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 centris 610 jimmy rigged
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wisof
Junior Member


USA
257 Posts
Posted - 21 Aug 2003 :  16:20:22
I picked up a Centris 610 during some saturday morning sales not too long ago. The machine worked great, but had a 680LC40, and I like to put in 68040s. When I go to open it up, there is a something that looks like the end of a jumper cable attached to a part of the motherboard. this is very close to the processor, so I had to remove it to switch them out. Well, when I removed it is seemed like that jumper cable thing was sort of securing that piece onto the motherboard. Now I cannot set it back, and it looks like the piece is pretty much hanging by a thread. Now when I go to power the centris, it does not hold. If I keep holding down the power button, it turns on, but no boot. As soon as I let go of the power button, no power. I will post pictures so as to give a better idea of what the heck I am talking about. any ideas of how to get this thing back on or why it would have been there in the first place?

I have a bad feeling that this might be my first dead mac. I guess I could just get another motherboard. . .

_____________________________________________
I have a problem with vintage electronics. . .I am working on it.

Performa 630CD
Centris 610
Quadra 950
Quadra 605
Giant 80mb SCSI HD

maclover5
LC Doctor/Hot Rodder


Australia
5830 Posts
Posted - 22 Aug 2003 :  02:06:28
Ut oh...good luck!

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Warrior maclover5
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G4from128k
Full Member


USA
873 Posts
Posted - 25 Aug 2003 :  06:45:21
quote:
I have a bad feeling that this might be my first dead mac. I guess I could just get another motherboard. . .
Bummer! But maybe it is just a loose cable or intermittant connection inside the computer. What is the "jumper cable" thing? If it is one of the power cables, it should stay in its receptacle from friction. Post some piccies and I'm sure we can figure things out.

G4From128k

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Edited by - G4from128k on 25 Aug 2003 07:02:08Go to Top of Page

~tl
Junior Member


United Kingdom
312 Posts
Posted - 25 Aug 2003 :  11:12:19
yeah pics would be good ... is it actually part of the mobo hanging off or something connected into a socket hanging off ... looking at the c610 board scans on AF there dosnet seem to be any sockets near the proc ... the only thing near is the PRAM batt slot ???

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wisof
Junior Member


USA
257 Posts
Posted - 26 Aug 2003 :  07:51:36
fellas, I will surely post pics, unfortunately work has kept me busy for the last few days.
The piece that is hanging off is actually part of the motherboard, and it is pretty close to the PRAM battery slot between the processor and the drivebay. The "jumper cable" thingy is made by 3M, and it looks to be some kind of electrical part. there are some wires soldered onto it. My guess is that it was keeping the piece attatched to the mobo, and was a path for electricity to go through (I am not at all an electrician) and I went ahead and messed it up.

Have a radiohead concert tonight, so I will not have pics, but look in the next day or so and will post something. . .

_____________________________________________
I have a problem with vintage electronics. . .I am working on it.

Performa 630CD
Centris 610
Quadra 950
Quadra 605
Giant 80mb SCSI HDGo to Top of Page

~tl
Junior Member


United Kingdom
312 Posts
Posted - 26 Aug 2003 :  12:12:56
ouch yeah ... sonds like the board has been broken and someones tried to fix it ... but pics will confirm

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maclover5
LC Doctor/Hot Rodder


Australia
5830 Posts
Posted - 28 Aug 2003 :  06:10:03
Yeah, that definately doesn't sound normal. As i said before, good luck.

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Warrior maclover5
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jruschme
Junior Member


USA
196 Posts
Posted - 28 Aug 2003 :  09:20:07
quote:

Yeah, that definately doesn't sound normal. As i said before, good luck.


Silly question, but could this be some kind of overclocking thing? I'm thinking of something like OE sells since the description sounds a little like something out of the Clock Chipping page.

<<<john>>>Go to Top of Page

maclover5
LC Doctor/Hot Rodder


Australia
5830 Posts
Posted - 28 Aug 2003 :  16:26:11
Hmm yeah, i forgot that they made those for 68ks. Ah well, we'll just have to wait for the piccies.

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Warrior maclover5
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wisof
Junior Member


USA
257 Posts
Posted - 29 Aug 2003 :  15:33:53
sorry y'all. . .first week of classes at UofC Boulder. . .students been keepin me busy. . .pics comming this weekend PROMISE!!!!!!!!!

I did notice that 610 ran pretty nicely. . .hmmm

_____________________________________________
I have a problem with vintage electronics. . .I am working on it.

Performa 630CD
Performa637CD
Centris 610
Quadra 630
Quadra 950
Quadra 605
SE
Giant 80mb SCSI HD
Giant 100mb SCSI HDGo to Top of Page

wisof
Junior Member


USA
257 Posts
Posted - 29 Aug 2003 :  21:24:58
finally. . .pics of the dilema. . .
http://www.demilitarizedzone.net/610_thumbs.html

_____________________________________________
I have a problem with vintage electronics. . .I am working on it.

Performa 630CD
Performa637CD
Centris 610
Quadra 630
Quadra 950
Quadra 605
SE
Giant 80mb SCSI HD
Giant 100mb SCSI HDGo to Top of Page

G4from128k
Full Member


USA
873 Posts
Posted - 30 Aug 2003 :  05:57:54
Yep, jruschme nailed it. That little jumper cable thingie is/was a overclocking hack. The little silver box object on top is the new crystal (you should be able to puzzle out the clock speed). The dislodged black object is part of the clock circuitry of the Centris. As a first step, resoldering the black chip might restore the computer to good health unless the overclocking mod involved other changes to the mobo. A bit of Googling should help you find info on these "clock chip" modifications.

And if you want a fun challenge, see if you can rewire/reinstall the jumper cable thing back onto the reinstalled black chip to overclock the new processor.

Best wishes,

G4From128k

by Day: Mild-Mannered Engineer and Trapeze(tm) Artist
by Night: Colonel of Truth, Justice, and the Macintosh Way
Reserve Officer in 68kMLA Cantankerous Coot Contingent
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QuadraJets
Junior Member


USA
344 Posts
Posted - 30 Aug 2003 :  13:15:33
The black thing is the SMT oscillator, and it really does not have to be reinstalled if you want it overclocked

here's a little page I made with an explanation... but I am tired, so it might not make much sense

http://68k.dyndns.org/osc/osc.html

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