Filament cold resistance : with ( multimeter, the same below ) R × 1k block measurements, normal less than 1Q ( typically tens of mΩ resistance filament and shell ask measured by R × 10k block , normal is infinite filament resistance is caused by the large magnetic one of the common causes of low output power control if the measured filament resistance is large, do not easily determine the magnetron is bad or aging. practice shows that this situation is mostly magnetron filament pin or socket oxidation product after the formation of the contact resistance scale is also due to measurement errors, usually with a multimeter measurement point pen or pen socket contact resistance due to ask , but the question itself magnetron rare , usually only life has expired long-term work overload or a few quality defects exist magnetron failure may occur before this , so the detection , the first multimeter should be normal, and the measurement method to be correct , followed by sanding or scraping should magnetron pin light , remove dirt and oxide before measuring , if the measured resistance is large , we can determine the bad magnetron.nStservice manual download site

Open filament mostly magnetron itself is damaged , which generally had to get a new tube , but a few of the magnetron filament is open due to sealing off the lead . When repairs can pry open the filament base , followed by sub- pliers clamp the lead and the connecting piece , and then iron weld it.nStservice manual download site

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