Samsung SCX-5639FR-XAA - Manual (Page 155)

Regulatory information
155 5. Appendix
Every country has different restrictions on the use of wireless
devices. Since your system is equipped with a wireless device,
when traveling between countries with your system, check
with the local Radio Approval authorities prior to any move or
trip for any restrictions on the use of a wireless device in the
destination country.
If your system came equipped with an internal embedded
wireless device, do not operate the wireless device unless all
covers and shields are in place and the system is fully
assembled.
Wireless devices are not user serviceable. Do not modify them
in any way. Modification to a wireless device will void the
authorization to use it. Contact manufacturer for service.
Only use drivers approved for the country in which the device
will be used. See the manufacturer System Restoration Kit, or
contact manufacturer Technical Support for additional
information.