Re: Daisy Wheel Printer repairs

So an update to this...

I managed to find a new old stock Qume Sprint 11, the OEM version of the DWP, locally on eBay. A few dollars later it was delivered to my door!

Before I took it apart I painted a pinwheel and made a couple slow motion videos of it printing.
Here's the built in self test: https://www.youtube.com/watch?v=djvOpJMppuc And a longer video printing a document:
https://www.youtube.com/watch?v=kTxC3__Xto4

It's amazing what you see in the slow mo video... how the printer uses speed control to move the carriage and platen as quickly as possible, and keep it in sync with the printwheel.

The parts printer was made in 1993, and the original belt was in good shape. There are a few wiring differences but I think I can make repairs to the Apple printer using its parts.

One problem I have now is that the reference photos I took of the wiring going to the carriage motor and lid switch are insufficient. There are two white wires, a red, and a black.

Here's some links to high res pictures I took. I can't tell where the red wire should be going... in one photo it looks like it goes right to the motor, in another it's plugged into the switch. Perhaps I misconnected it somewhere along the way?

https://lh3.googleusercontent.com/-KLHKWYvdO9g/VZx97NcKWxI/AAAAAAAAHqg/POLJZ0Olrog/s2048/IMG_20150214_184551.jpg

https://lh3.googleusercontent.com/-h2YU5xVsUN4/VZx5xN7CU_I/AAAAAAAAHqE/NkJXlH3Tr9U/s1024/IMG_20150220_162207.jpg

Could someone else with one of these machines take some notes or photos for me? I need to get this project finished and get the use of my desk back!

Thanks,

-Jason

On Sun, Mar 1, 2015 at 5:47 PM, Jason Perkins <perkins.jason_at_email.domain.hidden> wrote:

> Well, I don't have good news to report...
>
> I got the replacement belt in, but it seems my measurements were
> incorrect... the belt's tooth spacing seems to be in inches, not mm. The
> belt didn't line up well on the pulleys. Since both are damaged I was
> looking into finding replacements. The one on the drive motor has 20 teeth.
>
> Some more info about the drive motor: It's actually a DC motor, not a
> stepper motor. It has a glass graticule on the back and an encoder to sense
> rotation. Unfortunately as I was working on the motor I broke the graticule
> :(
>
>
> https://lh4.googleusercontent.com/-F7YQ8iB0apk/VPOVZoNaHCI/AAAAAAAAGVY/2dSJ6dDTmfo/s512/IMG_20150301_173657.jpg
>
> Not sure what I'll do at this point... the teeth on the graticule are so
> fine I'm not sure how I could get a replacement. Quite a disappointment. It
> took me quite a while to find one of these printers in the first place. I
> guess I'll keep my eyes peeled for another one or some other qume printer I
> could possibly rob the part from.
>
> Thanks,
>
> -Jason
>
> On Fri, Feb 13, 2015 at 12:20 AM, tommoni <tommoni_at_email.domain.hidden> wrote:
>
>> Hi Jason,
>>
>> I'm a bit shocked! No, not about you, but about the team or guy, who
>> "invented" the routine of parking the print-head.
>>
>> What a way to solve a problem by an engineer, whose idea lead to this:
>>
>> ... from the barbaric way the printer homes the print head... it runs it
>> all the way left until it hits a mechanical stop, stalling the motor!
>>
>>
>> We should all be glad, that this company never invented medical equipment
>> for humans :-)
>>
>> But apart from that, I'm keen on getting more information about your
>> printer, when you got it repaired. Perhaps you should decide to replace the
>> plastic part, too? It should not be a complex part, when 3D-printing it...
>> ... although, then it's not origin anymore.
>>
>> greetings Tom from Bavaria
>>
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>
>
>
> --
> Jason Perkins
> 313 355 0085
>

-- 
Jason Perkins
313 355 0085

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