get any 'tones' when you power on the game?
When the system 11 games boots, it produces power-on tone(s). Here is the breakdown of the tone(s):
No Sound: sound/speech board is not operating, or a failure is affecting the sound circuitry (broken or disconnected cable, dead amplifier, bad speaker).
One Tone: sound/speech system OK.
Two Tones: sound/speech RAM problem.
Three Tones: U4 problem.
Four Tones: U19 problem.
CPU Sound Diagnostic Switch SW1.
On the left side of the CPU board there are two switches. The top switch SW1 is the sound diagnostic switch.
If you press this button, you should get two test sounds. This shows that the CVSD (Continuously Variable Slope Delta)
modulator, which produces the game's voices, and the DAC (Digital to Analog Converter) sound circuits are working.
After pressing CPU switch SW1 you should get some tones. Here is the breakdown:
No Sound: sound/speech board is not operating, or a failure is affecting the sound circuitry (broken or disconnected cable, dead amplifier, bad speaker).
One Tone: U23 RAM chip error.
Two Tones: U21 ROM chip error.
Three Tones: U22 ROM chip error.
Four Tones: U21 ROM chip error.
Five Tones: U22 ROM chip error.