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?

I happen to have a whole pile of those, if anybody wants one. Feel free to contact me off-list... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in

Hello Reg, The 1502 is the first time 2 of my hobbies have come together, electronics and woodwork. I can get rolls of paper that fit our credit card machine and with a fine blade they can be cut

All I have is the roll of paper that came with it. Since my post I've read the service manual and now understand the BNC output waveform. The narrow pulse is the sampling arm signal. I just made a

I did. It was a bit of tedious work to derive the equations from the gate programming. Afterwards I noticed the source where I got the JEDEC file had also posted the original equations from which

After getting my 7B50 to produce a sweep, I noticed that the x10 magnification function isn't working and traced that to a bad K780 relay (P/N 148-0034-00). I noticed the TekWiki page for the various

Do you have a good supply of paper for the chart recorder? If not, whether the chart recorder works is moot! Personally I think the X-Y output module is more useful: at least that can be fed to a

My 1502 arrived today. Unfortunately, I either have a fault in the RECORD function or completely misunderstand the manual. The paper feeds if I push the switch up. However, I do not get an accurate

Here’s an update on the 465B trigger circuit JFETs. First, I’ll provide details for those interested. Others, just skip to the last couple of lines for the conclusion. Reading the schematic from

Zen, I converted all of my TG501s over to "Option 1" Units with the 5Mhz Oscillator. This might be a solution as well. -- Michael Lynch Dardanelle, AR