Hello, I'm hoping someone can help me with a Classic AB voltage issue I'm having.
I got a dead (not even the fan spun up) machine cheap figuring a recap and a cleaning would bring it back to life as it has on other machines I've worked on. I replaced the capacitors on both the AB and LB, as they looked to be "original equipment" from the factory. The battery died, but did not explode (thanks to some miracle).
Now I have the fan spinning up, and the AB is ticking softly so definitely forward movement. The problem now seems to be that the 12v power rail swings between 8v and 12v continually. Reading on the forum I thought replacing the CNY17G might settle things down; nope! Next up were the diodes people mention DP3, DP4 as I had a bunch on the shelf; nope, same problem.
Anyone have any ideas where to go next? I've restored several old Macs but this one seems to be possessed by some kind of evil spirit.
Thanks.
C
I got a dead (not even the fan spun up) machine cheap figuring a recap and a cleaning would bring it back to life as it has on other machines I've worked on. I replaced the capacitors on both the AB and LB, as they looked to be "original equipment" from the factory. The battery died, but did not explode (thanks to some miracle).
Now I have the fan spinning up, and the AB is ticking softly so definitely forward movement. The problem now seems to be that the 12v power rail swings between 8v and 12v continually. Reading on the forum I thought replacing the CNY17G might settle things down; nope! Next up were the diodes people mention DP3, DP4 as I had a bunch on the shelf; nope, same problem.
Anyone have any ideas where to go next? I've restored several old Macs but this one seems to be possessed by some kind of evil spirit.
Thanks.
C