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]

"David C. Partridge" <mimx64xwy@dsl.pipex.com> wrote in
news:XL6dnVLj47UxKsHZRVnytQ@pipex.net:

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?

--
Jim Yanik
jyanik
at
kua.net

 

[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
both for the best circular "dot". Take Care, Kevin
f6iib wrote:

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

 

[Jim Yanik]

"carneyke" <carneyke@localnet.com> wrote in
news:1147345797.842020.77300@i39g2000cwa.googlegroups.com:

Patrick,
The focus is a compromise of the focus and astigmatism setting. Tweek
both for the best circular "dot". Take Care, Kevin
f6iib wrote:
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

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

--
Jim Yanik
jyanik
at
kua.net

 

[Man Li]

¸÷ÎťŁŹ×îĐÂ8ͨľŔŇôîlˇÖÎöƒxŁĄşĂËƺÄšŁÓĐĹdȤżÉŐŇÎŇŁĄ

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


Best regards,

Man Li
AP Technology Ltd. www.AudioAPT.com