ST9750420AS

[unknown]

Hello
The drive in topic spinning normally and shows (busy).
Terminal output:

EarlySpinup Enabled
Rst 0x10M
ASCII Diag mode

F3 T>
LED:00000067 FAddr:003851A2
LED:00000067 FAddr:003851A2
LED:00000067 FAddr:003851A2

Any thoughts?
Thanks in advance.

[fzabkar]

I don't think it helps but ...

Code:

0x67 UNDEFINED_INSTRUCTION -- Undefined opcode exception

The error would suggest that the firmware has become "lost".

[Doomer]

Could be dead heads

[Martin]

Both fzabkar and Doomer answers are correct and could be simultaneously. I would like to check heads first in order to localize the problem.

[unknown]

Thanks for reply fzabkar, Doomer and Martin.
Heads are perfectly working on a donor drive.
I would like to know the read channel points. I will post the PCB pic.
Thanks in advance.

[unknown]

With PCB isolated:
EarlySpinup Enabled
Rst 0x10M
ExecuteSpinRequest
LED:00000067 FAddr:00380340
LED:00000067 FAddr:00380340
LED:00000067 FAddr:00380340

Attachments

[Martin]

Here it is.

Attachments

[unknown]

Thank you Martin.
With Donor PCB and donor ROM the drive become ready and reach F3.

Is that mean patient ROM corrupted?

[unknown]

Here's the backup of the two ROMs (Patient and Donor):

Attachments

Patient.rar

(435.97 KiB) Downloaded 659 times

Donor.rar

(427.3 KiB) Downloaded 619 times

[Martin]

It means there is a coruption in SA. Probably, overlay.

[lcoughey]

Does the S/N in the ROM match the S/N on the drive?

[unknown]

Does the S/N in the ROM match the S/N on the drive?

Yes.

[rames lopes]

Could you inform the patient and donor PCB number

Compatible PCBs for this model are 100620560 REV.A 100619769 100610953

if you have these PCBs in good condition in your labs, you could see which terminal output to the PCB connecting the HDD and separate from the HDD if F3 T> stable without restarting and crashing

or

EarlySpinup Enabled
Rst 0x10M
ExecuteSpinRequest
LED:00000067