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Author Topic: As bad days go, this is one!  (Read 522 times)

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Offline curtisTopic starter

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As bad days go, this is one!
« on: December 15, 2014, 12:08:59 AM »
So, I was working on my 3000D getting it ready for market since I don't use it and it should go to someone who would appreciate it.

Anyway, was trying to get the floppy to work and set a replacement drive on top of the currently installed drive and transferred the power and signal cable.

Hit the power button and accidentally brushed the replacement drive and it slipped and shorted out against the other drive.

Loud POP!

Computer died.

Pulled the power cord off, removed the offending floppy drive from it's precarious perch and disconnected all cords from it.

Reinstalled power cord and pressed the power button.

Nothing.

Nada.

Absolutely no signs of life.  Hard drive doesn't spin up.  No power LED.  No joy.

So, my question, before I start checking pieces out in other machines:

How likely is it I fried the motherboard?  Or did I (hopefully) just kill the power supply?

If the power supply is the only victim, anybody got a suggestion for a replacement?  I noticed amigakit has an adapter for using an ATX power supply, but has anyone adapted an ATX to fit in the 3000D case?

Waiting patiently for answers.

Curtis
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Offline Jeff

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Re: As bad days go, this is one!
« Reply #1 on: December 15, 2014, 12:13:25 AM »
There is probably a line or mains fuse soldered or clipped right to the power supply board. You will need to remove the power supply and take off the cover to find it. They are usually easy to replace.  Next time try using a sheet of cardboard or plastic between the drives when testing...
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Offline Plaz

Re: As bad days go, this is one!
« Reply #2 on: December 15, 2014, 12:17:25 AM »
If you shorted just the power lines, then hopefully just a fuse in the power supply.  However it was always too easy to zap the line drivers and CIA chips on the 3000 mother board. I'd first try disconnecting the power supply from every thing except an old hard drive and see if it' spins it up.

Plaz
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Offline Vlabguy1

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Re: As bad days go, this is one!
« Reply #3 on: December 15, 2014, 12:35:33 AM »
Quote from: curtis;779825
So, I was working on my 3000D getting it ready for market since I don't use it and it should go to someone who would appreciate it.

Anyway, was trying to get the floppy to work and set a replacement drive on top of the currently installed drive and transferred the power and signal cable.

Hit the power button and accidentally brushed the replacement drive and it slipped and shorted out against the other drive.

Loud POP!

Computer died.

Pulled the power cord off, removed the offending floppy drive from it's precarious perch and disconnected all cords from it.

Reinstalled power cord and pressed the power button.

Nothing.

Nada.

Absolutely no signs of life.  Hard drive doesn't spin up.  No power LED.  No joy.

So, my question, before I start checking pieces out in other machines:

How likely is it I fried the motherboard?  Or did I (hopefully) just kill the power supply?

If the power supply is the only victim, anybody got a suggestion for a replacement?  I noticed amigakit has an adapter for using an ATX power supply, but has anyone adapted an ATX to fit in the 3000D case?

Waiting patiently for answers.

Curtis


Oh boy.. I see this more and more.. people messing with a working machine and then zappo..

fingers crossed its just the PS.
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Offline mechy

Re: As bad days go, this is one!
« Reply #4 on: December 15, 2014, 02:08:23 AM »
Quote from: Vlabguy1;779831
Oh boy.. I see this more and more.. people messing with a working machine and then zappo..

fingers crossed its just the PS.

Sadly,in 20+ years of messing with amiga's i have seen this many times,its a sad thing.
I always plug in some power Y cables to extend power to keep stuff away from the machine. I have heard of one guy who dropped his drives into a 4060 accelerator and killed it.. ouch!

see if the fan spins up on the psu, if not the problem is in the psu likely.. you could also check with a multimeter. Hopefully it just killed the fuse.

good luck!

p.s. its possible to fit a microatx board in the 3000 case, but its gotten hard to find them with -5v,since it was deleted from the atx standard.

wow first check http://www.ebay.com/itm/Lot-of-2-Micro-ATX-250W-Power-Supply-P4-12V-/271701314452?pt=PCA_UPS&hash=item3f42a90b94
2 of them,supposedly new, check for sure, but magnifying the label i see -5v listed.
You might double check the model on the athena site to make sure measurements are actually the microatx.
 just FYI athena brand stuff is kinda hit and miss, ive had dead ones out of the box and ones that seem to run forever.
« Last Edit: December 15, 2014, 02:16:35 AM by mechy »
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Offline curtisTopic starter

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Re: As bad days go, this is one!
« Reply #5 on: December 15, 2014, 03:43:21 PM »
Well, fresh day, fresh outlook.

Checked the power supply fuse and as suspected, it was blown.

Just for testing purposes, bypassed the fuse with a bit of wire wrap wire and tested the power supply with a floppy drive attached.

No joy.

To make sure, tried again with a hard drive.  Same result.

It appears the power supply is in fact DOA.  Hopefully it didn't take an honor guard with it!

I see that amigakit has an ATX to 3000 adapter with switch for $20.61.  Has anyone done the ATX conversion on a 3000D?  If so, how much of a pain is it?

@vlabguy1:  The machine itself was fine.  However, the floppy was becoming a bit dodgy and I was checking out a replacement!
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Offline ElPolloDiabl

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Re: As bad days go, this is one!
« Reply #6 on: December 15, 2014, 04:08:12 PM »
If nothing touched the motherboard, there is no reason it would be damaged.

Someone with more knowledge might be able to tell you which chip is most likely to burn out in the power supply. Probably a voltage regulator, but just guessing.
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Offline curtisTopic starter

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Re: As bad days go, this is one!
« Reply #7 on: December 15, 2014, 08:10:11 PM »
Just finished fitting a new fuse vice the wire wrap bypass and confirmed all voltages are NOT present.  Fact is, none of the voltages are what they're supposed to be.

As far as the fan, since it's 12V, that pretty much re-confirmed no good output voltages.

Will check out that auction and see what's what.

Curtis

Quote from: mechy;779837
Sadly,in 20+ years of messing with amiga's i have seen this many times,its a sad thing.
I always plug in some power Y cables to extend power to keep stuff away from the machine. I have heard of one guy who dropped his drives into a 4060 accelerator and killed it.. ouch!

see if the fan spins up on the psu, if not the problem is in the psu likely.. you could also check with a multimeter. Hopefully it just killed the fuse.

good luck!

p.s. its possible to fit a microatx board in the 3000 case, but its gotten hard to find them with -5v,since it was deleted from the atx standard.

wow first check http://www.ebay.com/itm/Lot-of-2-Micro-ATX-250W-Power-Supply-P4-12V-/271701314452?pt=PCA_UPS&hash=item3f42a90b94
2 of them,supposedly new, check for sure, but magnifying the label i see -5v listed.
You might double check the model on the athena site to make sure measurements are actually the microatx.
 just FYI athena brand stuff is kinda hit and miss, ive had dead ones out of the box and ones that seem to run forever.
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Offline amiman99

Re: As bad days go, this is one!
« Reply #8 on: December 15, 2014, 08:45:56 PM »
I was able to transplant small factor AT power supply to A4000 PS case, works fine so far.
It may work on A3000.
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Offline curtisTopic starter

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Re: As bad days go, this is one!
« Reply #9 on: December 15, 2014, 09:13:19 PM »
Well, I pulled the trigger on an Athena AP-MP4ATX30.  Looks like it has all the right voltages and is almost exactly the same size.  Will wait and see.

Guess we can put this thread on hold until the power supply comes in and probably after Christmas!
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Offline spirantho

Re: As bad days go, this is one!
« Reply #10 on: December 16, 2014, 08:18:34 AM »
Dunno if this helps at all but most floppy drives can be brought back from being dodgy. It's usually dirt in the switches at the front of the drive, particularly the one which tells when a disk is inserted. Spraying some contact cleaner into that little plastic switch has saved many of my drives.... plus getting rid of 25 years of dirt from the rest of the mechanism is a good idea too!
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Offline curtisTopic starter

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Re: As bad days go, this is one!
« Reply #11 on: December 20, 2014, 10:45:16 PM »
Got the Athena power supply in.  Talk about almost a perfect fit!  It's just a little taller than the original power supply.

Will remove the power supply board from its case leaving the bottom half as a shield.

The fan is the same size, so will move the new fan over.

Solder the power leads from the old power supply keeping the switch.

Transplant the new power supply with the bottom half of the case and wait for the Amigakit adapter plug!

Life is starting to look up a little.
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Offline Plaz

Re: As bad days go, this is one!
« Reply #12 on: December 21, 2014, 03:39:55 AM »
Start out small when you start testing again. Bare mother board, no floppies, no HD or add-on. Quick on/off on the power supply to see if the power led lights ok. If so, then go for a longer test still with bare mother board. Watch every thing close for any unusual heat or noises. If any thing looks weird, shut down. Then on to adding drives and add-ons. After this kind of zapping, you don't want to move to quickly and have a bad part on the mother board back-fire and take out the new supply, burn a drive or even more parts on the  board. Tedious steps from long experience with reviving cooked systems.

Plaz
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Offline curtisTopic starter

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Re: As bad days go, this is one!
« Reply #13 on: December 21, 2014, 04:16:15 PM »
Trust me Plaz, I hear you!

You did forget one thing to watch out for.  Smells!
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Offline ElPolloDiabl

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Re: As bad days go, this is one!
« Reply #14 on: December 21, 2014, 04:41:36 PM »
Anything that has power running through it including the parallel port is what you have to be careful of.
Is it possible you could get an electrical build up because something has a poor connection to the chassis (which is acting as ground). Check that too.
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