Oh, one other thing. I have seen this problem caused by a bad coax connection to one of the modules. They are compression fittings to the outer conductor and if over tightened, damage will occur.
Tom
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----- Original Message -----
From: Jose V. Gavila
To: hp_agilent_equipment@...
Sent: Tuesday, January 01, 2013 4:59 PM
Subject: Re: [hp_agilent_equipment] HP-8657A question
Hello Joe,
> I suspect it could be either. My 8657A is silent but my 8657B 'clicks'
> every 5 dB and has a mechanical attenuator.
>
> Do you have a picture of the attenuator?
I have uploaded one to:
Thanks!
JOSE
> -----Original Message-----
> From: hp_agilent_equipment@...
> [mailto:hp_agilent_equipment@...] On Behalf Of Jose V. Gavila
> Sent: Tuesday, January 01, 2013 1:41 PM
> To: HP-Agilent Equipment
> Subject: [hp_agilent_equipment] HP-8657A question
>
> Hi all,
>
> I wish you have a nice 2013!
>
> Well, I am working on an 8657A which has no output. So far, following
> Service Manual (SM) troubleshooting guidance, I have found that there is
> signal output from the A6 assembly. So it goes to the attenuator
> assembly and vanishes.
>
> I have a simple question: do the attenuaotrs on this unit generate any
> mechanical noise or are they some kind of electronic switches?
>
> I am following the tests on the SM (SS7) and there is so far a
> difference on a control signal, but it would mean just a wrong
> attenuation setting, but not a fully missing signal.
>
> Any hint will be welcomed!. It is my very first 8657A :-)
>
> Regards,
>
> JOSE
>
--
73 EB5AGV - JOSE V. GAVILA - IM99sm La Canyada - Valencia(SPAIN)
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