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The 'J4' connector ('J4' is silk screened right next to it) is one of the solid board-to-board connectors; It's shown with 'J4' superimposed over it in figure 7-15 in the 475 manual - on one of the

Hello Evan, I have what is left of a 556 scope. I just checked and both high voltage (plastic rectangular) enclosures are still in the chassis. The front panel and low voltage transformer are also

Look at the data sheet for the Nichicon HE series capacitors, in the 'endurance' section it says that the capacitor's life doubles (in hours) when you go up from 6.3 mm to 12.5 mm diameter. This fits

I have been told that skinny electrolytics dry out faster. Regards, Mark

Hi Mark, That is an interesting point you make about using aluminum electrolytics with a higher diameter to length ratio. A recent capacitor discussion on Tekscopes included links to capacitor data

On Sun, Aug 12, 2018, 17:58 Mark Goldberg <marklgoldberg@...> Huh. Who knew tantalums could be emotionally conflicted. Mark >

machineguy59@...> wrote: I have been using Kemet T494 series SMD -55 C to +125 C Low ESR Tantalum for a very long time in aviation products and have not had issues. They claim to use

The ACQ board I posted for availability earlier has been spoken for. My thanks to Jim Finch. Keep the peace(es). -- --- Bruce Lane, ARS KC7GR http://www.bluefeathertech.com kyrrin (at) bluefeathertech

Can you better identify "J4" or give the capacitor designator from the service manual? One of the common failure points is a tantalum 47 uF cap (C1318) that filters the DC supply to the HV generator.

I have recently become the proud owner of a 475 that I found abandoned at the side of a road! Other than a couple dents in the casing, it appears to be in pretty good condition. After replacing the

I would be interested

Hi Harvey, Thanks for your email. It was very helpful. I was working with the scope for a while, turning it off and on a few times, and finally the screen came up. I suspect that since the scope

Hi Gypsy, The question is too open-ended. It is expected that you would ask it and then list the 'five' basic tests you ran and their results. The 464 S/M itself has a Troubleshooting chapter for you

I have a surplus acquisition board, P/N 679-4774-02 (from the label) or G9F-2841-00 (from the top copper layer). It was, as far as I know, working when pulled out of its host TDS520. The 'scope itself

I don't share your disdain for tantalum electrolytic capacitors.? Their dramatic failure modes to happen when they are operated near their rated voltage.? For this reason, I de-rate their voltage

So you replaced parts who's current main failure mode is less capacitance with a part who's known normal failure modes are burns up in flames taking out the PCB or short circuit taking out the parts

Howdy all. Was trying to calibrate a DM501A this weekend. DC volts calibrated with no issues however AC volts and dBmV did not. In both cases I ran out of pot room just a tad before I had it in

On Sat, 11 Aug 2018 20:31:33 -0700, you wrote: All the lights ought to come on, then the power up sequence starts. You should hear relays clicking, and you should see different lights on the front

https://www.ebay.com/itm/132740408593?ul_noapp=true No affiliation.