CPC 664 repair ***SOLVED***

[dragon]

664 membrane are crapp, if you can't fix it. You can buy one new here:


https://www.ebay.es/itm/BRAND-NEW-Amstrad-CPC664-Keyboard-Membranes/133037095862?hash=item1ef9a0fbb6:g:c5cAAOxyg7xSZACq

My 664 don't have sound when arrive, the speaker was dead.

[repetto74]

664 membrane are crapp, if you can't fix it. You can buy one new here:


https://www.ebay.es/itm/BRAND-NEW-Amstrad-CPC664-Keyboard-Membranes/133037095862?hash=item1ef9a0fbb6:g:c5cAAOxyg7xSZACq

My 664 don't have sound when arrive, the speaker was dead.

Thanks Dragon :-). I am in the middle of the whole keyboard cleaning. The membrane was full of crap dust and hope a good cleaning will fix it.
By the way can I replace the 664 ROM with the one of the 6128?

[dragon]

You can try, i don't think it explode, or you can put parados.

[robcfg]

Aren't they the same?


As far as I know both had the 1.1 rom.

[dragon]

Despite the fact that the Locomotive BASIC keeps displaying 1.1 on startup, several revisions exist if we refer to the ROM header:
CPC664 (v1.10)

   
• CPC6128 (v1.20)

   
• CPC6128 (v1.21)

   
• CPC6128 (v1.23)

   
• Amstrad Plus (v1.40)

   
• AFAIK the differences, if any, between the v1.10 and later versions are undocumented. You can check the version installed on your own CPC with [color=rgb(53, 173, 27) !important]a small BASIC listing[/color]. (And if you discover a version not listed here, eg. v1.22, spread the infos and the ROM dump! Thanx!)"  https://web.archive.org/web/20160623222202/http://www.grimware.org/doku.php/documentations/software/locomotive.basic/start

[pelrun]

In a last desperate attempt I tried to put some fresh solder around the crystal circuit area on all transistors, caps and resistors. Believe it or not it is alive again!!! 

"Rework all the solder joints in case there are invisible dry joints" seems to be better and better advice every time I see something like this. I'm seriously tempted to give my 6128 a quick once-over

[repetto74]

Despite the fact that the Locomotive BASIC keeps displaying 1.1 on startup, several revisions exist if we refer to the ROM header:
CPC664 (v1.10)

   
• CPC6128 (v1.20)

   
• CPC6128 (v1.21)

   
• CPC6128 (v1.23)

   
• Amstrad Plus (v1.40)

   
• AFAIK the differences, if any, between the v1.10 and later versions are undocumented. You can check the version installed on your own CPC with [color=rgb(53, 173, 27) !important]a small BASIC listing[/color]. (And if you discover a version not listed here, eg. v1.22, spread the infos and the ROM dump! Thanx!)"  https://web.archive.org/web/20160623222202/http://www.grimware.org/doku.php/documentations/software/locomotive.basic/start

Tanks Dragon I'll try and let you know and yes the version on the 664 is 1.1

[repetto74]

Tanks Dragon I'll try and let you know and yes the version on the 664 is 1.1

Here is the result :-)
V 1.10



https://ibb.co/2h87BTc
https://ibb.co/QfTWK4P


This CPC664 needs either a conductive coating on the membrane contacts or a new membrane to fix the non working keys.

[dragon]

Yep, thats the problem my 664 membrane was killed to. If the 664 is rare a 664 with original membrane working is ultrarare.

[repetto74]

I may try to put some graphite on contacts before and see if that solves.