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Bright Dot in the center of the screen
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Was upgrading my Asteroids board, and I turned the game on to see a single dot in the middle of the screen. Game coins up and plays blind, but there is no deflection. Neck glow is present, and the Spot Killer light is lit. The plan is to recap the monitor, and replace the deflection transistors.
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Recapped and Replaced all Transistors.
| Fixed |
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Loud Hum #1
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loud hum heard over game sounds
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replaced big blue capacitor on power supply
| Fixed |
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ship fire and saucer fire sounds not right
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the players ship fire and the saucer fire sounds were very soft low pitched buzzes (bzzt, bzzt, bzzt)
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replaced 4016B at location M10 (rev 05 board) and now have the correct pew, pew, pew sounds for both ship fire and saucer fire
| Fixed |
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Loud Hum #2
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loud hum heard over game sounds that increases and decreases with volume control
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replaced LM324N op amp IC located at P12 (rev 05 board)
| Fixed |
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Asteroids No Boot / asteroids not booting
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P1 & P2 volcano LED solid.
Speaker buzz.
Main PCB LED illuminated.
No display, spotkiller LED sometimes on or dim.
5.05v could be measured at A/R with max adjustment of pot.
Measurement at 5v TP on main board was 4.95.
Chips were warm, no watchdog loop.
All edge connectors & wires had good continuity.
Noticed c5 clip mod was present. Not relevant to repair solution.
Getting to the point. Even though DC voltages were okay measured at the A/R board, AC test of big blue indicated presence of 3VAC.
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Big blue was original, manufactured 1978. Replaced with new.
Board now boots , responds to input, plays all sounds, p1 & p2 have good blink. Screen has display and spot killer is off, but horizontal collapse is present ("G05-801").
| Unknown |
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some asteroids lose brightness during play
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some asteroids lose brightness and disappear during play
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suspect monitor needs to be recapped and transistors replaced.
| Unknown |
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Asteroids No Boot / asteroids not booting
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P1 & P2 volcano LED solid.
Speaker buzz.
Main PCB LED illuminated.
No display, spotkiller LED sometimes on or dim.
5.05v could be measured at A/R with max adjustment of pot.
Measurement at 5v TP on main board was 4.95.
Chips were warm, no watchdog loop.
All edge connectors & wires had good continuity.
Noticed c5 clip mod was present. Not relevant to repair solution.
Getting to the point. Even though DC voltages were okay measured at the A/R board, AC test of big blue indicated presence of 3VAC.
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Big blue was original, manufactured 1978. Replaced with new.
Board now boots , responds to input, plays all sounds, p1 & p2 have good blink. Screen has display and spot killer is off, but horizontal collapse is present ("G05-801").
| Fixed |