Where is the serial number on the eton satellit 750 ?

Batteries are flat or the AC adapter has failed?

https://www.manualslib.com/manual/1946294/Eton-Elite-750.html#manual

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Here is a link to the manual for your radio.
http://www.etoncorp.com/sites/default/files/GS750_Manual.pdf

It should not be very significant. The gap between two neighboring channels in AM/SW can, on some radios, be set to 9 kHz or 10 kHz depending on countries. For FM the separation is about 100 kHz or 0.1 MHz. Set the right frequency then use the Lock feature. It will prevent any shift/drift of frequency ( and any other changes) until you unlock.

From pages 12-13 of the manual, under the title Listening to what's stored, one can read.
To auto-scan memory press one of the up or down tuning buttons for about 2 seconds and notice the Preset flashes. The radio scans from one memory to another, staying on each memory for about 5 seconds. To stop the scan give the up or down tuning button a quick, short press
The manual is available on the Eton website.

with the radio switched on or off press and hold the zero button on the number pad ON will appear in the display and beep will operate

MSRP is about US $ 300.

join this group... http://groups.yahoo.com/group/Satellit-750/?yguid=336864755 ...info and help from there...joe..

you can download a pdf version of the manual at http://www.nevadaradio.co.uk

unplug the the power plug from side of radio and radio will switch to battery power,i had same LO message on my eton 750 but this stopped it

This is valid for the Satellit 750 by Eton (current owner of Grundig)
When you use it the first time you go through a system code setting to fix the memory page configuration, the AM gap between stations, the type of batteries and FM frequency range.
If it is used in North Ameraica, you are told not to go through procedure but do it any way.
SYSTEM Code setting
Turn Radio off and press a quick short press on the ENTER Button. -- appears on the upper right corner of the display
1. The first code could be 00, 20,25 or 50, meaning the memory is divided into 10, 20, 25, or 50 pages.
2. The second code fixes the AM frequency gap between stations. Enter 09 for 9kHz or 10 for 10 kHz (in North America)
The 3rd code selects the type of batteries used 29 for D size batteries (1.5V each) or 28 for rechargeable batteries (1.2 V each)

The 4th code concerns the FM frequency range: 76 for a range 76-108 MHz (for Japan) or 87 for a range 87-108 MHz

Read your manual to see how the procedure is performed, or try this one valid for the Satellit 750. It might work. Go through all the procedure and press ENTER to confirm system code.