Marantz HD-DAC1 Service Manual page 18

(4) When replacing the front panel, you may the ring of POWER button does not fit.
In such a case, do the following.
Piled the inner mold and front panel.
View from the inside of the front panel + inner mold
Please press a little screwdriver hook arrow portion after you have caught before the hook of the 2 other places.
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