Dear microanalysts,
our Jxa-8600 electron microprobe automatically switched off its electronic
due to a failure in a cooling of objective lens. We checked oil in the
apposite reservoir and we refilled it since its level was about 4-5 cm from
the top. We re-started the probe, the failure error disappeared, the
electronic switched on but proceeding as usual to saturate the filament  we
realized that current is extremely variable and high (up to 450 nA on Farday
cup), we have no images on CRT video and we can not observe beam in the
optical video. We inspected the instrument and not apparent oil leakage can
be observed in both electron column ans sample chamber. 
Any suggestions?
Thanks in advance.

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