WD400BB-00CAA0 problem

[TerraNova]

Hi guys

Drive is clicking continuosly and then safemode, pcb ok. I tried head exchange so far i have no luck, may be due to alignment or incompatible preamp. I put all the donor's head back to the original HDD and it works, so i guess alignment issue is ruled out. Single platter drive, surface ok.

So far i have tried 4 donors without any luck. Any help much appreciated.

[Zero Alpha]

So drive has 2 heads and you can't get SA with either of them?

[TerraNova]

no, the drive not even calibrated.

[granaryloaf]

Are you waiting for the drive to allow SA access, or are you gently persuading it to do so?

Have you got another working drive of the same family?

[Zero Alpha]

no, the drive not even calibrated.

Did you do a good test of the pcb? This should always be done first before opening.

[Russwinters]

Indeed, What have you done to insure the PCB is "ok"

I have seen plenty of WD where the PCB may seem ok at first, but maybe R/W Channel or MCU is having problems, corrupting data being read by the heads, causing the same clicking effect.