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

[Mark C. Stephens]

Hopefully HP Voltage "Derated" the Cap as well  so it can handle our 250V here..
We are across the road from the main transformer for the area so the voltage is highest at our place, I checked the meter box this morning - it is 255-258V on all 3 phases, no wonder I am having problems.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Orin Eman
Sent: Sunday, 7 July 2013 2:12 AM
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

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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