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Author Topic: Almost dead A4000  (Read 1704 times)

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Offline doctorqTopic starter

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Almost dead A4000
« on: August 18, 2003, 11:04:01 AM »
Hi,

is there anybody out there that's very cool handeling a A4000 PSU?

I have pulled out all pins from the original PSU->Motherboard connector, and just inserted them pin by pin in the connector.

The PSU won't start up when all pins are in the connector, but if I remove the thick yellow cable, the PSU starts up. But that won't boot my migy... :-(

Anyone have the schematics for the A4000 psu? Mayby I connected the pins wrong; I sure hope I haven't blown up the motherboard because they are hard to find...
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Offline duesi

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Re: Almost dead A4000
« Reply #1 on: August 18, 2003, 12:08:44 PM »
I never heard about a defective A4000 PSU ...
(They are rock solid)
Have you removed the Motherboard from the case ?
If not then do so and check out the Power-connector
on the Motherboard... sometimes they are bad soldered. Look also at the plastic sheet underneath
the Board and make sure there's no shortcut
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A4000D CS060/MKII with SCSI, CV64/4MB, 128MB Fast, ACARD AEC-7720U SCSI-IDE,80GB Samsung HDD, Yamaha CDRW, XSurf2, OS3.9BB2
A500,1MB Chip Kick1.3/3.1,GVP A500+ 540MB HDD and 8MB Fast,GVP DSS 8Bit Sampler
 

Offline tonyw

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Re: Almost dead A4000
« Reply #2 on: August 18, 2003, 02:42:53 PM »
There were several different models of PSU supplied, and I've never seen a circuit for any of them.

But the PSU is as simple as a crystal set, there's nothing to it. What do you mean "it won't start up"? Do you mean that the fan doesn't spin up when you turn the power on?

tony
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Offline amigamad

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Re: Almost dead A4000
« Reply #3 on: August 18, 2003, 02:50:41 PM »
This site has info on a4000 socket connectors link here a4000 power conector :-)
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I once had an amigaone xe but sold it .

http://www.tamiyaclub.com
 

Offline Framiga

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Re: Almost dead A4000
« Reply #4 on: August 18, 2003, 02:57:06 PM »
Quote
by tonyw on 2003/8/18 15:42:53

There were several different models of PSU supplied, and I've never seen a circuit for any of them.

But the PSU is as simple as a crystal set, there's nothing to it. What do you mean "it won't start up"? Do you mean that the fan doesn't spin up when you turn the power on?


I agree for modern and cheaper ATX PSU but the A4000 PSU (mine was a Lite-On) was the "state of the art" of PSU.

There is an addictional an quite complex circuit inside (probably protection) that is very well designed. . . .no too simple :-)

Ciao


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Offline doctorqTopic starter

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Re: Almost dead A4000
« Reply #5 on: August 18, 2003, 03:00:04 PM »
Yes, the fan won't spin up when I turn the power on.

The motherboard has been removed from the case and I can't see something wrong with the motherboard, or the connector.
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Offline Framiga

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Re: Almost dead A4000
« Reply #6 on: August 18, 2003, 03:10:38 PM »
Check again the pins position in the PSU>MOBO connector.

Ciao
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