Yealink EXP20 User Manual

Troubleshooting
47
This chapter provides general troubleshooting information to help you solve the
problems you might encounter when using your EXP20.
If you require additional information or assistance with your EXP20, contact your system
administrator.
Why is the EXP20 LCD screen blank?
 Ensure that the Ext in/out jacks on the EXP20 LCD expansion module are properly
plugged using the supplied connecting cord. For more information, refer to
Installation on page 4.
 Ensure that the contrast of the LCD screen is in a comfortable level. For more
information, refer to Adjusting the Contrast on page 42.

Yealink EXP20 Specifications

General

Handset type	-
Product type	IP Phone
Product color	Black
Backlight display	Yes
Display resolution	160 x 320 pixels
Lines quantity	- lines
Phonebook capacity	- entries
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Number of handles included	- pc(s)
Certification	CE, RoHS
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	110 mm
Width	112 mm
Height	143 mm