Dell S520 User Manual page 115

Reset the lamp usage time by selecting "Yes" for Lamp Reset in the OSD
9
Power Settings of the Advanced Settings menu (see Power Settings of
the Advanced Setting menu on page 50). When a new lamp module has
been changed, the projector will automatically detect and reset the lamp
hours.
CAUTION:
LAMP(S) INSIDE THIS PRODUCT CONTAIN MERCURY AND MUST
BE RECYCLED OR DISPOSED OF ACCORDING TO LOCAL, STATE,
OR FEDERAL LAWS. FOR MORE INFORMATION, GO TO
WWW.DELL.COM/HG OR CONTACT THE ELECTRONIC INDUSTRIES
ALLIANCE AT WWW.EIAE.ORG. FOR LAMP-SPECIFIC DISPOSAL
INFORMATION, CHECK WWW.LAMPRECYCLE.ORG.
Lamp Disposal (for the US only)
Troubleshooting Your Projector 115