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Also, been looking at the LCD conversion since the CRT has burn-in, but it is bright and works otherwise. Alas, one step at a time, and needing to be careful with funds at the moment. Spent enough on

I didn't see a HEDS or GEDS number or any numbers on it at all, I'm just replacing the Emitters in it for now and see what happens, really i can use any 2-bit quadrature encoder, doesn't have to be

Nathan it’s great to see you’re seeing the light at the end of the tunnel. I must ask if there’s an HP p/n on that encoder? Should be a HEDS #### number on it. I didn’t look when I had my unit

The encoder from a 8922 may be the same. It appears to be based on the 8920. Glenn

Nice job Nathan.? I would take Rick up on the needed part. 73, Tim KB2MFS

Might check ebay Steve Flory W9KOP

Conversely, when these HP units were designed,? rotary encoders were not as widely available as standard products.

Nathan it’s great to see you’re seeing the light at the end of the tunnel. I must ask if there’s an HP p/n on that encoder? Should be a HEDS #### number on it. I didn’t look when I had my unit

Nathan, If your rotary encoder repair to the sub-component level fails, or you just want to get something working temporarily to get on with further troubleshooting, there are dozen of these rotary

Oh the carnage, but seriously, it's actually a simple device on the inside, surprising. Two upper Emitters and Receivers for the out of phase pulses to tell the machine which direction, which is fed

I'd be interested in a spare in case I fail, but, I did manage to desolder it from the button panel, and disassemble it. Found the IR LEDs are burnt out (reading open), the receivers still work

Hi Nathan, Is it the push function to enter the command, or is it the encoder part that makes the coded instruction? I would think the enter could be rigged up mechanically to push almost any sort of

Hi Nathan, ?? I can send you one of those encoders for $40. It will be a used pull out from another unit. Rick

Well, great news and a little bad news. The unit boots and passes all self tests. Bad news is the knob is broken, it'll click to select but I think the encoders are toast in it, since if I manually

Looking to source some 892X series ( except the 8922) Spectrum Analyzer modules ...dead or alive. the part numbers I have are 08920-61026 08920-61101 08920-61852 There may be other part numbers? so

Short update, after replacing the CPU and a couple other logic chips the unit boots up to bootloader and of course the corrupted ROM cause I did find on flash chips not passing power to the next one

So far the caps are reading okay, idk if it's my tester or not but all rear .5ohm. Honestly I'm not too familiar with the properties of tantalum caps. I'm still trying to figure out the Q1-Q4 and CR1

Re: [HP8920/8935 Family] Agilent 8920b non-recoverable error #hp8920b Hello, Wednesday, October 18, 2023, 22:45:17, Nathan wrote: So far the tants seem okay, no shorted ones (or close thereto), some I

So far the tants seem okay, no shorted ones (or close thereto), some I removed and tested with a capacitor tester. I think I found what I needed for Q1-Q4 and CR1 so hopefully that fixes some things.

Hi Nathan, Don't forget the capacitors. They have a shorter MTBF than chips. These sets are getting old, and even tantalums are failing. Best regards Bill M.