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Old 01 December 2017, 01:32   #1
PARALAX
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A1200 - Track 0 Signal not detected

I have an A1200 board here which is not booting or loading disks correctly, no matter if they are demos or games. If I test the drive with the Logica Diagnostic ROM it displays that the Track Zero Signal is not detected. The floppy drive and cable are working on all other boards but not here. It's a 1D4-Board with no Escom-Fix. The connection between Pin 26 and the capacitor above is present. And idea how to find the reason for this behaviour?
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Old 01 December 2017, 19:28   #2
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No idea someone?
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Old 01 December 2017, 19:35   #3
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CIA-A damaged?
Have you tried to switch with CIA-B?
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Old 01 December 2017, 19:51   #4
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Yes, both CIA's are okay. I've tested the mainboard with the Logica Diagnostic ROM before and everything works fine except the floppy. When I try to read a disk I get the error message above (No track zero signal detected).
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Old 02 December 2017, 08:49   #5
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Problem solved! There was a disconnected trace on the back side of the board. After fixing this it works as it should.
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