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Restoring a Quadra 700 (warning: photo heavy)
Posted by: AlpineRaven on 2022-01-15 03:40:50 Thanks both for the kind words. I've just done the oscillator swap, replaced 50Mhz oscillator with a socket and 66.66 Mhz oscillator: View attachment 32580 View attachment 32581 View attachment 32582 By doing oscillator swap - have you run any other issues? Cheers AP
Posted by: MacKilRoy on 2022-01-15 06:11:50 By doing oscillator swap - have you run any other issues? Cheers AP A Quadra 700 which has been clocked differently than it’s stock clock speed will fail to run Apple A/UX operating system. Generally that would be the only drawback. I believe overclocking it changes the returned Gestalt value, resulting in some oddities like described above. There may be other issues relating to booting or installing certain Mac OS versions as a result.
Posted by: jessenator on 2022-01-15 07:42:50 By doing oscillator swap - have you run any other issues? Thankfully the biggest issue with everyday operations on a Q700 is just overclocking too much. 33 was my limit before losing features, system stability, but your mileage may vary. I can't speak to A/UX in depth. I managed to get version 3 completely installed on mine, however I was unable to keep it running after several bootings due to a degenerative spinning HDD malady. I'll be happy to proven wrong with other examples, as I'm simply one witness. The Gestalt ID problem is more a concern for 040 Macs where a) board resistors' effects on gestalt and frequency/driver value are interconnected (475/605) and b) where board resistors change the gestalt only, but that in turn changes memory timings from ROM and prevents POSTing or booting at higher frequencies (650/800) I haven't looked into the 63x/64x Macs, but they appear to follow a derivative process that of the 475/605. MacKilroy is correct though, that these unused gestalt IDs fail in operations where the system enabler doesn't have those IDs. The gestalt does not change on a 700, as far as I've used it.
Posted by: djhaloeight on 2022-02-07 05:40:14 Machine looks great! I always loved the looks of the Q700.
Posted by: joshc on 2023-07-14 13:06:56 This machine is on its way to a new owner in Germany who I'm sure will get lots of enjoyment out of it. 🙂 My Quadra journey continues with a different machine which I'll be posting about shortly.
Posted by: bamdad on 2024-12-27 12:56:09 does anyone have a link for the 66MHz oscillator (and preferably the socket) on mouser or some site in EU?
Posted by: bamdad on 2024-12-30 04:14:28 does anyone have a link for the 66MHz oscillator (and preferably the socket) on mouser or some site in EU? to respond to my own question i found this (the 66.666 one). if anyone could confirm this is what i'm looking for i'd be really grateful, otherwise i'll just order it and give it a shot.
Posted by: CuriosTiger on 2025-01-24 17:55:53 I recently scored a Quadra 700, a few weeks ago I had some time to give it some love. Here's what I did... This Q700 really wasn't in bad condition to start with, and already worked, so my main focus was to clean everything up and improve anything I could as I went along. To start with, I fully disassembled it - the case and logic board had some dust bunnies, nothing awful but it needed a clean. View attachment 32233 View attachment 32234 The internal case came out well after a quick brush to remove the dust: View attachment 32235 The front switches and clear plastic LED piece for the front power LED were removed and dumped in hot soapy water: View attachment 32236 The black side strips that run along the length of the machine were cleaned, they were rather dirty! View attachment 32237 The rear I/O panels and NuBus slot openings were cleaned out View attachment 32238 View attachment 32239 Some photos of the case before cleaning: View attachment 32240 View attachment 32241 The top lid before cleaning: View attachment 32242 Washing up liquid and a scrub is all I'm going to do on this. View attachment 32243 Came out really well... View attachment 32244 Same treatment for the front View attachment 32245 Front vents were cleaned/rinsed out: View attachment 32246 All the other little bits were cleaned and dryed View attachment 32247 The logicboard was brushed down and lightly swabbed with IPA: View attachment 32248 View attachment 32249 Starting to put things back together, looking quite sparkly and new really: View attachment 32250 The floppy drive was definitely the dirtiest part of the whole machine... View attachment 32251 I already knew it read disks OK, so I thought it worthwhile giving it a full clean - but I also knew it wouldn't eject disks, so there's something going on there. The drive carrier was a bit dusty, not too bad. View attachment 32252 That was rinsed and dried off, looks great now View attachment 32253 So.... onto the floppy drive. Before: View attachment 32254 After some initial brushing to remove the worst dust: View attachment 32255 Removing more bits revealed more dust... View attachment 32256 Going further, lets clean it up... View attachment 32257 Yep, broken eject gear. Same old same old. I don't have a spare replacement right now - so will have to return to this another time. View attachment 32258 New grease applied - I was probably a bit liberal with it but I can always remove access afterwards View attachment 32259 Everything back together. Can't fully test just yet because of that missing eject gear but what an improvement! View attachment 32260 Back to finish off the rest of it... SCSI2SD installed, and the original activity LED hooked up to it: View attachment 32261 Looking rather smart, albeit more yellow than my 6200, but still nice and clean now and ready for BUSINESS: View attachment 32262 And most importantly, the original HD activity LED works great... View attachment 32263 A few days ago, I did a few more things: Replaced the dirty and noisy original PSU fan with a new one. Stock fan: View attachment 32264 Replaced with a Noctua NF-A8 PWM: View attachment 32265 I also ordered some new RAM, to bring the total from 20MB to 68MB (including 4MB onboard): View attachment 32266 Things remaining to do: - Clean out power supply and recap it - Remove the original oscillator and replace with a DIP socket/new 66Mhz oscillator to crank clock speed from 25Mhz to 33Mhz - Get a new eject gear for the floppy drive Nice cleanup. I did a similar one on my Quadra 700, although I haven't tackled the floppy drive yet, and I probably ought to recap the PSU.
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