A1200 Keyboard Diagnosis

Elmo Putney · Yesterday, 20:33

My A1200 has in the past lost a few keys when I haven't used it for a while (like days), they eventually come back after a few hours. Just wondering if I can diagnose where the issue is (membrane, connector, controller etc...)
I've not used it for a Month or so, and currently it is refusing to co-operate, it really is a twat sometimes.

I have cleaned and re-seated the ribbon cable, and it looks good - so I don't think that is the issue.

I have an A500 in the cave - can I test that keyboard on an A1200 to start to isolate the issue? i.e. is it "plug compatible"?

Diagrom: no issues (other than the keys not registering)

It is normally the same keys that drop out, I looked at the schematics to see if it gave any clues as to maybe a specific trace is flaky but they are not very helpful.

Keys that are out:

F10
Del
Keypad: 0 (zero)
Enter (not the keypad one)
Backspace
and |\ (next to backspace)

Does that give any useful clues? (probably not)

Thanks all

Also have an A600 I could swap the keyboard from.

Elmo Putney · Yesterday, 20:43

Obviously having just written this the little twat has decided to re-enable the lost keys, it's been switched on for about 3 to 4 hours running diagrom and with me poking/cleaning etc......none of which made any difference, until leaving it alone to sulk for a bit.

Question still stands though.

And yes it's recapped.

Elmo Putney · Yesterday, 20:46

The one thing I think I can conclude is that it's not the membrane if all the missing keys came back at the same time? true?

Yesterday, 20:33	#1
Elmo Putney Registered User Join Date: May 2022 Location: UK South East Posts: 89	A1200 Keyboard Diagnosis My A1200 has in the past lost a few keys when I haven't used it for a while (like days), they eventually come back after a few hours. Just wondering if I can diagnose where the issue is (membrane, connector, controller etc...) I've not used it for a Month or so, and currently it is refusing to co-operate, it really is a twat sometimes. I have cleaned and re-seated the ribbon cable, and it looks good - so I don't think that is the issue. I have an A500 in the cave - can I test that keyboard on an A1200 to start to isolate the issue? i.e. is it "plug compatible"? Diagrom: no issues (other than the keys not registering) It is normally the same keys that drop out, I looked at the schematics to see if it gave any clues as to maybe a specific trace is flaky but they are not very helpful. Keys that are out: F10 Del Keypad: 0 (zero) Enter (not the keypad one) Backspace and \|\ (next to backspace) Does that give any useful clues? (probably not) Thanks all Also have an A600 I could swap the keyboard from.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Need A1200 Keyboard connector to keyboard matrix pinout	Stardust	support.Hardware	1	27 June 2022 05:07
WANTED: Mitsumi/Amiga Keyboard for parts to mod A1200 keyboard!	ProdigalAmigan	MarketPlace	13	09 July 2017 02:08
A1200 Keyboard	Specksynder	support.Hardware	5	26 February 2011 08:20
A1200 keyboard	whitebird	support.Hardware	0	28 September 2010 21:23
A1200 diagnosis - no keyboard or mouse response	gizmomelb	support.Hardware	2	21 August 2006 09:33

Yesterday, 20:43	#2
Elmo Putney Registered User Join Date: May 2022 Location: UK South East Posts: 89	Obviously having just written this the little twat has decided to re-enable the lost keys, it's been switched on for about 3 to 4 hours running diagrom and with me poking/cleaning etc......none of which made any difference, until leaving it alone to sulk for a bit. Question still stands though. And yes it's recapped.

Yesterday, 20:46	#3
Elmo Putney Registered User Join Date: May 2022 Location: UK South East Posts: 89	The one thing I think I can conclude is that it's not the membrane if all the missing keys came back at the same time? true?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)