tektronix 577 & 576

[f6iib]

I just bought a tek 576 from a leasing company
works but has focus problem
anyone with maintenance manual around in pdfs ....
best regards
patrick

 

[David C. Partridge]

For the 577 (not 576) see: ftp://bama.sbc.edu/downloads/tek/577-177-d1/

 

[Jim Yanik]

For the 577 (not 576) see: ftp://bama.sbc.edu/downloads/tek/577-177-d1/

Not anything similar.577 is based on the 5100 series scope chassis and
display,the older 576 is WAY different.

Perhaps a bad resistor in the focus string?

 

[Andreas Tekman]

Hi Patrick,

yout topic is a little misleading because you mention both the 577
*and* 576.

Do as Jim recommended. Check the HV area and the focus restor chain of
your 576.

The 577 diagram (or very similar in the HV area: 5100 scope diagram)
might be helpful to get a genral impression how Tektronix curve tracers
are set up in this area around the CRT.

Fotr the 577: David's hint is valuable.


hth,
Andreas

 

[carneyke]

Patrick,
The focus is a compromise of the focus and astigmatism setting. Tweek

 

[Jim Yanik]

Patrick,
The focus is a compromise of the focus and astigmatism setting. Tweek

and if the CRT is getting weak,it will naturally defocus;the beam is
emitted from a larger area of the cathode.

 

[Man Li]

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http://dev.ap.com/index.php?page=products&id=1100001060


Best regards,

Man Li
AP Technology Ltd. www.AudioAPT.com