hi Mike, from your s/no M243650 I get the code as 0536 when it says "wait 30" do just that, leave the radio on and do not touch any buttons it will count down the 30 minutes then you should be able to input the code if your not certain as to the correct inputting procedure have a look at www.davidsonelectronics.co.uk/code_entry.htm it has a demo of the procedure
nigel
May 2008