[KL] K2000RS blank LCD problem, even after hard reset

[[e-mail] [KurzList]]

Hello, all! I've been sitting on the sidelines of the group for a year or two, trying to help others, but now it looks as if I need some help myself!


Upon initial power-up of my K2000RS, not one of the 8 red LEDs lights up, but the floppy drive light does light up. However, the floppy light stays on. And that's it. Nothing appears on the LCD, but the LCD backlight is lit. Fan is operating. I thought I checked voltages last time I was in there, and they seemed fine.



I tried the "Diagnostic Mode Method" listed here:
http://kurzweil.com/knowledgebase/k2000/troubleshooting/193 http://kurzweil.com/knowledgebase/k2000/troubleshooting/193/ to reset it to factory defaults. Nada.


I removed the battery and waited 30 minutes before putting it back in. That did nothing, either.


I was looking thru my old K2000 folders and found this:
Blank LCD Problem: You turn on the machine, but the LCD is blank and you get no sound. Hard Reset solution fails.Draining the battery-backed PRAM fails. For me, the culprit was a bad IC (U23).


I looked at the schematic and U23 is a little 4-bit synchronous up/down counter chip on the audio board. To me, that seems like a pretty remote thing being wrong, so I'm hoping someone here has had some experience with this and has an idea of what it might be.


Thanks!


Steve

[Neil Hester [e-mail] [KurzList]]

Same problem with my 2500 keyboard, everything checks out as it should internally :(

Sent from Yahoo Mail on Android

On Sat, 17 Mar 2018 at 6:10, ***@yahoo.com [KurzList]<***@yahoogroups.com> wrote:  


Hello, all! I've been sitting on the sidelines of the group for a year or two, trying to help others, but now it looks as if I need some help myself!




Upon initialpower-up of my K2000RS, not one of the 8 red LEDs lights up, but the floppy drive light does lightup. However, the floppy light stays on. And that's it. Nothing appears on the LCD, but the LCD backlight is lit. Fan isoperating. I thought I checked voltages last time I was in there, andthey seemed fine.





I tried the "Diagnostic Mode Method" listed here:

http://kurzweil.com/knowledgebase/k2000/troubleshooting/193 to reset it to factory defaults. Nada.




I removed the battery and waited 30 minutes before putting it back in. That did nothing, either.




I was looking thru my old K2000folders and found this:

Blank LCD Problem: You turn on the machine, but the LCD is blank andyou get no sound. Hard Reset solution fails.Draining the battery-backedPRAM fails. For me, the culprit was a bad IC (U23).

 



I looked at the schematic andU23 is a little 4-bit synchronous up/down counter chip on the audioboard. To me, that seems like a pretty remote thing being wrong, so I'm hoping someone here has had some experience with this and has an idea of what it might be.




Thanks!




Steve



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[[e-mail] [KurzList]]

Post by ***@yahoo.com [KurzList]
Upon initial power-up of my K2000RS, not one of the 8 red LEDs lights up,
but the floppy drive light does light up.

When it's on, can you get into the front-panel diagnostics by pressing
4-5-6 together?
That should blink the 8 LEDs in order, and then flash them together.
Pressing Exit+Enter gets you out of the diagnostic mode and flashes the
LEDs again.

I think the buttons and LEDs are controlled by the scanner,
but isn't the LCD driven by the main processor?

[[e-mail] [KurzList]]

The K2000RS does not respond to panel button pushes of any kind. No effect from any switches including 1,2,3 or 4,5,6 or anything else. Zip. Nada. Nothing. Zilch.


And yes, the LCD is driven from the main processor board.


Steve

[Neil Hester [e-mail] [KurzList]]

Exactly the same case with My K2500, the buttons do nothing, no LED's light
up.

Neil Hester

Post by ***@yahoo.com [KurzList]
The K2000RS does not respond to panel button pushes of any kind. No effect
from any switches including 1,2,3 or 4,5,6 or anything else. Zip. Nada.
Nothing. Zilch.
And yes, the LCD is driven from the main processor board.
Steve

[Steve Daniels [e-mail] [KurzList]]

Hopefully, someone here has an idea of what it could be.

Steve

On Monday, March 19, 2018, 7:16 PM, Neil Hester ***@gmail.com [KurzList] <***@yahoogroups.com> wrote:

 

Exactly the same case with My K2500, the buttons do nothing, no LED's light up.

Neil Hester

On 19 March 2018 at 03:02, ***@yahoo.com [KurzList] <***@yahoogroups.com> wrote:

 


The K2000RS does not respond to panel button pushes of any kind. No effectfrom any switches including 1,2,3 or 4,5,6 or anything else. Zip. Nada. Nothing. Zilch. 




And yes, the LCD isdriven from the main processor board.




Steve




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[Neil Hester [e-mail] [KurzList]]

I've been though a lot of diagnosis checking logic states on the IC's,
voltages etc and everything checks out as it should, I'm totally stumped
with mine.

Neil Hester

Post by Steve Daniels ***@yahoo.com [KurzList]
Hopefully, someone here has an idea of what it could be.
Steve
Exactly the same case with My K2500, the buttons do nothing, no LED's light up.
Neil Hester
The K2000RS does not respond to panel button pushes of any kind. No effect
from any switches including 1,2,3 or 4,5,6 or anything else. Zip. Nada.
Nothing. Zilch.
And yes, the LCD is driven from the main processor board.
Steve

[Steve Daniels [e-mail] [KurzList]]

Same here! Lol!

Steve

On Monday, March 19, 2018, 9:39 PM, Neil Hester ***@gmail.com [KurzList] <***@yahoogroups.com> wrote:

 

I've been though a lot of diagnosis checking logic states on the IC's, voltages etc and everything checks out as it should, I'm totally stumped with mine.

Neil Hester

On 20 March 2018 at 01:36, Steve Daniels ***@yahoo.com [KurzList] <***@yahoogroups.com> wrote:

 
Hopefully, someone here has an idea of what it could be.

Steve


On Monday, March 19, 2018, 7:16 PM, Neil Hester ***@gmail.com [KurzList] <***@yahoogroups.com> wrote:

 

Exactly the same case with My K2500, the buttons do nothing, no LED's light up.

Neil Hester

On 19 March 2018 at 03:02, ***@yahoo.com [KurzList] <***@yahoogroups.com> wrote:

 


The K2000RS does not respond to panel button pushes of any kind. No effectfrom any switches including 1,2,3 or 4,5,6 or anything else. Zip. Nada. Nothing. Zilch. 




And yes, the LCD isdriven from the main processor board.




Steve











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[Tristan [e-mail] [KurzList]]

Have you tried taking out the backup batteries for a few hours and then powering on?

/Tristan

Post by Steve Daniels ***@yahoo.com [KurzList]
Same here! Lol!
Steve
 
I've been though a lot of diagnosis checking logic states on the IC's,
voltages etc and everything checks out as it should, I'm totally stumped with
mine.
Neil Hester
 
Hopefully, someone here has an idea of what it could be.
Steve
 
Exactly the same case with My K2500, the buttons do nothing, no LED's light up.
Neil Hester
 
The K2000RS does not respond to panel button pushes of any kind. No
effectfrom any switches including 1,2,3 or 4,5,6 or anything else. Zip. Nada.
Nothing. Zilch. 
And yes, the LCD isdriven from the main processor board.
Steve

[Steve Daniels [e-mail] [KurzList]]

Yes. I took them out, left them out for half an hour, and then put them back in. No change.

Steve

On Monday, March 19, 2018, 11:10 PM, Tristan ***@alphalink.com.au [KurzList] <***@yahoogroups.com> wrote:

 
Have you tried taking out the backup batteries for a few hours and then powering on?

/Tristan

Post by Steve Daniels ***@yahoo.com [KurzList]
Same here! Lol!
Steve
 
I've been though a lot of diagnosis checking logic states on the IC's,
voltages etc and everything checks out as it should, I'm totally stumped with
mine.
Neil Hester
 
Hopefully, someone here has an idea of what it could be.
Steve
 
Exactly the same case with My K2500, the buttons do nothing, no LED's light up.
Neil Hester
 
The K2000RS does not respond to panel button pushes of any kind. No
effectfrom any switches including 1,2,3 or 4,5,6 or anything else. Zip.. Nada.
Nothing. Zilch. 
And yes, the LCD isdriven from the main processor board.
Steve

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[Neil Hester [e-mail] [KurzList]]

Yes me too, had them out for several days, no change. 
Neil

Sent from Yahoo Mail on Android

On Tue, 20 Mar 2018 at 4:36, Steve Daniels ***@yahoo.com [KurzList]<***@yahoogroups.com> wrote:  
Yes. I took them out, left them out for half an hour, and then put them back in. No change.

Steve


On Monday, March 19, 2018, 11:10 PM, Tristan ***@alphalink.com.au [KurzList] <***@yahoogroups.com> wrote:

 
Have you tried taking out the backup batteries for a few hours and then powering on?

/Tristan

Post by Steve Daniels ***@yahoo.com [KurzList]
Same here! Lol!
Steve
 
I've been though a lot of diagnosis checking logic states on the IC's,
voltages etc and everything checks out as it should, I'm totally stumped with
mine.
Neil Hester
 
Hopefully, someone here has an idea of what it could be.
Steve
 
Exactly the same case with My K2500, the buttons do nothing, no LED's light up.
Neil Hester
 
The K2000RS does not respond to panel button pushes of any kind. No
effectfrom any switches including 1,2,3 or 4,5,6 or anything else. Zip... Nada.
Nothing. Zilch. 
And yes, the LCD isdriven from the main processor board.
Steve

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[[e-mail] [KurzList]]

I might start looking at the reset circuitry.
Maybe the reset line is stuck asserted and not letting the scanner and
main cpu come out of reset?

[Neil Hester [e-mail] [KurzList]]

Mine all chacked out ok when i tested them but I'll probably hve to go
throught them again if i want to dig back into it.

Neil Hester

Post by ***@frys.com [KurzList]
I might start looking at the reset circuitry.
Maybe the reset line is stuck asserted and not letting the scanner and
main cpu come out of reset?

[Steve Daniels [e-mail] [KurzList]]

That is the exact same thought I had over the last week. I don’t see the system releasing itself from the power-on reset. Could be that it is being held in the wrong state by something.

Most systems assert a power-on reset signal so that all the transients can settle out of the system during the power-up period and so that everything starts in a known and proper state. Then after some time, the power-on reset line is "unasserted" so that the system can function on its merry way.
I hope someone who's been through this can let us know if we're heading down the correct path!
Steve
On Thursday, March 22, 2018, 12:33:42 PM EDT, Neil Hester ***@gmail..com [KurzList] <***@yahoogroups.com> wrote:

 

Mine all chacked out ok when i tested them but I'll probably hve to go throught them again if i want to dig back into it.

Neil Hester

On 22 March 2018 at 16:08, ***@frys.com [KurzList] <***@yahoogroups..com> wrote:

 
I might start looking at the reset circuitry.
Maybe the reset line is stuck asserted and not letting the scanner and
main cpu come out of reset?




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[[e-mail] [KurzList]]

I've just swapped out the scanner board for another and now im getting all the red LED's flash 4 times on power up so thats some progress and i can start investigating moving forward.