NEC 4020, 4620 user manual Troubleshooting

Models: 4020 4620

1 41
Download 41 pages 39.07 Kb
Page 37
Image 37

Troubleshooting

English

No picture

¥The signal cable should be completely connected to the display card/computer.

¥The display card should be completely seated in its slot.

¥Front Power Switch and computer power switch should be in the ON position.

¥Check to make sure that a supported mode has been selected on the display card or system being used. (Please consult display card or system manual to change graphics mode.)

¥Check the monitor and your display card with respect to compatibility and recommended settings.

¥Check the signal cable connector for bent or pushed-in pins.

Power Button does not respond

¥Unplug the power cord of the monitor from the AC outlet to turn off and reset the monitor.

Image persistence

¥Please be aware that LCD Technology may experience a phenomenon known as Image Persistence. Image Persistence occurs when a residual or ÒghostÓ image of a previous image remains visible on the screen. Unlike CRT monitors, LCD monitorsÕ image persistence is not permanent, but constant images being displayed for a long period of time should be avoided. To alleviate image persistence, turn off the monitor for as long as the previous image was displayed. For example, if an image was on the monitor for one hour and a residual image remains, the monitor should be turned off for one hour to erase the image.

NOTE: As with all personal display devices, NEC DISPLAY SOLUTIONS recommends displaying moving images and using a moving screen saver at regular intervals whenever the screen is idle or turning off the monitor when not in use.

Image is unstable, unfocused or swimming is apparent

¥Signal cable should be completely attached to the computer.

¥Use the OSD Image Adjust controls to focus and adjust display by increasing or decreasing the fine adjustment. When the display mode is changed, the OSD Image Adjust settings may need to be re-adjusted.

¥Check the monitor and your display card with respect to compatibility and recommended signal timings.

¥If your text is garbled, change the video mode to non- interlace and use 60Hz refresh rate.

Image of component signal is greenish

¥Check to see if the DVD/HD input connector is selected.

LED on monitor is not lit

(no green or red colour can be seen)

¥Power Switch should be in the ON position and power cord should be connected.

¥Make certain the computer is not in a power-saving mode (touch the keyboard or mouse).

RED LED on monitor is blinking

¥A certain failure might have occurred, please contact your nearest authorized NEC DISPLAY SOLUTIONS service facility.

Display image is not sized properly

¥Use the OSD Image Adjust controls to increase or decrease the coarse adjustment.

¥Check to make sure that a supported mode has been selected on the display card or system being used. (Please consult display card or system manual to change graphics mode.)

Selected resolution is not displayed properly

¥Use OSD Display Mode to enter Information menu and confirm that the appropriate resolution has been selected. If not, select corresponding option.

No Sound

¥Check to see if speaker cable is properly connected.

¥Check to see if mute is activated.

¥Check to see if volume is set at minimum.

Remote Control is not available

¥Check the Remote ControlÕs batteries status.

¥Check if batteries are inserted correctly.

¥Check if the Remote Control is pointing at the monitorÕs remote sensor.

¥Check the Remote Control Mode status.

¥The remote control system may not function when direct sunlight or strong illumination strikes the remote control sensor of the LCD monitor, or when there is an object in the path.

“SCHEDULE”/“OFF TIMER” function is not working properly

¥The ÒSCHEDULEÓ function will be disabled when the ÒOFF TIMERÓ is set.

¥If the ÒOFF TIMERÓ function is enable and the power to the LCD monitor is turned off if the power supply is interrupted unexpectedly, then the ÒOFF TIMERÓ will be reset.

RS-232C is not working

¥Make sure the monitor is not in ÒEco StandbyÓ mode (see page 27).

Snowy Picture, Poor Sound in TV

¥Check antenna/cable connection. Use new cable if necessary.

Interference in TV

¥Check components for shielding, move away from monitor if necessary.

Either light vertical or horizontal stripes may appear, depending on the specific display pattern. This is no product fault or degradation.

English-35

Downloaded From TV-Manual.com Manuals

Page 37
Image 37
NEC 4020, 4620 user manual Troubleshooting

4020, 4620 specifications

The NEC 4620 and NEC 4020 are significant models in the realm of telecommunications, particularly noted for their sophistication and capabilities in network management and communication systems. These systems have been crucial in advancing telecommunications infrastructure for businesses and organizations, delivering efficient solutions to manage calling patterns and other communication functions.

The NEC 4620 is renowned for its robust performance and versatility. Designed for small to medium-sized enterprises, this model integrates voice and data communication seamlessly. One of its main features is the support for both legacy telephone systems and modern VoIP technology, allowing businesses to transition gradually while ensuring no disruption in service. It also supports a wide range of telephony applications, enhancing its functionality and usability across various business environments.

A standout characteristic of the NEC 4620 is its scalability. It can be easily expanded to accommodate the growing needs of an organization, providing investment protection as businesses evolve. The system also boasts advanced call handling features, including call forwarding, voicemail, and conferencing capabilities, ensuring efficient communication within and outside the organization.

On the other hand, the NEC 4020 targets larger enterprises with more demanding communication needs. It offers higher capacity and more extensive integration options. This model is built with advanced technologies that support unified communications, allowing seamless collaboration among team members. One of its key technological advancements is its ability to integrate with various third-party applications, providing organizations with customized solutions that cater to their unique workflow and operational requirements.

Both the NEC 4620 and 4020 embrace the concept of unified communications, ensuring that voice, video, and data are effectively converged. This capability not only enhances productivity but also promotes better customer service through improved response times and communication transparency. Additionally, these systems are equipped with robust security features, ensuring that sensitive communication data remains protected from unauthorized access.

With their state-of-the-art technologies and features, the NEC 4620 and 4020 represent a significant investment in the future of organizational communication. As businesses increasingly rely on advanced telecommunications systems to drive growth and efficiency, these models stand out as premier solutions that empower organizations to navigate the complexities of modern communication effectively.