What is the battery area like?
Good catch!! It looks like pin 50 of the 68030 is broken or shorted to pin 49. From a glance at the datasheet, pin 49 is +5V and pin 50 is NC, so I'm not sure it would make a difference though.Can you check the circled pin on the CPU? It looks like it's bent and touching the pin next to it. Or possibly even broken.
Can you check the circled pin on the CPU? It looks like it's bent and touching the pin next to it. Or possibly even broken.
Thanks. Will look into this. My understanding was that the area around C10 controlled the soft power on/off. Does it also control the boot-up sequence ?The area around C10 and friends is a bit cruddy, not sure if enough to stop the machine working, but D5, Q3, UD13 and UE13, and the vias around them could all use some retouching with fresh flux. For the two HC132 I'd actually pull them to ensure you have no corrosion issues under the ICs.
Wow, great eyes. I was really hoping that WAS the problem, but upon closer look, the two pins were not touching. And after straightening them, the problem is still there. Below is the pic of the undersideBased on the picture on the first post, that area looks pretty prestine.
@pinto_guy I was looking at the picture again. Can you check the circled pin on the CPU? It looks like it's bent and touching the pin next to it. Or possibly even broken.
If that doesn't solve your issue, can you take a picture of the underside of the board and post that?
The sound chip creates the reset signal for the rest of the system. If you're getting a chime of death, that's probably fine. I think you're right that a system with no RAM will always get a chime of death, but I haven't tried it recently.Thanks. Will look into this. My understanding was that the area around C10 controlled the soft power on/off. Does it also control the boot-up sequence ?
Also, does anyone know whether the chime of death always happens when no RAM is present
Thanks. Will look into this. My understanding was that the area around C10 controlled the soft power on/off. Does it also control the boot-up sequence ?
Also, does anyone know whether the chime of death always happens when no RAM is present
Oh great, thanks. Chimes of death (COD) are different for different products. If you see here, the COD for the IIcx sounds like a regular chime, followed by the death chime. I would assume it's the same for the IIci. Is this what you hear ?I just tested on my IIci.
With no RAM present, I get the normal chime first followed immediately by the death chime, so I hear both chimes back to back.
Thanks. Yeah mostly lint and dust. Looks like the PCB varnish on the underside suffered from chicken pox though (see high res photo).The bottom side doesn't appear as clean as the top side was. Can you also check these traces for continuity? This might just be the lighting or lint sitting on top, but just confirming.
Oh great, thanks. Chimes of death (COD) are different for different products. If you see here, the COD for the IIcx sounds like a regular chime, followed by the death chime. I would assume it's the same for the IIci. Is this what you hear ?
Thanks. Yeah mostly lint and dust. Looks like the PCB varnish on the underside suffered from chicken pox though (see high res photo).
Ah, thanks. So yeah, what I hear is only the chime of death, which I also hear when there is no RAM. This seems to exonerate the RAM from being the cause of my problem. That's progress. Thanks again @jmaczNo, it was clearly a regular chime followed by the death chime which has that extra note in front like in the link you provided.
So one note good chime, brief pause, followed by 5 note death chime (1 of which sounds like another chime followed by the usual 4 note death chime).
I have attached an audio clip I just recorded.
Ah, thanks. So yeah, what I hear is only the chime of death, which I also hear when there is no RAM. This seems to exonerate the RAM from being the cause of my problem. That's progress. Thanks again @jmacz
We've discussed it a few times, there are sort of two sources, a very detailed description of the original macs (128->Plus era) and a slightly less detailed discussion of the early Mac IIs. The IIci won't be identical because it has a newer ROM, but so did the IIfx we were discussing (the IIfx and IIci ROMs are very similar other than differences resulting from hardware).There was a startup sequence posted somewhere on this forum which lists the sequence of checks done. That might help see what comes before the memory tests.