HP Designjet T520 B4C771A0 error code

[Ron_Starnes]

Hi,

We have a designjet T520 with error code B4C771A0. We have had a tech come out and replace the formatter board but the error code still remains.

Any suggestions would be heplfull.

Thank you,

Ron

[Jasmin1981]

For all blue screen errors

You need to replace Designjet Encrypted chip for t520 

It is mounted on the mainboard in usb slot 

you can buy it here http://www.ebay.co.uk/itm/HP-Designjet-T520-Blue-Screen-Error-Solution-Encrypted-chip-/282437647624

[rasheddul]

Hi,  Thanks for contacting with support forum.

Please ensure that replacement main PCA new with USB dongle included. 

If their haven't with USB dongle,  please purchase that dongle from hp parts for 25.00 which is the way I would first go since it is a lot cheaper then the main board which comes with the same drive.  The part number is CQ890-67105.

Just go to the link below and put the part number in to order.

https://parts.hp.com/hpparts/Default.aspx?mscssid=

Please search service manual from google and check the replacement process of main PCA.

Please let me know if you have questions.

Please give me thumbs and accept my answers. 

Regards, 

Rashed

[Ron_Starnes]

Hi Rashed,

Quick Question,  The USB dongel is there and after reading the post from Jasmin1981.

 I remenber that the tech put the old encription Key onto the new board.  You think it might be the key thats bad?

Thanks,

Ron

[rasheddul]

Yes, that's key failed. While try to initial the printer single will not process the data that's why printer had given error.

Regards
Rashed