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 Post subject: WD30EFRX-68AX9N0 strange problem (for me)
PostPosted: April 25th, 2018, 15:14 
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Joined: December 6th, 2012, 8:49
Posts: 196
Location: españa
when connected, the disc rotates for a few seconds then stops, then rotates again and so on.

I have had similar cases before that were solved with a change of pcb, but this particular case leaves me with no options.......

patient disc + pcb donor + patient rom ----> same result (spin up/down constantly) ------> discard pcb problems

patient disc +pcb donor + rom donor ---> same result ----> discard corrupt rom problems

Isolated head contacts ---> same result ---> would rule out preamplifier or head problems

Am I missing something??

motor damage???.... but it would be the first case I see in this series and even less when it turns (not blocked).

Has anyone ever had this happen to you? And most importantly, what was the solution?? :D


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 Post subject: Re: WD30EFRX-68AX9N0 strange problem (for me)
PostPosted: April 25th, 2018, 15:28 
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colanco wrote:
when connected, the disc rotates for a few seconds then stops, then rotates again and so on.

Isolated head contacts ---> same result ---> would rule out preamplifier or head problems

How does a working drive behave when you isolate its HDA?

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 Post subject: Re: WD30EFRX-68AX9N0 strange problem (for me)
PostPosted: April 25th, 2018, 15:56 
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fzabkar wrote:
colanco wrote:
when connected, the disc rotates for a few seconds then stops, then rotates again and so on.

Isolated head contacts ---> same result ---> would rule out preamplifier or head problems

How does a working drive behave when you isolate its HDA?

hello fzabkar, your opinions are always welcome, thank you

I know, it doesn't make sense, but it does exactly the same thing, it turns and stops turning after a few seconds, turns again, stops again........

It's haunted!!!!!!!


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 Post subject: Re: WD30EFRX-68AX9N0 strange problem (for me)
PostPosted: April 25th, 2018, 16:15 
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It appears that the firmware is designed to spin up the drive and then check the preamp, in which case ISTM that the preamp/headstack must be faulty.

You might like to compare the resistances between ground and each of the preamp supply test points (+5V & -5V). You could also measure the voltages at the HDA contacts, eg the read channel test points (TV9 & TV10).

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 Post subject: Re: WD30EFRX-68AX9N0 strange problem (for me)
PostPosted: April 25th, 2018, 16:24 
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Joined: December 6th, 2012, 8:49
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fzabkar wrote:
It appears that the firmware is designed to spin up the drive and then check the preamp, in which case ISTM that the preamp/headstack must be faulty.

You might like to compare the resistances between ground and each of the preamp supply test points (+5V & -5V). You could also measure the voltages at the HDA contacts, eg the read channel test points (TV9 & TV10).


In WD the usual is the opposite, first check the preamp and then spin up, that's why I discarded preamp or head problems, but as I don't believe in witches, I'll do the checks.

Thank you fzabkar


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 Post subject: Re: WD30EFRX-68AX9N0 strange problem (for me)
PostPosted: April 25th, 2018, 16:51 
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I would vote for damaged pre-amp / head(s).

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 Post subject: Re: WD30EFRX-68AX9N0 strange problem (for me)
PostPosted: April 25th, 2018, 17:09 
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Spildit wrote:
I would vote for damaged pre-amp / head(s).


Yes, it is most reasonable, PCB and Rom are discarded and the motor is very unlikely, there are few options,

What I don't understand is the reason for the continuous spin attempts,


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 Post subject: Re: WD30EFRX-68AX9N0 strange problem (for me)
PostPosted: April 25th, 2018, 17:09 
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Spildit wrote:
I would vote for damaged pre-amp / head(s).


That’s what it is.

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