ST Momentus

[acforensics]

Hi Gang,

I have a Seagate Momentus that I was able to partially image, then it appeared heads were going bad. I swapped the heads and now, the motor spins, but the headstack does not move. It moves freely however, just doesn't go into calibration mode. I checked and cleaned the connection from PCB to headstack, but no luck. I switch back to the old headstack and same thing - motor spins up, headstack stays still.

Any ideas?

Thanks!

[beto]

hello acforensic

Send us the terminal log to know whats happend

Best Regards

[acforensics]

Good point Beto. Here it is...


Interface task reset
4096k x 16 buffer detected
MERC2 - 1_Disk 0.02 12-
Buzz - 16-05 13:52
Head Mask 0F,01 - Head Mask 0F,05 - Head Mask 0F,06 - Head Mask 0F,07 - Head Mask 0F,08 -

then just repeats head mask text

Any ideas? Keep in mind that the heads are not even leaving the ramp.

A

[rchadwick]

If you power the drive while the cover is off, does the head stack feel stiff? Or does it still move freely? Perhaps the VCM driver IC is bad? Or maybe nicked the coil while swapping the heads?

[acforensics]

I thought that too, but I have tried both PCBs and both headstacks. Weird...

[rchadwick]

So both the problem happens with Both PCB's, and both head stacks? Maybe the original VCM was shorted, which might explain original problem, and it eventually took the driver IC with it?