[time-nuts] 10811 Outer oven controller schematic

[paul swed]

Can popped open pretty easily. Now to start to measure voltages to see if
things are within tolerance.


On Sat, Jul 20, 2013 at 5:22 PM, paul swed <paulswedb at gmail.com> wrote:

> Hello to the group.
> As the various posts mention pulling the outer oven and taped wire off is
> a job. But thats done.
> The Osc is 45 Hz low hot and 200 Hz low cold. Bobs on target with his
> comment on what to expect. It does warm up and behave as you might expect
> but its all relative not exact even according to the 10811 service manual.
> So it could be off temperature. But very hard to say until I get a
> thermocouple in there.
> Will say the various rubbery stuff and shock absorbing stuff left one heck
> of a gooey mess.
> Oily sticky stuff.I tried oil, alcohol, turpentine, and finally gas. None
> really did anything. But what did was a soft plastic paint remover. That
> peeled the old tape and goo off very nicely.
> What was left was the true glue and that was removable by gas.
> It went from a gooey mess that stuck to everything to a pretty clean can.
> Next I used a small torch one of those small butane refillable units. Had
> it for years and never really had a use for it till now. I have started the
> process of opening the can. Thats not complete yet. But I cleaned enough
> goo off that when I heat things I don't have a smelly smoldering mess.
> Regards
> Paul
> WB8TSL
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> On Sat, Jul 20, 2013 at 1:57 PM, Bob Camp <lists at rtty.us> wrote:
>
>> Hi
>>
>> If a 10811 oven is simply not working, the output will be > 400 Hz off
>> frequency.
>>
>> Bob
>>
>> On Jul 19, 2013, at 12:48 PM, ed breya <eb at telight.com> wrote:
>>
>> > Paul,
>> >
>> > If the 10811 is that far off, are you sure the oven is working?  A few
>> years ago mine had a failure of a particular date code range of the opamp
>> that controls the oven, that were prone to failure.at high temperature.
>> The symptom in the Z3801A was that the outer oven seemed bad - it did not
>> turn on, but it was because it was waiting for the inner one to reach
>> nominal temperature, but it never did. Once you get it all apart,
>> replacement of the IC is no big deal, but what a PITA to get to it. I
>> vaguely recall posting the whole story on that website that has big
>> coverage of the Z3801A - I can't remember the name, since I haven't been
>> there in a while, but it should be easy to find. The website had all kinds
>> of Z3801A info, including a nice writeup on how to take the oven apart,
>> which is where I started.
>> >
>> > Ed
>> >
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>