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DRUG
 Post subject: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 4th, 2015, 13:24 
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Can anyone provide me with the NV-RAM file for this disk ?

USAG module also fails to read. :(


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drHDD
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 4th, 2015, 17:37 
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How we should find out which version of firmware you have in this drive?
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pcimage
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 4th, 2015, 18:52 
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NV-RAM is unlikely failure

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DRUG
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 4th, 2015, 20:09 
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I'm only going to be at office on monday, however I know its not arm type, the disk can't be ID'ed. When i try to scan I cant access any sector at all. However after this post i noticed C13 was missing from PCB at all. I'll get to you as soon as possible. All the modules I can read are 00. What kind of issue might this be?

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DRUG
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 7th, 2015, 6:13 
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Spildit wrote:
DRUG wrote:
I'm only going to be at office on monday, however I know its not arm type, the disk can't be ID'ed. When i try to scan I cant access any sector at all. However after this post i noticed C13 was missing from PCB at all. I'll get to you as soon as possible. All the modules I can read are 00. What kind of issue might this be?


What do you mean that all modules that you can read are 00 ? They are empty (no content at all) even if the MRT Tool states that it read sucessfuly ? Can you read NVRam and ROM ?


So i got back today, only to find out that:

All modules fail to read, ATA1 fails to initialize the device.

Can't load Teachkey, can't load NV-RAM, nothing.

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DRUG
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 7th, 2015, 14:14 
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Spildit wrote:
Were you able to read NVRAM to start with ?
Does your pcb have external ROM as well ?


No, I couldn't.

Yes it does.

Please pay attention to C33, it looks damaged.


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data-medics
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 7th, 2015, 14:31 
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Doesn't look damaged, it looks missing. :D

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jermy
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 7th, 2015, 14:43 
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so do it the old fashioned way... transfer the ROM chip or read the ROM with an external programmer
and like pcimage said
pcimage wrote:
NV-RAM is unlikely failure


Last edited by jermy on December 7th, 2015, 14:53, edited 1 time in total.

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dick
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 7th, 2015, 14:52 
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I have the same model drive here and the missing C33 capacitor is the same physical size as C11 but on my drive it is a darker brown colour. C11 is lighter brown colour. That may or may not be important.
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fzabkar
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 7th, 2015, 15:16 
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Measure the voltage between the pins of C33. If it is 18V or so, then it is the boost capacitor for the VCM servo.

FWIW, the L7250 SMOOTH datasheet specifies a 330nF VBOOST capacitor. I don't know whether the smaller capacitor to the left of C33 can cope on its own. If not, then I would expect instability in the servo.

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fzabkar
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 7th, 2015, 16:20 
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The headstack would probably still move, but it may not lock onto the track reliably. The boost voltage is required for controlling the drive to the high-side MOSFETs. The drive to the low-side MOSFETs would still be OK. I'm not completely certain, though.

In any case, I could be wrong about the function of C33. It may in fact be bypassing the +5V or +12V supply to the motor controller, in which case its absence would not be super critical. Perhaps dick could confirm the voltage on his PCB.

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dick
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 7th, 2015, 17:53 
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Happy to oblige.
So it measures 11.89v across the capacitor.
12v rail direct from the psu reads 11.94v
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fzabkar
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 7th, 2015, 18:12 
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It looks like C33 may be the bypass capacitor for the low frequency noise on the +12V supply. The smaller capacitor would then be filtering the high frequency noise. A continuity test between the +12V terminal of the capacitor and the +12V input to the PCB would confirm this beyond doubt.

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dick
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 8th, 2015, 4:05 
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fzabkar wrote:
It looks like C33 may be the bypass capacitor for the low frequency noise on the +12V supply. The smaller capacitor would then be filtering the high frequency noise. A continuity test between the +12V terminal of the capacitor and the +12V input to the PCB would confirm this beyond doubt.

As expected NO noticeable resistance was measured.
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DRUG
 Post subject: Re: HDT722525DLAT80 NV-RAM ERROR.
PostPosted: December 9th, 2015, 6:23 
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Well, I'll get a donor for some rom swap and hope that servo is stable.

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