My Telefunken Studio M1 is burning

[BoomboxLover48]

I would definitely try to power up on 12V DC.

Let us see what happens. Be EXTRA careful about polarity. Double check before you connect.
Then we can isolate it to AC to DC power supply failure.

 

[Superduper]

I would definitely try to power up on 12V DC.

Let us see what happens. Be EXTRA careful about polarity. Double check before you connect.
Then we can isolate it to AC to DC power supply failure.

On his very first post, (post #1), he already indicated that the burning smell was present on AC or Batteries. The failure to power up now is probably related to the burning smell which, presumably whatever was heating up is now toast.

 

[BoomboxLover48]

I would definitely try to power up on 12V DC.

Let us see what happens. Be EXTRA careful about polarity. Double check before you connect.
Then we can isolate it to AC to DC power supply failure.

On his very first post, (post #1), he already indicated that the burning smell was present on AC or Batteries. The failure to power up now is probably related to the burning smell which, presumably whatever was heating up is now toast.

My mistake! I didn't see that. Oh my!

 

[stevenrob]

I think I'm really in trouble with my Telefunken. If somenone can say me what parts I could change... Thanks

 

[MyOhMy]

Bill reminded me a new word "snobby"

I hardly used it...


Now what is the current situation with the box?

I never had any problem like that with a box.

Possibly this could be from the AC to DC power supply circuit.

I would sniff around.. and look for any charred areas.

I would try to make it work on 12V DC and see if things go well.


Here is a good link ...https://boomboxery.com/forum/index.php/topic/9484-issue-with-telefunken-hifi-studio-1-power-supply/

~Royce

Ha! I see what you did there - current situation!



(I'll get my coat..................................................)

 

[IVH]

Bonsoir fellow frenchman,
Just my 2 cents. Wouldn't it be a good idea to connect it to AC and then check everything with a voltmeter (from the power supply up to the remaining of the box)?
That would be a good start I think, but again, that's just my opinion.
Salutations,
inse.

PS: I will be careful with 'hello' too from now on, never thought about it this way

 

[stevenrob]

Bonsoir, je suis toujours dans la merde, but I have found a guy who can help me. I'm going to buy parts to repair the telefunken. I'll give some news.
I hope I will be able to repair it because it is almost mint condition.
Now, I'm going to bed

 

[stevenrob]

Hi,

A lot of problems with this boombox
Overheated, plastic broken in the tape deck (I have repaired with a peace of aluminum), a broken spring.
Actually, I'm changing resistors and capacitors...

I hope it will be a happy end...

 

[blu_fuz]

This is turning out to be a project., good luck!

 

[superlew]

I had to put my 1M aside, as it needs so much work and I have so little time. Glad to see you're sticking with it. I'm finding those gray ECCOM caps are pretty bad. I pulled few (7 total) from mine in random spots to check them. Every single one was pretty well out-of-spec. That's when I decided I'd come back to it in the Spring.
Yup - I plan on doing a wholesale re-cap. I know a lot of guys frown upon a full re-cap, but if they're all bad, they're bad and they ain't coming back to life. :ghost:

Would you mind posting a detailed pic of the power switch, if you have the front open? The wrong switch is installed in mine and I'm lucky it didn't burn the house down. I can't find a part number for it and I'm hellbent on getting it sorted sooner or later.

 

[stevenrob]

Hello,

I have tested : the amplifier seems to be OK . A cool guy from Sri Lanka, Dilshan Jayakody, is also helping me, he's very patient
The 2 vu-meter only works with tape deck, not with radio, but I think it is normal.

There is a problem with light bulbs of the 2 vu-meter : I have removed the light bulbs because they were dead. there is + and - (look at photo) but there is electricity on + and - too. I have study the service manual (I have tried). The 314 is the + of the lights bulbs and the 315 is -. The 314 and 315 plug to M414 and M415 on the amplifier board. But there is electricity coming from M415 and it is not normal.



Now, I wait for a new spring for the tape deck (a factory will make exactly the same for me but it is expensive for a peace of iron 30 usd ).

I would like to put a little spring. If someone has a photo.

For Superlew : it is ok for you ?

 

[superlew]

Thanks, stevenrob - That's perfect!
Now to source a replacement. I'm heading to FL for a little while, so I'll get back to it when I return.
Again, thank you. You just posted the best pic of the switch on the whole internet - and, from what I've heard, the internet is pretty big.

 

[IVH]

Concerning the VU meters, on some boxes they don't act as VU meters when it is set to radio. But as signal strength meters

 

[Reli]

The VU's on the Telefunken only work when the deck is playing or recording

 

[stevenrob]

Hi,

you're right ! It is strange. I'm a newbie in lectronic, so I change a lot of capacitors. I hope I could repair the problem of lights.

 

[stevenrob]

Hi,

after changing a lot of parts... The light is OK. I prefer leds (with) for their long life. The spot effect seems to be strong on photo but it is an illusion.

 

[stevenrob]

Hello,

you know perhaps that my boombox works fine. But it remains this strange part and I don't know its position.

best fregards

 

[superlew]

I thought it might be part of the deck, but it's not.

I'm pretty sure it's a variation of this bracket.:


It secures the front of the large board for the deck. It looks like your version clears the grounded plate above and secures to the front plate of the amp/pre-amp.:


I've noticed several design variations across the HiFi Studio spectrum as I've been following other threads while I work on my own.

 

[stevenrob]

Ok, I'm going to study this system