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*Thank you for your reply and suggestions.* *Power supply on the electrolytic capacitors I have replaced all, A19 on the J1 detection point +5v and -5v are normal, currently suspected of A19 data

I have seen 2 causes for this type of fault. * Faulty power supply - check all power rails are the correct voltages. These units all suffer from dry / cracked caps in power supply. The cure is to

ok thank you i hope you can solve it as soon as possible i can't do anything about it now, as soon as i have the .bin file i'll upload it to the new eepromm and test it unfortunately i have to do it

This phenomenon, which I have also encountered, seems to be that certain motherboards are not plugged in properly. -- Regards, Box

-- Regards, Box

Now I can't operate anything except I can move the cursor when I turn on the computer. So after I fix ERROR 223 (A19 board), if I can operate normally, I can try to download the BIN file of A7 board

ok it doesn't matter to me, I've bought a new 28c and would like to try programming it with a definitely working .bin file to see what happens if it's not a problem for you it would be appreciated

Sorry, mine is 8920A, I don't know if the 28C of 8920A can be used on 8920B. I bought a faulty 8920A, no response to boot up, after troubleshooting, it was determined that the problem was on the A7,

excuse me, do you have a chance to make a copy of the 8920b's 28c memory in .bin format that has the calibration data in your possession for me to test? 08/08/2022 17:12, donbox@... wrote:

hello, no I have not corrected the error, but I have kept the instrument switched off for a long time and now it only does the boot. and, all the lights remain on the A7 board, you only hear the boot

hi I'm having the same problem as you and no response to any keystrokes. Did you fix this ERROR? Can you give me some advice. -- Regards, Box

I agree about the 8920 not keeping the OCXO powered. It does come with a down side. The little switcher that does this failed in my 8924C, and I had to pretty much completely disassemble it to repair

No modulation - It is not uncommon to walk 1 hz at a time as it warms up with averaging off, but flip back and forth then solid.? I normally enter frequency manually so it's in Freq Error mode. If

The 8924C keeps the OCXO warmed up as long as it is plugged in. I ignore the last digit, maybe even the last 2. Even reading the output of a GPSDO, which is pretty stable, my 8924C jumps 1 number up

Do the reading on an unmodulated FQ signal with no DPL.? Tone PL doesn't seem to be so bad. AVG should be at 5 to start, more than 10 and I am waiting.? You can also enable the bar graph and set the

Use the Blue shift button and then the AVG botton.? Use the keypad and enter a number such as 10 or 20. The higher the number, the more delay in the updating. To clear the AVG function use the blue

If you are reading the frequency of an FM transmitter, this is normal - its frequency changes with modulation. If you are reading a non-modulated signal, and it's substantially higher than the noise,

I'm not sure if this works on the frequency reading but on the other ones there is the ability to average the gauge. If you highlight the units with the cursor as I recall the was an average key that

When reading a transmitter's frequency, the last few digits jump around so much it is hard to determine what is real.? Is there a setting to normalize or smooth that so I can warp it onto frequency?

Now I can confirm that the problem is on the A7DCU motherboard. I used 8922 motherboard installed on it and was able to boot up.