I decided to rebuild my asteroids audio/regulator board. This is very important to do , most of the components have been inside sins 1979...
before starting, just wan say a big THANKS to "Mr PINX" for is help and sharing knowledge ....
First let's take a look at what we need to change....
in yellow: this is the transistor part 2N3055
in dark blue: transistor part 2N6107
in white : 3 capacitor 470uf 25v
in green : 2 capacitor 33000uf 35v and 1 1000uf 25v
in red: 2 capacitor 10uf 35v
and in clear blue 2 transistor 2n3904
here is where I keep all the spair parts...
best tool to use is a desoldering iron....i recomand to practive on dead boards just to be safe and to get you use to it ...
here are al the components removed...always good to take a picture before taking them out, to remember where to put the new ones...
here is the board with all all components removed
each new capacitors, are place on the board, BECAREFULL !!!! to fallow there polarity...
most capacitor show you where the ( - ) negative is flowing ...this is very important ...look where the (+) is indicated on the board.
when place...just solder it, and cut the excess wire...
here is the board finish ...all capacitors and transistors in place ...
here a better picture ...look at the arrows showing you the minus polarity on the capacitors...
attached to the heatsink on the right the last 2 component are "amp" for the audio sound...
you can replace them with parts: TDA2002.
This is one of the 2 (2N3904) transistors to change ....(in black)
when power on, voltage need to bee check and adjust...+5 is done via the molex on the pcb...
if you have any questions, or ....if you need any of this parts, contact me ...
and if you don't feel comfortable, I can also repair it for you ....
happy gaming ...
ps: same thing can be done for tempest, and star wars audio board...
and on many ATARI games
