Help Tektronix 466 repair advice

[epicfatigue]

Re: Help Tektronix 466 repair advice

Hey Everyone,

Post was slow, i finished my HV probe it worked perfectly.
I did a test before i took the measurements on a lower voltage to ensure the
divider worked and it did!.


Sure enough on reduced scan i am getting my near normal operating voltages and on
normal i am getting well below.

-----------------Expected-------------------------------------
TP1501 -3010 Reduced Scan

TP1501 -1470 Full scan


------------------RESULT-------------------------------------
TP1501 -1702v Reduced Scan

TP1501 -369v Full scan





Q1472 Base = Reduced Scan 0.520
Q1472 Base = Full SCAN 0.460


Q1492 Base = -7.92 Reduced Scan
Q1492 Base = -7.92 Full scan


Q1496 Base = 18.38v Reduced Scan
Q1496 Base = 18.38v Full scan

[epicfatigue]

Re: Help Tektronix 466 repair advice

Thanks all,

Its good to know i am not wasting my time, everything in life i learn thus far has been from the ground up and i have always came out better for it.

Once i have the unit working i was going to buy a signal generator to recal it myself.

Iv joined the Tek group just need some better equipment i am waiting on some resistors in the mail to build my HV probe,
Just a simple voltage divider.

While i was waiting i have been building my variable Power supply,

Has 4 fixed voltages and 2 variable voltages.

Also has two different variable voltages controlled by a switch.
0.5-30V 20amp
0.5-30V 3amp

I am just waiting on the double gang pots and my switch to come before drilling the holes in the face plate.
I made the box so big that it would actually use less space so i could sit my test TV on it.

Fixed +32V 20 amp
Fixed -32V 3amp

These are on two different rails so are isolated from each-other.

Fixed +18V 20 amp
Fixed -18V 3amp

[budm]

Re: Help Tektronix 466 repair advice

You have already learnt a lot about troubleshooting this scope, nothing wrong with fixing, learning and develop logical thinking at the same time. When you have good foundation in troubleshooting, it will be real good knowledge to have for the future. So keep on learning.

[twbranch]

Re: Help Tektronix 466 repair advice

Kirakos please keep the thread crapping to a pm mate.

Wanna get this thing fixed not turn it into a war between people.

Hurling abuse at someone you cant wrap your hands around is a waste of time. I understand this will throw it out of calibration but once its working my work has one i can use to re adjust it, however no one there knows how to use it.

Anything you can contribute is a big help and i do take everything on board, and it is all appreciated. If i didn't have a family to support i would love to do this as a trade however as we all know life is not always as we would like it to be and i have missed the boat.

best thing to do with that guy is add him to your ignore list or you will put with that constantly! not tryin to hijack just lettin gyou know

[twbranch]

Re: Help Tektronix 466 repair advice

Join the TekScopes yahoo group. Those guys know a lot about the old tek scopes. They helped me with my 453.

[epicfatigue]

Re: Help Tektronix 466 repair advice

epicfatique
The Tek 466 is discontinued product (long discontinued!), so don't waste your time calling TEK.

Yeah i know i called them they had nothing to say about the model,

i am currently waiting for my HV probe to come, once that arrives i will be able to check that side of things because i believe that is where the problem is lying at the moment.

[MDOC]

Re: Help Tektronix 466 repair advice

epicfatique
The Tek 466 is discontinued product (long discontinued!), so don't waste your time calling TEK.

[Kiriakos GR]

Re: Help Tektronix 466 repair advice

There is some poor actors in this forum, that had turn in to personal hobby to insult other people.
They will get my boot on their face as reaction of defense its and every time that they act that way.

@epicfatigue
Do not worry about your thread is still here and it will be.
Regarding the scope, similar to it they are listed on Ebay for 50 to 80$,
my last suggestion about it to you, would be to do a telephone call to the nearest TEK service department in your area( state) , and speak directly with their repair man (engineer).
If you mention the problem he will have for you an quick tip that it will determine if this scope is possible to be saved.

Take care and regards.

[epicfatigue]

Re: Help Tektronix 466 repair advice

Tom can you please show to us your Face ?
Any advice haves the value of the Man behind it.

Question : Are you a TRUE man or a 50/50 one ?

Kirakos please keep the thread crapping to a pm mate.

Wanna get this thing fixed not turn it into a war between people.

Hurling abuse at someone you cant wrap your hands around is a waste of time. I understand this will throw it out of calibration but once its working my work has one i can use to re adjust it, however no one there knows how to use it.

Anything you can contribute is a big help and i do take everything on board, and it is all appreciated. If i didn't have a family to support i would love to do this as a trade however as we all know life is not always as we would like it to be and i have missed the boat.

[Kiriakos GR]

Re: Help Tektronix 466 repair advice

Please ignore Kiriakos.

Tom can you please show to us your Face ?
Any advice haves the value of the Man behind it.

Question : Are you a TRUE man or a 50/50 one ?

[epicfatigue]

hey Tom thanks for your reply,
Yes i have tryed the default settings and not luck.

As per the video when i press the beam finder i get nothing.

But if i pull out the intensity knob (reduced scan) i get a beam.

[tom66]

Re: Help Tektronix 466 repair advice

Please ignore Kiriakos. I doubt the majority of tinkerers/hobbyists require high accuracy -- and besides, replacing an op-amp and transistor in the power supply is unlikely to affect the calibration one bit, no more than line voltage variations.

--

OP: Have you tried setting it to the default settings above?
PSU voltages still good (maybe replacement op-amp was insufficient?)
Is there a beam find, does this work?

[epicfatigue]

Re: Help Tektronix 466 repair advice

that was devastating to hear, sadly no one out here repairs them, and i do not have the money to buy another i will have to put in the hard yards.

I have noticed it almost seems like the beem is being deflected.

https://www.youtube.com/watch?v=tXx0g8OF3QI

[Kiriakos GR]

Re: Help Tektronix 466 repair advice

Hey everyone, i am getting into electronics and have been toying with them for the last 8 months...........I brought it to learn how they work and gain some experience............Any suggestions ?

This device needs some one been toying with scopes repairs for 15 years,
find one and pay him to do it.

Alternative advice: sale it again as damaged, and get a cheap 300$ Rigol, so to learn to use fresh made tools capable to make measurements on modern electronics.

Those instruments is all about correct measurements and accuracy, and this aged scope will need even calibration, which translates to more money and time spent and it does not worth it.

Yes I am aware that I am giving you bad news, but you may ignore them so to feel better.

[epicfatigue]

Re: Help Tektronix 466 repair advice

well that was short lived was playing with it testing it, pressed the store button, now i have lost the trace again....

checked the psu everything checks out...
All the voltages are there guess something died further
Any subjections ?

[Radio Fox]

Re: Help Tektronix 466 repair advice

That's great. Hope you enjoy using it.

[epicfatigue]

Re: Help Tektronix 466 repair advice

She lives bad op amp and transistor!

[epicfatigue]

Re: Help Tektronix 466 repair advice

okay so i finally found the correct diagram,

Layout is Page 275

And Power Supply & distraction page 292

I have highlighted all the components and i am going to remove them 1 by 1 and test them there is only a total of 17 components

3 transistors
5 capacitors
7 resistors
1 VR resistor
1 op amp


Was thinking about testing them in that order.

[Radio Fox]

Re: Help Tektronix 466 repair advice

I hope so!

any idea where to start looking.

iv joined the Yahoo groups and posted my findings there

The Tek Yahoo group is a good place to start. I am a member there, but haven't visited it for a year or 2 now.

If I have time I'll post again later, after having a look at the schematics.

[epicfatigue]

Re: Help Tektronix 466 repair advice

Yep. A missing voltage in the PSU is usually one of the easiest faults to find. Let's hope that that's the only problem.

I hope so!

any idea where to start looking.

iv joined the Yahoo groups and posted my findings there