Universal Video Converter (UVC) PCB Troubleshooting Guide

Two UVC PCBs are in use, PN: 991-9015-00 and 990-UVC0000-PCB-03.
These PCBs are interchangeable except that the Ground and Horizontal Sync pins are switched.
The figure below shows the pin arrangement by part number for each PCB.

UVC DIP Switch Settings
SW 1 & 2	Both normally ON.
SW 3 Output Resolution	ON: CGA = 640 x 200 @ 15.72 KHz OFF: EGA = 640 x 384 @ 24.5 KHz
SW 4 and 5 Input Resolution	Both normally ON to auto detect the video resolution.
SW 6 H Sync Signal	Normally ON. Changing the H Sync signal will move the entire picture left or right. Change this setting if you find the picture is too far to one side and you cannot adjust it using the monitor control panel.
SW 7 V Sync Signal	Normally ON. Changing the V Sync signal will move the entire image up or down. Change this setting if you find the image is too far up or down on the monitor, and you cannot adjust it using the monitor remote control panel.
SW 8 H-V / Composite Sync	ON: Composite sync, for monitors with one composite (combined) sync line (most CGA monitors). OFF: For monitors with two separate H and V sync lines (most EGA monitors). Change this setting only if you have no picture on your monitor.

UVC Monitor Troubleshooting

Problem	Possible Cause	Possible Solution
No Picture on Monitor	Power Problem	Verify the AC power connection to the monitor. You can verify the monitor has power by looking for a small glow in the Neck of the CRT. Verify the UVC has power; the red LEDs should be illuminated.
	Blown fuse on UVC	Check fuses on UVC. Replace 5 Amp fuse if blown.
	Faulty Video Cable	Verify that the video signal wires and VGA cable are firmly connected to the UVC PCB.
	Faulty Monitor Chassis PCB	Verify that the fuses on the chassis PCB are good.
Picture is Dim or Faded	Monitors may grow dimmer as they age	Use the monitor remote control panel to adjust the brightness and contrast settings. Adjust monitor gamma from the Operator Menu to increase overall brightness. Some games also have contrast and brightness settings in the software.
Picture is Misaligned or Color is Poor	Incorrect UVC Settings	Check the DIP switches on the UVC and make sure they are correctly set for your monitor.
	Color is Poor	Use the monitor remote control panel to adjust the red, green, and blue color settings.
	Picture Geometry is Misaligned	Use the monitor remote control panel to adjust the height and width as well as other geometric adjustments. Check the UVC DIP switch settings.
	Distorted Colors on Screen	Use a degaussing coil or press the degauss button on the monitor remote control panel.