A3000 Heating problem?

[boing4000]

Hello,

my name is Sascha and I am new to this forum. Im from germany so please forgive me some typing errors in my posts, I try to write as good as I can.

OK now to my problem with the Amiga3000 (Rev. 9/03) desktop.
The system works very stable and fine with the onboard MC68030/25MHz and ZIP RAM.
This changes when I plug in a A3640 CPU card (Rev 3.1) with well cooled MC68040/25MHz. At first the Amiga3000 works, floppys and harddrives are found and the CLI/WB starts up. Also the bootmenu works fine.
But this all for a maximum time of 4 minutes. After that time (sometimes earlier) the system freezes and the onboard 68030 COOCKS like hell! I smelled something like heating IC and touched the 68030, my finger was nocking red and I directly turned off the machine.
My finger is well again and so is the 68030. Everything works fine and there is no damage as far as I can tell.

My question is now, is this a common problem or maybe there is a timing problem somewhere? This A3640 CPU card works very fine in my A4000, no system crash and no overheating at all.
I did also check the voltages in both systems, 5V VCC is at 5.05V (with some .0x V tollerances in working system).
Is there any fix or maybe a component damage somewhere on the A3000 board?

Would be nice if someone can help me.
If not, the A3000 will do its work with the default 68030 CPU

Thanx and regards
Sascha

[Jeff]

There are about (3) jumpers that must be changed on the A3000 motherboard for the A3640 to work properly. I have a list of the correct ones to change, but I will not be able to get to it until tonight. Perhaps someone will reply with the correct jumper changes before then, if not then I will add them to this post.

-Jeff

[keropi]

off-topic:

hey Sascha, u sold me the csppc on ebay? a dce 233mhz one?
nice to find u here too  :lol:  :lol:  :-D  :-D

[AmiDude]

@boing4000

Set the following jumpers to the correct position:
 
J100: 3-4
J102: 2-3
J103: 1-2
J104: 2-3

See for more details this link:
Using the A3640 in an A3000

I'm using an A3640(rev. 3.1 with flat heat sink) in one
of my A3000's too, without any (heat)problems.

[boing4000]

@keropi
sorry but this was not me

@AmiDude
I did set the J102 also to EXT (1-2) and this was the cause of system stocking and suddenly overheating the 68030.
Now its working thanks a lot for the help!

AmiDude wrote:
@boing4000

Set the following jumpers to the correct position:
 
J100: 3-4
J102: 2-3
J103: 1-2
J104: 2-3

See for more details this link:
Using the A3640 in an A3000

I'm using an A3640(rev. 3.1 with flat heat sink) in one
of my A3000's too, without any (heat)problems.

[koaftder]

Problem fixed? Sweet