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

[J. Forster]

OK. I'll continue to post to all.

-John

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

> Hey I am finding it interesting.  I have a couple old scopes I plan to
> fix, one with a similar deflection problem.  Include me if you can.
>
> 73
>
> Mike, KL6M      BP51dc      http://www.qsl.net/kl6m
>
>> 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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>>>
>>>
>>>
>>
>>
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