Electronics > Repair
Sorensen DLM300-2 need blown part numbers.
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R-1125F:

I am working on an Sorensen  DLM300-2 power supply.  It shuts down when the voltage is turned up to 004.  It looks like the OVP is shutting down when adjusted to over 4 volts.  Some parts are damaged and I can’t read the part numbers. See attached photo. 

R385 is burned but looks like 4R?   Last digit is not readable. I would like to know the value of this part.

R322 looks overheated but appears to be a 22R1 or 20R1.  I would like to know the exact value.

Q48 is destroyed and code is not readable.   Q40 is a Onsemi P1F, PZT2222AT1.  I am guessing that that Q48 is the complementary PZT2907AT1.  Could someone verify this?
fzabkar:
Can you identify Q101 and Q100? These appear to be the driver transistors. That should tell you whether the next stage is PNP or NPN.
R-1125F:
Thank you.

Q101 is coded as 2F (2N2907A ?)
Q100 is coded as 1P (2N2222A ?)

fzabkar:
Those two transistors are described as complementary to each other.

https://www.diodes.com/assets/Datasheets/ds30041.pdf
https://www.diodes.com/assets/Datasheets/MMBT2907A.pdf

Therefore, I think your guess for the damaged transistor is probably correct.

I would think that "4R?" is most likely to be 4R7, as this is a preferred value.

If we assume that this circuit is symmetrical, then R322 = R289 = 2001.
R-1125F:
Should that be 4.7 Ohms or 4.7k Ohms?
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