Fujitsu ECLIPSE CD8455 Owner's Manual page 202

How to operate the tuner with an optional HD Radio tuner connected (U.S.A. only)
[FUNC] button [SEL] button
[DISP] button [RTN] button
Turn the [SEL] button to select AUTO or OFF.
The selected item will be highlighted.
In the [AUTO] setting, the selection is switched between digital and
analog reception automatically. In areas where digital reception is
not possible, reception is automatically switched to analog to avoid
loss of reception. During digital reception, [DIGITAL] is shown on
the display. This is cleared during analog reception.
In the [OFF] setting, reception is always analog.
Press the [SEL] button.
Press the [RTN] button.
At this time, other adjustments can also be made in function mode.
Press the [FUNC] or [RTN] button to exit function mode.
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