I see.  Thank you for the clarification.  Yes, it would be confusing if 
there were unused button pads or pads used differently. Perhaps you can 
trace out a pin to pin and reconstruct the circuit.  Just a thought.  I am 
sure you can design anything you need to.
Cheers


----- Original Message ----- 
From: "cdb" <colin@btech-online.co.uk>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, August 13, 2009 4:53 PM
Subject: Re: [EE]Powering an LCD backlight


>
>
> :: What is your goal?  From your circuit you are not showing the 620
> :: ohm to +V
>
> My goal is to suss out, then use these two graphics modules that I
> have aquired from my two defunct Xerox Phaser printers. These are
> obviously a commissioned production run from Tektronix/Xerox by
> Hyundai.
>
> My problem is tracing where everything goes, especially as many tracks
> and vias go under the glass itself.
>
> As the circuit shows, the 620 ohm resistor is switched via the uC (pin
> 44 to be precise). You are correct I could just make my own circuit,
> but the backlight, Vee generator and what looks like it might be a a
> watchdog arrangement + 6 button pads and two Led's are already on the
> board. Now in reality that is all I need to know, I can easily get a
> Pic to go high and switch the backlight on, but I'd like for reference
> purposes to have an accurate schematic.
>
> Colin
> --
> cdb, colin@btech-online.co.uk on 14/08/2009
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