SMD transistor/ic "5131Z"

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Grossel

Well-Known Member
Hi.

This 3 leg component (looks like any other smd transistors) is found within an old HP 930C printer from 2001, more specific it is located at the internal power supply board, hi voltage side.
I haven't done any attempt to draw the schematic, doing so may help identify it's real type.

However, I'm interrested in being able to work out what kind of component it is based on it's printed number - if possible.

So far, google haven't being of any help - only wasted my time redirecting to click-bait websites (I mean, those that list up millions of part numbers at once just so someone get to follow its links).

PCB board:
ASTEC MODEL : AA20550
HP PART NO : C6426-60081
white label underneath: B266816R1 0103
 
Bumb. No one have any idea?

From what I know about it for now, the pin-3, normally collector if standard BJT is connected to rectified minus at primary side (there is no designated gnd on this so I go with "minus" notation for now).
Pin1 (usually base if being standard bjt model) connected to a diode anode, feed from L from before rectifier via resistor network.
Pin2 connected to pin 1 on a AS998 PWM controller, 0V input (ok, I struggle to find any reference online what function that "0V" pin should have)
 
Ok, so I have worked out how the scematic are probably assembled.

It seems like it is most likely a NPN BJT, so it's kind of guess work about this.

I opted to use some non-standarized symbols (HP made it kind of hard to trace so I did too), as including the zeero-value smd resistors. This was only including for make it easier for me to trace, and just didn't remove.

None of the SMD components was labeled, so I had to make those up (all labeled components above 100 are SMD mounted).

What make this SMTP interresting is that the controller unit ( IC1 ) take feedback from both voltage and current as well as mains voltage.
 

Attachments

  • Schematic (probably) ASTEC AA20550.pdf
    53.7 KB · Views: 403
Nigel Goodwin said:
I would suggest more like over current protection rather than feedback?.
Click to expand...
Yes I'd think that as well - but for the "OV" input, the datasheet for the AS998 pwm controller says (link):


The sentence I've underlined is the one that I cannot make sense of. Or - maybe the datasheet is incomplete and that pin can be used as overcurrent as well ?
 
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