Don't sweat that, it is nothing. I interpolated two plugs in a 7603 hat dumped 130 volts on the 5 volt line. Of course it took out the horizontal preamp output IC, one of the most unobtanium things in

Finally finished my 485 I used a pg506 a afg3012 and a agilent 6634b for gain adjustments. This is as close as i could get. 1 ns at 20mV with the pg506 and 067-0681-01 TD pulser

Hi, Of course, I played with all the trigger settings. Once warmed up: It triggers OK on setting Couplng: AC, HF Reject and Best on DC Source : Normal and Chanel 2 ( I mostly use Channel 2 but

Okey, you are in good company! Göran

You may not have "Done" anything. Like Chuck said... components dying can make sounds like that. Popcorn popping sounds. Explosive sounds.

Hi John, I am not like that. I have done all of these dumb things myself (and more). I am quite happy to call myself dumb, but you will have to decide how harsh you are willing to be with

Hi Forgive this if it's been covered earlier, I've been following this thread on and off but a) I'm not familiar with this particular power supply and b) I dislike/distrust switchmode PSUs! However I

I encourage the OP to go for the Artek Media 2213A pdf manual. I have it and the quality is superb, color, hi-res, full size fold out schematics, page links.......and you get it

Chuck, There are no burn marks on the scope probe, or ground wire, or probe alligator clip. The probe works fine. No burn marks on the 7A26. I tested it everything out on my 7834 storage scope -

The problem is, the current from the probe's ground lead is directly connected to the chassis at the BNC connector on the plugin's front panel, and at the finger stock around the front panel, and at

The resistance values I gave were using a Fluke. The readings weren't far off from my old VOM. I read last night that the 5v lamp voltage could cut off the inverter through the controller IC on the

Hi Phillip, I`m glad enough that the message came through before Max will actually need to crimp. Since the switch went off (on your side) without mishaps... you're all still happy. I wish I knew it

I just re-read the 7904 service manual section on testing the LVPS and the resistance given there for the +5 V point is 50 Ohms which compares well to your 47 Ohms. Following the procedure in the SM

Just to re-cap, your initial message indicated your probe ground lead contacted a high voltage point on a device under test with a common ground.  This would raise the scope vertical input ground and

Good idea for a load. I was wondering I have some ribbon cable (like this: https://www.ebay.com/itm/273079315705) that I could use to extend the cables further out the back of the unit - do you see

That is quite a selection of free manuals someone is offering, but both of the manuals they have are for the non-A version of the 2213 which is a much different oscilloscope than the 2213A, especially

If they all read high in resistance, then a likely reason is that they're cold. If it was one or two...but all of them ? There is still probably something wrong right in that power supply. Not sure

Hi Mark, I will try this weekend when I have time, erasing nvram except for locations 1e00 to 1fff to establish whether exer02 obtained data is sufficient to keep scope "functional". If you know for

Jeff, I measured those resistances with both a Fluke and a VOM.

Thanks Steve. I'll check the diodes today. I haven't spent much time on the regulator board - I was figuring the problem came before that on the inverter and rectifier boards.