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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Erol on February 06, 2015, 02:28:11 PM

Title: A3000D Dead Power Supply
Post by: Erol on February 06, 2015, 02:28:11 PM

Does anyone know if these can be repaired?
ive seen a few threads on replacing with a PC power supply.

Title: Re: A3000D Dead Power Supply
Post by: don27dog on February 06, 2015, 02:37:17 PM

3000D is super easy. http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=1164

I wish they would make one of these adapters for my 3000T

Title: Re: A3000D Dead Power Supply
Post by: Erol on February 06, 2015, 04:34:22 PM

Quote from: don27dog;783184

3000D is super easy. http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=1164

I wish they would make one of these adapters for my 3000T

I was considering that route with AmigaKit ATX adaptor, but which ATX power supply size wise will fit the Amiga?  Mini ATX?   and what about the power switch?

Title: Re: A3000D Dead Power Supply
Post by: SpeedGeek on February 06, 2015, 05:40:55 PM

Quote from: Erol;783183

Does anyone know if these can be repaired?
ive seen a few threads on replacing with a PC power supply.

 I repaired my A3000 PSU a few years ago, but it's probably not something for someone to attempt without previous repair experience. ;)

Title: Re: A3000D Dead Power Supply
Post by: Oldsmobile_Mike on February 06, 2015, 06:27:07 PM

Quote from: Erol;783190

I was considering that route with AmigaKit ATX adaptor, but which ATX power supply size wise will fit the Amiga?  Mini ATX?   and what about the power switch?

I believe there was just a thread on this a couple months ago.  Someone made a recommendation on a PSU that was supposed to fit.  Have you searched the forums?   Sorry, that's all I've got!  Good luck!

Title: Re: A3000D Dead Power Supply
Post by: curtis on February 06, 2015, 07:07:52 PM

This is the thread you're looking for.

http://www.amiga.org/forums/showthread.php?t=68541

BTW, it worked like a charm!

Title: Re: A3000D Dead Power Supply
Post by: Tenacious on February 06, 2015, 07:12:27 PM

Quote from: Erol;783190

I was considering that route with AmigaKit ATX adaptor, but which ATX power supply size wise will fit the Amiga?  Mini ATX?   and what about the power switch?

IIRC, the A3000D PS has an extra signal not common to other power supplies, even most of the other Amigas don't have it.  It is a 60 Hz AC signal (probably low voltage) that I believe was used for timing of the native video on the motherboard (maybe the FF?).  I can't remember.  

Naturally, the Amigas date to a time before the 3.3 VDC power rail.

I imagine Amigakit is on top of all of this with their adapter.

Title: Re: A3000D Dead Power Supply
Post by: Oldsmobile_Mike on February 06, 2015, 07:24:08 PM

http://www.amiga.org/forums/showthread.php?t=67943

Title: Re: A3000D Dead Power Supply
Post by: Erol on February 06, 2015, 08:18:12 PM

Quote from: curtis;783200

This is the thread you're looking for.

http://www.amiga.org/forums/showthread.php?t=68541

BTW, it worked like a charm!

Thank you all for your help.

I will certainly look at using an miniatx power supply.   seems the most wise solution.  Big Thank you!

Title: Re: A3000D Dead Power Supply
Post by: SpeedGeek on February 06, 2015, 08:24:19 PM

Quote from: Tenacious;783201

IIRC, the A3000D PS has an extra signal not common to other power supplies, even most of the other Amigas don't have it.  It is a 60 Hz AC signal (probably low voltage) that I believe was used for timing of the native video on the motherboard (maybe the FF?).  I can't remember.  

Naturally, the Amigas date to a time before the 3.3 VDC power rail.

I imagine Amigakit is on top of all of this with their adapter.

AFAIK all Amiga PSUs (except for the A4000 PSU) provide a 50/60 Hz Tick signal. However, most (but not all) Amiga mobos have a jumper which selects the Tick or Video blank signal for the system (CIA) timer.

So you can use a generic PSU with these jumper select mobos. The catch is when you switch from NTSC/PAL or to exotic video modes like Super72 then your system timing gets messed up. Also, you can't disable the Video signal with RTG software.

Title: Re: A3000D Dead Power Supply
Post by: magnetic on February 07, 2015, 02:38:29 AM

FYI the A3000 has a jumper to generate TICK. Ive seen the Amigakit a3k adaptor withmicro atx psu working nicely !

Title: Re: A3000D Dead Power Supply
Post by: Erol on March 07, 2015, 05:10:00 PM

Well I got A3000D  up and running.  thanks for all that helped, and the TICK advice was very helpfull.
I've even managed to install a nice new battery and clean the motherboard with some pcb cleaner.  Once I have the powers supply installed I may upload more pics.

Next job repairing A2000 from a leaked battery..  luckily i think she is repairable.

Title: Re: A3000D Dead Power Supply
Post by: Erol on March 07, 2015, 05:59:20 PM

must be my lucky day,  changed the fuse inside the original power supply 1amp and its now working..  :)    I now stuck on to use original or use AtX duel voltage power supply.

Title: Re: A3000D Dead Power Supply
Post by: danbeaver on March 07, 2015, 11:21:56 PM

Yeah...

I usually go check the fuse first.

Title: Re: A3000D Dead Power Supply
Post by: magnetic on March 07, 2015, 11:27:04 PM

Id use the original psu until it fails.. as the a3k case is designed for it specifically. Though like i said  a mini itx or micro atx sff psu fits nicely as well but leaves a square hole in the back.

Title: Re: A3000D Dead Power Supply
Post by: QuikSanz on March 07, 2015, 11:35:56 PM

@Erol,

If you have the know how change out the old capacitors in there. Will last forever.

Chris

Title: Re: A3000D Dead Power Supply
Post by: magnetic on March 08, 2015, 12:15:04 AM

I wouldnt recommend no pro electrical guys working on psus

Title: Re: A3000D Dead Power Supply
Post by: QuikSanz on March 08, 2015, 12:32:03 AM

@magnetic,

Should have put "know how" in quotes on that. lol

Title: Re: A3000D Dead Power Supply
Post by: Erol on March 21, 2015, 03:37:45 PM

Quote from: QuikSanz;785973

@Erol,

If you have the know how change out the old capacitors in there. Will last forever.

Chris

Thanks Chris will do..  i just need to buy some.

Title: Re: A3000D Dead Power Supply
Post by: Erol on March 21, 2015, 03:39:28 PM

Quote from: magnetic;785971

Id use the original psu until it fails.. as the a3k case is designed for it specifically. Though like i said  a mini itx or micro atx sff psu fits nicely as well but leaves a square hole in the back.

You read my mind,  i will keep atx one as a spare for now.