Problem with SP0802N

[igen]

Hi Everyone,

Ihave a little problem....

Patient:
Samsung SP0802N,
1 plater, 2 heads
P/V : FS
Rev. E
PALO

(Disk was a few monts ago in my hand - i have modules SA
Now, i have this hdd again)

Disk stuck.

I have donor - practicaly identical (model, FS, map heads).

I was heads swap - disk stuck 8 match and down motor. After this operation, disk not detected. Below data from terminal:

SpnOk
DAC:-00149
H: +00000
SK C: 0000E9E3
AP_TO
C: 0000013B H: +00000
DAC:+00000
UF: Seq Sk err
H: +00001
UF: 1. 1st Gray err
H: +00000
SK C: 0000E765
AP_TO
C: 00000135 H: +00000
DAC:+00000
UF: Seq Sk err
H: +00001
UF: 1. 1st Gray err
H: +00000
SK C: 0000E667
AP_TO
C: 00000137 H: +00000
DAC:+00000
UF: Seq Sk err
H: +00001
UF: 1. 1st Gray err
H: +00000
SK C: 0000E78C
AP_TO
C: 00000134 H: +00000
DAC:+00000
UF: Seq Sk err
H: +00001
UF: 1. 1st Gray err
ENG>SRV>
When put original heads back to donnor all is ok (with native PCB or PCB from patient)

I was try hot swap - disk stuck still - no communication...
What i can do it ?

Thanks for all constructive solution..

Igen

[dmarques]

Hi,

I suppose that heads are clicking when you power on the drive.
But after they knock a few times, doesn't the drive go into ready state?

[igen]

Thanks DataLabAce for quick answer.

No, after they knock a few times, this drive doesn't into ready state (self). Just stop motor and still busy. However, when I run the utility with parameters "soft reset" disk run ready state (DRD & DCS). The motor stil not work, but the first detect is almost corect (corectly show model, FW and capacity - without sn.). After start further utylity hdd show (motor even durning try read SA still off):




Thanks for further idea..
Igen

[-BR-]

Hi igen
i have reached success sometimes in such situation
try to perform hot swap after head exchange
you can find the information on how to perform hot-swap for samsung palo by searching in this forum
-BR-

[AJ2008]

Maybe you have damage to ALIST? this can sometimes cause knocking and sropping of spindle. Perform hot swap and check SA, I think ALIST modules may be defective

[igen]

I have written already, that i I tested try hot swap after head exchange. I have good copy SA (have older backup SA from this disk, when disk was OK), and i'm sure, that have made hot swap corectly - rewrite on donor folow modules (from older backup SA):

"06 CONFIG"
"10 SLISTHDR"
"11 SLIST"
"12 TLIST"
"13 ALIST"
"5D CONFIG2"

Please, continue soultion, mayby any new ideas...

Thx, IGEN

[-BR-]

What happened after hot swap? The disk stop spindle again?
Try to add "62 ALISTHDR" to donor before hot swap
-BR-

[igen]

After hotswap done, motor start and click, click, click..... many, many times...

62 ALISTHDR is not present in original list SA (from this disk, in my old copy)

thx
igen

[-BR-]

In your case I would try to perform head swap another time using a different donor, offcourse matching P/V=?X
If it does not work, then I would consider this hdd unrecoverable

I was heads swap - disk stuck 8 match and down motor.

I believe you mean that after head swap procediment heads are knocking 8 times than stop spindle motor
If that is right, there is a good chance of head or pre-amp incompatibility

-BR-

[Pepe]

Hi,

This is alignment related problem. Either use another donor, or work around the head alignment issue.
With samsungs only these 2 head models have alignment issues, bigger ones work well with donor MHAs, never experienced such problem.

pepe

[Pepe]

Hi,

This is alignment related problem. Either use another donor, or work around the head alignment issue.
With samsungs only these 2 head models have alignment issues, bigger ones work well with donor MHAs, never experienced such problem.

pepe

[ddr]

Hi,

How does one work around such head alignment problems?

Regards
Joel