[sdiy] Faulty FZ10M help

[MTG]

This is a farily commone failure mode in various equipment.... waiting for 
the LCD busy flag to de-assert and the LCD is defective, missing or there is 
a bad connection.  You can on a (working) unit if you are vulnerable to this 
if, after disconnecting the LCD, the unit fails to otherwise operate.

GB
www.musictechnologiesgroup.com


----- Original Message ----- 
From: "Rainer Buchty" <rainer at buchty.net>
To: "Gordon JC Pearce" <gordonjcp at gjcp.net>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, July 15, 2011 10:57 AM
Subject: Re: [sdiy] Faulty FZ10M help


> On Thu, 14 Jul 2011, Gordon JC Pearce wrote:
>
>> The display backlight is very dim, but it does light just a little bit.
>
> So you at least have won a replacement of the EL backlight foil. This 
> requires "crack-opening" the LCD carrier during which procedure the aged 
> plastic ribbon cable will most likely take its chance of shedding off some 
> contact glue or even the conductive print.
>
>> There's nothing displayed on it.  Nothing much happens if you push 
>> buttons, but if you wait for (I've timed it) 102 seconds the "MODIFY" 
>> light comes on.  After that, not much else happens.
>
> Weird.
>
>> Reading through the FZ-1 ROM disassembly it looks like it should grumble 
>> about failed RAM very early on.  There seem to be a lot of delays waiting 
>> for the LCD to go ready - is it possible that the LCD is just plain 
>> borked and everything else is waiting for it?
>
> Might be. I still have no real clue how that LCD unit really works and 
> what the role of that LCD-interfacing "GAL" component is.
>
> But... I would join in for an OS hack and replacement LCD unit where the 
> print, line, box, etc. routines are replaced by something driving a less 
> obscure LCD unit. (My FZ-1 is also collecting dust for far too long.)
>
> Some time ago I did a write-up on some wild guesses regarding the LCD 
> unit:
>  http://www.buchty.net/casio/display.html
>
> Rainer
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