WD400JB-00ENA0 head exchange failed (alignment issues?)

[TerraNova]

Hi guys

I have WD400JB-00ENA0 where the preamp is damaged. I tried head exchange but unsuccessful, is this type of drive has alignment issues? If yes , why when i put the donor back it works fine, i tried this with 4 donors same problem.

Both patient and donor matched headpmap 0 1, however some donor have "default headmap" and some "from map"

Patient platter (single platter) seems to be fine, no scratches.

Could this be incompatible preamp or something else?

Thank's guys.

Attachments

[N.C.]

Hi,

I this case, i should replace only the preamp.

Of course after measure the MR sensors, and be sure, its working....

Janos

[TerraNova]

Replacing preamp? ummm thats a tricky one..MR sensor is good, i'll try preamp.

[Hexed]

Sounds strange. I would re-evaluate. Is the PCB proven good. Does the drive just click and then spin down or do the heads try to track. I would try the patient heads in all 3 donor drives. You may end up getting a hint as to what is going on.

[TerraNova]

PCB is good, the drive clicking continuosly 4 to 5 times then spin down. The head do not even try to track.

[networkpc3000]

hi,
yeah. i have partner have some case same as you. but drive is different. he's patient is 53 series. head is fine. swap won't help.

[TerraNova]

i will double check the platter under scope again, i might have missed something.

[TerraNova]

I found a tiny scratch on the platter. It is located on the outer edge of the platter, any hope?

Attachments

[N.C.]

As far as i know, usually, no drive have double errors.
You sad, your drive have preamp problem.
How can this scratch be?

Btw not looks like critical, but harder than without this. (+ money, if not you was who made it)

Janos

[TerraNova]

I forgot to mention, this drive was initially brought into a computer shop, top cover was removed.

[N.C.]

I forgot to mention, this drive was initially brought into a computer shop, top cover was removed.

Ahaa.
This is the point.
This little "mark" shows the heads was removed.
In this case, yon can't be sure, the patter is the original at all...

In this case i would give a big invoice for the client BEFORE i do anything, and if i get any of the data back, the another big invoice.

Janos

[beto]

Hello terranova we´re working on similar case WD800JD one platter 2 heads with some scratch´s at both surfaces, now can access some sector´s, contact me on MSN please im ver busy to check fourm

Best Regards

[TerraNova]

After long hours finally i got it working but not stable, clicking from time to time, many unreadable sectors, slow as hell .....and still cloning.....

[N.C.]

After long hours finally i got it working but not stable, clicking from time to time, many unreadable sectors, slow as hell .....and still cloning.....

Congratulation.

[TerraNova]

thanks to you too NC

[gbulger]

How did you get it to read? How did you do head alignment?

Thanks,
gb