Wells Gardner Electronics Corporation

Monitor Terminology

Name Description
CAP KIT Consists of various values of elecrolytic capacitors.
CHASSIS The main deflection board where most of the monitors circuits and components are located. Usually there is a label on the board identifying the monitor. There will be a "WGM" or a "WGT" number, which is the release number of that monitor. On the same label there is a "054A" number, which is the chassis prep for that release number.
CHASSIS PAN The mounting surface for the chassis. It is a sheet metal subassembly that has studs or standoffs for mounting the deflection board.
CGA Stands for computer graphics adapter. This is a computer standard for video and sync signals going to a monitor. Also known as standard resolution which means using a horizontal frequency of 15KHZ.(KHZ is thousands of cycles per second of signal)
COMPOSITE SYNC This is a combination of the horizontal sync and the vertical sync signals. These signals are needed to keep the picture from rolling. Composite sync is used in most video arcade games.
CONTROL BOARD As the name suggests this board has the different controls for the monitor on it. The board is connected to the chassis or (deflection board) by a ring cable assembly. Some of the controls are for brightness or (black level), contrast, horizontal size, vertical size, and vertical hold. This board is sometimes called "The satellite board", by people in the field, repairing monitors.
CONVERGENCE This is a procedure using the yoke and the convergence rings to align the red, green, and blue guns in the picture tube. Usually a crosshatch pattern is used so that the three colors can be seen moving vertically and horizontally until they come together or converge.
CONVERGENCE RINGS Part of the ring assembly on the neck of the picture tube. There are two pairs of rings used to adjust or converge the three guns in the picture tube.
CRT Stands for cathode ray tube, which is the picture tube. Some people will refer to the whole monitor as the CRT or the CRT display.
DEFLECTION BOARD This is where the video signal usually plugs into. This board proceeds sync signals, and provides high voltage and deflection to get a full screen picture on the picture tube.
DEGAUSS COIL This is a coil of wire mounted to the picture tube that, uses AC voltage to demagnetize the tube when the monitor is turned on. This is done because if the picture tube gets magnetized the purity will off and the color on the screen will not be uniform. Picture tubes can also be degaussed manually with a hand held degaussing coil.
ELECTRON GUN Referred to as "gun" for short. There are three electron guns in the neck of the picture. There is one gun for each color; red, green, and blue.
FILAMENT Sometimes called the heater; this is a piece of metal in the neck of the picture tube that glows like the element in a toaster. The glowing filament heats up the guns in the tube and causes electricity to be forced to the front of the tube. This heating time is why there is a delay from power up to when the picture appears on the screen.
FLYBACK TRANSFORMER Provides high voltage, filament voltage, focus and brightness to the picture tube and is located on the deflection board. Also called the high voltage transformer.
GENERATOR Provides the video and sync signals to the monitor so that a test pattern can be seen on the screen for testing purposes. (GENIE ONE)
GEOMETRY This is the overall shape of the raster, involving the left and right sides. Poor geometry is when the sides are bowed out (barreled) or curved inward (pinned ). Good geometry is when the sides are straight up-and-down. On some sets this is done with the yoke and other sets have controls for correction.
GET WELL KIT This is a kit of parts used to fix a problem.
HORIZONTAL DEFLECTION Provided by the deflection yoke with a signal from the deflection board, giving the picture horizontal size.
HORIZONTAL MOUNT This is a mounting scheme whereby the picture tube is in the horizontal position. There are two side brackets with handles in them that the picture tube mounts to with four screws.
HORIZONTAL PHASE Sometimes called horizontal centering, position, or shift, this is a control that moves the picture to the left or to the right.
ISOLATION TRANSFORMER Used on the K7000 and K8000 monitors to help prevent electric shock to people working on them and to help keep the monitor from being damaged. The transformer isolates the monitor from the hot side of the AC line voltage coming from the power company.
LOW EMISSION The guns in a picture tube get weak and result in a dim picture or one gun will be weak and that color will not be as bright as the other colors.
MAIN BOARD Another name for the deflection board. Usually the largest board in the monitor and where most of three electronics is located.
MEDIUM RESOLUTION Sometimes referred to as "Mid Res", is a monitor that has a horizontal frequency of 25KHZ. (K8000, U5000, K7500, 33K3201).
NECK BOARD The board that fits on the neck of the picture tube. It has the video output circuits on it.
NTSC This is a video signal standard used on some monitors and is also used in televisions. This is composite video where the video and sync signals come to the monitor on one line.
PC BOARDS Often called a "PCB", which stands for printed circuit board. This is where the electronics is including components and foil traces to complete the circuits.
POTENTIOMETER Also called a "POT" for short and is used to set voltages or control functions of the monitor.
POWER SUPPLY Provides the power to operate the monitor. Uses AC voltage from the power company as the input and the output is a DC voltage which is the "B+" voltage to operate the monitor.
PURITY This involves adjusting the purity rings and the yoke to get a uniform color over the entire screen.
PURITY RINGS Part of the ring assembly, which includes the convergence rings and is mounted on the neck of the picture tube. The purity rings are used to center the raster and to adjust center purity on the picture tube. They are the pair of rings closest to the yoke.
REFURB This is a monitor that was returned or bought back and updated by changing parts or boards and tested like a production unit. The price is less than a new monitor and the warranty is 90 days rather than one year for new monitors.
REJUVENATE Some older picture tubes develop low emission making the picture dim or weak. These tubes can be connected to a machine (tube tester or rejuvenator) that can sometimes gives the tube more life and makes the picture brighter. This process is not permanent.
RGB Stands for red, green, and blue. This is the form of video that the monitors use. If the monitor uses an NTSC board, the output is RGB going to the monitor.
RING ASSEMBLY Three pairs of rings on the neck of the tube used for setting convergence and purity. These rings are actually magnets.
SHADOW MASK A thin piece of metal built into the picture tube near the front and behind three phosphor, and passes the beam from the gun assembly to the front of the tube. Can be damaged by shock or warped by head if the brightness is set too high and this causes dark areas in the picture.
SHORT CIRCUIT This is synonymous with a piece of wire. The least resistance to electricity. Electric current flows through it, but there is no voltage across it.
STANDARD RESOLUTION Sometimes referred to as "Low Res", is a monitor that operates at 15KHZ horizontal frequency. (U2000, K7000, K7200, K7300, K7400)
SYNC A transparent panel that is taped or bonded to the picture tube and is operated by touching it with your finger.
TOUCH SCREEN The touch screen controller sends signals to and receives signals from the touch screen.
TOUCH SCREEN CONTROLLER This is a combination of the horizontal sync and the vertical sync signals. These signals are needed to keep the picture from rolling. Composite sync is used in most video arcade games.
UNIVERSAL MOUNT Universal mount monitors can be mounted in different configurations. There is a bracket on the top and one on the bottom of the picture tube. There are two "U" channel brackets that can be mounted in five differen positions on the top and bottom brackets.
VERTICAL DEFLECTION Provided by the deflection yoke with a signal developed on the deflection board and gibes the picture vertical size.
VERTICAL MOUNT The mounting brackets are similar to the horizontal mount with the picture tube rotated 90 degrees, so that the long sides of the picture tube are up-and-down instead of side-to-side.
VGA Stands for video graphics adapter and includes various modes of resolution. The monitors that operate at VGA will work in modes 1,2, and 3 and some will work in mode 4, which is SVGA or SUPER VGA (800x600 mode)
WIDTH COIL Located on the deflection board and is adjusted to set the horizontal size.
YOKE The yoke is cone shaped with coils of wire for vertical and horizontal deflection of the picture and is located on the neck of the picture tube. The yoke is adjusted when setting purity and convergence.
YOKE TABS Strips with a magnet at one end and an adhesive at the other end. They are applied to the picture tube around the yoke to improve the convergence near the edges of the tube when needed.
 
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