[ARC5] MFP- Before or After

[J. Forster]

Mike,

Do you have a specifc manual number or link for such a manual?

It is very clear that was not done with this Output Meter. The resistor
cooked the varnish w/in <1 minute.

-John

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



> John wrote:
>
>> The crux of the question is I would expect an item to be tested after
>> being sprayed with gunk.
>>
>> That is apparently not the case.
>
> Most of the manuals for various Signal Corps radio equipment contain
> a rather detailed set of instructions for performing the initial MFP
> process.  These instructions specify what has to be opened, what has
> to be removed, what has to be taped over to prevent varnish application
> (usually with very specific lists of where the tape must be applied
> throughout the set).  Following all that preparation, the device is
> heated to below 160 F for several hours (three hours typical) in order
> to drive out moisture before the MFP varnish is applied.  Immediately
> after the drying process, three coats of MFP varnish are applied at
> 15 to 20 minute intervals between application.
>
> When all that is done, the instructions continue:
>
> (1)  Remove all masking tape...
> (2)  Reassemble the set and test its operation.
>
> Last instruction:  "Mark the letters MFP and the date of treatment above
> the nameplate.  EXAMPLE:  MFP-8 Dec 44."
>
> So there is instruction (not too specific) to "test its operation".
>
> Mike / KK5F
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