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| Mac II w/ DayStar 50 MHz 030 accelerator doesn't chime |
Posted by: thisisamigaspeaking on 2025-02-13 04:00:58
I'm having trouble finding much information on Mac II repair on youtube. This machine isn't chiming right now. I've replaced the two 1/2 AA batteries. There was no leakage of the batteries or obvious leaky caps. The machine is extremely clean inside. There was a RasterOps 224 video card, an Apple video card with 13w3 connector which I believe is a Portrait card, and a 10 Mbit ethernet card. It doesn't chime with all the cards removed either.
Is my next step to get a 16 MHz 020 and see if it's the DayStar board? I do have a working Centris 650 with SuperMac Thunder/24 graphics if that will help me isolate any problems by swapping hardware. Thanks. |
Posted by: thisisamigaspeaking on 2025-02-13 22:52:30
Over on the VCF forums the advice I've gotten after providing a photo is that the caps have definitely leaked. |
Posted by: finkmac on 2025-02-14 05:52:45
SMD caps on 68k machines should always be replaced before any other diagnosis is done. |
Posted by: joshc on 2025-02-14 06:08:43
Yes, any Mac of this age that hasn't been recapped yet needs it, even if the caps 'look' fine. Start with that.
However on the Mac II, the startup circuit is often damaged by capacitor leakage, and without that being diagnosed, you may not find what is causing the non-start.
See here https://www.downtowndougbrown.com/2015/03/explanation-of-the-macintosh-iiiix-power-onoff-circuit/ |
Posted by: thisisamigaspeaking on 2025-02-14 17:36:28
Roger on the recap. |
Posted by: Renegade on 2025-04-15 02:28:00
@thisisamigaspeaking , do you mind posting pictures of your DayStar board ? |
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