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 Post subject: HITACHI HDT721050SLA360 is spinning but HSA doesn't move
PostPosted: March 17th, 2013, 13:53 
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Joined: February 23rd, 2012, 8:57
Posts: 19
Location: Poland
Hello to all,
Just like mentioned in the subject of the post my HITACHI HDT721050SLA360 is spinning but I can't hear the sound of HSA.
I am not sure but I suppose that maybe it's not full spin that's why HSA is not ready to move over the platters.
Is there a possibility to connect this drive to COM terminal or check the current RPM of drive in any possible way?
I checked PCB (measuring voltages) according to the post:

hitachi-hdt721010sla360-not-spinning-tvss-t21878.html

I am thinking about buying and replacing PCB.
Any more ideas?


Attachments:
File comment: Voltage input: 5,07V; 11,90V
Q2 (from left) 3,26V; 5,04V; 3,90V
L1 -4,95V
L3 5,07V
L300 1,08V
L310 2,50V
DC Motor 5,91V for each
IMG_0890pom.JPG
IMG_0890pom.JPG [ 90.86 KiB | Viewed 7520 times ]
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jono-ats
 Post subject: Re: HITACHI HDT721050SLA360 is spinning but HSA doesn't move
PostPosted: March 17th, 2013, 13:57 
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Joined: June 8th, 2006, 19:44
Posts: 3144
Location: Atlanta, GA
Sometimes this is a symptom of bad heads with media damage.

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pcimage
 Post subject: Re: HITACHI HDT721050SLA360 is spinning but HSA doesn't move
PostPosted: March 17th, 2013, 14:04 
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Joined: November 29th, 2006, 10:08
Posts: 7864
Location: UK
jono-ats wrote:
Sometimes this is a symptom of bad heads with media damage.


Agreed. See this often.

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poehere
 Post subject: Re: HITACHI HDT721050SLA360 is spinning but HSA doesn't move
PostPosted: March 17th, 2013, 14:58 
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Joined: February 27th, 2009, 3:26
Posts: 1721
Location: French Polynesia Tahiti
jono-ats wrote:
Sometimes this is a symptom of bad heads with media damage.

3rd this one

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Iorana Haraharaini
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USER
 Post subject: Re: HITACHI HDT721050SLA360 is spinning but HSA doesn't move
PostPosted: April 15th, 2013, 6:36 
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Joined: February 23rd, 2012, 8:57
Posts: 19
Location: Poland
Problem solved,
PCB and ROM replaced.
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pcimage
 Post subject: Re: HITACHI HDT721050SLA360 is spinning but HSA doesn't move
PostPosted: April 15th, 2013, 9:42 
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Joined: November 29th, 2006, 10:08
Posts: 7864
Location: UK
Well done, nice result.

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fzabkar
 Post subject: Re: HITACHI HDT721050SLA360 is spinning but HSA doesn't move
PostPosted: April 15th, 2013, 10:17 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
That's a very curious fault. :?

Do you still have the original PCB?

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USER
 Post subject: Re: HITACHI HDT721050SLA360 is spinning but HSA doesn't move
PostPosted: April 20th, 2013, 8:33 
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Joined: February 23rd, 2012, 8:57
Posts: 19
Location: Poland
I don't have original PCB right now, but I could if it is important.
Some idea?
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fzabkar
 Post subject: Re: HITACHI HDT721050SLA360 is spinning but HSA doesn't move
PostPosted: April 23rd, 2013, 18:45 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
Could it have been as simple as a dry solder joint at the NVRAM?

If the drive wasn't able to get up to speed, wouldn't it eventually have spun down?

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