Mark yes the display was normal.
|
All LEDs should go off once boot is complete and the initial hardware check is finished. ?D13 being left on indicates there is a problem with the 68230 (U57) Parallel Interface/Timer. ?See Table 14-3 in the Assembly Repair manual for LED decoding.
?
It doesn't necessarily mean that U57 is bad; it could be something that's being tested that is connected to U57.
?
I assume you had a normal display before you replaced the battery? ?Is the SRAM card completely seated?
?
-mark
?
?
On Thu, Apr 3, 2025 at 07:58 PM, KB2LMN wrote:
Ok I replaced the battery this am and all went great, yes I did copy the info as the manual states.
my new issue is the display as you will see in this video. I thought maybe I missed a connection when I re-assembled so I took all apart and checked and nothing was disconnected or wrong.
?
?
The Voltages look good according to the Power Supply indicator lights.
?
D1 - D16 all lite when powered on and go off with the exception on D13 as I believe this is normal?
?
Any suggestions would be appreciated.?
|
Hi, ? I think you may have lost the calibration constants, at least the ones related to the display. ? You'll have to do a blind test. The soft buttons near the screen, the top one is #1 and the bottom one is #6. ? CAL MORE (soft button #6) Soft button #4 for vertical adjustment Soft button #5 for horizontal adjustment ? Use the knob or the up and down arrows to see if you can synchronize the image. ? ? Yves
|
Ok I replaced the battery this am and all went great, yes I did copy the info as the manual states.
my new issue is the display as you will see in this video. I thought maybe I missed a connection when I re-assembled so I took all apart and checked and nothing was disconnected or wrong.
?
?
The Voltages look good according to the Power Supply indicator lights.
?
D1 - D16 all lite when powered on and go off with the exception on D13 as I believe this is normal?
?
Any suggestions would be appreciated.?
|
Hi Jeff. I feel your pain. And FYI, the power supply is a pain to work on. The PCB is held by a number of plastic stand-off type things that you have to squeeze closed and work the board out. But if you go this route, Q1 is a likely suspect.
?
I have attached the schematic of the power supply, at least this is what I have seen in the 8920's I've worked on.
?
Good luck!
?
Mark
?
|
Re: HP 8594E battery power
Yes, the RTC is on the processor board and gets power through the connector to the SRAM board where the battery is located.? When the SRAM card is removed, you lose the time.
?
Regardless of the super-cap and any other optional external battery backup steps, I would also recommend going through the calibration constants backup procedure described in the Assembly-Level Repair manual, chpt. 3.? It only take s a few minutes to write down the constants.? If you make a mistake with the battery, your future self will thank you.
?
It's also possible to record and recover the cal constants from the output of the GPIB command "CAL DUMP", if you have a PC with a GPIB interface.
?
-mark
?
?
On Thu, Apr 3, 2025 at 06:01 PM, Ozan wrote:
On Thu, Apr 3, 2025 at 10:24 AM, KB2LMN wrote:
Anyplace to attach an outside power supply so data doesn’t need to be re-entered when replacing battery??
Andrew
?
====
I assume you already found service manual sheet with all the data to be copied to paper for insurance. There is a super capacitor on the battery board, if it is still good it lasts long enough to desolder/solder the battery. For extra safety you can solder a parallel 3V battery with 10k-ohm in series. I think date/time is kept on a different board and it will be lost so don't be concerned if you see date to be wrong after battery change.
?
Ozan
?
|
Re: HP 8594E battery power
On Thu, Apr 3, 2025 at 10:24 AM, KB2LMN wrote:
Anyplace to attach an outside power supply so data doesn’t need to be re-entered when replacing battery??
Andrew
?
====
I assume you already found service manual sheet with all the data to be copied to paper for insurance. There is a super capacitor on the battery board, if it is still good it lasts long enough to desolder/solder the battery. For extra safety you can solder a parallel 3V battery with 10k-ohm in series. I think date/time is kept on a different board and it will be lost so don't be concerned if you see date to be wrong after battery change.
?
Ozan
?
|
HP8935 displaying AA Memory Battey Low Message
Friends,
?
My HP8935 is displaying the AA Memory Battey Low message, but the batteries are not low.? I am wondering if anyone else has experienced this.
?
Thanks!
Jeff KC8VFN
|
This morning, I tried running it using a DC power supply and that led to it blowing the 15 Amp external fuse for DC power.? As I mentioned yesterday, if you try to use on AC, it blows the external 5 Amp AC fuse.? I have never had the cover off, but that is the decision I need to make now.? Send it off or have a go at myself.? I have a well-equipped lab but am not sure about a schematic for the power supply.? I will need to look for one.? I won't work on much of anything without one.? From what I've seen in response to my inquiries, it seems like Q1 is a possibility.? Will it be a SMD?? I have some SMD rework equipment, but not a ton of experience with it.? I normally work on Ham Radio Equipment, mostly repeaters, not HP test equipment.? Recommendations welcome.?
?
Thanks!
Jeff
|
HP 8505A OP Manual and Digital Radio Measurements
Sold the VNA, however, have the local ops manual, very handy with?
full view foldout. Also, Digital Radio Measurements text.?
?
PM me direct, make offer, shipped media mail.?
?
Thanks, Alan?
|
Re: Manuals for an HP3456B DMM?
I am not certain it is a 3456B. I got that number from a phone conversation from someone selling a pair of these meters, and a recollection from seeing said meters at a hamfest last year. I will be getting them soon, and will update when I have them in front of me.
?
BobH
?
|
Anyplace to attach an outside power supply so data doesn’t need to be re-entered when replacing battery??
Andrew
|
Re: Manuals for an HP3456B DMM?
FWIW, I can't put my hands on my '94 catalog at the moment, but the 3456A is no longer in the '95 one - it has the 3457A & 3458A. -Pat
?
> ------ Original Message ------
> From: kc0wjn@...
> To: [email protected]
> Sent: Thursday, April 3rd 2025, 11:18 AM
> Subject: Re: [HP-Agilent-Keysight-equipment] Manuals for an HP3456B DMM?
? And your attempt worked. Thanks.
? ?
?
Dave Daniel suggested that he maybe should scan and make
a pdf out of his HP3456<<<A>>> manual.? I was trying to head
that off.
I looked in the following catalogs:
1986 - 3456A
1987 - 3456A
1988 - 3456A
1989 - 3456A
1990 - 3456A
1991 - 3456A
1992 - 3456A
1993 - 3456A
...
1997 - no 3456 model number in catalog
...
1999 - no 3456 model number in catalog
2000 -?
So, if the "B" model exists, it would be in 1994, 1995, or 1996.
The 3458A was the only meter in the 34XX series in 1999.
Searching for HP3456B results in a couple of ChatGPT created
results that don't actually contain 3456"B".
Although the OP hasn't chimed in, I would bet he made a mistake.
I am pretty certain that no 3456B ever existed as a DVM.
-Chuck Harris
On Thu, 3 Apr 2025 05:20:16 -0700 "Radu Bogdan Dicher via "
<vondicher=[email protected]> wrote:
> I've never heard of a 3456B. I don't think there is one. It'd be very
> interesting to learn if that's not so.
>?
> Radu.
>?
> On Thu, Apr 3, 2025, 3:43 AM Chuck Harris via <cfharris=
> [email protected]> wrote:
>?
> > Nice copies of the various HP3456A manuals are available
> > on Ko4bb.com
> >
> > -Chuck Harris
> >
> >
> > On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via "
> > <kc0wjn=[email protected]> wrote:
> > > Yes. There was a time when a 3458A was on my list of expensive
> > > instruments to acquire for my lab, but I ended up with the 3456A
> > > as an interim solution and it has fulfilled my needs. I wish I
> > > could find a replacement for the small aluminum panel on the RH
> > > side on which the binding posts are mounted because mine is badly
> > > and deeply scratched, but tha's a nit.
> > >
> > > It sounds as if i should scan my 3456A manual and upload a copy of
> > > the PDF to the HP Wiki. I an in the process of scanning a
> > > Tektronix 7934 manual (the foldouts are tedious to properly
> > > scan), so the 3456A manual scan would be queued behind that.
> > >
> > > Everyone should own an HP 345xA, a Fluke 27 and af least one
> > > Simpson 260, lol.
> > >
> > > DaveD
> > > KC0WJN
> > >
> > >
> > > On Wed, Apr 2, 2025 at 22:54 Dave McGuire via <mcguire=
> > > [email protected]> wrote:
> > >
> > > > On 4/2/25 22:48, Dave Daniel via wrote:
> > > > > They made 3455s, 3456s, 3457s and 3458s. I think but am not
> > > > > sure that these were all "A" models, i.e., 3456A. My
> > > > > understanding is that the 3458A is the (or one of) gold
> > > > > standard(s).
> > > >
> > > >? ? The 3458A is indeed the gold standard, and one of the few
> > > > instruments to be made with all three names on the front.
> > > >
> > > > > I own a 3456A.
> > > >
> > > >? ? They are great meters, even (especially?) by today's
> > > > standards.
> > > >
> > > >? ? ? ? ? ? ? ?-Dave
> > > >
> > > > --
> > > > Dave McGuire, AK4HZ
> > > > New Kensington, PA
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >?
> >
> >
> >
>?
>?
>?
>?
>?
?
|
Re: Manuals for an HP3456B DMM?
And your attempt worked. Thanks.
Dave Daniel suggested that he maybe should scan and make
a pdf out of his HP3456<<<A>>> manual.? I was trying to head
that off.
I looked in the following catalogs:
1986 - 3456A
1987 - 3456A
1988 - 3456A
1989 - 3456A
1990 - 3456A
1991 - 3456A
1992 - 3456A
1993 - 3456A
...
1997 - no 3456 model number in catalog
...
1999 - no 3456 model number in catalog
2000 -
So, if the "B" model exists, it would be in 1994, 1995, or 1996.
The 3458A was the only meter in the 34XX series in 1999.
Searching for HP3456B results in a couple of ChatGPT created
results that don't actually contain 3456"B".
Although the OP hasn't chimed in, I would bet he made a mistake.
I am pretty certain that no 3456B ever existed as a DVM.
-Chuck Harris
On Thu, 3 Apr 2025 05:20:16 -0700 "Radu Bogdan Dicher via "
<vondicher=[email protected]> wrote:
> I've never heard of a 3456B. I don't think there is one. It'd be very
> interesting to learn if that's not so.
>
> Radu.
>
> On Thu, Apr 3, 2025, 3:43 AM Chuck Harris via <cfharris=
> [email protected]> wrote:
>
> > Nice copies of the various HP3456A manuals are available
> > on Ko4bb.com
> >
> > -Chuck Harris
> >
> >
> > On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via "
> > <kc0wjn=[email protected]> wrote:
> > > Yes. There was a time when a 3458A was on my list of expensive
> > > instruments to acquire for my lab, but I ended up with the 3456A
> > > as an interim solution and it has fulfilled my needs. I wish I
> > > could find a replacement for the small aluminum panel on the RH
> > > side on which the binding posts are mounted because mine is badly
> > > and deeply scratched, but tha's a nit.
> > >
> > > It sounds as if i should scan my 3456A manual and upload a copy of
> > > the PDF to the HP Wiki. I an in the process of scanning a
> > > Tektronix 7934 manual (the foldouts are tedious to properly
> > > scan), so the 3456A manual scan would be queued behind that.
> > >
> > > Everyone should own an HP 345xA, a Fluke 27 and af least one
> > > Simpson 260, lol.
> > >
> > > DaveD
> > > KC0WJN
> > >
> > >
> > > On Wed, Apr 2, 2025 at 22:54 Dave McGuire via <mcguire=
> > > [email protected]> wrote:
> > >
> > > > On 4/2/25 22:48, Dave Daniel via wrote:
> > > > > They made 3455s, 3456s, 3457s and 3458s. I think but am not
> > > > > sure that these were all "A" models, i.e., 3456A. My
> > > > > understanding is that the 3458A is the (or one of) gold
> > > > > standard(s).
> > > >
> > > >? ? The 3458A is indeed the gold standard, and one of the few
> > > > instruments to be made with all three names on the front.
> > > >
> > > > > I own a 3456A.
> > > >
> > > >? ? They are great meters, even (especially?) by today's
> > > > standards.
> > > >
> > > >? ? ? ? ? ? ? ?-Dave
> > > >
> > > > --
> > > > Dave McGuire, AK4HZ
> > > > New Kensington, PA
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
|
Re: Manuals for an HP3456B DMM?
Yes, after I posted I looked around and found several good-quality copies. I did that backwards!
Nice copies of the various HP3456A manuals are available
on Ko4bb.com
-Chuck Harris
On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via "
<kc0wjn=[email protected]> wrote:
> Yes. There was a time when a 3458A was on my list of expensive
> instruments to acquire for my lab, but I ended up with the 3456A as
> an interim solution and it has fulfilled my needs. I wish I could
> find a replacement for the small aluminum panel on the RH side on
> which the binding posts are mounted because mine is badly and deeply
> scratched, but tha's a nit.
>
> It sounds as if i should scan my 3456A manual and upload a copy of
> the PDF to the HP Wiki. I an in the process of scanning a Tektronix
> 7934 manual (the foldouts are tedious to properly scan), so the 3456A
> manual scan would be queued behind that.
>
> Everyone should own an HP 345xA, a Fluke 27 and af least one Simpson
> 260, lol.
>
> DaveD
> KC0WJN
>
>
> On Wed, Apr 2, 2025 at 22:54 Dave McGuire via <mcguire=
> [email protected]> wrote:
>
> > On 4/2/25 22:48, Dave Daniel via wrote:
> > > They made 3455s, 3456s, 3457s and 3458s. I think but am not sure
> > > that these were all "A" models, i.e., 3456A. My understanding is
> > > that the 3458A is the (or one of) gold standard(s).
> >
> >? ? The 3458A is indeed the gold standard, and one of the few
> > instruments to be made with all three names on the front.
> >
> > > I own a 3456A.
> >
> >? ? They are great meters, even (especially?) by today's standards.
> >
> >? ? ? ? ? ? ? ?-Dave
> >
> > --
> > Dave McGuire, AK4HZ
> > New Kensington, PA
> >
> >
> >
> >
> >
> >
>
>
>
>
>
|
Re: Manuals for an HP3456B DMM?
Dave Daniel suggested that he maybe should scan and make a pdf out of his HP3456<<<A>>> manual. I was trying to head that off. I looked in the following catalogs: 1986 - 3456A 1987 - 3456A 1988 - 3456A 1989 - 3456A 1990 - 3456A 1991 - 3456A 1992 - 3456A 1993 - 3456A ... 1997 - no 3456 model number in catalog ... 1999 - no 3456 model number in catalog 2000 - So, if the "B" model exists, it would be in 1994, 1995, or 1996. The 3458A was the only meter in the 34XX series in 1999. Searching for HP3456B results in a couple of ChatGPT created results that don't actually contain 3456"B". Although the OP hasn't chimed in, I would bet he made a mistake. I am pretty certain that no 3456B ever existed as a DVM. -Chuck Harris On Thu, 3 Apr 2025 05:20:16 -0700 "Radu Bogdan Dicher via groups.io" <vondicher@...> wrote: I've never heard of a 3456B. I don't think there is one. It'd be very
interesting to learn if that's not so.
Radu.
On Thu, Apr 3, 2025, 3:43 AM Chuck Harris via groups.io <cfharris=
[email protected]> wrote:
Nice copies of the various HP3456A manuals are available
on Ko4bb.com
-Chuck Harris
On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via groups.io"
<kc0wjn@...> wrote:
Yes. There was a time when a 3458A was on my list of expensive
instruments to acquire for my lab, but I ended up with the 3456A
as an interim solution and it has fulfilled my needs. I wish I
could find a replacement for the small aluminum panel on the RH
side on which the binding posts are mounted because mine is badly
and deeply scratched, but tha's a nit.
It sounds as if i should scan my 3456A manual and upload a copy of
the PDF to the HP Wiki. I an in the process of scanning a
Tektronix 7934 manual (the foldouts are tedious to properly
scan), so the 3456A manual scan would be queued behind that.
Everyone should own an HP 345xA, a Fluke 27 and af least one
Simpson 260, lol.
DaveD
KC0WJN
On Wed, Apr 2, 2025 at 22:54 Dave McGuire via groups.io <mcguire=
[email protected]> wrote:
On 4/2/25 22:48, Dave Daniel via groups.io wrote:
They made 3455s, 3456s, 3457s and 3458s. I think but am not
sure that these were all "A" models, i.e., 3456A. My
understanding is that the 3458A is the (or one of) gold
standard(s). The 3458A is indeed the gold standard, and one of the few
instruments to be made with all three names on the front.
I own a 3456A. They are great meters, even (especially?) by today's
standards.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: Manuals for an HP3456B DMM?
I've never heard of a 3456B. I don't think there is one. It'd be very interesting to learn if that's not so.
Radu.
Nice copies of the various HP3456A manuals are available
on Ko4bb.com
-Chuck Harris
On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via "
<kc0wjn=[email protected]> wrote:
> Yes. There was a time when a 3458A was on my list of expensive
> instruments to acquire for my lab, but I ended up with the 3456A as
> an interim solution and it has fulfilled my needs. I wish I could
> find a replacement for the small aluminum panel on the RH side on
> which the binding posts are mounted because mine is badly and deeply
> scratched, but tha's a nit.
>
> It sounds as if i should scan my 3456A manual and upload a copy of
> the PDF to the HP Wiki. I an in the process of scanning a Tektronix
> 7934 manual (the foldouts are tedious to properly scan), so the 3456A
> manual scan would be queued behind that.
>
> Everyone should own an HP 345xA, a Fluke 27 and af least one Simpson
> 260, lol.
>
> DaveD
> KC0WJN
>
>
> On Wed, Apr 2, 2025 at 22:54 Dave McGuire via <mcguire=
> [email protected]> wrote:
>
> > On 4/2/25 22:48, Dave Daniel via wrote:
> > > They made 3455s, 3456s, 3457s and 3458s. I think but am not sure
> > > that these were all "A" models, i.e., 3456A. My understanding is
> > > that the 3458A is the (or one of) gold standard(s).
> >
> >? ? The 3458A is indeed the gold standard, and one of the few
> > instruments to be made with all three names on the front.
> >
> > > I own a 3456A.
> >
> >? ? They are great meters, even (especially?) by today's standards.
> >
> >? ? ? ? ? ? ? ?-Dave
> >
> > --
> > Dave McGuire, AK4HZ
> > New Kensington, PA
> >
> >
> >
> >
> >
> >
>
>
>
>
>
|
You have a failed power supply/ Almost certainly the main switch Q1 a MOSFET. This can also take out the feedback transformer T2 which is a PITA. You can ty DC input, see /g/HP-Agilent-Keysight-equipment/message/151023 for the connector detail, its the same on SA and 8920x. Better to use 24V if you have it the current is high at 12V. If it doesn't run on DC it is probably Q1. The DC input runs a DC-DC converter with high voltage DC output. If it runs on DC it is likely the mains bridge rectifier. A failed Rifa is possible but unlikely as they self heal and you can't miss the smell.... Join the 8920 group too /g/HP8924-Family-Spectrum-Analyzers/topics?
Robert.
|
Re: Manuals for an HP3456B DMM?
Nice copies of the various HP3456A manuals are available on Ko4bb.com -Chuck Harris On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via groups.io" <kc0wjn@...> wrote: Yes. There was a time when a 3458A was on my list of expensive
instruments to acquire for my lab, but I ended up with the 3456A as
an interim solution and it has fulfilled my needs. I wish I could
find a replacement for the small aluminum panel on the RH side on
which the binding posts are mounted because mine is badly and deeply
scratched, but tha's a nit.
It sounds as if i should scan my 3456A manual and upload a copy of
the PDF to the HP Wiki. I an in the process of scanning a Tektronix
7934 manual (the foldouts are tedious to properly scan), so the 3456A
manual scan would be queued behind that.
Everyone should own an HP 345xA, a Fluke 27 and af least one Simpson
260, lol.
DaveD
KC0WJN
On Wed, Apr 2, 2025 at 22:54 Dave McGuire via groups.io <mcguire=
[email protected]> wrote:
On 4/2/25 22:48, Dave Daniel via groups.io wrote:
They made 3455s, 3456s, 3457s and 3458s. I think but am not sure
that these were all "A" models, i.e., 3456A. My understanding is
that the 3458A is the (or one of) gold standard(s). The 3458A is indeed the gold standard, and one of the few
instruments to be made with all three names on the front.
I own a 3456A. They are great meters, even (especially?) by today's standards.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: RF Alignment Failure in Agilent CXA signal analyzer N9000A
Hi Are the Cal signal at w9 ok-about -25 ?—if so I guess you have the same fault we have seen in the MXA series-bad switch at Rf Front end.. Regards Hardy ? ? I have Agilent CXA Signal Analyzer N9000A, I'm getting these errors, please help. I referred manual and it suggested to check 50Mhz with -24dB, But when I check in my equipment its showing 50Mhz with -60dB. While I trace it out it was across H270(HMC270MS8G) where I was getting 50Mhz with -60dB but near FPGA it is exact 50Mhz with -24dB, so does it represent there is problem with H270 or any other if yes please help me, And any blue print of this will help a-lot.
|
KB2LMN
Cubdriver