DIAGNOSTIC
# MODE RES. KHz/Hz PATTERN FUNCTION
1 VGA

640 x 480 31.5 / 60 Red Screen Purity Test
2 VGA

640 x 480 31.5 / 60 Green Screen Purity Test
3 VGA

640 x 480 31.5 / 60 Blue Screen Purity Test
4 VGA

640 x 480 31.5 / 60 Black Screen Blank Raster Test
5 VGA

640 x 480 31.5 / 60 White Screen High Voltage Test, Purity Test
6 VGA

640 x 480 31.5 / 60 White Outline Border High Voltage Test, Pincushion Test
7 VGA

640 x 400 31.5 / 70 Magenta Squares Convergence Test
8 VGA

640 x 400 31.5 / 70 White Squares Convergence Test, Linearity Test
9 VGA

640 x 480 31.5 / 60 Color Bars Sync Rate Test, Color Balance Test
10 SVGA1 800 x 600 35.2 / 56 Color Bars Sync Rate Test
11 SVGA2 800 x 600 37.8 / 60 Color Bars Sync Rate Test
12 XGA

1024 x 768 48.5 / 60 Color Bars Sync Rate Test
13 VESA

1280 x 1024 64.1 / 60 Color Bars Sync Rate Test

14 Fixed Scan Exerciser

Sequences from position 1 through 9 at 4 second intervals, then repeats
15 Multi Scan Exerciser

Sequences from position 1 through 13 at 4 second intervals, then repeats
16 Multi/Power Exerciser

Sequences from 1 through 13 at 16 second intervals, Video/Sync turned


off for 30 seconds, White screen turned on for 30 seconds , then repeats


( Meets the requirements for Energy Star / Nutek compliance testing )
LINEARITY
(8) WHITE SQUARES

Linearity refers to a monitors ability to display shapes such as squares or circles
in various places without any stretching or distortion. Poor linearity causes
onscreen objects to look flattened or squished.

COLOR BALANCE
(9) COLOR BARS

A monitor uses three electron guns (one each for red, green and blue) to excite the
phosphors that make up the pixels in an image. Color balance refers to the
relative strength of the signal from each of the three guns. If the blue gun is turned
up higher than the other two then you will see a bluish tint on the screen. Most
monitors provide color adjustment controls which allow you to adjust the relative
strength of the three electron guns to correct the problem.

SYNC RATE
(9, 10, 11, 12 & 13) VGA, SVGA, XGA & VESA

Computer monitors have sync range limits. To verify the sync range of the monitor,
turn the selector dial to the first color bar position (#9). All VGA monitors will
operate in this mode. Slowly turn the selector dial clockwise. If the pattern extends
beyond the edges of the screen, begins to roll, or becomes scrambled, the sync
limit of the monitor may have been exceeded, or a problem exists in its sync
circuits.

BURN-IN TESTING

(14, 15 & 16) FIXED & MULTI SCAN EXERCISER

Burn-in is the process of cycling through various patterns and frequencies to
exercise the monitors circuits over a period of time. An hour or so should be
sufficient time to determine a monitors readiness for field use. Manufacturers
typically burn-in new monitors for a period of at least 4 hours using position 16.

Operation Manual
VGA-
Plus
Plus

Monitor Tester and Exerciser
Data Sync Engineering

P.O Box 539, Footbridge Lane, Building 3
Blairstown, New Jersey 07825
TEL: (908) 362-6299
FAX: (908) 362-5889
http://www.datasynceng.com VGA-
Plus
Plus

MONITOR TESTER
6 Ground
TO MONITOR
15-Pin H.D. Female
D-Sub
FUNCTION SELECTOR

16 Position Rotary Switch
DC POWER

7-12VDC, 50mA
2.5mm Tip Positive
LED DISPLAY

Indicates DC Power
VGA-
Plus
Plus
CONNECTOR PINOUT
USING THE TESTER
1) Connect the tester to the monitor cable
2) Turn the selector dial to the desired pattern and scan frequency.
3) Turn on the monitor and observe the displayed pattern.

11
7 Ground
12
8 Ground
13 Horiz
9
14 Vert
10 Ground
15
Red 1
Green 2
Blue 3
4
Ground 5
DIAGNOSTIC FUNCTIONS

PURITY

(1, 2, 3 & 5) RED/GREEN/BLUE/WHITE SCREEN

Because monitors use electromagnetism to control their electron guns, magnetic
fields build up within the monitor and cause distortions that appear as colored
patches on the screen. A monitor has good color purity if no such discolorations
are visible. The magnetic fields that cause problems with color purity can
sometimes be eliminated by degaussing.

BLANK RASTER
(4) BLACK SCREEN


A black screen should produce no visible image, however, a background raster
may be seen. If it is very noticeable, then adjust the brightness control until it just
disappears.

HI VOLTAGE REG
(5 & 6) WHITE SCREEN & WHITE BORDER

If the brightness level of an image changes, so does the beam current of the three
electron guns which in turn causes the DC high voltage to vary. If the high voltage
should vary substantially then the picture height and width will change. A properly
regulated high voltage supply should produce no noticeable change between a
white screen and a white border image.

PINCUSHION
(6) WHITE BORDER

On computer screens, lines that should be straight dont always appear that way.
Lines that look bowed or curved are evidence of a pincushion error. Such
problems are common at the right and left edges of a displayed image, resulting
in a screen that appears to be bowed inward at the centers. Better monitors
include controls to help compensate for this error.

CONVERGENCE

(7 & 8) MAGENTA & WHITE SQUARES

The three separate electron guns in a color monitor must be perfectly aligned in
order to generate crisp white lines without colored halos at the edges.
Convergence describes the monitors ability to produce images that lack halos
across all parts of the screen. Poor convergence (or misconvergence) creates the
effect of a poor 3D picture near the corners and edges of the screen, where the
electron beams must bend the most to hit their intended paths.


Symptoms can usually be identified by the displayed pattern. If the pattern appears
normal, then the problem may be in the computer or program, such as a defective
video board or an incorrect video driver. A pattern that rolls up or down on the
display screen signifies a vertical problem. A scrambled pattern that tears
sideways may be a horizontal problem, or the monitor may not be compatible with
the scan frequency. Missing or incorrect colors identify a video problem.