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kotel
 Post subject: Hitachi deskstar HDS728040PLA320 - missing R3, no spin
PostPosted: November 1st, 2024, 5:56 
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Joined: April 2nd, 2024, 3:40
Posts: 167
Location: on lifes edge
Hi
While back I got an Hitachi deskstar HDS728040PLA320 drive. Powered it on but was greeting with nothing. No spin, no beeps. Doing a visual inspection I found an missing capacitor near motor controller and an R3 resistor which almost broke off (R3 is near R63). While trying to resolder that R3 I accidentally lost it. It was the no markings type so I can't go on google and find a picture of the PCB. Buying a new board isn't an option. Anybody knows what the specs of R3 might be?
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Zero Alpha
 Post subject: Re: Hitachi deskstar HDS728040PLA320 - missing R3, no spin
PostPosted: November 3rd, 2024, 21:59 
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Joined: April 7th, 2009, 21:36
Posts: 487
Post a clear picture please

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fzabkar
 Post subject: Re: Hitachi deskstar HDS728040PLA320 - missing R3, no spin
PostPosted: November 3rd, 2024, 22:35 
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Joined: September 8th, 2009, 18:21
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@kotel, if you can upload clear, hi-res photos of both sides of the PCB, especially in the affected area, I may be able to work out a suitable resistance value.

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kotel
 Post subject: Re: Hitachi deskstar HDS728040PLA320 - missing R3, no spin
PostPosted: November 4th, 2024, 13:32 
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Joined: April 2nd, 2024, 3:40
Posts: 167
Location: on lifes edge
Well, after replacing a missing cap near the motor controller, the disk spun up but now it is clicking. I think it may be the problem with that resistor being wrong resistance cause it connects to a pin on the heads assembly. (I measured the one near it and replaced it). Pictures in attachments.


Attachments:
IMG_20241104_182508_1.jpg
IMG_20241104_182508_1.jpg [ 329.2 KiB | Viewed 1798 times ]
File comment: Don't mind the resistor missing (it broke off). It was an I believe 4.7k (the THT resistor soldered near it is the spec of the one that broke off before I got around playing with the drive).
IMG_20241104_182614_1.jpg
IMG_20241104_182614_1.jpg [ 349.33 KiB | Viewed 1798 times ]
IMG_20241104_182517_1.jpg
IMG_20241104_182517_1.jpg [ 253.42 KiB | Viewed 1798 times ]
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fzabkar
 Post subject: Re: Hitachi deskstar HDS728040PLA320 - missing R3, no spin
PostPosted: November 4th, 2024, 14:39 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
Sorry, I was wrong. I can't help you.

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