Dear Deborah,
I take it as read you have checked and double-checked the source before and
after re-installation for shorts and the only continuity you see is across
connectors 2 and 3 (at 6 and 5 o'clock as you look at the source once put
back into the analyzer)?
Have a look at the source board (the large board sitting upright to the
right of the turbo controller/s; you have to take the right side cover off)
and check how many LEDs are on. There are 4 in total and 3 should be on; on
near the top edge of the board (red) and two near the bottom edge towards
the right corner (green and red).
I suspect from what you're describing, the green/red pair are on and the top
red one is off.
Select your standby source tune file (HV zero, Trap zero, the rest is not
that important) and switch the source (electronics) off. All LEDs should be
off now (ignore the flicker while switching off; Lenz's Rule and all that).
Take the source connector off (the Teflon block on the source flange).
Switch the source (electronics) back on and load e.g. your CO2 tune file.
Check the LEDs now.
My guess is, the greed/red pair is on but the red is still off. If that's
the case, call SerCon Man to the rescue. Either a part on the source board
has pegged it or a part on the power supply unit for the source board is
dead.
Sorry I can't be offer more help.
Wolfram
> -----Original Message-----
> From: Stable Isotope Geochemistry
> [mailto:[log in to unmask]] On Behalf Of Deborah Rupprecht
> Sent: 01 June 2006 06:43
> To: [log in to unmask]
> Subject: trap or board problems at ANCA SL/20-20
>
> Hello to all of You,
>
> my problem is a hanging trap at 138µA (set to Zero or 200
> does not matter), Ion repeller shows 78 (set to 12), beam
> focus shows 1.5 0r 0.8 (set to 0), emission is about 150
> (standby.src, 1000 V HT)). I have changed the filament
> because I supposed it was broken, but it did not look like. I
> could not "warm up" the filament in 10µA-steps as ususal,
> because it was jumping to 138µA immediatelly after opening the source.
> I even have pressed the red switch on the board aside the
> 20-20 several times, but nothing changed (just for a moment,
> everything was showing Zero, but then the trap was jumping
> back to 138). ANCA.exe was shut down and reloaded, nothing changes.
>
> What's wrong? I guess I know the problem but I cannot find in
> my notes.
>
> Hope for a hint from somebody out there and many thanks in
> advance, Deborah
>
>
>
> ******************************************
> Rhein. Friedrich-Wilhelms-Universität Bonn Institut für
> Nutzpflanzenwissenschaften und Ressourcenschutz (INRES)
> Lehr- und Forschungsbereich Pflanzenernährung
> Karlrobert-Kreiten-Str. 13
> 53115 Bonn, Germany
> Phone (+049) 0228-73-1631, -3640, -1632
> ******************************************
>
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