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Hi Peter, It seems to be a combination of a couple of bad brands of capacitors, and an engineering thing. The biggest issue is capacitor rating voltage vs applied voltage. It should be greater than

This would apply to all this series. I got a 8711B with a bad power supply.? I tracked that down to an open trace caused by corrosion in one of the mag amp circuits. The unit still wouldn't power

Yes, Lift One Leg (LOL) to coin yet another Three Letter Acronym (TLA).? A YAT (Yet Another TLA).? Et cetera, etc cetera, ad nauseam.? About the only Latin I remember from junior high school 40+

Or, perhaps more likely, due to something else in parallel with it. You simply can't check devices in circuit with any reliability. Yes, if you read an open in both directions, it's obviously a dead

I've tested a few of these 1901-0347 diodes that came from some 3702/3 boards I was given, after checking the color bands match those in the HP 209A I have. The component tester can only do 12V,

Out of circuit, the old part tested as a small-value capacitor. I replaced it with a new Si Schottky and it works like it should. No more fat traces in CHOP mode! Thanks, Barry - N4BUQ

Yes, that helps. I plan to test a new Schottky and if it doesn't have that same reverse voltage, then I'll lift one leg of the existing diode and check it. If it still tests differently than a new

Thanks David, very useful. Renaud

I have an 5316A/B OCXO listed on EBAY that should work in the 5315A/B since they used a similar module. I have only tested it in a 5316B. Pins 1 and 6 are 7.5V unregulated power Pin 2 is 10MHz Pin 3

Since this is a power supply that you will start out testing at NO load on its output, I'd start with a much lower wattage bulb in your dim bulb tester. You can calculate an approximate wattage by

HP part numbers have the type of component etc coded in the first four numbers, some examples below; Diodes: 1901 = silicon 1902 = zener 1906 = dual/bridge 1910 = germanium 1912 = tunnel 0122 =

Hi. The "Usual" scheme, is for both the bulk storage caps to be wired in series at all times, with balancing resistors across each of them...? (To compensate for slight variations in leakage of each

I do not see that part number in the manual. I only see the TCXO 05315-60007 ed

The book gives part no. 1901-0347, a bit of searching the web and a picture of the parts bag it is labelled "silicon", hot carrier is a Schottky diode, volt drop will vary with current, this part

Many email addresses on groups.io are mangled for reasons that are not clear. To get to hardy's email, use "reply" and then go to the "TO: field and edit the address. Change the "=" to "@", and

Nice approach Wilko :) I will apply deoxit on dip switch to ensure function. If it's a clue, it's been a while since I reached this same point in the service manual (by the way, I haven't had time to

Looks like we have a one-way email path. Tried both addresses and this time I did get an error, on both addresses. One was simply rejected, the other address not found. Your old address did

The bulbs are non linear resistors, so it depends on the load, I would connect a voltmeter across the input terminals of the power supply if you are using a dim bulb setup to plug it into. If I was

I have never needed to use more than two, 100 Watt bulbs in parallel. Peter

I'm still searching for the problem that causes noise to enter the system when the MODE is set to CHOP and subsequently causes the traces to appear much taller/fatter. Some of the waveforms I'm