jjvaughn83
New member
I have a 1979 Asteroids upright original, unsure of the version of the PCB. The PCB has been repaired in the past (has asteroids written at the edge connector in sharpie, like it was in a pile of others).
Symptoms:
-Game play seems to be fine. Start buttons blink, audio is working.
-Game will start but no ship is shown. Just a white hot dot. Bullets can be seen and all controls seem operational.
-About 50% of the asteroids show correctly. When they don't show, they are a white dot like the ship. Once visible larger asteroids are shot and they break up, they always turn into dots.
- UFO can not be seen but audio let's me know it is on the screen.
-It will play all day, keep score, take your hi-score, etc. etc. Only issues are with the video.
-I've played with brightness, contrast, x/y pots. Some improvement but still missing ships, partial asteroids and UFO.
- 4.8V (+/- 0.1) is found all over the PCB in multiple areas.
Test Mode: No cross hatch on screen. DIP settings show in the center and fuzzy white dots (1/4" dia) in corners (lower left, upper right)
Test Mode Audio (3 medium tones then 1 low tone) is identifying RAM "R4" failed self test.
Changed the Vector generator Rom at N/P3 with a new one from Steph. (I fried the old one reversing polarity after cleaning)
Next step: Ordered new 2114 chips (and sockets) from Jameco to replace all 4 of the vector generator RAMs (R4, P4, M4, N4). Also coming is a logic probe so I can really get into troubleshooting this board.
Question: Is there supposed to be audio in the Attract mode of this cabinet? Mine is dead silent.
Symptoms:
-Game play seems to be fine. Start buttons blink, audio is working.
-Game will start but no ship is shown. Just a white hot dot. Bullets can be seen and all controls seem operational.
-About 50% of the asteroids show correctly. When they don't show, they are a white dot like the ship. Once visible larger asteroids are shot and they break up, they always turn into dots.
- UFO can not be seen but audio let's me know it is on the screen.
-It will play all day, keep score, take your hi-score, etc. etc. Only issues are with the video.
-I've played with brightness, contrast, x/y pots. Some improvement but still missing ships, partial asteroids and UFO.
- 4.8V (+/- 0.1) is found all over the PCB in multiple areas.
Test Mode: No cross hatch on screen. DIP settings show in the center and fuzzy white dots (1/4" dia) in corners (lower left, upper right)
Test Mode Audio (3 medium tones then 1 low tone) is identifying RAM "R4" failed self test.
Changed the Vector generator Rom at N/P3 with a new one from Steph. (I fried the old one reversing polarity after cleaning)
Next step: Ordered new 2114 chips (and sockets) from Jameco to replace all 4 of the vector generator RAMs (R4, P4, M4, N4). Also coming is a logic probe so I can really get into troubleshooting this board.
Question: Is there supposed to be audio in the Attract mode of this cabinet? Mine is dead silent.
