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Disaster with my gf 777


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#31 ScareDe2

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Posted 12 August 2016 - 12:09 AM

Once I did accidently (kinda) plugged one of my DT680 into a 220v converter and it stopped working immediatly with a burning smell. Only lights would work, nothing else (but I did not test cassette). I did interchanged the capacitors/amplifier section and it worked again. Fuses were both fine.

 

Sorry if that doesn't help.

 

 

...why they put fuses in that thing??



#32 samovar

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Posted 12 August 2016 - 02:56 AM

Were are you located in Italy, tatto? My tech is pretty good and may solve your problem. Now he is on holidays but If you are not pressed for time, he will be back in September. I can put you in touch with him, if you will. However, since Superduper is already providing unvaluable assistance, in your shoes I'd first try to determine if the unit can actually be rescued.

#33 tatto

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Posted 06 September 2016 - 03:46 AM

So today I've taken my dead boombox back from repair shop. The technician said that voltages are ok and he said that a certain point doesn't work nothing anymore. He didn't wanted to open the case again, but he said that the fault is probably here:

 

photo_2016_09_06_11_40_54.jpg

The problem starts here were "power supply is written"

 

photo_2016_09_06_11_40_50.jpg
 
The rest is all ok, but the "?" is unknown, probably the tuner section. 


photo_2016_09_06_11_41_00.jpg
 

 

Amp section is ok, the first power supply section is ok, but i don'T unserstand why he calls the tape motor section "power supply". The tape engines are working too. The only think which doesn't work are the vu meters, with no lights and movement too despite the bulb is ok, and the elaboration of every audio signal like radio, tape and line-in.  When the fault occured, the box was set on line-in. probably its gone something after the line-in commutator? 

 

Edit: About the vu meters, they are only connected to the "power supply". Or am i wrong?



#34 tatto

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Posted 06 September 2016 - 03:47 AM

Were are you located in Italy, tatto? My tech is pretty good and may solve your problem. Now he is on holidays but If you are not pressed for time, he will be back in September. I can put you in touch with him, if you will. However, since Superduper is already providing unvaluable assistance, in your shoes I'd first try to determine if the unit can actually be rescued.

I'm in Puglia, extreme south part of italy.



#35 Superduper

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Posted 06 September 2016 - 12:19 PM

Well, the diagrams you are showing are block diagrams, which are merely simplified modular representations of circuit flow.  They are not meant to be literal.  When your tech could take a whole modular block and say the problem is "probably" here, then that tells us absolutely nothing.  Had he taken an actual circuit diagram (schematic) and made notes along the way indicating what voltages where discovered where, then that might actually have been useful.

 

Long ago, I asked you to make very specific measurements for us to consider.  Instead you are now referring to your technician (who can't fix your boombox) and his very "vague" comment that voltages is OK except that it doesn't work anymore at a certain point.  We could have told you that months ago.  In fact, the point where it doesn't work anymore is exactly what we are trying to find which is why I asked you to take voltage measurements at very specific points.  And I would never accept an answer that "everything is OK."  Rather I would want exact measurement at exact points.  

 

Unfortunately, it looks like I myself am unable to help you any further.  The information that I would need in order to be able to assist from thousands of miles away requires the actual hands on person to be able to perform very specific (though simple) measurement tests that I feel can be trusted.  Maybe someone else can help throw suggestions to you.



#36 tatto

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Posted 06 September 2016 - 01:47 PM

I've showed your posts to the tech and he says voltages are all 12. I have a multimeter now so i will try something. I really apreciate your help.