Tektronix 222A Faulty Channel Repair

A dead channel has required to be creative

[@nohrtillman8734]

Never have I seen anyone go this deep into a Tektronix 200-series before! Because of your determination and the making of this video, I have gained confidence in repairing any of mine when they need it. Many Thanks!

[@Runco990]

What a marvel of engineering this was at that time. This is the first time I got to see one from the inside!

[@davidv1289]

Always a pleasure to watch your troubleshooting skills. It is very useful to have a battery-powered scope for working on switch mode power supplies, I have a Fluke 99B that I converted to lithium batteries. Another useful technique is to power the controller circuitry with a bench supply then power the SMPS input with a current limited variable DC supply for initial checks. The SMPS operates as a DC to DC converter and one of its inputs can be grounded. Some HP SMPS have this capability built-in. Regards, David

[@mymessylab]

many thanks, indeed it's a nice technic to use a bench dc power supply, nice tip.

[@t1d100]

Fabulous work! Bravo! Maybe add a little Kapton tape to the top of the optocoupler, for the sake of isolation...

[@mymessylab]

Thanks for the comment and the valid suggestion.