Homebrew PCBs

I got most of the mechanicals out of the way now and decided to put 
it back together where I can to check to see if it will work still.  
I got everything wired back up and power it up.  It seems to do fine 
for a while - you hear it doing it's usual cleaning - the main 
feeder shaft seems to rotate the right direction etc.

However, when it finishes that up, The "Paper" LED blinks and both 
inks show as being empty.  I don't have this printer connected to a 
computer at the moment so that could be partially the problem - not 
sure either way.

There is one thing I have to remove and this too could be the 
problem.  The paper feeder has an opto sensor on it to detect the 
position of a shaft (the one that holds the cams to feed the paper 
in).  This sensor is NOT the paper "leading edge" sensor.  I have 
tried to manual rotate that shaft so the sensor can "see" through 
the hole and so that it is blocked - same errors either way.

Anyone have any suggestions - I am all ears .

Thanks

Chris

I had something like that on the C84.

On mine, that sensor is a 'paper present in paper path' sensor, not a 'paper
ready for feeding' sensor.  Does that make sense?

I remember having problems testing the C84, my initial reaction was to
trigger this sensor, that gave me an error.

Robert
:)

> -----Message d'origine-----
> De : Homebrew_PCBs@yahoogroups.com 
> [mailto:Homebrew_PCBs@yahoogroups.com] De la part de lcdpublishing
> Envoyé : avril 24 2006 14:58
> À : Homebrew_PCBs@yahoogroups.com
> Objet : [Homebrew_PCBs] Epson 850 - getting closer but now 
> have an error problem?
> 
> 
> I got most of the mechanicals out of the way now and decided to put 
> it back together where I can to check to see if it will work still.  
> I got everything wired back up and power it up.  It seems to do fine 
> for a while - you hear it doing it's usual cleaning - the main 
> feeder shaft seems to rotate the right direction etc.
> 
> However, when it finishes that up, The "Paper" LED blinks and both 
> inks show as being empty.  I don't have this printer connected to a 
> computer at the moment so that could be partially the problem - not 
> sure either way.
> 
> There is one thing I have to remove and this too could be the 
> problem.  The paper feeder has an opto sensor on it to detect the 
> position of a shaft (the one that holds the cams to feed the paper 
> in).  This sensor is NOT the paper "leading edge" sensor.  I have 
> tried to manual rotate that shaft so the sensor can "see" through 
> the hole and so that it is blocked - same errors either way.
> 
> Anyone have any suggestions - I am all ears .
> 
> Thanks
> 
> Chris
> 
> 
> 
> 
> 
> 
> 
> Be sure to visit the group home and check for new Links, 
> Files, and Photos: http://groups.yahoo.com/group/Homebrew_PCBs
> 
> If Files or Photos are running short of space, post them 
> here: http://groups.yahoo.com/group/Homebrew_PCBs_Archives/ 
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
>

lcdpublishing wrote:

>There is one thing I have to remove and this too could be the 
>problem.  The paper feeder has an opto sensor on it to detect the 
>position of a shaft (the one that holds the cams to feed the paper 
>in).  This sensor is NOT the paper "leading edge" sensor.  I have 
>tried to manual rotate that shaft so the sensor can "see" through 
>the hole and so that it is blocked - same errors either way.
>  
>

  The paper edge sensor may be expected to go active after a certain 
time from the paper pick up sensor.  The paper pick up roller picks up, 
paper curls around, then the paper edge/present sensor goes active.  If 
you don't get it around the time the printer expects after the first 
sensor, the printer may give an error, seeing that it didn't really pick 
up a piece of paper when it thought it did..  IOW in some printers these 
sensors aren't independent and just for their job, it is expecting a 
certain chain of events with pretty specific timing along the paper path 
or gives a feed error or similar.  So you may have to move the pick up 
roller or fake the signal back along the straight path far enough to 
have the right timing.

Alan

Hmm, having only two sensors, I tried all the combinations about 5 
times and it still powers up in "error Mode".  It thinks there is a 
paper jam according to the manual.  I also tried connecting my 
computer to it - can't find a driver to work with XP either!

They have it for win3.1, 95, 98, me, NT, and 2000 but not XP - GRRRR!

I used the Windows driver for it but I don't think that will work 
out in the long run.

Either way, that didn't correct the error problem either.





--- In Homebrew_PCBs@yahoogroups.com, Robert Hedan 
<robert.hedan@...> wrote:
>
> I had something like that on the C84.
> 
> On mine, that sensor is a 'paper present in paper path' sensor, 
not a 'paper
> ready for feeding' sensor.  Does that make sense?
> 
> I remember having problems testing the C84, my initial reaction 
was to
> trigger this sensor, that gave me an error.
> 
> Robert
> :)
> 
> 
> 
> 
> 
> > -----Message d'origine-----
> > De : Homebrew_PCBs@yahoogroups.com 
> > [mailto:Homebrew_PCBs@yahoogroups.com] De la part de 
lcdpublishing
> > Envoyé : avril 24 2006 14:58
> > À : Homebrew_PCBs@yahoogroups.com
> > Objet : [Homebrew_PCBs] Epson 850 - getting closer but now 
> > have an error problem?
> > 
> > 
> > I got most of the mechanicals out of the way now and decided to 
put 
> > it back together where I can to check to see if it will work 
still.  
> > I got everything wired back up and power it up.  It seems to do 
fine 
> > for a while - you hear it doing it's usual cleaning - the main 
> > feeder shaft seems to rotate the right direction etc.
> > 
> > However, when it finishes that up, The "Paper" LED blinks and 
both 
> > inks show as being empty.  I don't have this printer connected 
to a 
> > computer at the moment so that could be partially the problem - 
not 
> > sure either way.
> > 
> > There is one thing I have to remove and this too could be the 
> > problem.  The paper feeder has an opto sensor on it to detect 
the 
> > position of a shaft (the one that holds the cams to feed the 
paper 
> > in).  This sensor is NOT the paper "leading edge" sensor.  I 
have 
> > tried to manual rotate that shaft so the sensor can "see" 
through 

> > the hole and so that it is blocked - same errors either way.
> > 
> > Anyone have any suggestions - I am all ears .
> > 
> > Thanks
> > 
> > Chris
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > Be sure to visit the group home and check for new Links, 
> > Files, and Photos: http://groups.yahoo.com/group/Homebrew_PCBs
> > 
> > If Files or Photos are running short of space, post them 
> > here: http://groups.yahoo.com/group/Homebrew_PCBs_Archives/ 
> > Yahoo! Groups Links
> > 
> > 
> > 
> >  
> > 
> > 
> > 
> >
>

Yeah, I think you are on the right track there - it is a timing 
issue of some sort I think.  I don't think it has to do with the 
leading edge detector though.  I don't recall this printer every 
picking up a piece of paper and having it ready to print during 
power up.  Rather, the only time paper is picked up is when it is 
suppose to print something.

It has to be something silly with that other sensor on the feeder.  
I will have to watch the gear train to see what it is doing and try 
to "open/close" the switch in sequence to that gearing and see if 
that helps.




>   The paper edge sensor may be expected to go active after a 
certain 
> time from the paper pick up sensor.  The paper pick up roller 
picks up, 
> paper curls around, then the paper edge/present sensor goes 
active.  If 
> you don't get it around the time the printer expects after the 
first 
> sensor, the printer may give an error, seeing that it didn't 
really pick 
> up a piece of paper when it thought it did..  IOW in some printers 
these 
> sensors aren't independent and just for their job, it is expecting 
a 
> certain chain of events with pretty specific timing along the 
paper path 
> or gives a feed error or similar.  So you may have to move the 
pick up 
> roller or fake the signal back along the straight path far enough 
to 

> have the right timing.
> 
> Alan
>

That is one reason why I put the paper feeder back on the printer.

I wanted to learn the proper sequence of paper feeding.

Robert
:)

> -----Message d'origine-----
> De : Homebrew_PCBs@yahoogroups.com 
> [mailto:Homebrew_PCBs@yahoogroups.com] De la part de lcdpublishing
> Envoyé : avril 24 2006 17:22
> À : Homebrew_PCBs@yahoogroups.com
> Objet : [Homebrew_PCBs] Re: Epson 850 - getting closer but 
> now have an error problem?
> 
> 
> Yeah, I think you are on the right track there - it is a timing 
> issue of some sort I think.  I don't think it has to do with the 
> leading edge detector though.  I don't recall this printer every 
> picking up a piece of paper and having it ready to print during 
> power up.  Rather, the only time paper is picked up is when it is 
> suppose to print something.
> 
> It has to be something silly with that other sensor on the feeder.  
> I will have to watch the gear train to see what it is doing and try 
> to "open/close" the switch in sequence to that gearing and see if 
> that helps.
>