Hi Pepe, today i replaced MHA and exactly the same problem. This drive is really the Devil's drive but i will not give up

have U tried the patient MHA in the donor drive? just to check if it is OK or not...
pepe

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Adatmentés - Data recovery

yes Pepe after replaced the MHA over it had same problem, so i took the original ( we thought faulty) MHA and placed to good donor and the head works fine. Could it be the READ channel chip? All other chip warm except this one.

since U used the donor PCB I suppose with the donor heads in the patient, I don't think read channel could be the cause here.
What I think is that writing was turned on when the PCB or the preamp damaged, so there is no servo as well as data left on the platter...
I had such experience at least twice...

pepe

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Adatmentés - Data recovery

You know one thing i love doing data recovery is when successful i get a sense of "Multiple Orgasm" YES sometimes better than sex

Finally the drive is working and data copied.

All credit goes to all who posted in this forum, thank you all, especially PEPE who gave a great help in tourbleshooting and guidance.

Thank you guys.

Solutions:
Apparently the Head is not completely dead but for some reason failed, after following Pepe's adviced i remove faulty head and ROM and the drive works perfectly, yes the old PCB is faulty.