Electronics > Repair

Prisma elevator door controller, damaged psu, need identify components

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Harry_22:
Zeners can be 13 volts. This is enough to start the controller (Vcc=9V max).
The main thing is that after start-up Vcc voltage rises slightly (up to 10-11 volts) and turns off Q32.

timeandfrequency:
Buy also a replacement for R114 (100 k).
10 k seems pretty low (lead to a start current of  I = 31 mA)
If the controller does not start with 100 k, you can still try 10 k in a second attempt.

Harry_22:
100k resistor will not burn out as much as 10k in case of Q32 short.

timeandfrequency:

--- Quote from: Harry_22 on December 08, 2024, 09:48:04 pm ---100k resistor will not burn out as much as 10k in case of Q32 short.

--- End quote ---
I already noticed your explanation above.
Let me just allow to have different opinion than yours.

Poroit:
G'day All,

I am not sure if the attached is a help or a hinderance but it contains similar components to the damaged PSU.

I have seen similar damaged components in these as well.

I do not have a schematic.

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