Tektronix 2225 Oscilloscope Teardown and Calibration - EEVblog #208

It's all about the tongue angle when Dave tears down his Tektronix 2225 oscilloscope and tweaks a few of the pots to drag the unit back into cal.

Category:

Science & Technology

Tags:

• Calibration
• tektronix
• 2225
• analog
• oscilloscope
• adjustment
• vertical
• horizontal
• procedure
• service
• manual
• how
• to
• measurement
• tweak
• teardown
• crt
• danger
• cathode
• ray

[omgitschrislol]

If all the components that were convertable to surface mount during design were, how much weight do you think would be saved by using less solder? No video I have seen talks about this when talking about SMD stuff. I know this isnt an SMD video but its a question I have had for a while. Please respond =]

[EEVblog]

@omgitschrislol It ain't just the solder, but lead weight and associated smaller board space as well. I wouldn't like to guess at a number...

[Madmax23419]

I am made in holland to. :D

[EEVblog]

@Madmax23419 Are you the same vintage as the scope? :->

[GoneBadKiwi]

Thumbs up for Daves tongue angle & 1 eye technique

[44rdwolf]

Does it say "made in Taiwan" under the "made in Holland" sticker?

[3n2323]

Great video, thank you!

it is rare to see videos showing the disign thoughts and built quality of a scope, and the process of calibrating it!

great! very informative and useful!

thank you!

[Knaeckebrotsaege]

Oh and btw.. I see Adobe reader.. eeevil :|

Lightweight (and free) alternative: Sumatra PDF (google it)

[Knaeckebrotsaege]

Let's see... "Made in Holland" sticker over the "Made in Taiwan" silkscreen and a board copyright dating 1986, with the IC directly below it (+bodge job) having a 1991 datecode.. hmmmm..

[321reh]

I learned So much about My 2225 without taking it apart!! Now with this video I am equipped to maintain My 2225 ( with my Service Manual ) Thanks Dave!! Once again you have proved to me you are a very good at what you know!!!

[321reh]

Thank You Dave!! Nice Explanation!! I learnt a lot from this video!! Please ignore all negative comments!!! I`m a Electronics Engineering Technologist and Electronics Technician by trade and understood this video perfectly.. I think it`s hilarious that some individuals don`t find it important to have your scope properly calibrated!! And YES there are more problems in scopes or tv`s than just High Voltage Problems!!! I should know I repaired both!!! Your Video was the best 32 min I spent !!!

[321reh]

I can't believe some of the negative comments being expressed in this video!! Dave is explaining the 2225 in a Engineering perspective and in my opinion did a damn good job doing it!! I am Extremely impressed with your explanation( I own a 2225) Am I a Technician,,,,,Nope !! I`m a Electronic Engineering Technologist and ran a VCR repair for 14 years,,so I was a technician and a Engineer!!! Most Technicians can calibrate there scopes with the help of a service manual and a little know how!!!

[Lokivoid]

Looks like its a hell of alot easier to repair than my old tektronix 11401. The PSU fried on it and its been a complete nightmare to isolate the problem, or find a replacement parts for it.

[EEVblog]

@ae4se You still have NOT explained why the vertical adjust control SHOULD be on the main board under the CRT, in the last place I, and I think most people (who do not service these things regularly) would look.

Please enlighten us with your brilliant technical explanation...

[aptsys]

@ae4se Why 'SHOULD' the pot be under the tube?