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Has anyone who has recently rebuilt the HP 8935 power supply compiled a list of the capacitors? Preferably with DigiKey or Mouser part numbers? I need to rebuild mine and from pictures on the web it

http://www.amtronix.com/repair.htm "If you have an HP 8920 unit in need of repair and calibration, we're your guys. With over 20 years experience and some 2000 repairs, we have the experience to

Steve how is their pricing compared to Amtronix for cal svcs? 73, Tim KB2MFS

I'd vote for Amtronix. Rick Bowman at Amtronix knows the 8920/8921/8924/8935 family very well and has many spare parts on-hand. The 8920B that I bought from him developed a problem, so I shipped it

If you don't think you are up to the task, it would be worth a call to Amtronix. 73, Tim KB2MFS

I use auburn metrology in bowling green ky? ?they do a good job on mine Steve Flory W9KOP sflory@... "I like climbing towers because people look up to me"

Depends entirely on the value you place on your time. As the years pass more of those projects fail pass the test. Lol Good luck! Colin G4CWH. (8920 owner, living with its frailties.)

My HP8921A is sick. I believe there are problems with the input module.? The internal diagnostics tell me there are problems with the "antenna input detector" (it reads high when it should be zero),

Hank, A few additional comments that may be of interest to others: Digi-Key was the only major vendor that could supply the parts at this time. I was able to stick with 105C on all electrolytics, but

Paul, Great news.? I thought there would be a happy ending to this story. I've been meaning to ask you what has been going on with the few replacement caps you'd said weren't too good of a fit.

Just posting an update for the archives... I replaced 29 capacitors on the power supply board: 28 electrolytic and one tantalum. Also replaced primary and secondary memory backup batteries as

Hank and group, I am back to it after a day and a half digging out from the blizzard. I've spent the last several hours working on this. After correcting a couple of mistakes on lead spacing I am

One thing that may show up the bad capacitor or capacitors is if you can get the supply where you can apply heat to the capacitors as you turn it on.? It does not always work, but heating the

Re: [HP8920/8935 Family] E8285A power supply Hello, . Sunday, January 30, 2022, 0:31:03, Sgc1823 wrote: I've got an 8921 (analog cellular and lmr) that had similar issues. I noticed it began to take

Paul, As Chris said, newer caps are almost always smaller, sometimes by substantial amounts. Could you give an example or two of a specific cap where you can't find a replacement because of size?? By

Thanks. If you only fixed 2 of 5 with caps that doesn't sound very promising. I assume the +12V STBY LED should at least be on? Mine isn't, so I'm guessing that means at least one problem with the

I have read in the group archive some recommendations to replace all the caps. I have already pulled the supply and have the main board here on the bench. I have been able to read the value on all but

Be aware the fan rpm sensors are used in E8285A. If a fault exists in fan/s, the PSU will not turn on. Only 2 out of 5 E8285A power supplies I have repaired worked by simple recapping. I never managed

I've got an 8921 (analog cellular and lmr) that had similar issues. I noticed it began to take longer to start. Push the switch and nothing happens for a while, then it started up and ran fine. It got

I have read about that vertical board. There are five small vertical boards on the main power supply board of the 8285 but I don't know if any of them is the equivalent. I was thinking of recapping