Robotron Jon
Well-known member
I have a problem with my Qbert sound board.
The start up "Hello I'm Turned on" is not heard at power up, nor is the incoherent speech of Qbert when he dies, or when Coily falls off the board. When the master game sound pot is really cranked up I think I can faintly hear something when Coily falls off the board.
The power supply has been completely rebuilt. The all the caps on the sound board were replaced. I re-seated chips. The test beep works.
I've read through other postings on this, and it seems like this is most likely U13 (74LS05), but also possibly U12(7407) and U9 (74LS75).
Where can I find these chips and does anyone have any other advice? Since I seem to be faintly hearing something when Coily falls off should I attempt to adjust some of the pots on the sound board? I'm not sure what they are for, although I believe one of them balances out the speech and the other game sounds.
In addition, this issue happened when my power supply failed.
Thanks.
The start up "Hello I'm Turned on" is not heard at power up, nor is the incoherent speech of Qbert when he dies, or when Coily falls off the board. When the master game sound pot is really cranked up I think I can faintly hear something when Coily falls off the board.
The power supply has been completely rebuilt. The all the caps on the sound board were replaced. I re-seated chips. The test beep works.
I've read through other postings on this, and it seems like this is most likely U13 (74LS05), but also possibly U12(7407) and U9 (74LS75).
Where can I find these chips and does anyone have any other advice? Since I seem to be faintly hearing something when Coily falls off should I attempt to adjust some of the pots on the sound board? I'm not sure what they are for, although I believe one of them balances out the speech and the other game sounds.
In addition, this issue happened when my power supply failed.
Thanks.
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