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I recommend another weekend and replace all tear drop tantalums, it will happen again and again over time if you do not remove all. Regards Gerald VK3GM

WB8TSL: .... The 8663 supply is pretty much the same. The 20 V reg is pretty simple and can be traced out if needed. But check that the 20 V is not shorted to ground. The smoke makes me think

Hi Tom thank you for the link to the power supply I have uploaded it to the E4418-9 file along with service and user information Regards Paul B

I can assure you: A steady-state voltage of approx. 10.5V (mind the polarity: Q502's emitter 10.5V more positive than its base, as may be concluded from 3) and 4)) between Q502's emitter and its base

---- If 1V-1.5V measurements are with no power applied then Q502 is bad as Raymond also suggested. |Vbe| shouldn't exceed ~ 0.7V even in-circuit if power is not applied.

I double checked my DC measurements for the cathode of CR502 and the emitter of Q502 and they were the same as above. Put a scope on pin 6 of U502, and there is minimal AC. 52 mV max. These are

Quick update on this one, mostly replying for completion. I located the suggested 2N4117A from Langrex here in the UK for a measly ?3.50 which was acceptable coin for this DMM. Arrived today. Did a

... as Ozan correctly says. Raymond

I assumed you were looking with a minimal amplitude AC signal. If incorrect, you're unnecessarily complicating things and making measurements with a DC meter essentially useless. Raymond

Thanks Jim.? I don''t know where to look for the input to the attenuator so I better start reading the manual.? Your diagnosis is what I hope is the problem, since repairing that may not be as

The 86200 is a entirely different architecture as the regular HP sensors , it is a diode based sensor that contains correction constants inside a EEPROM , if I remember they were based on the 85037

Hi. Apologies if I've asked this here before, but the grey cell doesn't recall doing so... I have two 86200B 50 Ohm 10 MHz to 3 GHz detector probe assemblies (with cables) that came with my slightly

--- DC voltages do not add up to correct values, are these voltages in a state where output also has a large AC signal on it? For example cathode of CR502 is at -9.446V, which is the same node as base

The combination of 3) and 4) would indicate Q502 has open base-emitter. Raymond

First red flag is the missing seal on the top screw which indicates someone been in there before . The phaselock message normally clears once the unit warms up but it could also be a indication of a

Hi Tom, Thanks for the datasheet. I saved it for next time. This time I got lucky - another one of those resistors was open. It was the same value as the one I replaced several years ago, so I still

I sounds like there may be a problem with the reverse power protection.? There are PIN diodes in series with zener diodes to ground in the protection circuit and it sounds like perhaps one of the

Hello Lothar and HAKE community I just got cables shipped to me, and planned to use a semi rigid microwave test cable for early check out between 8671b generator and 8566b spectrum analyzer. I had a

Hi Razvan, I don't have a schematic, but mine has an Artesyn NFN40-7608. The datasheet is here. https://datasheetspdf.com/pdf-file/454677/ETC/NFN40-7608/1 Is the standby light on, or do you get

According to the manual on the Keysight site, 08562-90124 should be a complete set of the 'latest' CLIPs. The CLIP for A4 2923A prefix should be 08562-90128. You'd have to ask Dave at Artek whether