[Techtoolslist] Problems with Tektronix 475 Scope

[John Robertson]

On 2019/02/13 6:54 p.m., Matthew Rossiter wrote:
> 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
>
In one of the docs on TTL I saw a very nice test PCB from Tek that gave 
ramps, etc. Anyone have that board?

ftp://ttl.arcadetech.org/TTL/Test_Equipment/Tektronix/Tektronix-Scope-Tester.pdf

Would be nice to make up, or is something like that readily available?

John :-#)#

>
> 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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>>
>>
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