Marantz Stereo 70S 2.1-Channel Network A/V Receiver - Manual (Page 111)

Panel lock function
To prevent accidental operation of this unit, you can disable operation of
the buttons on the front panel.
X
INPUT selector knob
Disabling all knob operations
1
When this unit is turned on, press and hold X on the
main unit until “SPECIAL MODE” appears on the
display.
2
Turn the INPUT selector knob to select “4P/R LOCK”,
then press X .
3
Turn the INPUT selector knob to select “P/V LOCK ON”,
then press X to confirm the setting.
All knob operations except X are disabled.
Contents Connections Playback Settings Tips Appendix
111
Front panel Display Rear panel Remote Index