[time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k

Orin Eman orin.eman at gmail.com
Sat Jul 6 12:11:50 EDT 2013


What's the specified tolerance on the 17,000 uF?  You probably have quite a
range to work within.  If you are lucky, they specified something like
+80/-20% and the 29,000 uF might be OK (measure it).


On Sat, Jul 6, 2013 at 4:18 AM, Mark C. Stephens <marks at non-stop.com.au>wrote:

> C3 (17000uf @ 10v) is open circuit.
> Where am I going to get one of those from.
>
> I need some advice here, Should I just use modern low ESR solder lug type
> soldered directly onto the board?
> Or Should I try and locate a screw terminal type Capacitor?
>
> Obviously, I want to do the best for this timer as I rely on it
> tremendously.
>
>
> -marki
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Mark C. Stephens
> Sent: Saturday, 6 July 2013 8:47 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting
> normally, PB LEDS scannning and appears to be reading o/k
>
> Checked the PSU voltages on the PSU card next to the 10811.
> The -5.2 is reading -4.2.
> Took a look with the scope and instead of a nice flat DC I see a 4V Peak
> to Peak spike @ 100Hz.
> Trying to track down a service manual.
> Any ideas on this one guys, if the Pass tranny was shorted, it would be a
> lot more than 4.2V unless the overvoltage Zener is able to sink all that
> current...
>
>
> -marki
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Mark C. Stephens
> Sent: Saturday, 6 July 2013 8:18 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting
> normally, PB LEDS scannning and appears to be reading o/k
>
> I went to use my 5370B todayt and noticed the LEDS on the display are
> slowly sort of pulsing bright one after another.
> Also all the push button LEDS are going on and off one by one.
> The strangest thing is that it appears to be working o/k via HPIB.
>
> I don't have extender boards but I do have a signature analyser.
>
> Could it be something silly like one of the PSU regulator has gone kaput?
> Has anyone seen this issue before?
>
>
> -marki
>
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