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

[Joseph Orgnero]

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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>>
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