[volt-nuts] Solartron 7071 beeping about twice a second (J.L.Trantham)

[David C. Partridge]

Ho-hum, it wasn't the capacitors :( 

Dave
-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On Behalf Of David C. Partridge
Sent: 30 January 2013 10:36
To: 'Discussion of precise voltage measurement'
Subject: Re: [volt-nuts] Solartron 7071 beeping about twice a second (J.L.Trantham)

Bill,

I'm looking at power supply problems right now ... the three 47uF capacitors (C56 - C58) in the 40V supply were all very ill (two had huge series resistance and measured as about 20uF, and the other one was a 10M resistor).  It is remarkable that the 40V supply was even partially functional.  Massive ripple on that supply for at least 10 seconds after power on. 

I'm currently waiting for the post to deliver the replacement caps.

Regards,
David Partridge
-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On Behalf Of Bill Ezell
Sent: 29 January 2013 21:51
To: volt-nuts at febo.com
Subject: Re: [volt-nuts] Solartron 7071 beeping about twice a second (J. L.Trantham)

On 01/28/2013 12:00 PM,  "David C. Partridge" 
<david.partridge at perdrix.co.uk> wrote:

 >I've got a problem with a 7071 which is beeping at me about twice a second, and also flashes the COMPUTE and DIG FILT LEDs on the front  >panel at the same rate.

I can't find anything in any versions of my service or operating manuals that correspond to that failure. I suspect you have a significant failure in the earthy-side processor board. You replaced your ROMs at one point, didn't you? I'd try swapping in a new set just to be sure one didn't die. Otherwise, you've probably got some difficult diagnosing to do. Can you get anything over the RS-232 link?

--
Bill Ezell
----
They said 'Windows or better'
so I used Linux.

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