[time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB ...

GandalfG8 at aol.com GandalfG8 at aol.com
Sat Jul 6 11:36:48 UTC 2013


As per my reply to the same question on the HP group, you've  identified 
the problem so just go for a reasonably close-ish equivalent and  replace it!
 
Regards
 
Nigel
GM8PZR
 
 
In a message dated 06/07/2013 12:18:44 GMT Daylight Time,  
marks at non-stop.com.au writes:

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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