68kMLA Classic Interface
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| SE/30 can’t find HD | |
| Posted by: fimbulvetr on 2019-02-11 19:41:04 I can’t figure this one out. I have a socketed SE/30 with a daystar powercache 40mhz accelerator in it that suddenly stopped finding the hard drive. There is nothing wrong with the drive as it works fine in my other (unsocketed) SE/30, and it won’t find my scsi2sd when I tried that. It boots fine off a floppy or a floppyemu. The motherboard was recapped a couple years age, and it has run fine until now. I tried tattletech, and that said no scsi devices are connected. Lido comes up with an error “Arbitration failed! Check connections and terminators on all SCSI devices.” I tried re-seating all the ram etc. No luck! Any idea what might be wrong? Thanks! | |
| Posted by: Johnnya101 on 2019-02-12 02:54:57 Dead Mac Scrolls says it's the scsi chip. Look up a PDF and check it out, page 177. | |
| Posted by: Johnnya101 on 2019-02-12 03:53:35 There might also be a blown fuse by the scsi port I think? | |
| Posted by: fimbulvetr on 2019-02-12 05:54:25 Replacing a 44 pin SMD chip like NCR53C80 is definitely well beyond my comfort level, soldering equipment, and skills. Replacing the fuses I could do. There are 2 there .. F2 and F3. One or both? What are the specs of the fuse? They look fine to me, I don’t know how fuses like that look when they blow. | |
| Posted by: Trash80toHP_Mini on 2019-02-12 07:27:25 Doesn't matter how they look, only if they still complete the circuit. Continuity tester time. They switched from DIP to Surface Mount for the SE/30 controller? | |
Posted by: fimbulvetr on 2019-02-12 07:39:11They switched from DIP to Surface Mount for the SE/30 controller?Yeah, you can see the SCSI controller in this pic of my board (back from the happier days when it was running) View attachment 12022 | |
| Posted by: Trash80toHP_Mini on 2019-02-12 11:16:45 Makes sense, now I'm curious about the SE. Shouldn't have been surprised, but I was all dopey from cold meds . . . well . . . more dopey than usual. :blink: Try stopping by one of the hole in the wall places where they fix phones. SMT rework is what they do, at least that's what someone did to fix my 5c. Maybe someone will do it inexpensively and without shipping it, probably while you wait even. | |
| Posted by: fimbulvetr on 2019-02-13 20:27:09 Well, the fuses are fine, I plugged in a Zip drive with active termination into the rear scsi port with no luck, then I got out a magnifying glass and took a look at the scsi controller. Looks like when the previous owner recapped the logic board they didn’t deal with the corrosion damage from cap goo under the scsi controller.   | |
| Posted by: just.in.time on 2019-02-13 20:45:39 That sucks that it wasn’t properly cleaned last time. I’m wondering if you can give it a good wash to actually clear any remaining electrolitic fluid and then just resolder each pin one at a time along that side facing the capacitors. Just 11 pins right? If you have a solder sucked it shouldn’t be too horrible. Maybe someone with more experience around that chip can comment. At any rate, if previous owner screwed up cleaning there you can probably assume the rest of the board had a crap cleaning job as well. So a thorough washing is probably in order regardless before other common areas are damaged. | |
| Posted by: fimbulvetr on 2019-02-20 06:40:42 I ordered a new NCR 53C80 SCSI controller. I'll see if I can find an electronics repair place in Ottawa that can handle replacing it for me. | |
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