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 Post subject: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 10th, 2019, 13:35 
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Joined: May 9th, 2017, 11:33
Posts: 140
Motor winding resistance is the same between each pair of pads on the motor power lines.

Rotor is moving freely. So no motor issue.

With isolated heads would still not spin. So it can't be the HDA.

On pcb inspection i don't see any burnt components.

I tried with diffrent rom versions but would not spin.

CPU gets warm. No voltage on motor power lines.

What could it be?


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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 10th, 2019, 14:34 
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Joined: October 10th, 2019, 14:31
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Dead PreAmp on HDA maybe ?


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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 10th, 2019, 14:54 
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Measure the resistances between ground and pins 1, 4 and 6 at the HDA connector. These are the preamp's power pins.

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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 11th, 2019, 0:14 
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Joined: December 13th, 2008, 13:35
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Location: Los Angeles, CA USA
Try PCB swap.

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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 11th, 2019, 1:41 
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MasterT wrote:
I tried with diffrent rom versions but would not spin.

Your PCB's external ROM (U12) is unpopulated, so did you replace the PCB, or did you reprogram the MCU's internal ROM?

Be aware that your MCU (88i6745) is known for "head mimic" faults.

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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 11th, 2019, 4:19 
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cpm1993 wrote:
Dead PreAmp on HDA maybe ?


With isolated heads would still not spin. So it can't be the HDA.

fzabkar wrote:
Measure the resistances between ground and pins 1, 4 and 6 at the HDA connector. These are the preamp's power pins.


pin 1 = 2.2 ohm
pin 4 = 335.5 Kohm
pin 6 = 18.16 kohm

bcometa wrote:
Try PCB swap.


I don't have one like this and time is of the essence.

I could order one pretty cheap but it takes a week to get to me.

fzabkar wrote:
MasterT wrote:
I tried with different rom versions but would not spin.

Your PCB's external ROM (U12) is unpopulated, so did you replace the PCB, or did you reprogram the MCU's internal ROM?

Be aware that your MCU (88i6745) is known for "head mimic" faults.


You are right. I reprogrammed MCU's internal ROM with different fw versions because i thought maybe pcb was swapped and incorrect fw it the cause for not spinning.

Can someone confirm that WD7500AAKS-00RBA0 goes with pcb 2060-701474-002?

It could be entirely different pcb with different MCU.

Drive has been to a computer repair shop before, and they are notorious for trying pcb swaps.

Thannks.


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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 11th, 2019, 4:25 
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I have same experience
Probably short circuit connectors.

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Last edited by HddDonorMarket on October 11th, 2019, 4:28, edited 1 time in total.

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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 11th, 2019, 4:27 
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Location: Los Angeles, CA USA
Quote:
Can someone confirm that WD7500AAKS-00RBA0 goes with pcb 2060-701474-002?


Confirmed. Easiest (maybe not quickest) solution will probably be PCB swap + ROM recovery/rebuild.

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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 11th, 2019, 4:33 
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Joined: May 9th, 2017, 11:33
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HddDonorMarket wrote:
Attachment:
20190206_224406.jpg

I have same experience
Probably short circuit connectors.


I don't think there are short circuit connectors. Voltages on pcb seem right.

I don't see anything burnt like in your case.

I also checked all capacitor and none has a short to ground.

bcometa wrote:
Quote:
Can someone confirm that WD7500AAKS-00RBA0 goes with pcb 2060-701474-002?


Confirmed. Easiest (maybe not quickest) solution will probably be PCB swap + ROM recovery/rebuild.


Thank you for confirmation. I'll just order the pcb and see how it works.


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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 11th, 2019, 5:51 
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Joined: June 16th, 2018, 12:09
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Location: Turkey
Then Wring PCB or ROM my guess too

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 Post subject: Re: WD7500AAKS-00RBA0 not spinning.
PostPosted: October 24th, 2019, 5:50 
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Joined: May 9th, 2017, 11:33
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Donor PCB + Original ROM = 100 % Sucess


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