[Techtoolslist] Problems with Tektronix 475 Scope

[John Robertson]

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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