I've just picked up an A500 1.3 and the original owner stated it was in working order. Aside from the fact I only paid £11 for it the modulator only outputs in black and white (tested modulator with a working A600). I have tried tuning the A520 using all 3 turny things inside it but no luck.
Does anybody know what the fault is?
If it's not fixable I'm willing to swap for parts I have (A500 mice, PSUs, floppy disk drives, blank disks, Commodore 1084 monitor lead - these things are rare

) for a working PAL A520.