开云体育

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

As a happy Amtronix customer, I’d say get a quote to ship it to them to look it over. They know these units like no-one else. Colin

Hello everybody, I acquired a used 8920A in decent condition with what was described to me as "smelly power supply". Sure enough, many of elctrolytics were leaking and starting to damage the pcb.

Thansk you very much. I'll get some before I open the beast.

The Diodes (2) to detect duplex port power were HSMS-2800-TR1 but are no longer available. The replacement is: BAS70-05?? the Mouser elect part is: 771-BAS70-05-T/R Good luck...Rick

What kind of diodes are they? I tried putting a load on the duplex port, thinking that might make it happy, but unfortunately it didn't help.

Jim, duplex alarm is generally the 2 diodes right at the duplex output (in the input module).? Are leaky/open. Rick

I get the duplex overvoltage message with the alarm sound which drives me nuts. I am not even using the duplex out!? I mostly use RF I/O for my application. I tried measurement reset, but it

Thanks for the reply. I saw the posts about replacing those caps which I replaced on both units. The issue is still persisting. I also attached a photo of the GFCI that is installed in both units on

Regarding an hp 8935 that won't turn on, did you try replacing the 47uf/50V cap on the daughter board of the power supply? That is a common failure. You need to remove the rear power supply then

Rick, Both are HP 8935/E6380 model units. I have replaced the switch that is located on the right side at the back of both of the units. I have plugged them into different power sources with different

Jason, ?? Are these hp 8924C units? A common problem with the 8924C is the on/off switch. Unlike most instruments, the 8924C turns off by a switch closure. After time on some units, the on / off