Tim, You need to make sure the ion pump current has dropped to <10 on the meter or else the +18V supply is disabled. If it is high watch the 18 volt meter position and momentarily remove the A7 high voltage by pulling out the HV connector. If the +18 comes up then reconnect the HV and let the unit run a couple days. Hopefully you should see the ion pump current slowly drop, when it falls below the trip point the CS oven and +18V will come on and the ion pump reading will rise again, possibly pegging. This is normal for a unit that has been off for a long while. It can take a couple days of cycling to finally drop and stay below the trip point. If the +18 is indeed dead then you can hook an external +18V @ 1.5A between chassis ground and one of the marked +18V runs. Current draw is about 1.3A. This is just for momentary testing as the ion pump interlock will be bypassed. If you are patient you can apply the +18V, watch the ion pump peg, remove the +18V, wait till the ion pump drops below 10, and repeat until you can leave the +18V connected and the ion pump is 10 or below. I have done this while working on these units and also have replaced the +18V card with a DC to DC module that has remote gate capability so that the ion pump circuit will work with it. Hope this helps, Corby Dawson ____________________________________________________________ Need cash? Click to get a loan. http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3mKiwGS8ET4aZc2MsHNNSQ9Rn560rX0SyLVQaeqyaBx7UTCp/