Mark and Paul,
I have had power supply problems with these as well as previous HP defibs. According to a Philips UK person, in the USA they design the power supplies for the US 110volts, then modify them by doubling or halving values of components as necessary for 230volts in Europe.
But this does not always work as we have found out.
This started with the 43120A over 10 years ago and still they have not learned their lesson.
We too had all our power supplies replaced after having purchased about half of them individually. But were being told as we purchased them that we were the only ones with the problem. HA HA.
Paul, hassle your rep and look at the MHRA web site for the document Mark mentioned and show that to them. You might get somewhere.
PS Paul Your manual bounced back as it was too big for your inbox. Is there another email you can access that will take large attachments?
If it came to it I could put it on CD for you but it might be easier to gain access to Philips Biomed online.