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.
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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
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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.
Zener diode
Vz |\'| Vf
| \|
-------|--|--------
| /|
|/ |
Vf
| .
| .
|.
--------|----------
. |
. |
. Vz |
Why do you think the diode is leaking?
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.
Steven wrote: > What are these numbers? The tester displays the voltage drop in millivolts. https://www.youtube.com/watch?v=3ET6FU3mKuU&t=90s
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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.
I'm sorry, I have a jump in the bowl and I hope I did not walk on anybody's bisquit
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
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...
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.
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"!
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.
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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
I have already ordered in the online store (BAS83) and I definitely want to change 1n4148.
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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.
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Leonid S. wrote: > 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. somebody now the exact numbers of the thing i just can read thats a ATMLH820 but can not read anymore is short the numbers the other thing is that i can't find somthing with ATMLH820 found something with ATMLH822 i am not sure if is the same .
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Lubi wrote: > somebody now the exact numbers of the thing i just can read thats a > ATMLH820 but can not read anymore is short the numbers the other thing > is that i can't find somthing with ATMLH820 So it seems this is about the EEPROM bottom left on your attached pic? No guarantees, I often just quickly glare over the contents of sites and documents So "ATMLH820" is just *"ATMH" + date code* and is not sufficient info to identify that EEPROM, because you can find different Atmel products with "ATMLH820" But here are some indicators for what that part could be, NO GUARANTEES Here somebody states that it is an Atmel 24C02, alongside your picture of the pcb. He writes "Speicher: Atmel 24C02". One can barely see the characters of the second line, but looks like "24C02BN" to me Beitrag "Re: RDS-80 verhält sich seltsam" Here there is a pcb from elektroda.pl that seems to look like the one you are showing, but there is an EEPROM from ST on that spot, an ST 24C02, which maybe might be compatible to your Atmel chip see also attachment https://www.elektroda.pl/rtvforum/topic3450385.html So maybe your part might be an AT24C02x, based on all the above Just to show an example of an AT24C02, the first attachment shows an Atmel 24C02B with date code "ATMLH820" and product code "02B"next to the data sheet marking info Atmel 24C02b data sheet https://ww1.microchip.com/downloads/en/devicedoc/doc5126.pdf Source for the Atmel 24C02 pic https://romiani.com/product/atmlh820/
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