Angry 800K Sony MP-F51W-23

[sutekh]

I purchased a dirty and untested Sony 800K mp-f51w-23 (I think it came out of an SE) as an internal drive replacement for my 512K (which is running Plus ROMs and a MacSnap).
 

After thoroughly going through it and cleaning / re-lubricating, the carriage movement is nice and smooth, but when connecting and powering, the head movement stepper motor just runs continuously:


View attachment Project 1_New.mp4





I didn't test it before before disassembly, so not sure if this was a pre-existing condition or not. I DID modify the ribbon cable that came with the drive by removing pin 9 and 20, thereby simulating the yellow striped cable a Plus would need for this type drive.

I'm thinking the drive controller is probably cooked, but before trying to source another one, figured I'd see if anyone had seen something similar before and resolved?

 

[Franklinstein]

I thought yellow was for 400k and red for 800k drives with Plus ROMs. Maybe try a normal red-striped cable?

 

[JDW]

If you look at 47:06 in my video below, you will see the optical sensor on my 800K drive is marked N 222 89:

https://youtu.be/sy6JWEerHQc?t=2826

Please use compressed air or several squeezes of a rubber rocket blaster to ensure there is nothing blocking the inside of that optical sensor on your drive.  Use a magnifying glass to inspect after you blow it out.  There is a similar problem on 400K drives called "the click of death."  Once the sensor is properly cleaned, assuming the sensor itself is not bad, the problem should go away.

 

[sutekh]

I thought yellow was for 400k and red for 800k drives with Plus ROMs. Maybe try a normal red-striped cable?

That just leads to it trying to permanently eject. All 20 pins are connected in a red stripe, 9 and 20 are missing with yellow, which is what the 800K drive needs for use with a plus. There are a few posts here with pics documenting the differences. Using the cable I modified by removing 9 & 20 from the ribbon, stops the eternal eject, but the above problem persists.
 

If you look at 47:06 in my video below, you will see the optical sensor on my 800K drive is marked N 222 89:

https://youtu.be/sy6JWEerHQc?t=2826

Please use compressed air or several squeezes of a rubber rocket blaster to ensure there is nothing blocking the inside of that optical sensor on your drive.  Use a magnifying glass to inspect after you blow it out.  There is a similar problem on 400K drives called "the click of death."  Once the sensor is properly cleaned, assuming the sensor itself is not bad, the problem should go away.

Thanks! I hit that with some iso and compressed air to no avail. Also, If I remove the bar and slide mechanism, then attempt to block the optical sensor, it seemingly has no effect--the motor just runs indefinitely. Bad sensor or logic board perhaps?

 

[techknight]

Did you look at the sensor through an IR camera? 

LEDs fade with time and that could present an issue if it has fallen below the photodetectors threshold. 

 

[JDW]

Did you look at the sensor through an IR camera? 

LEDs fade with time and that could present an issue if it has fallen below the photodetectors threshold. 

@techknight Offers some great advice here.  I really feel the root problem is that IR sensor because that sensor is there to keep the head motor from repeatedly moving in the same direction endlessly.

Also, sorry for my delayed reply, but I am back to not getting email notifications for thread updates again.  Very frustrating!