That image was not very helpful since it doesn't say what 1, 2 and 3 are . . .
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Not a very helpful image, above, since it doesn't say what pins 1, 2 and 3 are . . . See attached.Comment
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I used the same size font as the rest of the components; I will enlarge that portion of the board for you to see the numbers.
Your picture does not show the numbers on Q2, but configured as it is to drive the relay, the base would need to be driven by U2
If it was reversed, the base would be connected to ground.
If the transistor lead was broken, that would explain why it was not working.Last edited by R_J; 09-21-2025, 12:03 PM.Comment
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Ah . . . OK! . . . I was just so focused on the numbers on the 53A3P IC . . .
Well, we'll see about the transistor. IF that one is the one I did not pull, and if it was already broken (after all, I was amazed this morning when I thought I had broken it just tilting it a little, because it was literally going to be the most brittle thing ever seen . . .)
I should have one on Tuesday.
Thanks again!
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I 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... -
I 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... -
I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
These cheap non brand capacitors at it again
Last night we had a power outage [ long drawn out trying three to come back up before going out completely ] and when I went to turn the DVR camera recorder back today no go 3 bad capacitors ( one capacitor no ESR reading on DVR board the other 3 capacitor on the power supply board over 40 ohm this is not a misprint ) on the external switching power supply and one capacitor on the DVR camera recorder board where the power supply that goes to the hard drive disk is
Well at least I have the cameras back on line I to try the... -
Hi everyone,
Yes ! How does this switching PS works ? :-)
I understand (not in deep, of course) the switching PS principle; typically, I'd expect to get a VCC just to "feed up" the STR or the Switching regulator, but I cannot figure how this VCC is "created" (on a TV switching PSU, I often see some cascaded resistors, but here, I believe that one of the transformer input should make the permanent VCC, but I cannot figure where )
Thanks for your help. I already wrote some explanation of what I was having and did some measurements here ...
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