Anyone free to fix this Falcon PCB?

[Steve]

Hi all,

I'm not currently doing modding work because of my commitments & study/apprenticeship, but a previous customer has contacted me who is experiencing SCSI issues.

Is there anyone else who can do some Falcon work? Otherwise, I'll see if I can arrange some time in the Holidays.

Thanks,

[HigashiJun]

Would be glad to help Steve, but I am not sure your customer would be eager to send his Falcon to Japan...

[Steve]

Thanks Jun

The problem has turned out to be something different now, after further inspection - the internal SCSI header made by C-lab seems to have 'burned out' and the traces have gone up in smoke... the guy will either need some patch-trace work done, or a completely new scsi connector board.

I have a theory now that C-Labs internal SCSI board just isn't well made & the traces just weren't designed to be thick enough. They're very very tiny for the voltage rails. Either that or it was just a defective PCB.

[frank.lukas]

.. think there was fire up the TermPower Line ?

[Steve]

.. think there was fire up the TermPower Line ?

Yes... check this. You can see previously I had patched some burned traces on the board, but now a trace at the front has completely gone up in smoke.

Atari C-Lab Falcon repair - Feb 2021 scsi board.jpg (304.8 KiB) Viewed 1690 times

[stephen_usher]

There must have been something really wrong with a device on the SCSI bus to do that. Possibly a terminator with a short? There should be minuscule amounts of current involved.

[frank.lukas]

The problem is that the internal C-Lab SCSI Adapter picks up everything on the onboard terminators and there is no Fuse !

Falcon_SCSI.jpg (92.96 KiB) Viewed 1657 times

[Rustynutt]

.. think there was fire up the TermPower Line ?

Yes... check this. You can see previously I had patched some burned traces on the board, but now a trace at the front has completely gone up in smoke.


Atari C-Lab Falcon repair - Feb 2021 scsi board.jpg

Have one CLAB adapter that looks normal, doesn't work. Never looked into it.
A guy in Spain sold some nice internal boards some years back, can't remember his name. Replaced the MKX boards with those, work great.
But, wow, that's scary looking

[HigashiJun]

Yes... check this. You can see previously I had patched some burned traces on the board, but now a trace at the front has completely gone up in smoke.


Atari C-Lab Falcon repair - Feb 2021 scsi board.jpg

Have one CLAB adapter that looks normal, doesn't work. Never looked into it.
A guy in Spain sold some nice internal boards some years back, can't remember his name. Replaced the MKX boards with those, work great.
But, wow, that's scary looking

Here's the guy's web site:

https://www.arananet.net/pedidos/produc ... -cosmos-ex

Still waiting for one but they are all "Out of stock"...

I guess @stephen_usher is right concerning the short on the terminator.