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How to disassemble a Panasonic JU-253 floppy drive?

JU-253 disassembly

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#1 OLD CS1 OFFLINE  

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Posted Thu Jan 18, 2018 11:38 PM

The JU-253 floppy drive in my 1581 failed.  It has a hard time starting the spindle motor even though it spins freely. It appears a small cap on the drive board as leaked, which is apparently a common failure for a similar model.

 

The problem is I cannot get the bloody thing apart.  It appears the retaining spikes inside the floppy guide and holding mechanism are pressure fit into the chassis.

 

This drive is used in both Amiga computers and Commodore 1581 disk drive, so I am posting here rather than crossing in both the Commodore and Amiga subs.

 

Does anyone know how to get this thing apart?  It has been a very reliable (long-lived, anyway, until, well, you know, it failed) and QUIET drive and I would like to bring it back to life.



#2 0078265317 OFFLINE  

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Posted Sat Jan 20, 2018 11:27 AM

Don't know just get another used floppy drive.

 

https://www.ebay.com...iIAAOSwbtNaTaNa

 

https://www.ebay.com...iIAAOSwbtNaTaNa

 

https://www.ebay.com...4YAAOSwTmtaCMhF



#3 OLD CS1 OFFLINE  

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Posted Sun Jan 21, 2018 12:40 AM

Thanks but the purpose of my exercise is to repair this unit if possible and thus that is the information I need, not pointers in a different direction.

 

Using a standard PC floppy drive requires modification which is not my gig.  Plenty of other people are doing modifications but so far as I can tell the JU-256 has no modifications to use.

 

Correction: a JU-256 modification is here and it looks pretty straight forward.  The settings on the JU-253 are similar but the -253 is a DD drive where the -256 is n HD.  Interesting, but not the direction I plan to go.



#4 OLD CS1 OFFLINE  

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Posted Sun Feb 4, 2018 5:06 PM

I put a little turbine oil on the spindle on the under-side of the drive and pushed the spindle around a few times while watching some videos.  Then reassembled the 1581 resting it up-side down and have been running non-stop drive operations to keep the motor running.  So far it is going without a problem.

 

I did notice, however, at the front of the drive an SMD cap appears to have leaked.  There is no way to easily get to this component since the drive is resistant to disassembly so this might be a moot issue within a short time.  I will clean the leakage and corrosion as much as possible, at least.



#5 OLD CS1 OFFLINE  

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Posted Sun Feb 4, 2018 6:57 PM

That was short-lived.  So long as the motor stay running all is fine, but as soon as it stops it cannot start again on its own.

 

Bummer.







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