[Test-Equipment] WTD: Help with old scope problem

[J. Forster]

Joe,

I'm happy to help but need a schematic or a link to one.

You might also want to ask on the Tekscopes2 Group on Yahoo. There is also
a Tekscopes list but they are less helpful, IMO.

Best,

-John

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




> Thank you Greg,
> I do have a manual and I have gone through the cleaning procedures. I
> think
> the problem is hidden somewhere on the sweep circuit, I only need to
> acquire
> enough wisdom to find it.
> Joe
> ----- Original Message -----
> From: "Greg Mijal" <bluebirdtele at embarqmail.com>
> To: "Discussion of Electronic Test Equipment"
> <test-equipment at mailman.qth.net>
> Sent: Friday, October 08, 2010 11:28 AM
> Subject: Re: [Test-Equipment] WTD: Help with old scope problem
>
>
>> Have a look at the controls that affect the scope's sweep.  Lots of old
>> scopes have "iffy" controls in them and need a good cleaning after time.
>> My
>> Old TEK 455 Ch 1 bnc connector is so decrepit it will no longer mate to
>> a
>> probe.  The other thing is, if a good switch clean up gets you nothing,
>> you
>> are going to have to find a manual for the scope and troubleshoot hte
>> sweep
>> circuits.  You'll get the calibration procedure with the manual and as
>> Martha  Stewart says: It's a good thing.
>> 73's & good hunting
>> Greg
>> WA7LYO
>> Kinston NC
>> ----- Original Message -----
>> From: "Joseph Orgnero" <josepho at shaw.ca>
>> To: "Discussion of Electronic Test Equipment"
>> <test-equipment at mailman.qth.net>
>> Sent: Friday, October 08, 2010 1:55 PM
>> Subject: Re: [Test-Equipment] WTD: Help with old scope problem
>>
>>
>>> Thank you Bob, the rest of the messages received agree with a problem
>>> on
>>> the
>>> horizontal sweep, question what is the guilty component?
>>> Joe
>>> ----- Original Message -----
>>> From: <WA5CAB at cs.com>
>>> To: <test-equipment at mailman.qth.net>
>>> Sent: Thursday, October 07, 2010 4:05 PM
>>> Subject: Re: [Test-Equipment] WTD: Help with old scope problem
>>>
>>>
>>>> Joe,
>>>>
>>>> I'm not familiar with the 310 but your last point (spot splits in two)
>>>> is
>>>> consistant with loss of horizontal sweep.  The cal signal is a square
>>>> wave.
>>>> The vertical amp is still moving the trace up and down as it should.
>>>>
>>>> In a message dated 10/7/2010 5:55:42 PM Central Daylight Time,
>>>> xyzzypdx at gmail.com writes:
>>>>> >Hello
>>>>> >For a number of years Ihave been using a Tek 310A on my bench. I
>>>>> like
>>>>> >it
>>>>> on spite of its age and limited BW because of its small size and
>>>>> sharp
>>>>> trace. Recently,after not have been used for some months, presnted a
>>>>> number of
>>>>> problems.
>>>>> >- There is no horizontal trace, only a spot.
>>>>> >- The spot can be moved in both directions (V&H).
>>>>> >- The focus control has only limited effect on the spot.
>>>>> >- The intensity control has no effect on it.
>>>>> >- The tubes related to the horizontal and sweep sections check OK.
>>>>> >- There are no broken, burnt or overheated components.
>>>>> >- LV voltages are OK but I cannot get a reading on the HV test point
>>>>> (5642 rectifiers).
>>>>> >- If I apply a signal from the voltage calibrator, the spot splits
>>>>> on
>>>>> two.
>>>>> >Any suggestions as to the cause of these problems (and fixes) will
>>>>> be
>>>>> greatly appreciated.
>>>>> >Thanks
>>>>> >Joe Orgnero  VE7LBI
>>>>>
>>>>
>>>> Robert Downs - Houston
>>>> wa5cab dot com (Web Store)
>>>> MVPA 9480
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