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Author Topic: A600 - joystick error  (Read 1155 times)

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Offline kris2222Topic starter

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A600 - joystick error
« on: September 25, 2012, 10:20:15 AM »
Hi!

A strange problem appeared - when I push joystick up, it randomly goes diagonally (for about a second, sooner or later) up/left, then back to up.

The problem persists on all joysticks, regardless if I have extra memory plugged in or not.

What might be the cause?

Thanks for help in advance!
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Offline carvedeye

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Re: A600 - joystick error
« Reply #1 on: September 25, 2012, 10:32:02 AM »
The CIA chips maybe?
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Offline kris2222Topic starter

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Re: A600 - joystick error
« Reply #2 on: September 25, 2012, 10:40:26 AM »
Thanks, is it possible to replace them?
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Offline kris2222Topic starter

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Re: A600 - joystick error
« Reply #3 on: September 26, 2012, 12:30:52 PM »
I noticed that 74LS157 has been replaced, looks like in a clumsy way. Does it have something to do with joystick/ mouse controls?

Here are the photos, click an then click again to view whole size.





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Offline arttu80

Re: A600 - joystick error
« Reply #4 on: September 26, 2012, 06:56:34 PM »
Oh boy. Yours LS-chip repair doesn't look very promising! Check with some basic multimeter that those traces aren't broken. Indeed this chip is important to your mouse/joy functions. Check picture below from Service Repair Manual...



Damn I got caught using widoze... :(

Afterall, is it even right chip installed there?
« Last Edit: September 26, 2012, 07:00:35 PM by arttu80 »
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Offline kris2222Topic starter

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Re: A600 - joystick error
« Reply #5 on: September 27, 2012, 04:47:13 PM »
Thanks a lot for the feedback.

I'm gonna buy a multimeter, check the patterns and maybe replace the chip for this one:

http://sklep.slawmir.com.pl/product_info.php?products_id=45229

What makes you think it is a wrong chip?
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Offline arttu80

Re: A600 - joystick error
« Reply #6 on: September 27, 2012, 07:23:47 PM »
Actually as I look at it more carefully, It seems id does read 74ls157, so it's the right chip. My mistake.
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