Hi Gareth,
unfortunately, the past-Inova schematics (besides that rather basic "Hardware
Training Course" which is openly available) are only available "in there", not
"out there". I know of noone "out there" having access to any schematics. But
then again Bruker does the same since quite a few years now - or does anyone
have e.g. AV3 schematics? SGU1/2/3 anyone? HPPR2?
Hopefully a kind soul chooses to change that status whenever Agilent decides
to drop the NMR ball completely in the end - whenever that may be…
Until that time we have to get by figuring out what's going on. Fixing VFS,
synthesizer boards and RefGen boards/modules a spectrum analyzer can be very
handy (check each amplification stage).
Cheers
Bert
> Am 04.03.2025 um 16:06 schrieb Gareth Morris via groups.io:
>
> It’s a long shot, but we have managed to keep our flaky two-channel
> VFS alive for quite a few years by boosting the level of the output of the
> comb generator (we used a TI TRF37D73 broadband amplifier module module).
>
> It’s frustrating to know that schematics must be out there somewhere!
>
>
> Best wishes
>
> Gareth
>
> From: main_at_ammrl.groups.io on behalf of Lin, Penghui via groups.io
> Date: Tuesday, 4 March 2025 at 14:43
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] #agilent #Hardware #VarianAgilent
>
> Thank you all for the replies,
>0
> I forgot to mention that this is a 4-channel VFS module and both channel 3
> and 4 are also bad. Only channel 2 still works for now. So it seems the other
> three channels share some kind of control or gating system?
>0
> I probably shouldn't use the term "easy fix". What I meant is if there is
> any way we can diagnose the component inside the module to find out which
> one(s) goes wrong and possibly replace it in-house.
>
> Since John mentioned that there is no schematics, guess it is almost impossible.....
>
> Penghui
>
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