It uses a slow enough clock (25.175MHz) that most FPGAs can provide, yet enough resolution for most uses. Generally “Clamp st” set to 3 and “Clamp sp” sett to 4 will be optimal.Ī: Use RGB ADJUST potentiometers to correct colors.For my case, I was working with a 640x480 resolution, the most common VGA resolution for most use cases. Q: Black area on the screen, screen is too dark, or colors are not correct.Ī: Adjust “Clamp sp” and “Clamp st” while keeping “Clamp st” less than “Clamp sp”. You can also reset the GBS-8200 to its default 800×600 resolution by pressing DOWN/AUTO for 5 seconds and releasing.Ī: Use the position and zoom controls to adjust.Ī: Press DOWN/AUTO to initiate an auto scan. Q: “Input not supported” is displayed on the screen.Ī: Your monitor may not support all resolutions. Try pressing the SW button to change input sources. In addition to providing a GBS-8200 manual, the following are some common troubleshooting questions and answers:Ī: Check that both the input and output cables are connected and that the power to the GBS-8200/8220 is on. Connect back into the converter and power up then try the AUTO button again.Move the GRAY wire over one position on the connector (so it is next to the YELLOW wire).Remove the P11 wire harness from the converter P11 connector.

This should self-adjust and lock-in the picture on your VGA output monitor. Press the AUTO button on the GBS-8200/8220 PCB.Power up the GBS-8220 converter and wait 5 seconds.If the power supply is unable deliver 2amps, the GBS-8200 will behave erratically. Note: The power requirement for the GBS-8220 is +5VDC +/. Connector the power cable to P9 on the GBS-8220 converter PCB.Connect the RED wire of the power cable to the +5VDC source and the BLACK wire to the DC GROUND source.Or, use the included 5 pin RGB adapter cable and make the following connections:įor more information on the JAMMA Pinout go here.Ĭonnect the GBS-8220 PCB to your +5VDC Power Source:.The 5 pin RGB input header if your JAMMA connector already has one wired up (most common).To the 12 pin VGA header if your monitor has a ribbon cable.Ĭonnect the CGA, EGA, or YUV output from your JAMMA connection to:.The VGA OUT connector (sometimes labeled P4), if your monitor uses a 15-pin DSUB connector.No GBS-8200 manual would be complete without a board layout and diagram! The board is laid out as follows: GBS-8220 Manual: Basic Configuration and InstallationĬonnect the output monitor (your VGA monitor) to: Switching Power Supply (Center Positive).This is for adjusting the output if your picture has black spots or discolorations.

Switches input signal between YUV / RGBS / RGBHV.

Press and hold for 5 seconds, then release to reset the system. Press this key to auto scan for a CGA or EGA signal. Opens the on-screen-display (OSD) and works as the “enter” key.

Rgb to vga converter circuit diagram