TheBasement
Well-known member
I have a Robotron which the sound would work upon startup. But after playing a game for a minute or 2, the sound would disappear. I put the probe on the power supply in the cab, and at the 7805 on the sound board. All voltages tested good. Hitting the sound test button on sound board produced the test sounds, even though the in-game no longer had sound. That meant good voltage and good amp. Turning off the game and back on again would again produce sound for a few minutes.
I pulled the board and suspecting the 6821 PIA I reflowed all the 6821 pins with a soldering iron and also reflowed the data line connector header pins. Instead of immediately testing (which I should have done), I pulled the sound board from my Joust and swapped ROMS. I put the joust sound board in the Robotron and the Robotron in the Joust. At this time both games are running with full sound for the last hour without cutting out.
Is it possible that the pins only needed to be reflowed, especially since it got sound for a few minutes before cutting out? Should I still replace the 6821 PIA, or do you think I am in the clear?
I pulled the board and suspecting the 6821 PIA I reflowed all the 6821 pins with a soldering iron and also reflowed the data line connector header pins. Instead of immediately testing (which I should have done), I pulled the sound board from my Joust and swapped ROMS. I put the joust sound board in the Robotron and the Robotron in the Joust. At this time both games are running with full sound for the last hour without cutting out.
Is it possible that the pins only needed to be reflowed, especially since it got sound for a few minutes before cutting out? Should I still replace the 6821 PIA, or do you think I am in the clear?
