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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Feb 24, 2012 11:01 pm Post subject: |
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Mac, I have a 0.5 amp pico fuse
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Feb 24, 2012 11:03 pm Post subject: |
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Whats the next larger you have?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Feb 24, 2012 11:08 pm Post subject: |
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Next larger one I have is a 2 amp Pico fuse
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macgyver655
Joined: 22 Aug 2007
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| Posted: Fri Feb 24, 2012 11:12 pm Post subject: |
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Well the .5 may blow even without a problem and the 2 is a big jump and can cause more damage if there is a problem.
So if you want to try the .5 just to see if it holds so we can continue but if it blows we still wont know if there is a problem or not.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Feb 24, 2012 11:14 pm Post subject: |
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| macgyver655 wrote: | Well the .5 may blow even without a problem and the 2 is a big jump and can cause more damage if there is a problem.
So if you want to try the .5 just to see if it holds so we can continue but if it blows we still wont know if there is a problem or not. |
Ill put it in and see what happens, ill let you know
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Feb 24, 2012 11:18 pm Post subject: |
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The fuse is holding mac, voltage on 3638 CX054 pins 3 and 4 are back to 6.02 vdc 
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Feb 24, 2012 11:19 pm Post subject: |
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Also, Pins 8 and 7 have 5.35 Vdc on CX101
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Feb 24, 2012 11:21 pm Post subject: |
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| Jeremy112 wrote: | | The fuse is holding mac, voltage on 3638 CX054 pins 3 and 4 are back to 6.02 vdc |
Ok, back to front panel, CX101, DMM on DC and test for +5v with pins 8 for gnd and 7 for pos.. Dont let your leeds touch as this could be where the fuse blew.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Feb 24, 2012 11:23 pm Post subject: |
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Ok, good. We are done on that front board. So we now know if we find the problem the standby led should come on.
Give me a sec to look at the schematics again. I lost my thoughts with that ICP blowing.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Feb 24, 2012 11:25 pm Post subject: |
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| macgyver655 wrote: | Ok, good. We are done on that front board. So we now know if we find the problem the standby led should come on.
Give me a sec to look at the schematics again. I lost my thoughts with that ICP blowing. |
Cool, yeah that didn't help, thats for sure 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Feb 24, 2012 11:27 pm Post subject: |
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S404, is it on or off? I think I remember it's on.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Feb 24, 2012 11:36 pm Post subject: |
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| macgyver655 wrote: | | S404, is it on or off? I think I remember it's on. |
It is in the opposite position of the other 2 switches next to it, switched to the end with one pin and not the end with 2 pins (pins on each side of the switch)
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macgyver655
Joined: 22 Aug 2007
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| Posted: Fri Feb 24, 2012 11:41 pm Post subject: |
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| Jeremy112 wrote: | | macgyver655 wrote: | | S404, is it on or off? I think I remember it's on. |
It is in the opposite position of the other 2 switches next to it, switched to the end with one pin and not the end with 2 pins (pins on each side of the switch) |
Yes, it's on. Switch it off and plug in and main switch on and see if standby comes on. If no standby then unplug, leave that switch where it is and move S405 to the opposite, plug in and main switch on and check standby. If no standby then unplug and move switches back to where they were.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Feb 24, 2012 11:49 pm Post subject: |
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Still no standby Mac, the switches had no affect.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Feb 24, 2012 11:54 pm Post subject: |
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Ok, good. Still have the +6v? You'll have to test every now and then so we know if we lost it or not.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Feb 24, 2012 11:56 pm Post subject: |
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| macgyver655 wrote: | | Ok, good. Still have the +6v? You'll have to test every now and then so we know if we lost it or not. |
Tested it right after that, we're still good 
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macgyver655
Joined: 22 Aug 2007
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| Posted: Sat Feb 25, 2012 12:03 am Post subject: |
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Ok, were going to have to verify we have good power and gnd connections to the CPU. This will be unplugged. If it's easier to work around the CPU with the board removed you can remove it.
Locate the standup connector we used before, CN411. DMM on diode test, neg leed connected to pin 2 on that connector. Make it a good connect that you dnt have to hold. Also when you test on the CPU pins test high on the pin again, where it enters the chip.
So with neg leed on pin 2 of CN411 test the following pins on the CPU for dead short. 23,24,39,59,74,91,132,143.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Sat Feb 25, 2012 12:43 am Post subject: |
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With neg on pin 2 of CN411 all pins you specified, in that order tested as short, all 000 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Feb 25, 2012 12:52 am Post subject: |
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Very good. Now move that neg leed to pin 5 and test the following pins on the CPU: 15,21,41,57,76,93,130,140.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Sat Feb 25, 2012 1:38 am Post subject: |
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They all test short mac, sorry it took a while, but I wanted to be accurate
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