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

[Joseph Orgnero]

Thank you John,
I'll go over the scope again and report on your questions.
Joe
----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Sunday, October 10, 2010 12:13 PM
Subject: Re: [Test-Equipment] WTD: Help with old scope problem


>> Hello John,
>
> [snip]
>> - Focus has some effecto on the trace but not intensity (strap on rear 
>> OK)
>> - With  9 VAC applied to the H input on the back, the spot becomes a
> line, so, I assume that the H amplifier is OK.
>
> Does the length of the line vary as you adjust the Horiz Gain (Rear 
> Panel)?
>
>> - With  6 VAC applied to the V input, I get a circular pattern (same
>> phase) and multiple patterns with a higher frequency.
>> - With the voltage calibrator connected to the V input, I get two bars
>> with some hint of a square wave. I image due to the low frequency of the
>> H input.
>
> This was with the 60 Hz applied to the Ext Horiz or not?
>
>> Both voltage controls (V and calibrator) displace the bars.
>> - Neither time/division nor trigger controls have effect on the display.
>
> Try rotating the Time/Div and Trig through it's full range. Do you get any
> sweep while rotating the knob?
>
> Set the Horiz Disp to X5 Mag. What is the voltage at pin 8 of V220B with
> the Hor Pos set fully CCW and CW?
>
>> - Any way to narrow it down?
>
> Yes, follow the instructions above and report the numbers.
>
> Best,
>
> -John
>
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