Empathy List Archives

NR

Norman Reitz

Fri, Nov 12, 2021 5:57 PM

Hi,
I hope someone here can help. I want to setup a HP 3048a phase noise measurement Set. So I bought the HP 3561a an the interface. After testing the HP3561a I hat two error Codes: #0 7-26 and #0 7-31. Does someone got the servicemanual for further Informations?
Thx and Kind regards Norman

Hi, I hope someone here can help. I want to setup a HP 3048a phase noise measurement Set. So I bought the HP 3561a an the interface. After testing the HP3561a I hat two error Codes: #0 7-26 and #0 7-31. Does someone got the servicemanual for further Informations? Thx and Kind regards Norman

DR

Dan Rae

Fri, Nov 12, 2021 7:24 PM

On 11/12/2021 9:57 AM, Norman Reitz via time-nuts wrote:

Hi,
I hope someone here can help. I want to setup a HP 3048a phase noise measurement Set. So I bought the HP 3561a an the interface. After testing the HP3561a I hat two error Codes: #0 7-26 and #0 7-31. Does someone got the servicemanual for further Informations?
Thx and Kind regards Norman

Norman, those are RAM error codes, Pages 6-59 to 6-61 in volume 1 of the
service manual refer to these. There are other codes on the screen that
will tell you exactly which IC has died. Artek has the manual.

I've had two with similar faults, replacing the IC indicated cured them.

Dan

On 11/12/2021 9:57 AM, Norman Reitz via time-nuts wrote: > Hi, > I hope someone here can help. I want to setup a HP 3048a phase noise measurement Set. So I bought the HP 3561a an the interface. After testing the HP3561a I hat two error Codes: #0 7-26 and #0 7-31. Does someone got the servicemanual for further Informations? > Thx and Kind regards Norman Norman, those are RAM error codes, Pages 6-59 to 6-61 in volume 1 of the service manual refer to these. There are other codes on the screen that will tell you exactly which IC has died. Artek has the manual. I've had two with similar faults, replacing the IC indicated cured them. Dan

NR

Norman Reitz

Fri, Nov 12, 2021 7:41 PM

Hi Dan,
Thank you very much for your very fast reply. First time for me to repair a measurement device. I hope my knowledge is enought. I will try to get v1 were you told me. Its good to Herr that its probably not the End of my short time with the HP3561a.
Best regards
Norman

Gesendet von Yahoo Mail auf Android

Am Fr., Nov. 12, 2021 at 20:25 schrieb Dan Rae via time-nutstime-nuts@lists.febo.com: On 11/12/2021 9:57 AM, Norman Reitz via time-nuts wrote:

Hi,
I hope someone here can help. I want to setup a HP 3048a phase noise measurement Set. So I bought the HP 3561a an the interface. After testing the HP3561a I hat two error Codes: #0 7-26 and #0 7-31. Does someone got the servicemanual for further Informations?
Thx and Kind regards Norman

Norman, those are RAM error codes, Pages 6-59 to 6-61 in volume 1 of the
service manual refer to these. There are other codes on the screen that
will tell you exactly which IC has died. Artek has the manual.

I've had two with similar faults, replacing the IC indicated cured them.

Dan

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

Hi Dan, Thank you very much for your very fast reply. First time for me to repair a measurement device. I hope my knowledge is enought. I will try to get v1 were you told me. Its good to Herr that its probably not the End of my short time with the HP3561a. Best regards Norman Gesendet von Yahoo Mail auf Android Am Fr., Nov. 12, 2021 at 20:25 schrieb Dan Rae via time-nuts<time-nuts@lists.febo.com>: On 11/12/2021 9:57 AM, Norman Reitz via time-nuts wrote: > Hi, > I hope someone here can help. I want to setup a HP 3048a phase noise measurement Set. So I bought the HP 3561a an the interface. After testing the HP3561a I hat two error Codes: #0 7-26 and #0 7-31. Does someone got the servicemanual for further Informations? > Thx and Kind regards Norman Norman, those are RAM error codes, Pages 6-59 to 6-61 in volume 1 of the service manual refer to these. There are other codes on the screen that will tell you exactly which IC has died. Artek has the manual. I've had two with similar faults, replacing the IC indicated cured them. Dan _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

CS

Charles Steinmetz

Fri, Nov 12, 2021 8:48 PM

Norman wrote:

Does someone got the servicemanual for further Informations?

Norman, you do not need to pay for the manuals. They are posted at:

http://www.ko4bb.com/getsimple/index.php?id=manuals

Search for "hp 3561a" (do not type the quotation marks).

Best regards,

Charles

Norman wrote: > Does someone got the servicemanual for further Informations? Norman, you do not need to pay for the manuals. They are posted at: <http://www.ko4bb.com/getsimple/index.php?id=manuals> Search for "hp 3561a" (do not type the quotation marks). Best regards, Charles

NR

Norman Reitz

Fri, Nov 12, 2021 10:09 PM

Hello Charles,
I found it. A lot of stuff to read first. Thx a lot. I think, I am going to open the HP3561a tomorrow. I am still hoping, maybe only a connection is a bit damaged during transportation. I got no Information about a dedicated Rom on the Screen. Maybe I hope it cant get contact to the entire Rom.
I dont want to send it back.there are not that much 3561a on the market. Without it the hp3048a is not complete. And I defnetly want to be able to measure phasenoise from -100 to -130dbc @10hz...were my fsiq7 is not be able to.
Thank you very much for your very nice welcome in this mailing list.
Best regards
Norman

Because I am New here, I dont know, If picture are allowed.i attached the booting screen

Gesendet von Yahoo Mail auf Android

Am Fr., Nov. 12, 2021 at 21:49 schrieb Charles Steinmetzcsteinmetz@yandex.com: Norman wrote:

Does someone got the servicemanual for further Informations?

Norman, you do not need to pay for the manuals. They are posted at:

http://www.ko4bb.com/getsimple/index.php?id=manuals

Search for "hp 3561a" (do not type the quotation marks).

Best regards,

Charles

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

Hello Charles, I found it. A lot of stuff to read first. Thx a lot. I think, I am going to open the HP3561a tomorrow. I am still hoping, maybe only a connection is a bit damaged during transportation. I got no Information about a dedicated Rom on the Screen. Maybe I hope it cant get contact to the entire Rom. I dont want to send it back.there are not that much 3561a on the market. Without it the hp3048a is not complete. And I defnetly want to be able to measure phasenoise from -100 to -130dbc @10hz...were my fsiq7 is not be able to. Thank you very much for your very nice welcome in this mailing list. Best regards Norman Because I am New here, I dont know, If picture are allowed.i attached the booting screen Gesendet von Yahoo Mail auf Android Am Fr., Nov. 12, 2021 at 21:49 schrieb Charles Steinmetz<csteinmetz@yandex.com>: Norman wrote: > Does someone got the servicemanual for further Informations? Norman, you do not need to pay for the manuals. They are posted at: <http://www.ko4bb.com/getsimple/index.php?id=manuals> Search for "hp 3561a" (do not type the quotation marks). Best regards, Charles _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

DR

Dan Rae

Sat, Nov 13, 2021 5:27 AM

Norman,

From the code 0 7 26, if there is just one faulty RAM IC you will see
down the bottom of the screen a RAM hex number from 0 to F. On page 6-59
in Volume 1 you will find a list of the IC numbers that correspond to
those RAM numbers. However since you seem to have an additional Error
Code 31 and the full list of RAM numbers displayed it is likely to be
more than a simple one IC failure. 31 indicates RAM refresh test error,
if that means anything to you, I'm a bit lost frankly. It might be
worth checking the board connections...

Good luck!

Dan

Norman, From the code 0 7 26, if there is just one faulty RAM IC you will see down the bottom of the screen a RAM hex number from 0 to F. On page 6-59 in Volume 1 you will find a list of the IC numbers that correspond to those RAM numbers. However since you seem to have an additional Error Code 31 and the full list of RAM numbers displayed it is likely to be more than a simple one IC failure. 31 indicates RAM refresh test error, if that means anything to you, I'm a bit lost frankly. It might be worth checking the board connections... Good luck! Dan

NR

Norman Reitz

Sat, Nov 13, 2021 11:42 AM

Hello !
Working 🙂🙃🙂🙃
I opened the device and am really impressed with the quality of the construction. 30 years old, no gram of dust! It looks like it has just left HP 😍. I have cleaned the contacts of all boards and want to briefly show you the result. I will use the service instructions to calibrate the device. The first milestone has been achieved. More luck than sense again. Many greetings and many thanks for your help.
Norman

Gesendet von Yahoo Mail auf Android

Am Sa., Nov. 13, 2021 at 6:27 schrieb Dan Rae via time-nutstime-nuts@lists.febo.com: Norman,

From the code 0 7 26, if there is just one faulty RAM IC you will see
down the bottom of the screen a RAM hex number from 0 to F. On page 6-59
in Volume 1 you will find a list of the IC numbers that correspond to
those RAM numbers. However since you seem to have an additional Error
Code 31 and the full list of RAM numbers displayed it is likely to be
more than a simple one IC failure. 31 indicates RAM refresh test error,
if that means anything to you, I'm a bit lost frankly. It might be
worth checking the board connections...

Good luck!

Dan

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

Hello ! Working 🙂🙃🙂🙃 I opened the device and am really impressed with the quality of the construction. 30 years old, no gram of dust! It looks like it has just left HP 😍. I have cleaned the contacts of all boards and want to briefly show you the result. I will use the service instructions to calibrate the device. The first milestone has been achieved. More luck than sense again. Many greetings and many thanks for your help. Norman Gesendet von Yahoo Mail auf Android Am Sa., Nov. 13, 2021 at 6:27 schrieb Dan Rae via time-nuts<time-nuts@lists.febo.com>: Norman, From the code 0 7 26, if there is just one faulty RAM IC you will see down the bottom of the screen a RAM hex number from 0 to F. On page 6-59 in Volume 1 you will find a list of the IC numbers that correspond to those RAM numbers. However since you seem to have an additional Error Code 31 and the full list of RAM numbers displayed it is likely to be more than a simple one IC failure. 31 indicates RAM refresh test error, if that means anything to you, I'm a bit lost frankly. It might be worth checking the board connections... Good luck! Dan _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

JH

Jim Harman

Sat, Nov 13, 2021 1:14 PM

If you are getting RAM refresh errors with a device of that vintage, check
the power supplies that feed the RAM chips. In those days, there was a
second supply voltage (-12V?) that was used only for refreshing the data.

On Sat, Nov 13, 2021 at 12:27 AM Dan Rae via time-nuts <
time-nuts@lists.febo.com> wrote:

Norman,

From the code 0 7 26, if there is just one faulty RAM IC you will see
down the bottom of the screen a RAM hex number from 0 to F. On page 6-59
in Volume 1 you will find a list of the IC numbers that correspond to
those RAM numbers. However since you seem to have an additional Error
Code 31 and the full list of RAM numbers displayed it is likely to be
more than a simple one IC failure. 31 indicates RAM refresh test error,
if that means anything to you, I'm a bit lost frankly. It might be
worth checking the board connections...

Good luck!

Dan

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send
an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

--

--Jim Harman

If you are getting RAM refresh errors with a device of that vintage, check the power supplies that feed the RAM chips. In those days, there was a second supply voltage (-12V?) that was used only for refreshing the data. On Sat, Nov 13, 2021 at 12:27 AM Dan Rae via time-nuts < time-nuts@lists.febo.com> wrote: > Norman, > > From the code 0 7 26, if there is just one faulty RAM IC you will see > down the bottom of the screen a RAM hex number from 0 to F. On page 6-59 > in Volume 1 you will find a list of the IC numbers that correspond to > those RAM numbers. However since you seem to have an additional Error > Code 31 and the full list of RAM numbers displayed it is likely to be > more than a simple one IC failure. 31 indicates RAM refresh test error, > if that means anything to you, I'm a bit lost frankly. It might be > worth checking the board connections... > > Good luck! > > Dan > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send > an email to time-nuts-leave@lists.febo.com > To unsubscribe, go to and follow the instructions there. -- --Jim Harman

R(

Richard (Rick) Karlquist

Sat, Nov 13, 2021 4:46 PM

I was working for HP in 1983 at the division that produced the 3561.
In those days everyone had "terminals" that were used to remotely
log in to shared computers. These terminals had a bunch of PC
cards with gold plated edge-card connectors. It was SOP that
one's terminal would stop working periodically, and the fix was
to simply unplug all the boards and then reseat them. This
almost always worked.

If you got nearly 40 years out of your connectors without a
problem, you did well. I too have a vintage 3561 that still
works fine.

Rick N6RK

On 11/13/2021 3:42 AM, Norman Reitz via time-nuts wrote:

Hello !
Working 🙂🙃🙂🙃
I opened the device and am really impressed with the quality of the construction. 30 years old, no gram of dust! It looks like it has just left HP 😍. I have cleaned the contacts of all boards and want to briefly show you the result. I will use the service instructions to calibrate the device. The first milestone has been achieved. More luck than sense again. Many greetings and many thanks for your help.
Norman

Gesendet von Yahoo Mail auf Android

Am Sa., Nov. 13, 2021 at 6:27 schrieb Dan Rae via time-nuts<time-nuts@lists.febo.com>:   Norman,

From the code 0 7 26, if there is just one faulty RAM IC you will see
down the bottom of the screen a RAM hex number from 0 to F. On page 6-59
in Volume 1 you will find a list of the IC numbers that correspond to
those RAM numbers. However since you seem to have an additional Error
Code 31 and the full list of RAM numbers displayed it is likely to be
more than a simple one IC failure. 31 indicates RAM refresh test error,
if that means anything to you, I'm a bit lost frankly. It might be
worth checking the board connections...

Good luck!

Dan

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

I was working for HP in 1983 at the division that produced the 3561. In those days everyone had "terminals" that were used to remotely log in to shared computers. These terminals had a bunch of PC cards with gold plated edge-card connectors. It was SOP that one's terminal would stop working periodically, and the fix was to simply unplug all the boards and then reseat them. This almost always worked. If you got nearly 40 years out of your connectors without a problem, you did well. I too have a vintage 3561 that still works fine. Rick N6RK On 11/13/2021 3:42 AM, Norman Reitz via time-nuts wrote: > Hello ! > Working 🙂🙃🙂🙃 > I opened the device and am really impressed with the quality of the construction. 30 years old, no gram of dust! It looks like it has just left HP 😍. I have cleaned the contacts of all boards and want to briefly show you the result. I will use the service instructions to calibrate the device. The first milestone has been achieved. More luck than sense again. Many greetings and many thanks for your help. > Norman > > > > Gesendet von Yahoo Mail auf Android > > Am Sa., Nov. 13, 2021 at 6:27 schrieb Dan Rae via time-nuts<time-nuts@lists.febo.com>: Norman, > > From the code 0 7 26, if there is just one faulty RAM IC you will see > down the bottom of the screen a RAM hex number from 0 to F. On page 6-59 > in Volume 1 you will find a list of the IC numbers that correspond to > those RAM numbers. However since you seem to have an additional Error > Code 31 and the full list of RAM numbers displayed it is likely to be > more than a simple one IC failure. 31 indicates RAM refresh test error, > if that means anything to you, I'm a bit lost frankly. It might be > worth checking the board connections... > > Good luck! > > Dan > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com > To unsubscribe, go to and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com > To unsubscribe, go to and follow the instructions there. >

LV

Lester Veenstra

Fri, Jan 27, 2023 4:31 PM

Agree, but I will point out ARTEK does very high quality work, particularly
if you need better resolution schematics.

Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG
CTM1)
lester@veenstras.com

452 Stable Ln
Keyser WV 26726 USA

GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)

Telephones:
Home:            +1-304-289-6057
US cell          +1-304-790-9192
Jamaica cell:   +1-876-456-8898

-----Original Message-----
From: Charles Steinmetz [mailto:csteinmetz@yandex.com]
Sent: Friday, November 12, 2021 3:49 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Re: HP 3561a Service Manual

Norman wrote:

Does someone got the servicemanual for further Informations?

Norman, you do not need to pay for the manuals. They are posted at:

http://www.ko4bb.com/getsimple/index.php?id=manuals

Search for "hp 3561a" (do not type the quotation marks).

Best regards,

Charles

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an
email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

Agree, but I will point out ARTEK does very high quality work, particularly if you need better resolution schematics. Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1) lester@veenstras.com 452 Stable Ln Keyser WV 26726 USA GPS: 39.336826 N 78.982287 W (Google) GPS: 39.33682 N 78.9823741 W (GPSDO) Telephones: Home: +1-304-289-6057 US cell +1-304-790-9192 Jamaica cell: +1-876-456-8898 -----Original Message----- From: Charles Steinmetz [mailto:csteinmetz@yandex.com] Sent: Friday, November 12, 2021 3:49 PM To: time-nuts@lists.febo.com Subject: [time-nuts] Re: HP 3561a Service Manual Norman wrote: > Does someone got the servicemanual for further Informations? Norman, you do not need to pay for the manuals. They are posted at: <http://www.ko4bb.com/getsimple/index.php?id=manuals> Search for "hp 3561a" (do not type the quotation marks). Best regards, Charles _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.