texasmame
Well-known member
*sigh*
Okay, Spy Hunter was working but having a few sound issues. Started to dick around after having done all the usual things (test voltages, reseat chips, etc.).
Remembered I had pulled off the purple reset wire back before I even started with the project. Thought I remembered where it went and that, somehow, hopefully, this would be the problem with the sound. So, I plugged it back in the hole. . .
or at least I THOUGHT it was the hole it came out of. Nope. It goes in #13 on CONN 4 on the power supply board and I put it in #14 on CONN 5. This produced a loud buzzing noise, which I presumed to be bad news. I checked the schemetic and tried the wire in the right hole to no avail.
Now, all I get is a solid white screen with some blocks of text and symbols on it. The PCB reset buttons don't work, 3 stack LED doesn't blink, Cheap Squeek LED does nothing (was playing faint and scratchy before). Nothing.
I'd start by swapping out the Z80 but I don't have a spare.
The power supply is still showing proper voltages at the caps, and the 5 caps on the top of the 3 stack are also showing 5v.
UPDATE:
If I take the 5v from CP47 on the sound I/O board, and tie that to R229 at the end closest to the connectors, the game will function again as it did before with the sound issues and faint Peter Gunn and whatnot. However, the screen is upside down now. Also, when the game is reset using the reset buttons on either PCB, the game hangs as described before until the 5v is removed and reapplied to R229.
Have I fried the reset circuit of the PCB?
What have I done here?!?
*feels shame*
Okay, Spy Hunter was working but having a few sound issues. Started to dick around after having done all the usual things (test voltages, reseat chips, etc.).
Remembered I had pulled off the purple reset wire back before I even started with the project. Thought I remembered where it went and that, somehow, hopefully, this would be the problem with the sound. So, I plugged it back in the hole. . .
or at least I THOUGHT it was the hole it came out of. Nope. It goes in #13 on CONN 4 on the power supply board and I put it in #14 on CONN 5. This produced a loud buzzing noise, which I presumed to be bad news. I checked the schemetic and tried the wire in the right hole to no avail.
Now, all I get is a solid white screen with some blocks of text and symbols on it. The PCB reset buttons don't work, 3 stack LED doesn't blink, Cheap Squeek LED does nothing (was playing faint and scratchy before). Nothing.
I'd start by swapping out the Z80 but I don't have a spare.
The power supply is still showing proper voltages at the caps, and the 5 caps on the top of the 3 stack are also showing 5v.
UPDATE:
If I take the 5v from CP47 on the sound I/O board, and tie that to R229 at the end closest to the connectors, the game will function again as it did before with the sound issues and faint Peter Gunn and whatnot. However, the screen is upside down now. Also, when the game is reset using the reset buttons on either PCB, the game hangs as described before until the 5v is removed and reapplied to R229.
Have I fried the reset circuit of the PCB?
What have I done here?!?
*feels shame*
Last edited:


