Marantz AV8805A Owner's Manual page 273

Contents Connections Playback Settings Tips Appendix
Operating learning function
If the unit does not operate even when the preset code is registered, use
the learning function. Remote codes for different devices can be
remembered for use by the Marantz remote control included with this unit.
POWER X
SET
Input source
select buttons
273
Front panel Display Rear panel Remote Index