Dokert
Well-known member
First off this is NOT a for sale thread, and no list of buyers will be taken here.
Two different members have loaned me 720 harnesses to use as templates. Oddly enough both of them are hacked and trashed pretty closely the same. Just about every 720 harness that I have seen looks like one of these two or worse.
The main problem seems to be the "Switching / Linear" power supply. It has sense lines just like an Atari A/R II, but it doesn't have a R29 or R30 to burn up when it fails. Instead this bad boy burns up the ground side of the power headers on the video board and the cpu board.
The fix for most people is to just slap on some new connectors and call it a day. Others are a little more desperate and solder the power wires directly to the video board and the cpu board. The "Correct" fix would be to replace the burnt connectors AND the burnt headers.
CPU BOARD


VIDEO BOARD


Current Status with this Repro Harness.... Roughly, halfway done with the prototype.
I could really use a measurement for the speaker wires to the Audio II Board from the speakers.

Two different members have loaned me 720 harnesses to use as templates. Oddly enough both of them are hacked and trashed pretty closely the same. Just about every 720 harness that I have seen looks like one of these two or worse.
The main problem seems to be the "Switching / Linear" power supply. It has sense lines just like an Atari A/R II, but it doesn't have a R29 or R30 to burn up when it fails. Instead this bad boy burns up the ground side of the power headers on the video board and the cpu board.
The fix for most people is to just slap on some new connectors and call it a day. Others are a little more desperate and solder the power wires directly to the video board and the cpu board. The "Correct" fix would be to replace the burnt connectors AND the burnt headers.
CPU BOARD


VIDEO BOARD


Current Status with this Repro Harness.... Roughly, halfway done with the prototype.
I could really use a measurement for the speaker wires to the Audio II Board from the speakers.




