://www.lautsprecher...turlautsprecher.html?p=1

https://www.amazon.de/La...ingel-A285/dp/B00R1UQBLE

https://www.conrad.com/c...searchType=mainSearchBar

https://www.conrad.de/de...R_TYPE=Piezo-Signalgeber

http://www.ledprofishop....5331%2FProducts%2F04-006

also some pictures from Google:

https://www.google.de/se...amp;bih=432&dpr=2.07

Hopefully it helps you and yes a lot of work to find where are you looking for.

But today I had my Summer-X-mas time. My Insider Crocodile 39567 has arrvied today! I cannot believe it yet. Have to go back playing a little bit with it.

Regards

Wolfgang

Hello to everyone,
I’ve been hanging around the forum the last couple of years, thanks for the great info!
My brother and I both have a 39640 with low sound levels. We found some 23mmx100ohm speakers, from Bryan at SBSADCC.com. What was special though was the sound chambers that came with them. Added the chamber first and couldn’t believe the difference! Went from barely audible to full sound. The were listed as ESU 50442, the package label reads Zimo MX63. Hope this helps out somebody somewhere! 🚞 I’ll try and post some pics or video later...