Spy hunter cockpit ssio volume control no work

ikarispy

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Recently got spy hunter working video and sound. But now the volume control for the ssio has no effect and is full bore loud. I put a meter on the pot and checked good. Bought a new pot just to be sure, and no change. Tried every combination with the three leads and nothing changes. The cheap squeak volume works fine. Could this be a ground issue? Anyone have a similar problem with their games?
 
Recently got spy hunter working video and sound. But now the volume control for the ssio has no effect and is full bore loud. I put a meter on the pot and checked good. Bought a new pot just to be sure, and no change. Tried every combination with the three leads and nothing changes. The cheap squeak volume works fine. Could this be a ground issue? Anyone have a similar problem with their games?
I suspect you have a problem on the SSIO board. The volume pot outputs a 0v-12v control voltage that feeds through an LM3900, through a resistor divider, into the preamp. Check this signal on your SSIO past the lm3900 (looks like D3 pin 9?) to make sure it's adjusting with the volume knob. Maybe something in that area is blown out.
 
I suspect you have a problem on the SSIO board. The volume pot outputs a 0v-12v control voltage that feeds through an LM3900, through a resistor divider, into the preamp. Check this signal on your SSIO past the lm3900 (looks like D3 pin 9?) to make sure it's adjusting with the volume knob. Maybe something in that area is blown out.

I'd make sure the pot wiring is good first, personally. (Maybe it's because I don't care for component level testing, but I digress.)

I've never seen SH guts in person, so I'm just assuming the pot is chassis-mounted and not stuck right on the board or anything. Check the outer legs of the pot, make sure it's getting +12VDC. Then attach a lead of your multimeter to the sense wire going into SSIO and the other to ground. If it doesn't change as you move the pot, and you've confirmed the pot is good, then you've got a wiring issue. (Note: if the SSIO was dragging the sense voltage down, the pot would go up in smoke!)

-E- Double check your pot! If you put +12V or ground on the middle tap there's a good chance you fried it.
 
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I'd make sure the pot wiring is good first, personally. (Maybe it's because I don't care for component level testing, but I digress.)

I've never seen SH guts in person, so I'm just assuming the pot is chassis-mounted and not stuck right on the board or anything. Check the outer legs of the pot, make sure it's getting +12VDC. Then attach a lead of your multimeter to the sense wire going into SSIO and the other to ground. If it doesn't change as you move the pot, and you've confirmed the pot is good, then you've got a wiring issue. (Note: if the SSIO was dragging the sense voltage down, the pot would go up in smoke!)

-E- Double check your pot! If you put +12V or ground on the middle tap there's a good chance you fried it.

That was it. The orange/black wire first pin on j3 was bad. Ran a jumper from the pot to pin to make sure. Everything a o k sound wise. Thanks for the help.
 
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