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

[J. Forster]

Joe,

Do you have a link to the schematic? I'll be happy to take a look, but 
couldn't find the print in a quick search.

Best,

-John

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


> Joe,
>
> If you don't get any horizontal movement even from the external inputs
> then
> the problem is between them and the CRT deflection plates.  As the
> vertical
> works, the problem must be in the horizontal amp.  But I wouldn't know
> whether that is one stage or several.
>
> In a message dated 10/8/2010 12:55:48 PM Central Daylight Time,
> josepho at shaw.ca writes:
>>
>> 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 & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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