Amiga 4000 Right mouse Button always pressed

esel · 13 June 2019, 00:27

Hi, i have a Problem with my a4000d
The Amiga was recapped a few years back and is working perfect expect one thing:

The right and middle mouse Button and the 2 and 3 Button is always pressed even if no mouse is connected.

The pot x Signal on Paula is ok ( if i press the right mouse Button the Voltage Drops from 5 v to 0 v)

So i changed Paula but it’s still Not working.

Any ideas? Is there something After Paula telling Amiga os that the Button is pressed ?

quantum8 · 13 June 2019, 00:57

Just to rule a couple things out:
Does it still happen when the mouse is disconnected?
Are you able to try another mouse?

esel · 13 June 2019, 01:24

Yes, it happends Even if nothing is connected.

grelbfarlk · 13 June 2019, 02:12

Maybe look in the area of U975 if it has suffered battery damage, but even that resistor R984 could cause it, maybe.

13 June 2019, 00:27	#1
esel Registered User Join Date: Jul 2012 Location: Kassel Posts: 158	Amiga 4000 Right mouse Button always pressed Hi, i have a Problem with my a4000d The Amiga was recapped a few years back and is working perfect expect one thing: The right and middle mouse Button and the 2 and 3 Button is always pressed even if no mouse is connected. The pot x Signal on Paula is ok ( if i press the right mouse Button the Voltage Drops from 5 v to 0 v) So i changed Paula but it’s still Not working. Any ideas? Is there something After Paula telling Amiga os that the Button is pressed ?

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13 June 2019, 00:57	#2
quantum8 Registered User Join Date: Jun 2019 Location: BNE AU Posts: 216	Just to rule a couple things out: Does it still happen when the mouse is disconnected? Are you able to try another mouse?

13 June 2019, 01:24	#3
esel Registered User Join Date: Jul 2012 Location: Kassel Posts: 158	Yes, it happends Even if nothing is connected.

13 June 2019, 02:12	#4
grelbfarlk Registered User Join Date: Dec 2015 Location: USA Posts: 2,653	Maybe look in the area of U975 if it has suffered battery damage, but even that resistor R984 could cause it, maybe.

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