Amiga 1000 Won't Power

[3583Bytes]

I have an Amiga 1000 worked for a minute, I inserted the kickstart disk and I got the insert workbench screen. However the image was weird, it traveled downwards. We thought the monitor was to new or something.

I inserted a 256 memory expansion and tried to power it again. Nothing happened. the left power LED is constant RED, no blinking. There is no sound, no image, no floppy noises. We removed the 256 memory expansion, same thing.

Something must have broken in the first time we powered it on. I looked on the board, it seems ok, capacitors are all good, chips are all pushed in.

I have a spare Amiga 500 with all the chips, can try some of the Amiga 500 chips like Denise in the Amiga 1000 to say test if one of them is shorted?

Please help debug this problem, I would love to add this Amiga 1000 to my collection.

 

[ajk]

I would start by checking the power supply. Make sure it is providing the correct voltages to the motherboard. In the A1000 the power indicator LED should indeed blink when the computer is started.

 

[3583Bytes]

I would start by checking the power supply. Make sure it is providing the correct voltages to the motherboard. In the A1000 the power indicator LED should indeed blink when the computer is started.

I am worried that if is the power supply I am dead in the water. Unless I can convert an A500 PSU to work with the A1000 I don't have the skills to create a new PSU.

 

[bebek]

Lucky you A1000 is pretty common in Canada and States, hopefully somebody will help you with it. Unfortunately help from across the pond will be too expensive ... It looks like PSU had his last breath ...

 

[BLTCON0]

On the A1000 the PSU also provides the tick signal, so if the voltages measure OK it may be the tick circuitry that's gone bad.

Sadly on the A1000 there's no Vsync option like in the A2000 to bypass the PSU tick.

But I'm 99% sure that someone in the A1k forums has posted details on a replacement tick circuitry, so if that turns out to be the problem it should be at the very least possible to retrofit the replacement circuitry into the original PSU.

 

[3583Bytes]

Lucky you A1000 is pretty common in Canada and States, hopefully somebody will help you with it. Unfortunately help from across the pond will be too expensive ... It looks like PSU had his last breath ...

Are there any fuses in the A1000 PSU? Could I have blown something? Unfortunately my local Amiga club is all about the PowerPC Amigas. They don't really run or fix the classic Amigas.

 

[bebek]

Lucky you A1000 is pretty common in Canada and States, hopefully somebody will help you with it. Unfortunately help from across the pond will be too expensive ... It looks like PSU had his last breath ...

Are there any fuses in the A1000 PSU? Could I have blown something? Unfortunately my local Amiga club is all about the PowerPC Amigas. They don't really run or fix the classic Amigas.

PPC icard Youth of today .
There is a fuse but most likely some caps are dried and it does not start. Any RTV service should be able to help you test it.

 

[3583Bytes]

Lucky you A1000 is pretty common in Canada and States, hopefully somebody will help you with it. Unfortunately help from across the pond will be too expensive ... It looks like PSU had his last breath ...

Are there any fuses in the A1000 PSU? Could I have blown something? Unfortunately my local Amiga club is all about the PowerPC Amigas. They don't really run or fix the classic Amigas.

PPC icard Youth of today .
There is a fuse but most likely some caps are dried and it does not start. Any RTV service should be able to help you test it.

I don't know if it helps, but the fan spins so there is some power. I will measure the output tonight and examine the caps.

If anyone has any information on how to rebuild/replace the Amiga 1000 PSU please post it. Google has come back with very little info.

 

[BLTCON0]

See here. Section 1-4 is about testing the PSU.

You may replace Denise, Paula and the two CIA chips with known good ones from your A500 as well if you suspect the PSU is ok after all.

 

[3583Bytes]

See here. Section 1-4 is about testing the PSU.

You may replace Denise, Paula and the two CIA chips with known good ones from your A500 as well if you suspect the PSU is ok after all.

This is great, thanks

---------- Post added at 14:51 ---------- Previous post was at 14:37 ----------

The Amiga 1000 also has a daughter board. I am not sure what that's all about. Most of the images I see of an Amiga 1000 don't have it. If someone can educate me it would be great. I want to know if I should be testing with it plugged in, or if its some extra upgrade that I should remove for testing.

 

[roy_bates]

phoenix?

 

[BLTCON0]

See here. Section 1-4 is about testing the PSU.

You may replace Denise, Paula and the two CIA chips with known good ones from your A500 as well if you suspect the PSU is ok after all.

This is great, thanks

---------- Post added at 14:51 ---------- Previous post was at 14:37 ----------

The Amiga 1000 also has a daughter board. I am not sure what that's all about. Most of the images I see of an Amiga 1000 don't have it. If someone can educate me it would be great. I want to know if I should be testing with it plugged in, or if its some extra upgrade that I should remove for testing.

PAL Amiga 1000's are different from NTSC Amiga 1000's, they're redesigned to do away with the daughterboard. On the NTSC ones (like yours I'll bet, since you're in Canada) the daughterboard is meant to be there.

 

[3583Bytes]

See here. Section 1-4 is about testing the PSU.

You may replace Denise, Paula and the two CIA chips with known good ones from your A500 as well if you suspect the PSU is ok after all.

This is great, thanks

---------- Post added at 14:51 ---------- Previous post was at 14:37 ----------

The Amiga 1000 also has a daughter board. I am not sure what that's all about. Most of the images I see of an Amiga 1000 don't have it. If someone can educate me it would be great. I want to know if I should be testing with it plugged in, or if its some extra upgrade that I should remove for testing.

PAL Amiga 1000's are different from NTSC Amiga 1000's, they're redesigned to do away with the daughterboard. On the NTSC ones (like yours I'll bet, since you're in Canada) the daughterboard is meant to be there.

Thanks, yes Canada

 

[3583Bytes]

Its the PSU

Its the PSU

It looks like the PSU. I measured the output against what should be there and I am getting strange numbers. The PSU inside looks OK, dusty but capacitors all look ok.

Any chance to fix or make a new PSU. Anyone have a tutorial or document they can point me too.

 

[BLTCON0]

It looks like the PSU. I measured the output against what should be there and I am getting strange numbers. The PSU inside looks OK, dusty but capacitors all look ok.

Any chance to fix or make a new PSU. Anyone have a tutorial or document they can point me too.

For fixing refer to some technician.

For making a new one, keep in mind the A1000 needs +5, +12 and -5 volts, a lot of newer PC PSUs have parted with the -5V line.
So get a -5V supporting one suitably sized that its internals will fit in the elongated A1000 PSU casing and wire it accordingly. For ATX PSUs the PS_ON line must be kept tied to ground.
You must also replicate the tick signal, here's some info.

 

[ajk]

It's probably possible to rebuild the existing PSU. Just need to figure out which component or components are at fault. Might not need anything else except new capacitors, even if they look OK externally. But if you haven't worked on such things it would be best to consult someone with expertise, since there are high voltages and relatively large currents involved with power supplies.

 

[3583Bytes]

It looks like the PSU. I measured the output against what should be there and I am getting strange numbers. The PSU inside looks OK, dusty but capacitors all look ok.

Any chance to fix or make a new PSU. Anyone have a tutorial or document they can point me too.

For fixing refer to some technician.

For making a new one, keep in mind the A1000 needs +5, +12 and -5 volts, a lot of newer PC PSUs have parted with the -5V line.
So get a -5V supporting one suitably sized that its internals will fit in the elongated A1000 PSU casing and wire it accordingly. For ATX PSUs the PS_ON line must be kept tied to ground.
You must also replicate the tick signal, here's some info.

It's probably possible to rebuild the existing PSU. Just need to figure out which component or components are at fault. Might not need anything else except new capacitors, even if they look OK externally. But if you haven't worked on such things it would be best to consult someone with expertise, since there are high voltages and relatively large currents involved with power supplies.

Thanks,

It surprises me that no one has come up with a modern kit for an ATX conversion for the A1000. I mean a faulty PSU is probably a common problem for all Amigas. I have seen the A500 ATX conversion kit. But never an A1000.

For now I have cleaned and dusted the A1000 and placed it on my shelf, until I can either find a replacement or someone to fix it

 

[ajk]

The A1000 is less common as a hobby machine than pretty much any other model, that's probably the only reason. But that also means that you can get them for relatively little money, so obtaining a replacement should not be hard. Don't throw the old one away, though

 

[salaxi54]

One of the reasons the A1000 hasn't been ideally converted to ATX power is the size of the psu methinks. You couldn't fit a regular ATX in there without modding, unless you find one like they use in those mini htpc cases that have a small footprint. Plus the fact that there aren't that many people with A1000s thus very little demand i guess.
However, you could talk to Ian who appears to have studied Amiga psu's quite a bit, and even has an ATX adaptor for the A1000:
http://www.ianstedman.co.uk/Amiga/designs/Amiga_ATX_Adaptor/amiga_atx_adaptor.html

 

[3583Bytes]

One of the reasons the A1000 hasn't been ideally converted to ATX power is the size of the psu methinks. You couldn't fit a regular ATX in there without modding, unless you find one like they use in those mini htpc cases that have a small footprint. Plus the fact that there aren't that many people with A1000s thus very little demand i guess.
However, you could talk to Ian who appears to have studied Amiga psu's quite a bit, and even has an ATX adaptor for the A1000:
http://www.ianstedman.co.uk/Amiga/designs/Amiga_ATX_Adaptor/amiga_atx_adaptor.html

Thanks, if that adapter works it may actually save me.