Blizzard IV 1230 MK won't work

[sirkope]

A new idea came up my mind, I haven't tested yet:

If I push both of mouse buttons, than turn on my amiga, a screen come up, where I can choose between booting devices, etc. Also has a page where I can see the installed equipments on the expansion port. I wonder if I see anything here ....

[CLS2086]

Hi, by SUPER-PSU I meant a good and strong PSU that deliver more than 4.86v for 5v under heavy use. If not, it will crash.
I have dying A500 PSU after i use them with my B1230-IV+FPU+SCSI+2x128mb.
At centisible, a 68882/50 cost around 25/30 euros...

[sirkope]

I'm not sure I could remove the battery but I "wreck" the brown tape around it. But still not working...

My PSU:

C= Commodore
Power Supply A 500
P/NO. 312 503-03

Input 220V~50Hz 0.4A T315mA T40/E
Output 5V 2.5A
      12V 1.0A
     -12V 0.1A

One more thing, maybe important:

When I used the turbo card without FPU, I connect the amiga with an a520 or a SCART cable to the TV. When I've installed the FPU, I only switch it on to check it's working.
One of my dream to get a scandoubler for the 1200, but the ebay ones recently selled ~140$ which is too much for me.
At once I've read an article about an RBG -> SVideo converter, and because I could buy the converter chip, I built an external converter with it, and - I've supplied with the amiga RGB port +12V pin. The circuit use about ~46mA, and when I test, and later use it the turbo card was installed. So I used an amiga 1200HD with an 1.6GB HDD, a Blizzard 1230 Mk IV turbo card, a 68882 FPU, 16MB Ram, and an external converter unit supplied from the machine.

But now, when I test I don't connect any monitor or TV, just switch it on, listen the HDD and watch the HDD Led, and if no HDD activity, I switched of.

When I try it without the card, HDD works, and system loads.

But some strange behaviour occured a few days ago, the machine hadn't operated about a month or two, and when I swithed on the HDD had a strange noise. So I decided to disassemble the machine, check the IDE cable, usually it works. But after I assembled it and wanted to switch on, it didn't worked, Even the power led. So I tought, my PSU cracked, and I wanted to measure the voltage levels, but because my voltage meter's battery runs out of charge, I couldn't do it. Next day I disassembled the machine more accurately, and after it started to work. And it works till then... Strange..

Anyway: I have an another A500 PSU, at my workplace, tomorrow I'll bring it to home to try it.

[rkauer]

 If I was you, I'll toss away those underpowered original PSUs and use this hack instead:



 Here is the external view:



 Where:

 Preto = Black
 Vermelho = Red
 Marrom = Brown
 Amarelo* = Yellow
 Branco = White

 * The guy who makes this make a BAD mistake. He puts the shield on the +5V line.

 Instead of this, put the yellow wire (shield) on ground (with the black wire). Do not put the shield wire in anything else (like the PSU ground itself).

 Any old peecee AT-PSU works.

 Just one more tip: peecees PSUs must have the "power good" (PG on the board) wired to +5V line in order to properly work.

[zipper]

Input 220V~50Hz 0.4A T315mA T40/E
Output 5V 2.5A
12V 1.0A
-12V 0.1A

2.5A is the puny one; the better do 4.5A

[sirkope]

Amiga 600 has a power supply for 5V/4.5A, probably I should buy one?

All my a500 PSU working well so I'm regret to cut the plug from it. Otherwise it's hard to find a kind of plug.

Koniconn has one 171-4405, Beckwith Electronics sells a Power Dynamics DP-215 ones.

[swift240]

I had your problem a long while back, to get rid of it, I  used a cotton bud and used some some CD lens cleaner and that done the job.

Mike.

[sirkope]

zipper wrote:

Input 220V~50Hz 0.4A T315mA T40/E
Output 5V 2.5A
12V 1.0A
-12V 0.1A

2.5A is the puny one; the better do 4.5A

I've tried with an another amiga PSU: 60W, 5V/4.3A, but still not working

[sirkope]

swift240 wrote:
I had your problem a long while back, to get rid of it, I  used a cotton bud and used some some CD lens cleaner and that done the job.

Mike.

I've already cleaned it, using contact spray and ear cleaning sticks. Although only through the expansion slot.
At the weekend I'll disassemble it more to reach the whole space.

[rkauer]

sirkope wrote:
Amiga 600 has a power supply for 5V/4.5A, probably I should buy one?

All my a500 PSU working well so I'm regret to cut the plug from it. Otherwise it's hard to find a kind of plug.

Koniconn has one 171-4405, Beckwith Electronics sells a Power Dynamics DP-215 ones.

 You don't need to cut anything, simply dessolder the cable from the orig. PSU and solder it  to the new one.

 Works like a charm. :-D

[TjLaZer]

@rkauer

* The guy who makes this make a BAD mistake. He puts the shield on the +5V line.

Is that a fact?

[sirkope]

Don't know,I haven't check it jet. Rkauer just suggest me a method converting an ATX PSU to support my amiga. Also he warned me, that there is a mistake in it that I should avoid.

TjLaZer wrote:
@rkauer

* The guy who makes this make a BAD mistake. He puts the shield on the +5V line.

Is that a fact?

[sirkope]

sirkope wrote:
At once I've read an article about an RBG -> SVideo converter, and because I could buy the converter chip, I built an external converter with it, and - I've supplied with the amiga RGB port +12V pin. The circuit use about ~46mA, and when I test, and later use it the turbo card was installed. So I used an amiga 1200HD with an 1.6GB HDD, a Blizzard 1230 Mk IV turbo card, a 68882 FPU, 16MB Ram, and an external converter unit supplied from the machine.

Ouch I wrote false info: not from +12V, I supplied from 23.pin (5V/100ma)

[rkauer]

 The +12V from the RGB port is "protected" by a resistor. Currents over 30mA can drop the voltage too much.

 Catch the +12V from another source (paralell port, external floppy, etc).

 +5V is protected in same way. But IIRC, the pin can supply up to 100mA. But with voltage drops (the very same as +12V line).

 Feed your external devices in other way, I advice you.

[sirkope]

I do not use +12V, only 5V.

I went to a kind fella this afternoon to try the card in a different a1200, but still didn't work.
I left it at him to try a few thing with it.