Asteriod deluxe Dead

starfighter2

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I have an Asteriods Deluxe that I am trying to repair and am somewhat new to the hobby. The monitor does not show a display and is black and at this point I have unplugged to try and get the game to just play blind, show blinking player buttons, or beeps, anything. At this point I don't get anything but a humming sound from the speekers.

I have changed out the Large cap from bob roberts on the power block as well as all the caps on the power regulartor board, the 2N3055 transistor, and the LM303 voltage regulator. l lowered the voltage from the pot of the regulator to its lowest point and I still get about 5.69 v (which I beleive to be to high) on the game board. no player buttons lit, no beeps, nothing. I also tried the self test switch with no different results.

On the game board I had changed all the caps and reset and cleaned the chips that I could.

Looking for some other suggestions to save this game.
Thanks
 
I would rather try to save it first. Really looking for ideas on how to fix this game so I can add it to my collection and play this favorite game....
 
Yup there's 2 resistors on there that help the "voltage sense" circuit work that are baked. Very very common and you can get the resistors at radio shack.

As far as it not working have you tried to coin it up to see if the lights blink?
 
I tested the diode in circuit an out of circuit. The in circuit test seemed to fail so I took out the diode and tested it out of circuit which seemed to pass. (Definition of pass is I got .285 in one direction and 1 in the other direction). One issue is that I cracked the diode after removal and so will need to replace anyway. I believe that bob Roberts is selling a 1N4007 which can be used as a substitute for (1N4001 thru 1N4007). The diode in the board is a iN4002.

I also tested the resistor next to that diode as others had recommended but that tested correctly at 10 ohms.

Any other ideas??
 
If thats what that diode is chances are radio shack has those. Note that Radio Shack at malls have less components than a shopping center Radio Shack.
 
I would think you should disconnect the game PCB until you get the +5V being too high fixed.

- Mike

For sure. Changing anything on the game board is a waste of time until you fix the 5.69 volts going to it. There is no point trying to get it to coin up or play when you have that kind of voltage going to the board.
 
I tested the diode in circuit an out of circuit. The in circuit test seemed to fail so I took out the diode and tested it out of circuit which seemed to pass. (Definition of pass is I got .285 in one direction and 1 in the other direction). One issue is that I cracked the diode after removal and so will need to replace anyway. I believe that bob Roberts is selling a 1N4007 which can be used as a substitute for (1N4001 thru 1N4007). The diode in the board is a iN4002.

I also tested the resistor next to that diode as others had recommended but that tested correctly at 10 ohms.

Any other ideas??

.285 is a BAD diode.

Go to Radio Shack *shutters* and pickup the diode there, they still have ones that will work.
 
That heat sink mounted transitor is a possible victim of bad diode and/or voltage.
 
Newbee Question: what should the reading be for a diode. I was told in the past that if there is voltage on one end and none on the other that the diode would be considered ok. Also, that diodes do not always test correctly in cuicit.

I will get another diode this week and try another test. As soon as I get the results I will post them. Thanks again for all the help from the community. Finally a Cool hobby with people willing to help.
 
Good reading in the right direction should be from around 400 to 650, and yeah it should only read in one direction unless its a special diode like a zener.
 
Sorry I have not posted back in some time as we lost power for 5 days up in nh. I did finally replace the two diodes (both 1N4002 so why not) and I get the same result. I did disconect the game to be safe and mesured on the power board on the +5 and ground contacts and get a range of 6.19 to 7.5 vdc when changing the pot back and forth.

Please let me know what else I should look for?
 
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