Swap PCB.

[peterws]

hi there, I'm going to swap this HDD (HTS545025B9A300) PCB on other similar but I don't know what is this integrated circuit? ( http://allegro.pl/ss0058-hitachi-hts545032b9a300-uklad-s93l-76ad-i5100998242.html) Is it a rom or ADC?. I don't find datasheet it is very useful.

Thanks in advance.

[pcimage]

Why are you going to swap the PCB?

[fzabkar]

The chip is an "NVRAM".

S-93L76A, Seiko Instruments, Low Voltage Operation CMOS Serial E2PROM, 512-word x 16-bit:
http://datasheet.sii-ic.com/en/serial_e ... L76A_E.pdf
http://pdf.datasheetarchive.com/datashe ... -41528.pdf

[peterws]

The chip is an "NVRAM".S-93L76A, Seiko Instruments, Low Voltage Operation CMOS Serial E2PROM, 512-word x 16-bit:
http://datasheet.sii-ic.com/en/serial_e ... L76A_E.pdf
http://pdf.datasheetarchive.com/datashe ... -41528.pdf

Thanks my friend.

Why are you going to swap the PCB?

I have two HDD Hitachi same models, but one the PCB is in short and the other is fine, so I have to interchange PCB. But PCB has two ROM (S-93L76A, Seiko Instruments Low Voltage Operation CMOS Serial E2PROM, 512-word x 16-bit, LE25FU106B CMOS IC 1M-bit (128K Serial Flash Memory)).

So my question is Have I to interchange both ROMs or both ROMs + uM?

Thanks in advance.

[fzabkar]

Did you check the fuse and the TVS diode?

[fzabkar]

See viewtopic.php?f=1&t=22287

[pcimage]

Did you check the fuse and the TVS diode?

That's the first thing to do.

Then you can try a PCB swap. The NVRAM chip MUST be changed, but the ROM chip might not need to be changed if it's the same version as the donor. Usually if the first two lines on the little white sticker on the PCB match, then the version should be the same.

Try with the NVRAM alone first, and see if the drive spins up. If it doesn't spin then the NVRAM and ROM aren't compatible so you'll need to switch the ROM too.

Be VERY careful not to damage or mixup the chips, especially the NVRAM (I suggest marking them somehow).