Edited: Added more pictures.
I'm reverse engineering a PCB but I'm stuck at one component. I can't find out what it is.
I thought it is a diode because of the marking on top of it but when I test it with a multimeter it behaves like a resistor.
It allows current to flow in both directions (tested with continuity test with a multimeter.)
Can someone identify what this is and what component could be used as a replacement for this?
This is an old board and I think this chip is not made anymore.
The marking on the chip is R5 04. Some boards have R5 03 or R5 07 or R5 14.
Here is the picture:
I found two other boards that are been made later than the other one and found different chip markings. The first one that I measured I think has a damaged diode since it allowed current both ways.
The ones I have tested now only allow current in one direction. Tested it just using a multimeter in resistance mode and it gave 13K.
I will have to test it later after removing.
The second marking on the bottom is definitely voltage since this one has 30 it means 30V
The other diode has a different marking: SJ 4CA