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Hi Gordon, Going back to the unblanking circuit again, diode D831 was added at a later date and may not actually be in your 547. This protects the circuit from damage due to arcing discharge, in

I don't remember which plug-in(s) was (were) cited, or what the reason was, but I do remember being surprised. I need to write this stuff down when see it. The comnent that I read was probably on

Thankfully, cleaning seemed to have done the trick in my case. No more flashing 000's and the switch works in all positions.

Your problem might not be dirty contacts. I recently found that my cam barrel had deteriorated and actually had shrunk. The end of the can barrel serves as a bushing that fits into the mounting

Interesting, I wonder why that is? Obviously contact cleaner wouldn't be a great idea for these type of contacts but I'm curious why paper wouldn't be recommended. Too abrasive?

I can't answer that question (I'm sure others can), but ISTR that the paper cleaning method should not be used on some TM-5xx(x) plug-ins. DaveD KC0WJN [email protected]> wrote:

A question for the next time I need to clean Tek finger contacts, is there a recommended 'type' or thickness of paper to clean the contacts? I used whatever garden variety paper that I had on my bench

Alright, I answered my own question. It looks like you can easily get at the finger contacts from the side of the switch that is next to the big vari cap. I was easily able to get a piece of paper

Looking at the service manual, it looks like the fingers on the cam side would be in the open position between switch detents. I'm thinking I can carefully slide a piece of paper in between the

I've got an SG503 on my bench that seems to be working fine on all ranges with nice leveled output, etc. However, the finger contacts under the cam switch need to be cleaned as I have to fiddle with

Hi Hakan Thanks for uploading these files. I had to get them via my ipad as my PC wouldn't let me download them. So I did it via icloud (never used icloud before). This worked fine. Thanks

OK, they are here for some time until you downloaded: http://www.hakanh.com/dl/temp/MSO.zip /H?kan

Hi Rich, Thank you for the info ! This is a bad news because this is the feature I need for my repair. Matthieu

Thx Bob, will follow yr suggestions.

Also, if anyone can download FW versions 2.62 and 2.68 for me that would be great. I've tried registering with Tek on their website but the registration process turns into a confusing mess with lots

Hi. I've got a faulty MSO4104 here (not the B version) and it has a bit of a history. Someone at work blew up channel 1 on the 1Meg input many years ago but the scope was still useful on the other

Thanks very much, Deon. I will definitely check those components and let you know. The experience of group members here is very much appreciated! Gordon

Check D831 which is decoupled 350V to the unblanking circuit. If it's gone short then that may explain the lack of intensity control and may backfeed to V393 and V193 causing the sweep to not start as

Thank you so much for the comprehensive suggestions, Mark. I will go through them and report back!

Hi Jim, Quite a bit of vacuum tube tooling was sold of and moved to Japan in the 1970's and 80's, including I believe many small signal pentodes and dual triodes like the 6DJ8. That U.S. built