Good news: I scored a Tron today.
Bad news: it has an audio issues. The game plays sound effects but no music. Any ideas?
Bad news: it has an audio issues. The game plays sound effects but no music. Any ideas?
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I guess I need to RTFM, because I can't figure out how to get it into test mode. I switched the switch into test position. Even tried power it on in the test position. Nada.
I reseated connectors, wiggled wires, etc. While wiggling wires on the input side of the sound amp (I presume it's the amp; board about 5x5 directly above the PCB stack) sound came on for a fleeting moment, then went away. I couldn't get it to come back. Tested power on the input side; 11.36 volts.
I did notice this that the purple wire on one of the power supply board connectors was cut. Any ideas? Is that for some ram mod, or something, or do I need to reconnect it?
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depending on what you care to do. (or have experience with)
I would pull that audio amp board (little 5x5 board as you referred to it)
reflow the solder to the header pins
If you have any capacitors, change the 3 caps that are on there (3 I think, can't remember)
with some standard caps if you don't have the axial leads. see what happens.
I would also remove the cable that connects the audio amp to the pcb stack and test for continuity between all the wires. Maybe one of the wires has a bad connector at this point.
(just a couple of ideas that you can do in the meantime while you wait for parts to get shipped).
you should be able to supply line level stereo audio to the amplifier board but start with the volume level low, you wont have front panel control.
Music is mixed into the game sounds on the SSIO board. If you are missing music but have game sounds I'd start by reseating the 8910's on the SSIO board. Might be the Z80 as will but probably not since you get normal game audio.
I'm pretty sure that the +12 supplied to the audio amp is unregulated. While +16 is high its not catastrophic.
It could be a simple issue like a bad 8910 (those two 40 pin IC's sitting next to eachother) or a bad 3900, bad 4016's. Lots to things to look at.
you should be able to supply line level stereo audio to the amplifier board but start with the volume level low, you wont have front panel control.
Music is mixed into the game sounds on the SSIO board. If you are missing music but have game sounds I'd start by reseating the 8910's on the SSIO board. Might be the Z80 as will but probably not since you get normal game audio.