A500 issue - floppy drive dims monitor

obitus1990 · 12 April 2018, 16:05

Hi, I have a very nice condition PAL A500, with Rev6a, all stock, with original chips and no mods done to it. The only expansion it has is a 512K trapdoor RAM expansion. It works fine, but has an issue in that every time the floppy drive clicks, or other wise reads, the monitor dims. It dims rhythmically with the click of the drive when there is no disk inserted. I have tried several PSUs, including ones of new construction, but, the 500 does the same with all of them. My other A500s also do not have this issue with the same power supplies, so, I think we can rule out there being an issue with the PSUs themselves. Where should I begin to look to try to fix the issue?

Many thanks,

Kirk

Amiga1992 · 12 April 2018, 16:15

I had this issue on an A600 when capacitors were failing. Maybe some cap in there is causing havoc.

12 April 2018, 16:05	#1
obitus1990 Registered User Join Date: May 2016 Location: Mandeville USA Posts: 203	A500 issue - floppy drive dims monitor Hi, I have a very nice condition PAL A500, with Rev6a, all stock, with original chips and no mods done to it. The only expansion it has is a 512K trapdoor RAM expansion. It works fine, but has an issue in that every time the floppy drive clicks, or other wise reads, the monitor dims. It dims rhythmically with the click of the drive when there is no disk inserted. I have tried several PSUs, including ones of new construction, but, the 500 does the same with all of them. My other A500s also do not have this issue with the same power supplies, so, I think we can rule out there being an issue with the PSUs themselves. Where should I begin to look to try to fix the issue? Many thanks, Kirk

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12 April 2018, 16:15	#2
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,645	I had this issue on an A600 when capacitors were failing. Maybe some cap in there is causing havoc.

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