Re: 1541-Newtronics mechanism problem

From: RayBryan (
Date: 2008-01-18 21:01:34

On Jan 16, 2008, at 2:01 PM, Pete Rittwage wrote:

>> I have wrestling with a drive repair for weeks now.  I thought I had
>> it all fixed; it was reading the Dysan 224a alignment (analog)
>> diskette (Commodore 970016 01 48 TPI alignment diskette) with sine
>> wave tracks on 16 & 18 and 34 (according to Dysan docs) and so it
>> then passed the all the Commodore Consumer Diag V2 tests except the
>> #7 test to fast format and write then read selected tracks (well it
>> did pass that test with one of the F15 scratch disks).  But it would
>> not format a floppy always reporting 21 read error 00 00.   I tried
>> then formatting with 3 more Newtronics drives and got that same
>> response.
>> Is this a common and well known problem with Newtronics?
>> The Commodore 1541 Service Manual PN 314002-01 does not document this
>> behaviour or symptomology (of course it is November 1985 but has some
>> added pages released later).
>> What about the program called "Alps drive check and
>> alignment" (program 970127.D) on the C.D. V2 disk as "Disk Alignment"
>> -41 blocks- is/was there a program called "Newtronics drive check and
>> alignment"?
> A lot of times trying to align some of those old mechs is futile.   
> You can
> get it perfectly aligned to 18, 1, and 34, then the next time it  
> bumps the
> heads it's off a track again.
> Pete
When that happens you have to replace the set screw on the stepper  
motor shaft ie. the stepper shaft is slipping inside the collar that  
connects to the band that moves the r/w head.  ( I am not convinced  
yet that that is the problem here.Mycroft Holmes said that "eliminate  
all the possibilties..." before accepting the improbable. )

|Raymond C. Bryan  651-642-9890 vox      | The battle is sometimes |
|Raymond Computer  651-642-9891 fax      | to the small for        |
|795 Raymond Ave   -email:  raycomp      | the bigger they are     |
|St Paul MN  55114          | the harder they fall.   |
|USA              Amiga - Commodore      |     -- James Thurber -- |

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