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

[Ron Youvan]

Joseph VE7LBI Orgnero wrote:

> 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.

   As a guess, the horizontal amplifier has developed a major problem 
and there is a "resistor problem" in the "brightness control" resistor 
chain.
-- 
    Ron  KA4INM -  Next AReU meeting is on November 2, 2010 @ 7:30 pm