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I read as many old threads as I could before this. Waded through tons of web pages and some of that is summarized here. I've installed a 20dB 100 watt attenuator in my 8924C and need to load the

Thanks Dave, will definitely look into that. Bryan

Thanks Greg. I did not see any schematics for the 8935 in the file section, but I'll take another look. Bryan

The biggest problem with the 8935 power supply is the open 47uf/50V capacitor on the daughter board. You need to remove the rear power supply, remove the first circuit board and the main mother board

HP 8920 power supply help: Here are the main problems with the HP 8920 power supplies: If your supply fails but the fuse does not blow: the first thing to check is the R3 resistor it's a 470 K ,1/4

Make sure to check resistor R3 for OPEN...it will keep Q1 from working......it may look just fine but be open.. Dave

There is a power supply schematic in the files files section.GregWB9TRO?Sent from my Galaxy

No schematic attached..could you please attach one...thanks..

Hi, I have the schematic of the 8920 model. It is not in the normal download of the CLIP. It was manufactured by an outside company for HP (Artesyn), along with the Spec An Module. I have attached two

I've never found schematics for 8935 series. Closest you can get is the HP 8920 CLIP (Component Level Information Packet). Some of the modules are same / similar but power supply is way different (but

Can't locate any schematics for the 8935, nor a parts list for the power supply. Anyone ever compile a parts list after recapping their 8935 power supply? TIA, Bryan K6RBJ

Rick, thanks for the reply. Yes, I am aware of that message. I removed them (due to age) when I took the back cover off to check the LED status on the motherboard. I just haven't gotten around to

The 40V supply is crucial as it is used in various PLLs for VCO PIN diode tuning voltage. Have a look in the Agilent 8935-E6380A Assembly Level Repair Guide page 78. I bet several modules have the OOL

The screen says your AA memory batteries are low. I would test them and replace if low. If they measure good, perhaps there is a problem with the A/D conversion that measures voltages.

So all 4 green leds are lit, but it appears the 40 volt supply may have issues according to the test. See attached screenshot.

Thank you. Will start there. Much appreciated. Bryan K6RBJ

Hi Bryan, ?? In the unit on the mother board are 4 green LED's that should all be on. They are the +,- 5Volts, 12 and 40 volts. I would check them. Rick

Turned on my 8935 a couple days ago to check a low band Vertex radio that had been set up for 6 meters. No power or frequency readings on the RF Analyzer nor was the RF signal generator heard thru the

Hi, I've built a GBS8200 converter with the well known LM1881 circuit. There is a clever design available for a 3D printed (FDM) enclosure: https://www.thingiverse.com/thing:4666227 (provides BNC

based on what screens you have included the first thing I would look at is your generate output level.? Suspect the counter failures are due to a low level and the MISC DIAG is due to the same. Look