CX065B again (was Re: Osborne Executive CRT circuitry)

Glen Goodwin acme_ent at bellsouth.net
Fri Feb 24 10:04:04 CST 2006


Tony --

After a little digging I found a datasheet for
the NTE replacement for CX065B in PDF format.

If you'd like I can email it to you or print it
out and snail-mail it.

Glen
0/0

Tony Duell wrote:
> The Epson motor is very different to the Commodore one. Commodore used a 
> permanent magnet DC motor, the Epson drive uses a 4 phase motor with 
> electronic commutation (there are 2 hall sensors under the PCB). It's 
> just the speed controller chip that's the same/
> 
> 
>>Not offhand.  The only time I ever really encountered any serious speed 
>>problems with those motors was when the tach winding opened up,  and they'd 
> 
> 
> That problem I've got. I've taken the motor housing apart, and have tried 
> to repair the coil. Time will tell...
> 
> 
>>run at full-speed with no regulation.  I do have the manuals for the 1541 in 
>>the other room,  and can take a look...
> 
> 
> I have the ofifical Commodore manual, so if that's what you have there's 
> no need for you to look.
> 
> 
>>I have had speed control chips fail on a small number of occasions,  but don't 
>>recall whether this  was one of the numbers or not.  Usually if you're 
>>getting a good waveform off the tach winding and power to the chip,  and no 
>>control coming out,  that's the problem -- it's been either the motor or the 
> 
> 
> Sure...
> 
> 
>>chip in those cases,  not much else in there.
> 
> 
> See above, the Epson motor is a lot more complicated. There's the chip 
> and 10 discrete transistors on the PCB.
> 
> For interest I'd like to know exactly what the chip does (I am curious 
> like that...). I'd also like to know just what the 'other' preset on the 
> Epson board is for (not the one that sets the speed), it seems to balance 
> the 2 hall sensors or something like that.
> 
> 
>>What sort of a problem are you having?
> 
> 
> Initially an open FG coil, let's hope I can get that right...
> 
> -tony
> 



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