Help me identifying the diode

[josipk]

Does anybody recognize the characteristics of schottky diode 34 30 on the picture (red arrow)? How could I test it?
May be this diode is the solution of reversed polarity problem on Minolta DiMAGE Scan Elite 5400 (production year 2004)?
Rgds
Josip

[Armadillo]

This is a small scanner.

Hence; I suspect this is a SS34
Is a 3A diode hence 34 3.0amp

[Armadillo]

It may be a short circuit elsewhere.

Hence if you want to test it, best would be to unsolder it from the circuit board and use a multimeter in diode mode, just like any diode, conduct in one way only.

But like I said, it's more likely a short circuit elsewhere.

[josipk]

Thanks for suggestion.
Yes, I accidentally connected reverse polarity to scanner and after that there is no chance to switch it on.

[Armadillo]

Then you should check continuity of fuse instead.

Like on the circuit board, should be many fuses like marking FB31 for example.

[djQUAN]

From my list of components, 34 is RB160L-40 40V 1A schottky diode by Rohm. "30" is the date/batch code.
https://www.rohm.co.jp/datasheet/RB160L-40/rb160l-40te25-e

FB31 is a ferrite bead, not a fuse.

[Armadillo]

Oh hahahahaha, these miniature creatures, mA rated, no idea if it will sustain a direct reverse short circuit?   

[josipk]

Question after reading the datasheet: reverse polarity could cause thermal destruction of diode?