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Hi The battery is the same on the 8921A and the 8920A. As you mention it is on the board that the I/O Card Slot is on. The battery on my models retain the settings for all the options and sub-routines

The battery backs up anything in the memory that you program in.? It does not backup anything critical. It would be similar to when the unit was first sold with an exception of the clock where you

I have a fully functional HP8920B and some time ago I bought a replacement lithium battery for the controller board which I have not installed. Questions: 1). What exactly does this battery back up

I asked the same question a while ago, but the thread took a quick turn to the 8920b with pcmcia cards.? 8920b cards can be programmed by plugging them into adapters or laptops that have that

Hello everyone, my name is Enrico and I am a happy owner of an HP8920A. I have read that some of you have managed to use the RFTOOL SW on this machine. I wanted to know? how they had managed to

Hi Wallace, Thanks for your message and suggestion. It's a very interesting blog and I've checked the listing but sadly he doesn't list the parts or modules I need. I have sourced some from a supplier

Hi Bill, Thank you for your suggestion. I'll have a look as it might be a useful device to have anyway. The diodes are in pairs in 2 x 4-pin SMD packages so should be closely matched I would have

I do not know your HP part number But this fellow has a lot of real HP and Tek parts and is priced very reasonably I did buy a couple unobtanium low leakage diodes from him. Just Recently.They were

Hi Frank, Just a suggestion on this quest. I just bought a Cheap Chinese Transistor tester that does ESR and Resistor, Capacitors and Diodes off Ebay. When testing a diode, it gives extra information

Update 2nd Dec. Further investigation has revealed the +10V rail is supplied from the Aux +12V rail not the main +12V, so I've changed the feed and now getting +/-10V on pins 23 and 24 of J7

Hello All, It's my first posting on here, although I've used other of the groups.io forums and find they are great. I've got an 8924C which had been working fine, then one day when I turned it on

you have to have Option 4 which is the signalling feature ...you can buy the board and add it without too much hassle ....there is firmware on the board which may need to match the unit you are

Is there a way to get the 8920 to send dtmf tones?

I just fixed my second power supply replacing that cap.? All the files with pictures and procedures are in the files section. Pat

Thanks to all for your help. Looked up the suggested file, and that was the problem. Replaced the cap and everything is back in operation. Mike, WA9FDO

You can try this attached PDF for starters. Ralph ku4pt

Replace the electrolytic capacitors with high current 105 degree C or better. 73 Glenn WB4UIV

There was a document floating around ...should be in the files section ...on repairing the 8924 power supply. basically a thousand screws later there is a small cap on the daughter board inside the

Rick at Amtronix (do a Google search) has helped me in the past with this issue. I highly recommend him and I am not associated with him or his busines. Just another happy customer. On Thu, Nov 17,