Restoring a Quadra 700 (warning: photo heavy)

MacKilRoy

Well-known member
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.
 

jessenator

Well-known member
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.
 

joshc

Well-known member
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.
 

bamdad

Well-known member
does anyone have a link for the 66MHz oscillator (and preferably the socket) on mouser or some site in EU?
 

bamdad

Well-known member
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.
 

CuriosTiger

Member
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.

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The internal case came out well after a quick brush to remove the dust:

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The front switches and clear plastic LED piece for the front power LED were removed and dumped in hot soapy water:

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The black side strips that run along the length of the machine were cleaned, they were rather dirty!

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The rear I/O panels and NuBus slot openings were cleaned out

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Some photos of the case before cleaning:

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The top lid before cleaning:

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Washing up liquid and a scrub is all I'm going to do on this.

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Came out really well...

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Same treatment for the front

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Front vents were cleaned/rinsed out:

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All the other little bits were cleaned and dryed

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The logicboard was brushed down and lightly swabbed with IPA:

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Starting to put things back together, looking quite sparkly and new really:

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The floppy drive was definitely the dirtiest part of the whole machine...

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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.

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That was rinsed and dried off, looks great now

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So.... onto the floppy drive.

Before:

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After some initial brushing to remove the worst dust:


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Removing more bits revealed more dust...

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Going further, lets clean it up...

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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.

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New grease applied - I was probably a bit liberal with it but I can always remove access afterwards

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Everything back together. Can't fully test just yet because of that missing eject gear but what an improvement!


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Back to finish off the rest of it...



SCSI2SD installed, and the original activity LED hooked up to it:


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Looking rather smart, albeit more yellow than my 6200, but still nice and clean now and ready for BUSINESS:


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And most importantly, the original HD activity LED works great...

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A few days ago, I did a few more things:

Replaced the dirty and noisy original PSU fan with a new one.

Stock fan:

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Replaced with a Noctua NF-A8 PWM:

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I also ordered some new RAM, to bring the total from 20MB to 68MB (including 4MB onboard):

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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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