Yesterday I tried booting my mac again. It had nothing to do with the battery/hard disk/PSU/capacitor problems-I was testing a boot floppy. I was using the double-flick to boot the mac.
I, as has already been mentioned, was trying to make a system 6 boot floppy (see post 15 June). I never managed to make that disk, but I did make a system 8 floppy which booted fine.
I did, however, notice something interisting with the hard disk. Once, it did stay spun up, but I was in the process of zapping the PRAM, so of course the mac rebooted and the hard drive didn't work. Why does the drive spin once and then not again? I didn't disconnect the power, switch the mac off, change a thing, but yet the second it wouldn't go. On the times, however, when it did eventually spin down (the "bad" startups), I heard a faint rapid "click click click click" noise from the disk, about twice a second. I don't think, however, that that's a sign of stuck heads, as it was running fine 5 seconds before.
spiceyokooko wrote:Umm... I don't know the correct voltages for each pin on the connecter.
Look up the make and model number on google and find out what the power requirements are.
The hard disk doesn't have a model number printed on it (I just took the cover off the disk, but none of the disk platters said anything on then ). Seriously now, it just says "Apple 3.5 internal HDD", or something like that. I did notice, however, that the power requirements on the disk stated 5 and 12 volts dc. Which wire is which voltage, however, and is there an easy way to find out?
onlyonemac wrote:Under no load:
-Blue wire: -4.8v
-Yellow wire: 11.11v
-Orange wire: 5.27v
Under load when powering mac:
-Blue wire: -5.06v
spiceyokooko wrote:Those figures look okay, but...
PSU states 5v, 12v and -5v on sticker. Those voltages look so far out to me that I think it'll damge my logic board with that over-voltage !