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

[J. Forster]

OK Joe,

Let's take this off list so people don't get bored.

Best,

-John

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


> 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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>