Tom, you definitely made my day with this very convincing excuse for having one of those instruments!! =D Chris

Good question. I don’t think it matters. An interruption in the transmission line does not care if it’s a LED or a bulb. I’m so trying this on some recalcitrant light strings. Glydeck KD6NEW

Hi Siggi and thanks for the reply. Did try with a PSU on that rail but couldn't feel any heat, although the voltage did immediately drop to zero. I must have motivated myself after making the

Hi, In the project of repairing something else (634 monitor) I rolled the ebay die on a local* 1900 test signal generator but definitely did not win, found it basically non-working (LEDs light

Was that incandescant or LED lights? I have an entire bin full of LED strings that are dead and that might be worth a try. Paul -- Paul Amaranth, GCIH | Manchester MI, USA

Hey James, I feel for you, I've suffered the slip of death too. For finding shorted components, you might consider powering the afflicted rail from a current limited PSU. Be sure and set the voltage

Just to add that so far have found three shorted caps.

Hi all. Looking for some help to repair an old Tek 466 which I accidentally damaged. The story is, that I bought it non-working and upon inspection found that the scope had been stored on it's face

Now that hadn't occurred to me! That's a really excellent example of using whatever is available to solve the problem at hand :) Thanks!

Tom, the 1502 is one of the most useful instruments around! I just finished finding the fault in a long string of Christmas lights with mine! :-) Definitely something essential to have around...

Hi Tim , I had that with a Chinese component analyzer with some 2N1516 and it was Tin wiskers . Once removed with a 15v psu it tested ok . Brian (UK)

My Peak DCA55 often misidentifies some Germanium transistors as BiColor LEDs. In particular those such as 2N2209 with TO7 bases. (e-b-Case-c; the Case lead has been clipped). Is this possibly

ISTR that the paper has holes down one side, and that a photodetector detects the holes. ISTR that someone has synthesised the signal from the photodetector so that the chart recorder works without

The XY module is trivial to make; the mechanics are more difficult than the electrics. The schematics are in the manual. Do have a look at the PSU caps. On mine C6246 and C6341 had spewed acid across

Very impressive work, Holger - well done! And I am now aware that the abbreviation DPO once stood for "Digital Processing Oscilloscope" in Tektronix speech - but my TDS5054 D igital P hosphor O

I doubt it, the HP self tests are pretty accurate in my experience. It sounds like you got someone's parts mule. Their in an HP group on groups.io, you might check with them.

I would start with any Transistor or FET that is located in the trigger generator or sweep generator circuits (this is an extensive list, refer to your specific instrument schematic). Start with the

Barry: The vintageTEK Museum has a stock of these relays and we can set up a special ebay sale for you. -- Bob Haas

Hi all,i hope its ok asking this here but here goes,i brought a hp 54503a scope with dead nvram and a dead psu,i swapped the psu,now it powers up but i get no trace,running self test brings up analog

any idea where to start checking then?,is there any common components can cause this?