Marantz AV7703 Owner's Manual page 260

Contents Connections
0 Some manufacturers use more than one type of remote control code. Preset
codes to change the number and verify correct operation.
0 If the device 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 device. (v p. 265)
NOTE
0 Depending on the model and year of manufacture of your device, some buttons
may not operate.
Front panel Display
Playback Settings
260
Rear panel
Tips
Remote Index
Appendix