Analogue-sequencer

Hello list, I have been away from my gear for the past two months.  
I had just tried my P3 last night (Kit, V1.5 boardset)and after a 
second of no lights, they began their blinky sequence but the Pled 
never came on.  I could still play and tweak my sequences (we dont 
need no stinikin display!) but my display never came on. 

 Could this be caused by a wall wart not putting out enough juice?
 Its a 9v 600ma from Mouser about two yrs old..  
 On a related note, this kit built unit has always had a problem 
where if I play with it for an hour, turn it off and then back on 
again, it wont boot up, I just get a few random leds, nothing more.  
Its never really bothered me but I want to get it 100% sorted before 
I upgrade the OS. (3.107?)

 so NO display?
 and
 no boot after beign fun for an hour or so..?

any help or tips would be greatly appreciated, my MIDI-CV will be 
here within a week!!

thanks
~Steve

>  so NO display?
>  and
>  no boot after beign fun for an hour or so..?

P3 wont boot if it doesn't get the expected response from the PLED display,
so a failing display module could explain both of those problems.
If you get a new module to try, see if the non-booting is fixed.
Come to think of it, I could probably add a little code to detect a failed
PLED, and give some indication on the LEDs to show this is the fault.

Best regards,
Colin Fraser
Sequentix Music Systems Ltd
http://www.sequentix.com

Colin, the sequencer works, its just that the display never comes 
on.  LED's work and it spits out MIDI, but no cool green !

~Steve


--- In analogue-sequencer@yahoogroups.com, "Colin Fraser" 
<colin@...> wrote:
>
>  
> >  so NO display?
> >  and
> >  no boot after beign fun for an hour or so..?
> 
> P3 wont boot if it doesn't get the expected response from the PLED 
display,
> so a failing display module could explain both of those problems.
> If you get a new module to try, see if the non-booting is fixed.
> Come to think of it, I could probably add a little code to detect 
a failed
> PLED, and give some indication on the LEDs to show this is the 
fault.

> 
> Best regards,
> Colin Fraser
> Sequentix Music Systems Ltd
> http://www.sequentix.com
>

Nope, no logic probe..  Ive got my meter.. and an old scope.  
Any other way to check?
Could I rig up a logic probe w/ parts??

~Steve




--- In analogue-sequencer@yahoogroups.com, "Colin Fraser" 
<colin@...> wrote:
>
>  
> >  Colin, the sequencer works, its just that the display never 
comes 
> > on.  LED's work and it spits out MIDI, but no cool green !
> 
> For the sequencer to work without the display coming on, the CPU 
interface
> on the PLED module must be working, but there is a problem on the 
module
> driving the display.
> The intermittent non-booting CPU may also be caused by the PLED 
module - if
> it doesn't repsond to the CPU interface.
> Both could be symptoms of a failed PLED module.
> Another possibility is that if the 74245 bus driver that handles 
the PLED
> interface is gone, it might have failed in a way that breaks the 
link to the

> PLED display, but makes the CPU think it's OK.
> You got a logic probe ?
> 
> Best regards,
> Colin Fraser
> Sequentix Music Systems Ltd
> http://www.sequentix.com
>

>  Colin, the sequencer works, its just that the display never comes 
> on.  LED's work and it spits out MIDI, but no cool green !

For the sequencer to work without the display coming on, the CPU interface
on the PLED module must be working, but there is a problem on the module
driving the display.
The intermittent non-booting CPU may also be caused by the PLED module - if
it doesn't repsond to the CPU interface.
Both could be symptoms of a failed PLED module.
Another possibility is that if the 74245 bus driver that handles the PLED
interface is gone, it might have failed in a way that breaks the link to the
PLED display, but makes the CPU think it's OK.
You got a logic probe ?

Best regards,
Colin Fraser
Sequentix Music Systems Ltd
http://www.sequentix.com

Hi all
Hi Steve
I had the same problem after 2 month I don't use the p3, power on
display stay off but p3 works!,I built my p3 kit so I've control and
all the data arrive to display pin!! so seems the display is burn?or
the ours display was defectives?
Now I'm thinking to buy a new display. 

Tony

>
> Hello list, I have been away from my gear for the past two months.  
> I had just tried my P3 last night (Kit, V1.5 boardset)and after a 
> second of no lights, they began their blinky sequence but the Pled 
> never came on.  I could still play and tweak my sequences (we dont 
> need no stinikin display!) but my display never came on. 
> 
>  Could this be caused by a wall wart not putting out enough juice?
>  Its a 9v 600ma from Mouser about two yrs old..  
>  On a related note, this kit built unit has always had a problem 
> where if I play with it for an hour, turn it off and then back on 
> again, it wont boot up, I just get a few random leds, nothing more.  
> Its never really bothered me but I want to get it 100% sorted before 
> I upgrade the OS. (3.107?)
> 
>  so NO display?
>  and
>  no boot after beign fun for an hour or so..?
> 
> any help or tips would be greatly appreciated, my MIDI-CV will be 
> here within a week!!
> 
> thanks
> ~Steve
>