Hey guys;
I'm working on a projector for a fellow PL member. I've installed a new set of scanners (faster ones) in an old Disco RGB projector from Goldenstar. I've also installed the newer projector electronics (SD card reader, LCD display, and main board that handles DMX inputs, interlocks, and switching between the card reader and the ILDA-in port) inside the projector to allow it to scan the stored artwork on the SD card at a full 30K. (The old board only went to 10K.)
So here's my problem: With everything hooked up, I get no X or Y output to the scanners, no matter if I'm running off the SD card or the ILDA port. The color signals are being passed on correctly, but I get no X or Y signals.
I'm concerned that I may be missing a key wiring harness. On the old projector there was a "min-max" potentiometer on the back. There were only two wires coming off it, and they went to a set of unlabeled pins on the old main board, right next to the microphone input. I'm assuming this pot was for size adjustment. But on the new board, there isn't any clear place to connect this pot.
Even more troublesome, there is a pin header with an "x size-line" and "y size-line" series of pins, but I have nothing to connect here. Each set is 3 pins, one set is labeled X+, XO, X-, and the other is Y+, YO, Y-. Note that these are completely separate from the X and Y signal outputs on the bottom edge of the board that I'm using for the scanners.
Finally, on the same pin header with the x and y size-line pins, there are two pins near the top (just below the microphone input pins) that are not labeled on my drawing, but on the board are labeled RP1 and RP2. I have no clue what they are for.
So here's the rub: I've contacted Goldenstar about this, but everyone there is on Holiday, and Mimi herself isn't sure what is supposed to be connected to these pins, if anything. I wanted to get this projector finished this weekend, but without more information I'm stuck. Does anyone have any experience with these Goldenstar boards that are used in their Disco RGB projectors?
Here is a drawing of the board I'm talking about. Note the long pin header on the right - that's where the X and Y size line pins are located.
Things I have already tried:
1) connecting the pot on the back of the projector to the RP1 and RP2 pins. No effect
2) connecting a 10K pot across the X- and X+ pins on the size line header with the pot wiper connected to X0. No effect
3) installing a shorting block between X- and XO, and alternately between X+ and XO. No effect
Anyone got any more ideas?
Adam