68kMLA Classic Interface
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| Quadra 840av questions | |
| Posted by: imactheknife on 2022-07-15 07:49:30 Have a nice quadra 840av. Removed old caps, no leaks i could see. Computer functioned normal. removed old caps, cleaned board with isopropyl 91% soak and light scrub. Rinsed and let dry with distilled water. Let dry. Recapped with tantalums. She turns on, gets the chime, hear scsi, but after 5 seconds i get what I think is a death chime. No video. Anywhere i should check / look. | |
| Posted by: imactheknife on 2022-07-17 15:05:20 ok, finally got video, and flashing folder icon. I dont seem to have a bootable floppy for this model. It isn't seeing my SCSI bus or hard drive. What chip would take care of this on a 840? This was a clean fully working unit before recap. its close, just need some help on this last bit | |
Posted by: Lycus on 2022-07-17 15:11:28 Based on the board layout I'd say this chip | |
| Posted by: Lycus on 2022-07-17 15:17:00 The chip appears to be a AM79C950 Wikipedia says this is used through the ANS and PM9500 as well, and it is a combined SCSI, serial, and network controller | |
| Posted by: imactheknife on 2022-07-17 15:39:21 ok will look into it the chip and see if it needs to be cleaned I Ended up picking up an se/30 upgraded se yesterday kind of unexpected. so will keep you posted on yours. I would love to have that. This se was local, so that was nice | |
| Posted by: Lycus on 2022-07-17 16:36:44 Looking on eBay, the AM79C950s are like $6.50 USD, if worst comes to worst. | |
| Posted by: imactheknife on 2022-07-17 16:59:00 Thanks! I got her to boot, then i tried to do something and i got an error that needed a restart. After that just got flashing folder again. | |
| Posted by: imactheknife on 2022-07-18 06:08:09 washed her up, found a nasty pinch in my SCSI cable going down past cdrom. Works like a charm now🙂 | |
| Posted by: joshc on 2022-07-18 06:21:26 Nice, glad you got it working. SCSI cables can be a pain. | |
| Posted by: imactheknife on 2022-07-18 06:28:20 I once bought a quicksilver g4 dual 800 from westworld computers in Edmonton years before "apple stores" so this was a reseller. They had this tower on for a low price because the techs could not figure out the issue with it. So I snagged it and brought it home. Sure enough, stupid thing had issues. Played around with it, noticed the IDE cable had a hole in it. Changed cable, and never had an issue again lol...was the best deal ever on a Mac tower at the time 🙂 | |
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