Marantz AV8805 Owner's Manual page 263

Av pre amplifier

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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 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. (v p. 268)

0 Depending on the model and year of manufacture of your device, some buttons

may not operate.