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If you run the self test enough times, it may give you a reference designation of the at-fault chip IE U413. Keep in mind that the DMUX chips for each channel are not consecutive. From the edge of the

So to re-visit this issue I have been looking for the test failure mode. With both auto diagnostics and a manual step-through I consistently get a Calibration Data test failure (Test 04) and the

I ran the self test and got this error: "ERROR: diagnostic test failure, digDataFormatDiag, ERROR!!BYTE mode, in demux 198 ,i= 20 memBaseAdr 0x730002a= data = ffffb400, expectedData[i] =

Running the full self test from the utility menu should reveal whether any memory chips are bad. Looks like it could be faulty ram. I've replaced a lot of the 1Mb parts over the years, for some reason

Hi all, I recently acquired a TDS794D and am having an issue with Channel 2 and a slight issue on Channel 1. It was originally failing the boot self-test with a "ERROR: diagnostic test failure,

Welcome.

Hi Matt, Addressing power supply issues will hopefully fix the issue. If you still see the same behavior after PSU fixes you can check "Z Axis Out" voltage (right side of R856) in sheet <6>. In XY

Thanks Ozan, I can't see any changes at those test points when the horizontal position is manipulated. Ripple is within spec. Another poster led me to some more problems with the power supply.

I don't have any options. I'm using 2 roundhead screws without washers to attach the top shield to the power supply assembly.

Hi Mark, Your suggestions prompted me to look more closely at the preregulator board, and indeed there are a number of resistors that are out of tolerance - notably R911 and a pair of 100k 1/4Ws

Thanks for the suggestion. One reply on the EEVBlog post suggested that I remove the tube and inspect some of the components underneath, so I will test and manipulate the deflection plate leads while

If the 2465 has options (DMM, CTT, Video, IEEE-488), it may have the large top shield/motherboard Assembly that is mounted down inside the chassis body. There are two flat-head screws that go through

I recapped my Tek 2465 and I'm putting it back together but I have 2 extra flat head screws and I don't know where they go. Does anyone know the location of all the flatheads? 6 flatheads + 2 long

Thank you very much Ananda.

These are the specs for the part# 152-0552-00 3x mutiplier 5kV-15kV Series resistor: 510 .0 k

Dave, Ah! I see now. Yes, the threaded hole has a set screw in it. I had assumed that the rear flat head screw was holding the coax in place, and was wondering why it had a washer, when the screw at

On my P510’s and P410’s, the ground lead ends in a crimped-on ring terminal, which you secure to the probe body with a short 4-40? screw. 90 degrees from that hole is a second hole with a hex

Maybe you could just put a shim under one foot of the scope chassis? <ducks and runs> cje

Matt, Replacing the condensers would be advised. Something like Nichicon ULD, LGR, UHE and UCY are good ones. Raising the value is fine, e.g. 840mfd to 1000/1200mfd. Replace the RIFAs with X1/X2 and

From the schematics it looks like +100V supply is shared between horizontal amplifier and DC restorer (intensity). I recommend observing +100V at W967 in sheet <7> as you move the spot left/right in