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

[Greg Mijal]

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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