Electronics > Repair
Prisma elevator door controller, damaged psu, need identify components
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PiotrMisiuna:
Could not locate any photos of the PCB, attaching best I could make, maybe will help someone else.
There is several versions of the box but I don't believe they will differ much in layout, especially on the primary side of the psu.

 Killed by a drop of water, I did some reverse engineering, but with my low experience I don't believe I can make it without help.
Components on the schematic marked in red are the damaged ones.

Seams obvious that all the carnage was caused by arc under the C37.
I hope that blown components broke the circuit before melting the transformer, it does not appear to me melted.
Not sure how to determine the value of the Z7 zener diode...


list of components I wish to find markings for:
R114
Q32
Z7
R85
U10
fzabkar:
UC3842?

https://www.ti.com/lit/ds/symlink/uc3842.pdf
Harry_22:
Well, finally! One person who got together and redrew the circuit from the PCB.

 It will be a pleasure to help you!
 I'll take a look a little later.
Harry_22:
Hi!
Could you carefully clean R114 and try to read the color code.
Also make a good photo of Q32, U10 area.
PiotrMisiuna:
R114 has the bands visible on the other side but I think the paint pealed off due to temperature and what's left is just a discolored substrate.
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