Mikeee76 Posted December 16, 2018 Share Posted December 16, 2018 Hello everyone!it's my first post here (been lurking here for a while although),My name is Michael and I've bought recently two 600xl. (Owned one 600xl (later an 800xl) as a child).One of them works perfectly, the other one has some keyboard issues...Some keys won't work ( 5,8, T, I, G, K, B, M ,to be precise).According to this thread [http://atariage.com/forums/topic/105170-600800xl-keyboard-variants/]it's the "type 3" keyboard (by AWC, with springs and mechanical switches).I've already detached it from the mainboard and the connector/band seems to be OK.Since it has no mylar I also removed the cap from a "5" key (as an example) to see if the switch works and yes, it does.My question:What to do next?, do you have any ideas?Thanks. Quote Link to comment Share on other sites More sharing options...
manterola Posted December 16, 2018 Share Posted December 16, 2018 All those keys are part of the line 12. That is connected to IN2 So the most likely problem is a trace broken in the keyboard PCB. Or in the cable. Check the diagrams attached. Welcome to the forums 1 Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted December 16, 2018 Share Posted December 16, 2018 Hi, the ribbon cable on 600xl keyboards are notorious for being hit n miss. Give it a wiggle and see if the keys work intermittently, it may help detect the fault.. when i dealt with mine, i discovered several pins in the original flat ribbon socket (the motherboard one) had snapped inside the black plastic housing. so i soldered in a 1x24-pin header onto the motherboard and made a ribbon cable to suit. i think the original ribbon cable and the resistor board are a bit too bulky and mustve got stress fractured. the repair was a bit of a repetitive faff but it solved the problem with a long term durable repair. i also found it ran fine without the intermediate resistor board. 1 Quote Link to comment Share on other sites More sharing options...
JR> Posted December 16, 2018 Share Posted December 16, 2018 . i also found it ran fine without the intermediate resistor board. I have 3 600XLs and none of them have the resistor board. I wonder how common it really was? Quote Link to comment Share on other sites More sharing options...
Mikeee76 Posted December 17, 2018 Author Share Posted December 17, 2018 As Manterola mentioned, it was indeed a broken line (Line12) in the keyboard pcb. Someone tried to fix it in the past (the path was already soldered).The keyboard works now.Thank you very much! 4 Quote Link to comment Share on other sites More sharing options...
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