RE: 1541 II Belt Drive

Ray, 

Thanks for the reply... I've found tons of alignment/speed info on the
original 1541's. just none on the 1541 II and 1541C. 

-----Original Message-----
From: owner-cbm-hackers@ling.gu.se [mailto:owner-cbm-hackers@ling.gu.se] On
Behalf Of RayBryan
Sent: Sunday, October 11, 2009 18:10
To: cbm-hackers@ling.gu.se
Subject: Re: 1541 II Belt Drive

On Oct 11, 2009, at 3:29 PM, Ruud@baltissen.org wrote:

> Hallo Scott,
>
>
>> I've looked high and low for directions on alignment and setting
>> the speed on a 1541 II drive but have had no luck.
>
> It may sound a bit weird but I haven't any idea for the simple
> reason I never had alignment or speed problems. And if I have, I
> will try Google and comp.sys.cbm first.
>
some of the drive mechanisms have a little timing disk on the bottom  
of the flywheel - if yours does not:
Pg 33 of SAMs Commodore 1541 Trouble shooting & repair guide Michael  
Peltier (I have several copies in stock) - there is a little picture  
fo the wheel that you need - xerox that page cut the wheel out and  
paste it on the underside of the mech's flywheel use a flourescent  
light - put a pointer (pen,pencil, screw driver) along side the  
flywheel and see if the calibrated disk stays steady by the pointer  
or precesses/postcesses.  there is a pot on the motor control board  
to adjust the speed if the disk is not stay by the pointer.

I only know how to do the alignment with the analog calibration  
floppy diskette and an ocilloscope on the input pins of the video  
amplifiers (chips on the drive's PCB) (got this from a different  
manual including a basic listing for stepping the head in/out while  
spinning the diskette.)

--Ray

---------------------------------------------------------------
|Raymond C. Bryan  651-642-9890 vox      | The battle is sometimes |
|Raymond Computer  651-642-9891 fax      | to the small for        |
|2402 University Ave   -email:  raycomp      | the bigger they are     |
|St Paul MN  55114    @visi.com          | the harder they fall.   |
|USA              Amiga - Commodore      |     -- James Thurber -- |
http://www.raymondcomputer.com
---------------------------------------------------------------





       Message was sent through the cbm-hackers mailing list


---
avast! Antivirus: Inbound message clean.
Virus Database (VPS): 091011-0, 10/11/2009
Tested on: 10/11/2009 6:34:20 PM
avast! - copyright (c) 1988-2009 ALWIL Software.
http://www.avast.com





---
avast! Antivirus: Outbound message clean.
Virus Database (VPS): 091011-0, 10/11/2009
Tested on: 10/11/2009 7:08:18 PM
avast! - copyright (c) 1988-2009 ALWIL Software.
http://www.avast.com




       Message was sent through the cbm-hackers mailing list