[volt-nuts] HP419A Meter Pegged to Right

[M K]

On 11/11/2014 22:42, Stan Katz wrote:
> That clinches it. Brooke's Tek tour reminded me that I have on file a
> "Service Scope" from Tek entitled "Washing Your Tektronix Equipment". I can
> follow those instructions less the drying for 24 hours in an oven at 125F.
> Doing so will probably have me kicked out of the house by the wife. A hair
> dryer will have to suffice.
>
> The use of a dishwasher, which I could pull off without being found out by
> my spouse, does require removing all the pots. Anyway, I think that
> dishwashing is most appropriate for boards with all surface mount chips.
> Forty year old electrolytics (all of which surprisingly have tested good)
> might balk at being machine washed.
>
> Stan
>
> On Tue, Nov 11, 2014 at 11:34 AM, Brooke Clarke <brooke at pacific.net> wrote:
>
>> Hi:
>>
>> My second oscilloscope was a new Tek 515 which I got for the student price
>> and picked up from the Tek sales office on San Antonio Rd in Palo Alto.  On
>> the tour they showed me the washing booth where they used a water soap
>> solution to spray wash the complete scope.  There were no parts in the
>> design that would absorb water.
>>
>> When washing semiconductor wafers after the DI water rinse they used an
>> alcohol rinse then a compressed clean air blow off.  The alcohol sucks up
>> the water and what small amount that's left after the air evaporates
>> quickly.
>>
>> Mail_Attachment --
>> Have Fun,
>>
>> Brooke Clarke
>> http://www.PRC68.com
>> http://www.end2partygovernment.com/2012Issues.html
>> http://www.prc68.com/I/DietNutrition.html
>>
>> David C. Partridge wrote:
>>
>>> And should you be prepared to remove the pots, you could run it through
>>> the dishwasher ... (if it works for Bob Pease, it works for me too).
>>>
>>> Regards,
>>> David Partridge
>>> -----Original Message-----
>>> From: volt-nuts [mailto:volt-nuts-bounces at febo.com] On Behalf Of ed breya
>>> Sent: 11 November 2014 07:44
>>> To: Discussion of precise voltage measurement
>>> Subject: Re: [volt-nuts] HP419A Meter Pegged to Right
>>>
>>> If you're talking about washing the board only, I'd say go for it.
>>> :
>>> :
>>>
>>> Ed
>>>
>>> At 07:28 PM 11/10/2014, you wrote:
>>>
>>>> I'm trying to bring an HP419A back to life.
>>>> :
>>>> :
>>>>
>>>> Any votes for a water wash? Any better ideas?
>>>>
>>>>   _______________________________________________
>>>
A quick wash down with pure isopropyl alcohol afer the wash will help 
draw out a lot of the residual water. Some sources of IPA seem to have a 
significant meths content as in the past a bad batch crazed some 
polystyrene capacitors, so check before use on a whole board.