This model only interesting in cases when original heads are working, but can't read one of two surfaces (if hdd has 2 heads). And you can try any matching DCM heads and try any lid adjustments - it doesn't help to read bad surface - head just clicking.
Pepe opinion is servo gone, so there is no way how to read data. I thought same thing, until I got two cases where I was able to read some data by about 70th tried set of heads.
If you are talking about just bad heads and you were able to read data by 1st-5th set of heads - it's not case what I am talking about.
PS I can change only one head on seagate DM set of heads and it will work, so believe me I can find out where just bad or incompatible head and where something more complicated than that.

drHdd, in reply to my question if u were able to clone such drive 100% you wrote:

so i think there WAS servo damage OR the above mentioned PCB issues played their role sometimes, don't you think?



It is only 50% true, if the servo is gone, it affects mostly the inner half of the platter, the outer areas might survive. It poses a second problem: how to read that first half (solved of course)

As for DM series, I love them because everybody hates them Hotswap rulez... there are absolutely no MHA compatibility problems either... Hey, what is MHA compatibility anyway?

Jono: most recent boards use thinner traces than the 1335 used, trace width is not a major issue in this situation, whoever might have told you that.

i never said lid alignment is not working, i said there are other, more exact ways to get around the problem. The same is true for using 10+ donor heads. It probably works, but time consuming.
These are the most used methods, however if u ask people WHY and HOW they work, very few will be able to tell you the reason.

pepe

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Adatmentés - Data recovery

Okay, next time, I will send similar case to you. It's better than play with 70th head sets. Of course if price will be reasonable.