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Old 03-03-2012, 09:39 AM   #1
dougal
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Default A500 keyboard fix ?

Some keys are not working

I pulled the keyboard apart and the membrane looks good, no darker patches or anything. I cleaned it up anyway. The keyboard controller board also looks fine.

What could be wrong ?
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Old 03-03-2012, 09:46 AM   #2
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Default Re: A500 keyboard fix ?

Its a row of keys not working.

9,O,L,>.
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A1200HD- Blizzard 1230IV / 64Mb / Kick 3.1 / OS 3.9 / 20GB HD / Indivision
A2000 Rev4.4 - '030 @25Mhz / 8MB / Kick 3.1 / ClassicWB
CD32 - Stock (W/ 2 CD32 Controllers]
A500 Plus - 68000 @ 7Mhz / 2MB Chipmem / 2Mb Fast ram / 2.04/Kick1.3 / A590
A600HD - 2MB Chip / 8MB Fast / 2GB CF HD / Kick 3.1
Various Spare A500's and A500 Plus's

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Old 03-03-2012, 09:46 AM   #3
Zac67
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Default Re: A500 keyboard fix ?

CAPS LOCK not flashing at power up? -> no power or dead controller
CAPS LOCK stuck after pressing a few times -> bad data connection to mainboard
some keys not working -> depending on layout, bad key contacts, bad matrix lines or bad controller

PS: 9, O, L - definitely a bad column line, check/measure the common line of those keys running to the controller IC, it's probably bad somewhere (or the solder point)

Last edited by Zac67; 03-03-2012 at 09:51 AM..
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Old 03-03-2012, 12:29 PM   #4
dougal
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Default Re: A500 keyboard fix ?

Quote:
Originally Posted by Zac67 View Post
CAPS LOCK not flashing at power up? -> no power or dead controller
CAPS LOCK stuck after pressing a few times -> bad data connection to mainboard
some keys not working -> depending on layout, bad key contacts, bad matrix lines or bad controller

PS: 9, O, L - definitely a bad column line, check/measure the common line of those keys running to the controller IC, it's probably bad somewhere (or the solder point)
Great! I;ll take a look tomorrow then

Thanks
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A1200HD- Blizzard 1230IV / 64Mb / Kick 3.1 / OS 3.9 / 20GB HD / Indivision
A2000 Rev4.4 - '030 @25Mhz / 8MB / Kick 3.1 / ClassicWB
CD32 - Stock (W/ 2 CD32 Controllers]
A500 Plus - 68000 @ 7Mhz / 2MB Chipmem / 2Mb Fast ram / 2.04/Kick1.3 / A590
A600HD - 2MB Chip / 8MB Fast / 2GB CF HD / Kick 3.1
Various Spare A500's and A500 Plus's

PowerMac G4 1Ghz (MorphOS / Leopard)

http://amigamap.com/user/172
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