Goldscan 4 Differences between the schematic and The circuit board

[surf-tech]

Hello everyone
I found some differences between the schematic of Goldscan 4 and This circuit board
Do I need to change something or the circuit board is correct?
Unfortunately, I wanted to upload a lay6 file but I am not allowed

[dbanner]

I am the person who did the reverse engineering of the original Goldscan 4 PCB. Since it was drawn from an original working PCB, you can trust it. I seem to remember some confusion with the FET pinouts. I don't recall exactly. It was couple years back.

I'll try to find my Lay.6 file and compare it to what you have.

Pack your lay file in a zip or rar file for upload.

[dbanner]

Here is my file.

[Op04]

Wow...Many Thanks

[surf-tech]

I am the person who did the reverse engineering of the original Goldscan 4 PCB. Since it was drawn from an original working PCB, you can trust it. I seem to remember some confusion with the FET pinouts. I don't recall exactly. It was couple years back.

I'll try to find my Lay.6 file and compare it to what you have.

Pack your lay file in a zip or rar file for upload.

Thank you, my brother.

[surf-tech]

Here is my file.

Thank you, my brother.

[dbanner]

2N3906 pinout is supposed to be EBC, however on the layout it is showing ECB, which tells me that it is not a 2N series transistor, but some other small signal transistor. If you figure this in, then it will match up with the schematic.
It is probably a 2SA or BC series transistor.(PNP)

Unless there is a 2N3906 transistor with a TO92A package which is ECB.

[dbanner]

OK, I think I know what happened. When I drew out the pcb layout, I used this schematic GS-4 1.pdf to label most of the components. Obviously a 2N3906 does not correspond to the footprint on the layout, but this is trivial oversight. It is some other small signal transistor with ECB pinout footprint. I think the same might apply to the JFET's footprint, you'll have to check those yourself.

[surf-tech]

OK, I think I know what happened. When I drew out the pcb layout, I used this schematic GS-4 1.pdf to label most of the components. Obviously a 2N3906 does not correspond to the footprint on the layout, but this is trivial oversight. It is some other small signal transistor with ECB pinout footprint. I think the same might apply to the JFET's footprint, you'll have to check those yourself.

Thank you for the explanation.

[Carl-NC]

Unfortunately, I wanted to upload a lay6 file but I am not allowed

You can upload any kind of file if you zip it first.

[surf-tech]

Well done, that's what I meant. I compared it to this schematic.