HI Stan and Shapna--

IF the hV does come back after resetting it--maybe in a different gas 
configuration, you may just have tuned it to an unstable box/trap 
setting. Changing the tuning parameters and/or cleaning the source can 
help.  However, if it won't come back up, or come on then trip off, you 
may have a more serious issue--which you may have.  We had the bus 
controller go on our 253, so it wasn't sending the right set signal to 
the hV.  It could also be other communication related issues.  We 
swapped PC's with another mass spec to rule that out in our case, but a 
corrupted Isodat or bad PC board may cause problems.  The Thermo reps 
can talk you through the test point values

take care

gerry

Shapna Mazumder wrote:
> I recall having to click on the Reset HV icon (top left Instrument 
> Window)  to restore HV on my Delta V. 
> Shapna
>  
>  
>  
> Water and Aquatic Sciences Research Program
> University of Victoria, Department of Biology
> PO Box 3020, Station CSC,
> Victoria, BC, Canada V8W 3N5
> (250) 472-4789
>
>     ----- Original Message -----
>     *From:* Stan Klonowski <mailto:[log in to unmask]>
>     *To:* [log in to unmask] <mailto:[log in to unmask]>
>     *Sent:* Thursday, January 10, 2008 1:34 PM
>     *Subject:* [ISOGEOCHEM] Delta hv problem
>
>     A little more information on the problem mentioned yesterday.
>
>     After measuring all the valuable operating parameters everything
>     seems within what should be within operating range except the Y
>     focus which is 125 V @100 for both Y1 an Y2. For what it is worth
>     All the green lights that say everything is OK are on inside the
>     machine.
>
>     Thanks for any assistance.
>     Stan
>