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Forum: µC & Digital Electronics Soldering station Ersa RDS-80


von Leonid S. (leo62)


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Soldering station Ersa RDS-80. A diode or zener diode with a gray stripe 
is leaking.
We need help in identifying this part and its denominations.

von argos (Guest)


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Below you can find a very crude schematic. Looks like the diode in 
question, probably a generic silicon model (1N4148 or similar), protects 
the switching transistor from reverse current/voltage.

https://www.fingers-welt.de/phpBB/viewtopic.php?t=7176

von Leonid S. (leo62)


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All diodes 1N4148 with a black stripe, and this one with a gray.
I would like to get a specific answer on this detail.

von OSchlaffel (Guest)


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Zener diode

  Vz   |\'|  Vf
       | \|
-------|--|--------
       | /|
       |/ |

          Vf
        | .
        | .
        |.
--------|----------
     .  |
    .   |
   . Vz |

Why do you think the diode is leaking?

von Steven (Guest)


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Leonid S. wrote:
> A diode or zener diode with a gray stripe is leaking.

What do you mean if you say "leaking".
Please show the characteristic curve.

von Leonid S. (leo62)


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Tester readings in diode test mode.

: Edited by User
von Steven (Guest)


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Leonid S. wrote:
> Tester readings in diode test mode.

What are these numbers?

von Leonid S. (leo62)


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Steven wrote:
> What are these numbers?

The tester displays the voltage drop in millivolts.
https://www.youtube.com/watch?v=3ET6FU3mKuU&t=90s

: Edited by User
von OSchlaffel (Guest)


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Eventually BAS81, 82, 83, 85, 86

von OSchlaffel (Guest)


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von OSchlaffel (Guest)


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von false friend (Guest)


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OSchlaffel wrote:
> Eventually

Mal nachschlagen!

von Leonid S. (leo62)


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OSchlaffel wrote:
> В итоге BAS81, 82, 83, 85, 86

Many thanks.

: Edited by User
von With me is not good cherry eating (Guest)


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false friend wrote:
> OSchlaffel wrote:
>> Eventually
>
> Mal nachschlagen!

My dear mister choral society, I think I am spidering, why are you 
making down your collegue in full trains. His tip shines to be first 
cream. I would like to let me out but I will make me on the socks.

von With me is not good cherry eating (Guest)


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I'm sorry, I have a jump in the bowl and I hope I did not walk on 
anybody's bisquit

von OSchlaffel (Guest)


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Leonid S. wrote:
> OSchlaffel wrote:
>> В итоге BAS81, 82, 83, 85, 86
>
> Many thanks.

Hello Leonid,

the BAS8x could possibly be that diode you're looking for. MELF diodes 
with one grey stripe is only the BAS8x ones.
Actually, as I saw, are these ones only awailable from Vishay, note, 
that this ones from Vishay have a black stripe instead of the grey one. 
But the parameter should be equivalent as can be seen in the datasheet.
Verify therefore other photos of the RDS80 board. You'll find some with 
that diode have a black stripe.
But could you find out why the diode has become faulty?
The SOT23 device (possibly a transistor), which is connected to that 
diode, could be faulty too.
You also have to check other components become possibly faulty.
What is the matter with that soldering station?

Regards

von Netzbeschmutzer (Guest)


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With me is not good cherry eating wrote:
> I'm sorry, I have a jump in the bowl and I hope I did not walk on
> anybody's bisquit

Silly boy, but that german sayings literally translated into English 
sound funny...

von With me is not good cherry eating (Guest)


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Netzbeschmutzer wrote:
> Silly boy
My dear mister choral society, when I read this I looked stupidly out of 
the laundry. It is not sausage, because of language like this the forum 
is  transforming into a juice shop.

von Netzbeschmutzer (Guest)


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With me is not good cherry eating wrote:
> My dear mister choral society, when I read this I looked stupidly out of
> the laundry. It is not sausage, because of language like this the forum
> is  transforming into a juice shop.

You are great! You made me laugh head off. What a pity, Englishmen will 
not really understand your great jokes. Please keep on joking in the 
"juice shop"!

von Leonid S. (leo62)


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OSchlaffel wrote:
> Вы также должны проверить, что другие компоненты могут быть
> неисправными.
> Что с той паяльной станцией?

  The station has been operating for over 10 years. She began to 
experience similar symptoms described here:
https://www.fingers-welt.de/phpBB/viewtopic.php?t=7176
Similarly, the 3b smd pnp transistor sot-23 (bc856) and this unknown 
diode were heated.
   All other elements are working and this transistor next to the diode 
is also working. I assume that the transistor opens when the triac is 
closed by the command from the processor for
 supplying voltage +5 v at the time of measuring the resistance of the 
soldering iron heater.
   Also, for this unknown diode at a certain moment, a voltage of 24V is 
suitable.
the soldering iron heats up when the triac is closed.
   There were cases when the plug came off when working with the 
soldering station
soldering iron cord. Perhaps at this moment without load, the process 
failed and both voltages + 5v and an alternating voltage of 24v were 
encountered on this ill-fated diode, which was the result of a 
malfunction.
    Apparently it was a Schottky diode, I put 1N4148. The station is 
working properly now, time will tell.

: Edited by User
von OSchlaffel (Guest)


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Hi Leonid,

nice to hear that your soldering station is now working.
With a 1N4148 it should be functioning as well as withe the BAS8x ones.
But if you order some parts in the future so also place some BAS8x ones 
to your order Maybe the 40V (BAS81) type should be good enough, but I 
would choose the 60V (BAS83) to ensure a safety margin.
Than by time I would replace the 1N4148 by the BAS83.

Regards

von Leonid S. (leo62)


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I have already ordered in the online store (BAS83) and I definitely want 
to change 1n4148.

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von Leonid S. (leo62)


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The diode is in the voltage divider, and takes an active part in 
measuring the resistance heating element of the soldering iron. From 
characteristics depends temperature.

: Edited by User

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