Envision Peripherals H712a user manual Technical Support FAQ

Models: H712a

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TECHNICAL SUPPORT (FAQ)

Problem & Question

 

Possible Solution

 

 

 

 

Power LED is not on

 

*Check if the Power Switch is in

the ON

 

 

 

 

 

position

 

 

 

 

 

 

 

 

 

 

*Power Cord should be connected

 

 

No Plug & Play

 

 

*Check if the PC system is Plug

& Play

 

 

 

 

 

compatible

 

 

 

 

 

 

 

 

 

 

*Check if the Video Card is Plug

& Play

 

 

 

 

 

compatible

 

 

 

 

 

 

 

 

 

 

*Check if the D-15 plug pin of Video

 

 

 

 

 

Cable is bent

 

 

 

 

Picture is fuzzy

 

 

*Adjust the Contrast and Brightness

 

 

 

 

 

Controls.

 

 

 

 

 

Picture

bounces

or a

 

wave*Move electrical devices that may cause

pattern is present in the

pictureelectrical interference.

 

 

 

The power LED is ON

but*Computer Power Switch should be in

there￿s no video or no pictureth.ON position.

 

 

 

 

 

 

 

 

 

*Computer Video Card should be snugly

 

 

 

 

 

seated in its slot.

 

 

 

 

 

 

 

 

 

*Make sure monitor￿s video cable is

 

 

 

 

 

properly connected to the computer.

 

 

 

 

 

*Inspect monitor￿s video cable and make

 

 

 

 

 

sure none of the pins are bent.

 

 

 

 

 

 

*Make sure computer is operational by

 

 

 

 

 

hitting the CAPS LOCK key on the

 

 

 

 

 

keyboard while observing the CAPS

 

 

 

 

 

LOCK LED.

The LED

should either

 

 

 

 

 

turn ON or OFF after hitting the CAPS

 

 

 

 

 

LOCK key.

 

 

 

 

 

Missing one of the primary*Inspect the

monitor￿s video cable and

colors

(RED,

GREEN,

ormake sure that none of the pi

 

BLUE)

 

 

 

 

bent.

 

 

 

 

 

 

Screen image is not centered*Adjustor

pixel

frequency

(CLOCK)

and

sized properly.

 

 

FOCUS or press hot-key (AUTO).

 

 

Picture has color defects

 

*Adjust

RGB

color

or

select

color

(white does not look white) temperature.

 

 

 

 

 

Horizontal

or

vertical*Use win

95/98 shut-down

mode Adjust

disturbances on the screen CLOCK and FOCUS or perform hot- key

 

 

 

 

 

(AUTO-key).

 

 

 

 

 

CLOCK (pixel frequency) controls the number of pixels scanned by one

horizontal sweep. If the frequency is not correct, the screen shows verti

stripes and the picture has not correct width.

FOCUS adjusts the phase of the pixel clock signal. With a wrong phase

adjustment the picture has horizontal disturbances in light picture.

For FOCUS and CLOCK adjustment use ￿dot-pattern￿or win 95/98 shut-

down mode pattern.

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Envision Peripherals H712a user manual Technical Support FAQ