Recent content by RodCastler

Similar issue, and yes: same board: 630-0560-240V.

Not sure which type of connector you're referring to but I can tell you that mine looks like this:  http://www.nightfallcrew.com/wp-content/gallery/swapping-crt-tube-apple-macintosh-classic-se30/20150724_083127.jpg

That helped, thank you. Although the images I could find were non-bootable ones. The only bootable image I could find for System 7 was in http://www.emaculation.com/doku.php/basilisk_ii Thank you!!

Hi, the hard drive on my powerbook just died. I was hoping to boot it from floppy but I can't seem to find a System 7 image to boot it with. Any ideas where I can download it from?  I have a system 6 image but of course the 145 spits it out complaining about the release not being compatible to...

Another Mac has been liberated! Symptom was: Low voltages at the 5v and 12v rail. When under load, the rails went all the way down to 4v and 9.9v respectively. Cure: Re-capped every electrolytic, replaced TDA4605, CP23, IFBC40 and CY17G (4N36 used as replacement). Thank you so much for your...

Thank you for such a comprehensive reply, apm. Yes, I had check the voltage and it is close to 300V and everything seems correctly set-up for a 220v machine. Actually the previous state of this mac was that it could remain powered for ever but would show garbage on screen and the HDD would not...

I am re-testing some components. CP23 reads 560pF on the multimeter. It's a 271J, should read 270pF.  This is a new suspect. I removed it and the oscilloscope shows a strange behavior when under a square wave, like it's open circuit. It's clearly NOT shorted. Assuming it's defective (maybe open...

Hi all, Thanks to the valuable material found on these forums I have been able to *almost* liberate my mac classic. Looking for the source of the voltage drop at both 12V and 5V rails, I began with the routinary full re-cap of the leaky ones. Finally, after replacing the mosfet, the mosfet...

Thanks!  Actually the optocoupler is the very first thing I replaced after the re-cap. I used a 4n36 since I'll have to wait a few months before the exact part makes it to where I live: no local stores carry such part. I wonder if a 4n36 is at least a good replacement for testing purposes...

:( I'm running out of suspects. All of the resistors and remaining caps measure OK, as well as the diodes, the voltage regulator and several other main components. ... and I still have the voltage-out of spec issue, that drops under load. This is measured without the motherboard installed...

Hi there, Please allow me to join you since I'm on a similar situation with a mac classic and I'm currently troubleshooting the analog board as well. Symptom: 5 volt line reads 5.00v but drops to 4.1v under 1A load. 12 volt line reads 11.54v and drops to 9.47 under 1A load. (I'm using an...