I was going to clean up an old D100 and give it to a teenager. Last night I noted that I must have an external power source attached before I can clean the sensor. That sounds crazy! Usually all one needs is a well charged battery. The external power supply was extra and never shipped with the D100. I never had to do this with my other cameras: D70s, D200, D300 & now D800. Is there a workaround? I have looked and I see no firmware upgrade.