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hello to all the group

i have this problem with hp8920b , VOLTMETER SELF CALIBRATION FAILED. ERROR = 223, 0X000035f5. can anyone tell me which board to look at that causes this anomaly?? ?on the manuals is not mentioned anywhere this type of failure 0x000035f5

photo attached

thanks to those who can help me.

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.
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Regards,

?
Box

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 beep and then black screen at the moment I cannot do anything at all for the reason that I have not installed the GBIP and therefore do not have the RS232 available.

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?

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Regards,

?
Box

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 then for the A19 I was investigating but now I have to try to get it out of the coma and then you will see the file attached to my email would be the best once I've tried it I'll say how it went.?

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 28C.
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Regards,

?
Box

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Regards,

?
Box

On Mon, Aug 8, 2022 at 02:14 PM, alfonso 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 beep and then black screen at the moment I cannot do anything at all for the reason that I have not installed the GBIP and therefore do not have the RS232 available.

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

?
Box

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 myself. i don't have much spare parts available, in the meantime (time permitting) i'm studying the A19 diagram

regards.

I have seen 2 causes for this type of fault.

1. 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 replace all electrolytic caps in the power supply with equivalent value 105C types. For any fault in 8920, 8921, 8922, 8924, E8285A, 8935(E6380/E6381)? you should first check power supply and output of any regulator board - sometimes separate to power supply.
2. Faulty A19 Measurement unit - refer to 8920 CLIP for full circuit of the measurement unit.

On Tue, Aug 9, 2022 at 05:34 PM, zl1cvd wrote:

I have seen 2 causes for this type of fault.

1. 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 replace all electrolytic caps in the power supply with equivalent value 105C types. For any fault in 8920, 8921, 8922, 8924, E8285A, 8935(E6380/E6381)? you should first check power supply and output of any regulator board - sometimes separate to power supply.
2. Faulty A19 Measurement unit - refer to 8920 CLIP for full circuit of the measurement unit.

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 loss, or other problems.?
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Regards,

?
Box

On Tue, Aug 9, 2022 at 06:00 PM, @DonBox wrote:

On Tue, Aug 9, 2022 at 05:34 PM, zl1cvd wrote:

I have seen 2 causes for this type of fault.

1. 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 replace all electrolytic caps in the power supply with equivalent value 105C types. For any fault in 8920, 8921, 8922, 8924, E8285A, 8935(E6380/E6381)? you should first check power supply and output of any regulator board - sometimes separate to power supply.
2. Faulty A19 Measurement unit - refer to 8920 CLIP for full circuit of the measurement unit.

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 loss, or other problems.?
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Regards,

?
Box

8920A/B and 8921A Test Set Assembly Level Repair (.pdf 13.86 MB)
669 pages

?
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Regards,

?
Box

thanks for the info but unfortunately my power supply put on another 8920 works correctly (at least when I tested it a while ago) now I also have other problems and, perhaps because of me. I am angry with myself.

On Wed, Aug 10, 2022 at 06:28 AM, alfonso wrote:

thanks for the info but unfortunately my power supply put on another 8920 works correctly (at least when I tested it a while ago) now I also have other problems and, perhaps because of me. I am angry with myself.

10/08/2022 02:34, zl1cvd wrote:

I have seen 2 causes for this type of fault.

1. 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 replace all electrolytic caps in the power supply with equivalent value 105C types. For any fault in 8920, 8921, 8922, 8924, E8285A, 8935(E6380/E6381)? you should first check power supply and output of any regulator board - sometimes separate to power supply.
2. Faulty A19 Measurement unit - refer to 8920 CLIP for full circuit of the measurement unit.

ERROR 223 error is not caused by the power supply PSU, it should be caused by the failure of the A19 board. You can try to replace A19 to troubleshoot, and the failure of A19 is likely to cause the A7 board to fail as well.
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Regards,

?
Box