i got this drive and the head is stuck.. fix done
but it can't spin. then i try to test the PCB, no output power from 4 point that connect to the motor.
i search for the donor and got it. all are same only SN is different.

i am not sure that i can just swap the PCB or not. i heard that i must solder and unsolder ROM Chip or CPU.
can you help me which one the ROM that i must unsolder n solder to donor pcb.
no. 1 or no. 2


thanks before

It's #1. You're lucky . . .

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thanks jono. i will try it..

Hi,

How did you measured this?
The spindler is servo motor, not working with DC power.

Regards,
Janos

i measure from the pcb. not from the drive.

Did you use oscilloscope?

Janos

you can either use oscilloscope or dmm, but best is oscilloscope.

hardly anyone knows what a oscilloscope


if im right number two chip is a bga type you wont be able to remove
as the solder is under the chip itself so no pins are shown




special tools can remove that chip like what we use

tried it and succeeded. thanks to jono-ats.



i use multimeter, use a dc tester.



the bga chip can be remove using blower or infrared solder.

yes correct but a lot of people just use a blower or painter stripper heat gun

which can damaged the ic again you wont get the perfect connectiong

infrared solder is what we use