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How do I stop my Grundig SC 303 radio switching off with the ignition?

How do I stop my Grundig SC 303 RDS car radio switching off when I switch off the car's ignition. I know it is possible to prevent this but unfortunately I have lost the manual.
D Simpson, February 2005
on/off logic [ignition operated]when the vehicle ignition is switched off,the radio if on,will also be switched off.when the ignition is switched on again the radio will also be switched on again. the on/off logic via the ignition can be disabled so that the unit can only be switched on/off by the button.[logic off] to switch off the logic,switch on the ignition,press and hold the the station presets1 and 3 and switch the set on.keep the presets pressed until a bleep is heard.[logic on]to switch the logic back on repeat the procedure for logic off.[note]if the unit is disconnected from the power supply, when reconnected it will have the logic on. regards jim

jim, September 2006
link Click here to see other fixes for Grundig SC 303.