[time-nuts] HP-5335A Fail Code

[Gordon Batey]

Thanks for your interest Magnus.  I am entering the diagnostic 
start codes as you mentioned at the bottom of your email but all 
I get are a series of seemingly random numbers.  

I do have a second similar counter to refer to, so that helps.  

The manual seems to indicate that the problem may be in the 
MRC or A4U7.  Not I need to see how to see which one.

Thanks again,

73 Gordon WA4FJC

==========================================



Date: Sun, 27 Mar 2011 13:57:16 +0200
From: Magnus Danielson <magnus at rubidium.dyndns.org>
To: time-nuts at febo.com
Subject: Re: [time-nuts] HP-5335A Fail Code
Message-ID: <4D8F261C.7090503 at rubidium.dyndns.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Gordon,

On 03/15/2011 12:52 AM, Gordon Batey wrote:
> Greetings to the Time Nuts List
>
> I have a HP-5335A counter that has worked well for me for several years.
> Now when turning it on I get a Fail 4.6 readout on the display.
>
> The manual indicates that a 4.6 fail code indicates
>
> "MRD Counter problem in Reg-E or T"
>
> I found in the manual that you should run diagnostic 9 and 10 for this
> condition.
>
> Test 9 returns many changing 4 decimal place numbers 10.abcd , 12.defg ,
> 14.xqrg  etc.
>
> Test 10 returns many changing one decimal place numbers ie 15.9 , 16.1 ,
> 16.4 , 15.8  etc
>
> Any thoughts or recommendations on pining down the cause and solution for
> this
> condition would be appreciated.

I have been looking at this email since it hit my inbox. I can't quite 
match the readings you have made with what the Diagnostic 9 (8-284) and 
10 (8-286) does, it rather matches the manual tests 9 (4.70) and 10 (4.74).

I just ran Diag 9 and Diag 10 on my 5335A and they didn't say anything 
else than "PASS".

Unless you found it you need to hit:

To enter diag mode
SCALE SMOOTH 9 9 ENTER

To do diag 9
SCALE 9 ENTER

and to do diag 10
SCALE 1 0 ENTER

Cheers,
Magnus