Amiga 3000 PCB layout/trace diagrams?

telemonster · 21 December 2022, 01:15

PCB Rev 9/02

Does anyone have a PCB layout to assist with troubleshooting? I have the schematics and they have been really helpful, but I could test damaged traces quicker with a layout guide.

The amazing Amiga PCB Explorer unfortunately doesn't have the A3000 boards but that is the type of info I am looking for.

The clock signals on the HSYNC and VSYNC from the VGA port are way off, but the RGB port works fine. I poked at the trimmer cap at VC470 but there is still something pretty wonky, and the PCB has a decent amount of crunchyness from the battery leak.

The RGB port work fine and the sync signals there are rock solid, so I am looking around the components around the NE564 at U481. The pin header at J483 should be 14 MHz and 24MHz I guess, and I am getting readings that are off and jumping all over. The signals found at J483 feed the Amber scan doubler.

Any leads on a PCB artwork diagram would be appreciated.

Breadcrumbs for others:
Schematics I am using are here:
https://www.amigawiki.org/dnl/schematics/A3000.pdf

Amiga PCB Explorer:
Great site, no A3000 yet though:
https://www.amigapcb.org/index.php

telemonster · 21 December 2022, 02:09

Well snap, progress happened fast.

Found this writeup with the freqs for the 14M/28M:
https://www.tsb.space/knowledge-base...nd-adjustment/

Checked clock for _VC1 at buffer after fat agus (U204 pin 2) 3.58MHz (NTSC)

Checked FB485 near U477, _VC1 from Fat Agnus present

Checked U477 pins 1 and 2, signal not good. So going to hunt.

telemonster · 21 December 2022, 04:14

Ooof PCB is worse off than I realized. Lots of traces with no continuity based on schematics. Definitely will need to do a lot of trace checks.

dalek · 21 December 2022, 05:55

Reamiga has what you need: https://www.reamiga.info/?page_id=40
SprintLayout free version will let you view the files and follow traces.

telemonster · 26 December 2022, 02:36

Thanks! I managed to open the Gerbers in KiCad and was able to reconstruct the traces around the signal generator, so the VGA output is working again. I am going to look through the schematic though and see what the other buffers in the IC are used for as I assume there could be issues there.

Props to the ReAmiga people.

Vypr · 26 December 2022, 12:06

Quote:

Originally Posted by telemonster

Thanks! I managed to open the Gerbers in KiCad and was able to reconstruct the traces around the signal generator, so the VGA output is working again. I am going to look through the schematic though and see what the other buffers in the IC are used for as I assume there could be issues there.

Props to the ReAmiga people.

If it helps, I have converted the Re-Amiga schematics to native KiCAD.

https://github.com/iansbremner/ReAmiga-3000---KiCAD

21 December 2022, 01:15	#1
telemonster Registered User Join Date: Apr 2020 Location: Northern Virginia Posts: 32	Amiga 3000 PCB layout/trace diagrams? PCB Rev 9/02 Does anyone have a PCB layout to assist with troubleshooting? I have the schematics and they have been really helpful, but I could test damaged traces quicker with a layout guide. The amazing Amiga PCB Explorer unfortunately doesn't have the A3000 boards but that is the type of info I am looking for. The clock signals on the HSYNC and VSYNC from the VGA port are way off, but the RGB port works fine. I poked at the trimmer cap at VC470 but there is still something pretty wonky, and the PCB has a decent amount of crunchyness from the battery leak. The RGB port work fine and the sync signals there are rock solid, so I am looking around the components around the NE564 at U481. The pin header at J483 should be 14 MHz and 24MHz I guess, and I am getting readings that are off and jumping all over. The signals found at J483 feed the Amber scan doubler. Any leads on a PCB artwork diagram would be appreciated. Breadcrumbs for others: Schematics I am using are here: https://www.amigawiki.org/dnl/schematics/A3000.pdf Amiga PCB Explorer: Great site, no A3000 yet though: https://www.amigapcb.org/index.php

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21 December 2022, 02:09	#2
telemonster Registered User Join Date: Apr 2020 Location: Northern Virginia Posts: 32	Well snap, progress happened fast. Found this writeup with the freqs for the 14M/28M: https://www.tsb.space/knowledge-base...nd-adjustment/ Checked clock for _VC1 at buffer after fat agus (U204 pin 2) 3.58MHz (NTSC) Checked FB485 near U477, _VC1 from Fat Agnus present Checked U477 pins 1 and 2, signal not good. So going to hunt.

21 December 2022, 04:14	#3
telemonster Registered User Join Date: Apr 2020 Location: Northern Virginia Posts: 32	Ooof PCB is worse off than I realized. Lots of traces with no continuity based on schematics. Definitely will need to do a lot of trace checks.

21 December 2022, 05:55	#4
dalek Registered User Join Date: Nov 2014 Location: NSW/Australia Posts: 462	Reamiga has what you need: https://www.reamiga.info/?page_id=40 SprintLayout free version will let you view the files and follow traces.

26 December 2022, 02:36	#5
telemonster Registered User Join Date: Apr 2020 Location: Northern Virginia Posts: 32	Thanks! I managed to open the Gerbers in KiCad and was able to reconstruct the traces around the signal generator, so the VGA output is working again. I am going to look through the schematic though and see what the other buffers in the IC are used for as I assume there could be issues there. Props to the ReAmiga people.

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