apple IIe stuck

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apple IIe stuck

Hi guys, on power on my Apple IIe PAL filled the video with garbage, i replaced all the RAM IC and it started. I was able to interact. I wrote something and press return and i got "?SYNTAX ERROR".
After some power off and power on, i got  screen but i'm not able to interact, if a press CTRL+closed apple+reset the diagnostic start and I got KERNEL OK.
Any suggest to fix the problem?
thanks a lot

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what did you type that

what did you type that produced the SYNTAX ERROR?

 

Try typing HOME and then return. Does that work?

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I wrote some char and hit

I wrote some char and hit enter, but now i'm not able to write anything i think the encoder chip is faulty, is there a way to test it?

Now every time i power on, a "+" is printed repetitevely

 

thank you

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The keyboard may need to be

The keyboard may need to be thoroughly cleaned.  Also make sure the cables and socketed chips are firmly seated.

 

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Yes, I cleaned the keyboard

Yes, I cleaned the keyboard and checked the IC, the strange thingh is i'm able to launch the test with CTRL+close apple+reset, but if i press a key no chars are printed on video.

thanks

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zappx wrote:Yes, I cleaned

zappx wrote:

Yes, I cleaned the keyboard and checked the IC, the strange thingh is i'm able to launch the test with CTRL+close apple+reset, but if i press a key no chars are printed on video.

thanks

 

Well that suggests the encoder is broken.  The reset key is the only key that doesn’t go through the encoder and  it sounds like that’s the one key that works.

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I will buy a new encoder, i

I will buy a new encoder, i will let you know if everything will works fine.

thank you

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Hi, I changed the encoder

Hi, I replaced the encoder chip and now the apple IIe stopped to repeat number 9 or + on the screen, but the keyboard does not work. Any suggest?

N.B. the keys combinations for reset and test works fine

thanks in advance

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Just fyi reset and apple keys

Just fyi reset and apple keys do not pass through the keyboard scan circuitry.  It could be the keyboard, the 40 pin ay-5-3600pro (you may have gotten a bogus or faulty one) or the keyboard ROM. 

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And of course, always check

And of course, always check the power supply first! Make sure all the voltages are within spec, especially the -12V.

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Many thanks to all guys, I

Many thanks to all guys, I replaced again the AY-5-3600-PRO. The first one was a "clone" bought on ebay at low price, for the second one  I made sure that it was an original GI encoder chip and it worked. I fixed the problem, now the keyboard works fine.

regards

 

 

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