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Hi all, I've been working on rehabbing a TG501. After replacing the shorted Tantalum filter caps on the 15v supply the device has operated pretty well. I've been learning the operation, circuits, and

This is fantastic work, Holger! I have a disembodied P7001 that I keep meaning to add to a 7704 so I can play with it. Or, finally accept that I will never get to it and pass the p7001 to a new

If you have a high-resolution DMM, you can play a game of warmer/colder by measuring the voltage across components or traces. If you pump 1A in, you'll have a voltage delta of 1V per Ohm. The traces

The LV rails are within reasonable limits excepting about 1V ac ripple on +15v and about 0.3V ac ripple on the +5. Will look at replacing some of the huge pre-regulator filter caps before giving

I have to ask how you handle the transition from coax to the Xmas lights? And how you interpret the results. A picture of two may be worth a 1000 words. D.

Hmmmm.... I? wonder if the wife will let me buy an 11800 series scope and an SD-24 for finding bum bulbs?? I suppose it would only work for strings and not net lights.? ? Jim Ford?Sent from my

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