this is my little friend I was in touch yesterday : The Atari Asteroids PSU:
Replaced F5 and did some measuring. Noticed that the schematics was somehow tricky and reworked the figures of the manual.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjM9WoXkWU0nxes4zgxv2bdisdDel2adsp_cfqKh6pXG9mCZJFvnySgyf5CA7KIGqgl_10oRxXo7nb9zO8DIeFsyRHFfCOPDrfbtD4zs7UvN4v22RYtuKqUoeAjJwIZQ2qjbcs4IQze50k/s320/psu-schema.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEimJedVpgwzDQOKGzyDk698_KRY2nCTnfvTr6UFYUT_vxsNHpAdm78TzU0ezp1IyeIAT1uJjXp9fPZbM3d9gZiyYRT1XGqZRdvP-HrAhSZYnxXl67c9VgeCCCLrN7HWzGnQruQEJtd5rR4/s320/Power+Supply+Wiring+diagram.jpg)
Measure point of GND is blue spot in Fig 3.
Measure points of fuses is the red spot. This should be the values
F2 vs F3 (7A)= ~15 VAC (VDC after diode cr1, cr2)
F2 vs F3 (3A)= ~36 VAC
F6 (3A) vs GNS= 6.3VAC
Measured
F2 - F3 -> 21V
F2,F3 vs GND -> 10,5V
F4 - F5 -> 38.3V
F4, F5 vs GND -> 19.15V
F6 vs GND : 14.45v
F6 vs F4 : 31.8V (yellow cables)
For first okay, since the load of the monitor is yet to come.
http://www.therealbobroberts.net/apsnotes.html
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