Mercedes-Benz 190E 2.3 1987 Owner's Manual page 54

To adjust the tone characteristic
Base and treble can be adjusted independently.
To set the radio to a "flat" tone setting (bass and treble at mid-range setting),
briefly press both tone controls Q
Upon pressing either tone button, the tone level for that function (either bass | Q
or treble H ) will begin increasing. It stops increasing when the button is
released or when the maximum tone level is reached (approx. 2.5 seconds).
After reaching the maximum tone level, the tone control will stay at that level
unless the tone button is released and pressed again, at which point the tone
level will start decreasing. It will stop decreasing when the button is released or
when the minimum tone level is reached (approx. 5 seconds).
After reaching the minimum tone level, the tone control will stay at that level
unless the tone button is released and pressed again. After pressing the tone
button again the tone level will begin to increase and the cycle is repeated.
Adjustments made to the tone characteristics can be observed on the tone set­
ting indicator in the display.
Note: It takes approx. 5 seconds to go from minimum tone level to maximum
tone level.
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simultaneously.
To select AM or FM
Press any of the buttons marked | | j j
through Q d to tune the radio
to the FMoand.
Press any of the buttons marked B d
through B O t0 tune the radio
to the AM band.
The selected wave band is shown in
the digital display.
To tune in a station
Stations can be tuned in by using
automatic seek, direct frequency tun­
ing, manual tuning, or by preset push­
buttons. The frequency of the station
selected is indicated on the digital
display.
Automatic station seeker
Switch to the wave band desired by
pressing any of the following buttons:
for FM, buttons Q d through Q d
for AM, buttons through [JJ|.
By pressing the automatic station
seeker bar Q B J Q g upward the
radio will seek stations in ascending
frequencies, by pressing down it will
do so in descending frequencies. The
direction of automatic seeking can be
reversed by pressing the bar
in the respective direction. In order to
arrive at a desired station without
stopping, the bar must be held in the
desired direction.