18VDC PSU has dropped to 10v - ZD-915 desoldering station
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
Last edited by hdtvman; 02-03-2021, 11:19 AM.Comment
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
more pictures as requested :-)
main board has 110vac coming in and 164v dc at transformer primary and also at T1 transistor. Nothing at all coming out of the secondary. did not see an obvious F1 thermal fuse - maybe its internal to the transformer... (edit: just read above post - these don't have any - thanks!) also no voltage going out to secondary boards (LCD and controls) no 5v or 18v at the connectors. Reflowed all the dubious solder joints, no joy.
Well I have some answers to the question about why this Desoldering station did not work correctly
Yea I know that this is a old post but he reached out to me about trying to repair it and this is what I found out
Two of the winding are shorted so it has seen better daysLast edited by sam_sam_sam; 04-09-2022, 06:16 PM.Comment
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
I have three issues with doing this
One where do you get the correct diameter winding wires from which is the biggest problem
Second where do you get the wrapping tape from
Third I have never done this before
However I have watch YouTube video on how it is done
Can you please offer some advice the first two issues and I will figure out the last oneComment
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
you can watch diode gone wild for unwinding them,
wire diameter can me determined - tape can be capton
https://www.youtube.com/channel/UCQa...B_Kd54g/videos
if your lucky, they may be touching at the base where they go to the pins and you could seperate them and insulate with some laquerComment
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
you can watch diode gone wild for unwinding them,
wire diameter can me determined - tape can be capton
https://www.youtube.com/channel/UCQa...B_Kd54g/videos
if your lucky, they may be touching at the base where they go to the pins and you could seperate them and insulate with some laquer
But my question is where do I buy the right winding wire to do this with
I would not trust this wiring because it already has this issue I want to use good quality wireComment
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
What just old fashioned transformer would work I will have to try thisComment
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
I have modify one of my Desoldering stations with a 24 volt fan instead of the 12 volt fan that is in it I will see how well this works very soon I also have another one that the fan has also gotten noise so I need to replace it before it starts squeaks real loudlyLast edited by sam_sam_sam; 04-15-2022, 09:07 PM.Comment
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Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station
I also I have a feeling that the switching power supply regulator that was replaced might be a fake because the company logo does not look right for some reason because the detail is not in the logo like it should be I have also replaced my before and I bought them from Digikey and I know that those are real
Also there is a trace on the board where one of the pins to the switching power regulator is like burned off it is repairable but not easily because of the pins are so close to each otherLast edited by sam_sam_sam; 04-15-2022, 09:03 PM.Comment
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sam_sam_sam Do you manage to fix the ZD-915 desoldering station?
What is is your exact issue with your desoldering gun station example switching power supply controller issue
if you are having switching power supply issues please read this post
https://www.badcaps.net/forum/troubl...g-power-supply
Here is another post about this topic
https://www.badcaps.net/forum/troubl...g-power-supply
I personally would not waste my time trying to figure out what is the issue with the original switching power supply because it has been my experience that the repair does not last especially if you have used it for many hours of use because this is what drove me to find a better solution for a switching power supply that can be repaired or just replaced with another new one
Because the original switching power supply is not a very good design or quality so you are at it mercy to weather or not it will continue to work properly or not
You do not say where you are from because I do have several original switching power supply that I am not going to reuse for anything if you are interested in one please PM me and we might be able to work something out together depending upon where you liveLast edited by sam_sam_sam; 12-29-2024, 06:34 AM.Comment
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I know this is an old thread but how do you determine the windings are shorted when at least one shows good on the ring test?
If any winding is shorted, it should affect all windings and none should have high rings, as far as I know.
Or is there a special case where this can happen? Would be interesting to know!"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Welcome to the forum
What is is your exact issue with your desoldering gun station example switching power supply controller issue
if you are having switching power supply issues please read this post
https://www.badcaps.net/forum/troubl...g-power-supply
Here is another post about this topic
https://www.badcaps.net/forum/troubl...g-power-supply
I personally would not waste my time trying to figure out what is the issue with the original switching power supply because it has been my experience that the repair does not last especially if you have used it for many hours of use because this is what drove me to find a better solution for a switching power supply that can be repaired or just replaced with another new one
Because the original switching power supply is not a very good design or quality so you are at it mercy to weather or not it will continue to work properly or not
You do not say where you are from because I do have several original switching power supply that I am not going to reuse for anything if you are interested in one please PM me and we might be able to work something out together depending upon where you live
Thanks Sam for the respond and link attach appreciate a lot and sorry my English not that very good. And yes i manage to fix my power supply unit after few try. The first time i encounter was the explode sound from main unit. After dismantle found damage FSCQ1565RT and zener diode 1N4746 after replace power on the unit intermittent like no enough power and after while no power at all. I'm not electronic expert like you guys but have interested in electronic basic repair. I'm just self taught hobbies learn from google and experts like you guys here . Back to topic i did try again go through very single component all look good and suspect only the transformer and i have the same anatek ring tester like yours too and measure the same way as you do and the result is same as your attach picture. I google around how to use ring tester to measure transformer and found out its different method like this https://www.youtube.com/watch?v=cxBBchUW4xo .So t
he transformer is good working condition if follow the youtube method. I try one last attempt before discard the supply unit into dustbin and finally manage to find the culprit for my case its a Zener diode. When i measure use diode mode with my multimeter its shows good reading when try with peak zener diode tester the reading shows only 8v something suppose 18v. After replace the Zener diode yes its work again as normal for my case almost 40min plus usage. Future i don't know when it will give away again.
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This is the problem with the switching power supply in these desoldering stations you might get it to work again but for how long before it is not repairable because of not being able to get the switching transformer which also seems to fail in a strange way because I have had this happen before and got very discussed with trying to keep repairing them and when I found a switching power supply that could power both the desoldering/soldering station I bought one and modify the original switching power supply for its different power supply rails that are required to operate the controller board and the heater element and the vacuum pump and the back light panel
When I used my desoldering/soldering station I have it on for hours at a time this is the reason I went to a series that has the sleep feature on it because I not always sitting in front of it soldering or desoldering something but it is a hassle to turn it on and off repeatedly just to get something done
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think mine is this one .fast warm up time nice people to deal with . had my stand alone iron fail at around 20 years old and had it replaced for free and other bonuses because of a very rare manufacturing fault far from the cheapest but it works . https://www.chronos.ltd.uk/product/a...ering-station/Last edited by petehall347; 12-31-2024, 09:11 PM.Comment
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by sam_sam_samI have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
by sam_sam_samI have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
by arminiHi everyone!
Three years ago I got a ZD-915 desoldering station which failed just after a few months of light use. During a short desoldering session, the station simply shut down, and since then it has been completely dead and unresponsive. The failure was silent, without any pops.
Due to a lack of time, I set it aside and didn't look at it.
Yesterday, I took it apart and did some basic measurements. The 18v terminal shows 0v. In addition, there is no visible damage to the board itself.
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