Re: HP 8920A Firmware Upgrade Issue
Update...
First off, thanks Rick for those files. They match the files that I used to program the eproms.?
I removed the hardware down to the CPU, memory and CRT controller as suggested (but forgot to disconnect the Input module). Same non-recoverable error as before, with write protect ON or OFF and with full or partial SRAM boards. Messages included "battery backed ram initialized, STD ram not maintained", "cal checksum incorrect, reset to default" and finally "non-recoverable firmware error" as before. The LED error codes indicated serial bus communication failures for all assemblies listed in the table along with A6 Signal Source/Analyzer failure.?
So that's it for now unless I can get my hands on another CPU board to try. I will run 9.15 FW til then.?
Thanks for your help,
Greg
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Re: HP 8920A Firmware Upgrade Issue
Sure,
?? Here attached are the 14.14 files from a chipmax programmer (6
total) Rick
On 5/4/2023 3:15 PM, wgwl via groups.io
wrote:
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Hi, Rick. Could you email me the A.14.14 firmware
files??
Thanks,
Greg
-------- Original message --------
Date: 3/30/23 5:56 AM (GMT-06:00)
Subject: Re: [HP8920/8935 Family] HP 8920A Firmware Upgrade
Issue
Hi Rick,
I used a BP Microsystems BP-1148 to program (6)
TC574000D IC's. Perhaps those images are mislabeled. If you
could email the files that would be great.?
Many thanks,?
Greg
-------- Original message --------
Date: 3/29/23 1:57 PM (GMT-06:00)
Subject: Re: [HP8920/8935 Family] HP 8920A Firmware Upgrade
Issue
Hi Greg,
??? What are you using to program the (6) memory IC's? We use
an EE Tools -Chipmax programmer. I could email you the files if
needed. Rick
On 3/28/2023 7:03 PM, wgwl via
groups.io wrote:
Has anyone performed a successful
firmware upgrade of an HP8920A using the Rev A.14.14 eeprom
images located in the files section of [email protected]?
I have tried and get a non-recoverable firmware error message on
power up. When I go back to the original version, 6.11, no
problem.?
?
Greg
WB9TRO?
?
?
?
?
?
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Re: HP 8920A Firmware Upgrade Issue
Hi, Rick. Could you email me the A.14.14 firmware files??
Thanks, Greg
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Show quoted text
-------- Original message -------- From: "wgwl via groups.io" <wgwl@...> Date: 3/30/23 5:56 AM (GMT-06:00) Subject: Re: [HP8920/8935 Family] HP 8920A Firmware Upgrade Issue
Hi Rick,
I used a BP Microsystems BP-1148 to program (6) TC574000D IC's. Perhaps those images are mislabeled. If you could email the files that would be great.?
Many thanks,? Greg
-------- Original message -------- From: rab@... Date: 3/29/23 1:57 PM (GMT-06:00) Subject: Re: [HP8920/8935 Family] HP 8920A Firmware Upgrade Issue
Hi Greg,
??? What are you using to program the (6) memory IC's? We use an
EE Tools -Chipmax programmer. I could email you the files if
needed. Rick
On 3/28/2023 7:03 PM, wgwl via
groups.io wrote:
Has anyone performed a successful firmware upgrade of an HP8920A
using the Rev A.14.14 eeprom images located in the files section
of [email protected]? I have tried and get a
non-recoverable firmware error message on power up. When I go back
to the original version, 6.11, no problem.?
?
Greg
WB9TRO?
?
?
?
?
?
|
Re: HP8924C outer case screw size?
#hp8924c
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Hi Casey, I have all that hardware. If you contact rick at
amtronix instruments (lab4@...)? - I can ship the
hardware to you. ? rick
On 5/2/2023 10:21 PM, Casey Crane
wrote:
I recently re-acquired my old HP8924C from a friend's estate who
passed a couple of years ago. When I found it the device would not
power on and all the outer case and inner power supply case screws
were missing along with the side handles. I have no idea where he
placed them. I was able to repair it tonight using the power
supply capacitor replacement guide but I'm not seeing a manual in
the files that references the hardware but I'm probably missing
it. The outer case screws appear to be 3mm but does anyone know
for sure? Also, if anyone has any handles they want to get rid of
please contact me. Thanks.
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Re: HP8924C outer case screw size?
#hp8924c
Hi Casey, I have all that hardware. If you contact rick at
amtronix instruments (lab4@...)? - I can ship the
hardware to you. ? rick
On 5/2/2023 10:21 PM, Casey Crane
wrote:
toggle quoted message
Show quoted text
I recently re-acquired my old HP8924C from a friend's estate who
passed a couple of years ago. When I found it the device would not
power on and all the outer case and inner power supply case screws
were missing along with the side handles. I have no idea where he
placed them. I was able to repair it tonight using the power
supply capacitor replacement guide but I'm not seeing a manual in
the files that references the hardware but I'm probably missing
it. The outer case screws appear to be 3mm but does anyone know
for sure? Also, if anyone has any handles they want to get rid of
please contact me. Thanks.
|
I recently re-acquired my old HP8924C from a friend's estate who passed a couple of years ago. When I found it the device would not power on and all the outer case and inner power supply case screws were missing along with the side handles. I have no idea where he placed them. I was able to repair it tonight using the power supply capacitor replacement guide but I'm not seeing a manual in the files that references the hardware but I'm probably missing it. The outer case screws appear to be 3mm but does anyone know for sure? Also, if anyone has any handles they want to get rid of please contact me. Thanks.
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Hello to all,
If anyone is interested I am selling my CRT display that was just removed from my 8920B a couple weeks ago.
It has a crisp, clean display with no issues at all.
No excessive screen burn.
Asking $145 which includes shipping in the lower 48 US- I am open to offers! :-)
Display will be encased in protective foam to prevent damage during shipping.
Please contact direct,
Alex, KD6VPH
Olympia, WA
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Re: 8920A Memory Overflow
Long story short... I think that you got it right.
I swapped some stuff around including a firmware board with the extra memory and everything is working now.
Thanks so much for the help!!
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Re: HP 8920A/B, 8921A LCD/VGA Out
On Sat, Apr 29, 2023 at 04:34 PM, Steve Flory wrote:
W9KOP
This looks terrific. Is there a link showing how to do this? Thanks Dave KA6BFB
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Re: HP 8920A/B, 8921A LCD/VGA Out
Steve Flory W9KOP
sflory@...
"I like climbing towers because people look up to me"
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HP 8920A/B, 8921A LCD/VGA Out
Hello to the group, I know the LCD conversion is nothing new for the 892x series. I recently, thanks to member "DCFluX" mentioning this, added external VGA out the back of my 8920B. I wanted to share to others that if you want to use the 0.1" header on the LCD board and not wire directly to the terminals here's the part numbers for the connectors and pins. I also cut the #2 ground pin and inserted a block in the female connector to add polarization of the connector to avoid "oops" in the future. TE Connectivity 12-Pin Female Connector? p/n: 87456-7 TE Connectivity Female Pins p/n: 87667-3 I then cut a VGA panel mount cable made by Cables2Go p/n: 52096 and took the HP 8920B blank cover plate off the "Option Interface" on the rear of the 8920B and cut/filed/sanded a place to mount the VGA connector to so it looked factory. The VGA cable barely fits through the LCD/CRT cable port. I do need to find a native 640x480 monitor now to complete the setup. The 8920B is by far my most favorite test equipment that I have ever used. -Alex, KD6VPH    
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Re: HP 8920B #hp8920b various questions
#hp8920b
? I’m about to clear the bench and undertake the task of repairing/replacing caps in the PS of my 8920A. Someday, maybe Rick will get the opportunity to turn it into a “B” model. ?? tnx Mike / K5JR? Alpharetta GA
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On Apr 21, 2023, at 9:09 PM, opelgtalex <aszuski@...> wrote: ?Thank you for the info Rick, greatly appreciated!
I managed to score a soft carry case for my 8920B for free from a friend, also renewed all the caps in the power supply, and new memory battery.
I posted in the files section the list of caps for the PS- I know there are many on here that have re-capped these I just wanted to capture it should it help someone down the road.
I did renew all of the electrolytic's the 8920B PS because unlike the IFR 500/1200/1500/A-7550 power supplies of which I have recapped many, getting the PCB off the barbed standoffs was not fun, nor was it fun attempting to, and chickening out of, removing the power switch rod - I ended up leaving it attached and securing it to the PCB with polyamide tape.
The new LCD/TFT display is fantastic, made this unit really enjoyable to use- waiting on parts to install a VGA feed out the back from the LCD board.
Alex
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Re: HP 8920B #hp8920b various questions
#hp8920b
Thank you for the info Rick, greatly appreciated!
I managed to score a soft carry case for my 8920B for free from a friend, also renewed all the caps in the power supply, and new memory battery.
I posted in the files section the list of caps for the PS- I know there are many on here that have re-capped these I just wanted to capture it should it help someone down the road.
I did renew all of the electrolytic's the 8920B PS because unlike the IFR 500/1200/1500/A-7550 power supplies of which I have recapped many, getting the PCB off the barbed standoffs was not fun, nor was it fun attempting to, and chickening out of, removing the power switch rod - I ended up leaving it attached and securing it to the PCB with polyamide tape.
The new LCD/TFT display is fantastic, made this unit really enjoyable to use- waiting on parts to install a VGA feed out the back from the LCD board.
Alex
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Thank you Rick, much appreciated. While trying to analyze the circuit, I concluded that was part of the start circuitry and replaced it first up. Unfortunately it wasn't the problem.
I'll try the heat trick, I'd forgot about that, it might show something.
I'm guessing circuit diagrams are not available.
Cheers
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File /Agilent HP 8920A 8920B 8921A Power Supply Capacitor Renewal/Agilent HP 8920A_B 8921A Power Supply Capacitor Renewal.pdf uploaded
#file-notice
The following files and folders have been uploaded to the Files area of the [email protected] group.
By: opelgtalex <aszuski@...>
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Rick -
Is that the same power supply that is used in the 8924?
John K
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Dave,
?? That "daughter" board is near the middle of the rear most
power supply board. It's NOT the board with the (2) potentometers.
rick
On 4/20/2023 9:46 PM, Dave Downie via
groups.io wrote:
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I posted this in another group and it was suggested I post it
here.
I have a HP 8935 that I’ve used for a while with no issues. Turned
it on recently and it shows no signs of life - nothing.
I’ve done some preliminary checks - there is AC to the main board
(so not GFI) / bridge rectifier, but after that the circuit is
hard to follow.
Does anyone have a circuit diagram of the power supply? Or known
common issues with this model?
I've replaced quite a few caps, removed and tested FETs, voltage
regulators, transistors etc but haven't found anything faulty.
Thanks
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Hi Dave,? Look for a 47uf/ 35V radial capacitor on a "daughter
board" that is on the board closest to the rear of the 8935. That
is usually the problem. A good test to see if that's the problem
is to warm up the rear of the 8935 with a hair dryer and see if it
will then come to life. That is a further indication that cap
going bad. rick
On 4/20/2023 9:46 PM, Dave Downie via
groups.io wrote:
toggle quoted message
Show quoted text
I posted this in another group and it was suggested I post it
here.
I have a HP 8935 that I’ve used for a while with no issues. Turned
it on recently and it shows no signs of life - nothing.
I’ve done some preliminary checks - there is AC to the main board
(so not GFI) / bridge rectifier, but after that the circuit is
hard to follow.
Does anyone have a circuit diagram of the power supply? Or known
common issues with this model?
I've replaced quite a few caps, removed and tested FETs, voltage
regulators, transistors etc but haven't found anything faulty.
Thanks
|
I posted this in another group and it was suggested I post it here.
I have a HP 8935 that I’ve used for a while with no issues. Turned it on recently and it shows no signs of life - nothing.
I’ve done some preliminary checks - there is AC to the main board (so not GFI) / bridge rectifier, but after that the circuit is hard to follow.
Does anyone have a circuit diagram of the power supply? Or known common issues with this model?
I've replaced quite a few caps, removed and tested FETs, voltage regulators, transistors etc but haven't found anything faulty.
Thanks
|
Re: HP 8920A Firmware Upgrade Issue
Update...
14.14 FW still will not boot (non-recoverable firmware error) even with S1 in the non-protected position.
My eprom programmer, a BP1148, seems to have no problem converting Intel hex to binary.
I have provided checksums of the images in hopes that you guys can verify their validity using images that you use. This will tell me two things: That my programmer is handling the hex to binary conversion correctly and that the eprom labels are correct. Unlikely that's the problem because these images have been used before.?
The 8 bit checksums of the binary images are as follows
U18 - 2A010C1
U19 - 1F1AD0D
U20 - 2700853
U21 - 1F7BECF
U22 - 206E375
U23 - 1CFD80E
Again, the machine boots with 9.15 FW (passes self test) with the exception of a "cal file checksum error. File reset to default values" message. Any idea what could be causing that? It doesn't seem to matter whether write protect is on or off. Also, the cal EEPROM data has not changed from my initial backup copy. This message disappears when I reinstall the original 6.11 FW.
That's all for now. Thanks for your help.
Greg
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opelgtalex