PC-3000 Forum

Hi all

I have a defect 040AVVA. made in Hungary.
The PCP looks like AVVN.
Is there any AVVY with ROM-Chips in the world?
On a funcional PCB i have 3.3V at the pin near "U7".
At the Patient PCB there is 0V.

My question are, can i swap the ROM by soldering?
In Savemode the PCB is not functional.

Very Thanks
Bruno

Hello Bruno,

PCB's AVVA and AVVN are usually the same.

Yes, its necessary to resolder ROM and NV-RAM for PCB swap.
If its Mask ROM, which is inside of microprocessor, necessary to find ROM by NV-RAM version and swap PCB with the same ROM version.

Thank you Yuriy

Yesterday i have resolder the NVRAM only and solder to the Donor PCB.
The Drive becom ready. After SA structure checking i could read recover all Data.

best regards
Bruno