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Thanks for the information. There are indeed flash memory on the controller board and empty ROM sockets on the memory board. The controller board is marked 08920-60195. It's apparently not the

Please, I need of diagram (schematic) of HP 8924. thanks

I just saw I finger messed up the model it is a 8924C And I changed the battery so any other help would be app Thanks

Hello, I have a 8921C that when starts up I get a ROM Checksum Error. Any thoughts? I ordered a new battery to replace the old one. Any other thoughts?? Thanks Nick

Yes, it has been working well for a several years. Is there any reliable source of the firmware? /Magnus

Found a bit more info. Seems the later A7 card will work with either onboard FLASH (8920B) or PROM on A8 Robert G8RPI.

on the 8920B the operating firmware is in the flash memory on the processor card and not on the? memory card. The 8920B memory card does have a PCMCIA slot and typically the eight PROM sockets are

The program memory is not on the Controller (CPU, DCU) card A7, it's on the memory card A8. An A8 card from a 8922x won't work properly in a 8920B as it does not have a PCMCIA card slot. Faulty memory

did that unit ever work correctly with that processor board ? If so I would try to re-install the firmware for the 8920B ..latest is 6.01 IIRC? ?Takes a specific SRAM card. It could be one of the

I have a HP8920B that doesn't boot properly. Most of the time nothing more happens than the fan starts and some LEDs on the boards turns on. Eventually it starts and runs normally after a couple power

Checking in - Thanks, Mike

Strangely I can't even correct a typo (quit when I meant quiet) in the title of my own message -- sometimes you are allowed to do that; can't figure out when or why -- so I'll change it this way,

It's been quiet for a month now.? Would like to see some posting before January comes to a close. If you post just change the title to something that describes better what you're posting about.? ?

Thanks Robert. You should add your additional information about the batteries to the part I wrote. The battery I used was the exact same type so I did not have to research it. The battery is made in

Nice work. One thing to be careful about with these 2/3AA 3 pin PCB mount cells is that there are two polarity conventions. The 3V cells as used in the 8924C has the two pins as positive. The 3.6V

I re-worked Ralph's great job, with a few edits and additions, into a PDF file. /g/HP8924-Family-Spectrum-Analyzers/files/HP%208924C%20Memory%20Backup%20Battery%20Replacement.pdf

That was a typo or something like that on my part Bob.? ?You are correct and Hank and I have been in contact and we worked it out.? I think he is going to correct it in the file for me.? Probably

Bob, Yes, that was a typo in the file which I just happened to have noticed earlier today.? Until I heard from Ralph, the file was edited to remove any reference to a D-K part number. Ralph bought

Digi key has the P278-ND battery as a 1.5 volt AAA size. Are you sure you did not mean a P270-ND, which is a non rechargeable BR-2/3 Lithium 3 volt cell? 73, Bob, WX2NJ (Amateur)

I have sent a short file and some pictures of my battery replacement of the 8924C battery replacement. Thanks to the ones that responded for where the battery is located. The moderator should feel