[Techtoolslist] Problems with Tektronix 475 Scope

[Matthew Rossiter]

I do have a hard copy of the service manual, which has a long list of 
"Voltage & Waveform" pages.  Based on Dave Riddle's suggestion I'll go 
straight to the CRT Circuit page and see what I can find.

It's nice they have an internal trigger source to test with. Otherwise I 
do happen to have a function generator handy.

Matt


On 2/13/2019 12:32 PM, John Robertson wrote:
> Hi Matt,
>
> Do you have the Maintenance manual from the FTP /Techtronics section? 
> Have a few service related manuals there...
>
> ftp://ttl.arcadetech.org/TTL/Test_Equipment/Tektronix/
>
> I have the operators manual in my 475 that isn't scanned yet...should 
> do it some day I guess.
>
> John :-#)#
>
> On 2019/02/13 10:08 a.m., Matthew Rossiter wrote:
>> Hi Everyone,
>>
>> I'm starting to have some issues with my Tektronix 475 scope where 
>> after it warms up for about 5-10 minutes the beam goes out.
>>
>> If I press the ch1/alt/add or ch2 buttons I see the beam flash 
>> on/off.  Same if I turn the trigger or delay knobs it comes in and out.
>>
>> Pushing the chop button brings both ch1/ch2 beams on for some 
>> reason.  After a while the beam will come back.   Letting the scope 
>> cool off will normally bring the beam back.
>>
>> Last year I did clean some contacts - this seems to be heat related 
>> though.   Has anyone seen this?   or is there forum out there that 
>> someone recommends specifically for old tek scopes?
>>
>> https://youtu.be/GZxO8YkzaBM
>>
>> Thanks!
>>
>> Matt
>>
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>
>