Thank you, Patricio, and thank you very much, Tom. Hopefully, my PS repair gets reflected soon in a fully functional unit.? I'm a bit disheartened, but I do very much appreciate your encouragement! Radu.?
On Sat, Sep 17, 2022 at 9:43 PM Radu Dicher < vondicher@...> wrote: Bruce, Thank you for pitching in.?
Yes, upon restarting the unit, it goes to 1MHz and -86.98dBm amplitude,?which I think is default. Everything display-wise seems perfect. Except maybe the issue of no?buffer time to?allow the LO to reach temperature, which I find odd. Maybe the LO is offline? Which may explain no sinewave at output.?
I reconnected by hand the rigid line. Not sure if properly, as I don't have a brass-torqued SMD wrench. I assume the worst that can happen with that is a non-leveled output, but not missing altogether. Not knowing more on the history of the unit, I assume maybe my handling of the shielded modules may have severed the signal path somehow. Though I generally?have a very soft and?overly planned touch, if anything, so maybe the history of the unit is the issue. I dunno.?
I will be looking into examining the signal path for any potential interruptions. Given the history of the unit I tend to think it should come back online?within spec,?but that's not what we're seeing here.? Radu.?
On Sat, Sep 17, 2022 at 9:25 PM Bruce < bruce@...> wrote: Do you know at power up the output is ~ -80dBm - try setting the?
amplatude to 0dBm and be sure you reconnected the hardline from the RF?
unit to the attenuator.? Any front panel diagnostics lit ???
Cheers!
Bruce
Quoting Tom Lee <tomlee@...>:
> Great news, indeed. Keep going, Radu!
>
> -- Cheers,
> Tom
>
> --
> Prof. Thomas H. Lee
> Allen Ctr., Rm. 205
> 350 Jane Stanford Way
> Stanford University
> Stanford, CA 94305-4070
>
>
> On 9/17/2022 20:27, Radu Bogdan Dicher wrote:
>> Great news, folks.
>>
>> After finding out both A15CR1 and CR2 were shorted, I replaced them?
>> with 1N4003s, and all rails are now coming online in spec?(while?
>> having the board out, I also replaced all 10uF caps). Now the?+15V?
>> is just a hair off at 14.987V (should be within 0.01V of 15V), but?
>> I can't imagine that's a huge deal.
>>
>> However, I don't seem to see any signal coming out of it. Learning?
>> how to use it, so take that with a grain of salt.
>> Radu.
>>
>> On Sat, Sep 17, 2022 at 6:54 PM Radu Bogdan Dicher via ?
>> <> <vondicher=[email protected]> wrote:
>>
>>? ? Well, after finally taking this apart (I'd post pictures, but I am
>>? ? a bit ptsd'ed...) I have two shorted diodes on A15 - CR1 and CR2.
>>? ? I am thinking vanilla 1N4148 would be OK in this position - thoughts?
>>? ? Thank you,
>>? ? Radu.
>>
>>? ? On Sat, Sep 17, 2022 at 5:30 PM Radu Bogdan Dicher via
>>? ? <> <vondicher=[email protected]> wrote:
>>
>>? ? ? ? Raymond, Clay,
>>? ? ? ? You both sort of got beat by a hair with the 4 youtube videos
>>? ? ? ? Clay is talking about. Must be this:
>>? ? ? ? .
>>
>>? ? ? ? And yes, I take back my statement on the overall assembly
>>? ? ? ? design of this unit. I didn't know there's just one SMA
>>? ? ? ? connecting?the shielded modules (there's actually several in
>>? ? ? ? my unit as to, I think, the youtube sample, but they're not
>>? ? ? ? rigid lines), but overall, it's a breeze to take apart (once
>>? ? ? ? you know what the correct path is).
>>
>>? ? ? ? Thank you both! On to the work for me.
>>? ? ? ? Radu.
>>
>>? ? ? ? On Sat, Sep 17, 2022 at 4:42 PM Raymond Domp Frank
>>? ? ? ? <hewpatek@...> wrote:
>>
>>? ? ? ? ? ? On Sun, Sep 18, 2022 at 01:22 AM, freshndaire wrote:
>>
>>? ? ? ? ? ? ? ? I would not call this unit hard to service or a poor
>>? ? ? ? ? ? ? ? mechanical design.? Pull the big aluminum hunk and you
>>? ? ? ? ? ? ? ? have lots of access!? The synthesizer module has 3
>>? ? ? ? ? ? ? ? long bolts holding it in.? Remove the SMA Semi-rigid
>>? ? ? ? ? ? ? ? coax cable from the module's backplane then pull the 3
>>? ? ? ? ? ? ? ? screws in the middle and you can lift the synth module
>>? ? ? ? ? ? ? ? and set it aside with the other cables plugged in IIRC.
>>
>>? ? ? ? ? ? So my memory served me right!
>>
>>? ? ? ? ? ? Raymond
>
>
>
|
Re: Pozidriv screws on HP covers
On 9/17/22 22:23, saipan59 (Pete) wrote: Torx and square drive are the kings of readily available
high torque screws
Question: Is Torx and "star drive" the same thing? Perhaps the only difference is that Torx is trademarked?? Yes. Look at the people who call Torx "star drive" with the same derision as you would the people who equate Phillips, PoziDriv, and JIS and call them all "crosspoints". -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Bruce, Thank you for pitching in.?
Yes, upon restarting the unit, it goes to 1MHz and -86.98dBm amplitude,?which I think is default. Everything display-wise seems perfect. Except maybe the issue of no?buffer time to?allow the LO to reach temperature, which I find odd. Maybe the LO is offline? Which may explain no sinewave at output.?
I reconnected by hand the rigid line. Not sure if properly, as I don't have a brass-torqued SMD wrench. I assume the worst that can happen with that is a non-leveled output, but not missing altogether. Not knowing more on the history of the unit, I assume maybe my handling of the shielded modules may have severed the signal path somehow. Though I generally?have a very soft and?overly planned touch, if anything, so maybe the history of the unit is the issue. I dunno.?
I will be looking into examining the signal path for any potential interruptions. Given the history of the unit I tend to think it should come back online?within spec,?but that's not what we're seeing here.? Radu.?
On Sat, Sep 17, 2022 at 9:25 PM Bruce < bruce@...> wrote: Do you know at power up the output is ~ -80dBm - try setting the?
amplatude to 0dBm and be sure you reconnected the hardline from the RF?
unit to the attenuator.? Any front panel diagnostics lit ???
Cheers!
Bruce
Quoting Tom Lee <tomlee@...>:
> Great news, indeed. Keep going, Radu!
>
> -- Cheers,
> Tom
>
> --
> Prof. Thomas H. Lee
> Allen Ctr., Rm. 205
> 350 Jane Stanford Way
> Stanford University
> Stanford, CA 94305-4070
>
>
> On 9/17/2022 20:27, Radu Bogdan Dicher wrote:
>> Great news, folks.
>>
>> After finding out both A15CR1 and CR2 were shorted, I replaced them?
>> with 1N4003s, and all rails are now coming online in spec?(while?
>> having the board out, I also replaced all 10uF caps). Now the?+15V?
>> is just a hair off at 14.987V (should be within 0.01V of 15V), but?
>> I can't imagine that's a huge deal.
>>
>> However, I don't seem to see any signal coming out of it. Learning?
>> how to use it, so take that with a grain of salt.
>> Radu.
>>
>> On Sat, Sep 17, 2022 at 6:54 PM Radu Bogdan Dicher via ?
>> <> <vondicher=[email protected]> wrote:
>>
>>? ? Well, after finally taking this apart (I'd post pictures, but I am
>>? ? a bit ptsd'ed...) I have two shorted diodes on A15 - CR1 and CR2.
>>? ? I am thinking vanilla 1N4148 would be OK in this position - thoughts?
>>? ? Thank you,
>>? ? Radu.
>>
>>? ? On Sat, Sep 17, 2022 at 5:30 PM Radu Bogdan Dicher via
>>? ? <> <vondicher=[email protected]> wrote:
>>
>>? ? ? ? Raymond, Clay,
>>? ? ? ? You both sort of got beat by a hair with the 4 youtube videos
>>? ? ? ? Clay is talking about. Must be this:
>>? ? ? ? .
>>
>>? ? ? ? And yes, I take back my statement on the overall assembly
>>? ? ? ? design of this unit. I didn't know there's just one SMA
>>? ? ? ? connecting?the shielded modules (there's actually several in
>>? ? ? ? my unit as to, I think, the youtube sample, but they're not
>>? ? ? ? rigid lines), but overall, it's a breeze to take apart (once
>>? ? ? ? you know what the correct path is).
>>
>>? ? ? ? Thank you both! On to the work for me.
>>? ? ? ? Radu.
>>
>>? ? ? ? On Sat, Sep 17, 2022 at 4:42 PM Raymond Domp Frank
>>? ? ? ? <hewpatek@...> wrote:
>>
>>? ? ? ? ? ? On Sun, Sep 18, 2022 at 01:22 AM, freshndaire wrote:
>>
>>? ? ? ? ? ? ? ? I would not call this unit hard to service or a poor
>>? ? ? ? ? ? ? ? mechanical design.? Pull the big aluminum hunk and you
>>? ? ? ? ? ? ? ? have lots of access!? The synthesizer module has 3
>>? ? ? ? ? ? ? ? long bolts holding it in.? Remove the SMA Semi-rigid
>>? ? ? ? ? ? ? ? coax cable from the module's backplane then pull the 3
>>? ? ? ? ? ? ? ? screws in the middle and you can lift the synth module
>>? ? ? ? ? ? ? ? and set it aside with the other cables plugged in IIRC.
>>
>>? ? ? ? ? ? So my memory served me right!
>>
>>? ? ? ? ? ? Raymond
>
>
>
|
Great News !!? Ing. Patricio A. GrecoTaller Aeron¨¢utico de Reparaci¨®n 1B-349Organizaci¨®n de Mantenimiento Aeron¨¢utico de la Defensa OMAD-001Gral. Mart¨ªn Rodr¨ªguez 2159San Miguel (1663)Buenos AiresT:?+5411-4455-2557F:?+5411-4032-0072
toggle quoted message
Show quoted text
On 18 Sep 2022, at 00:27, Radu Bogdan Dicher <vondicher@...> wrote:
? Great news, folks.?
After finding out both A15CR1 and CR2 were shorted, I replaced them with 1N4003s, and all rails are now coming online in spec?(while having the board out, I also replaced all 10uF caps). Now the?+15V is just a hair off at 14.987V (should be within 0.01V of 15V), but I can't imagine that's a huge deal.? However, I don't seem to see any signal coming out of it. Learning how to use it, so take that with a grain of salt.? Radu.? On Sat, Sep 17, 2022 at 6:54 PM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: Well, after finally taking this apart (I'd post pictures, but I am a bit ptsd'ed...) I have two shorted diodes on A15 - CR1 and CR2.? I am thinking vanilla 1N4148 would be OK in this position - thoughts?? Thank you, Radu.?
On Sat, Sep 17, 2022 at 5:30 PM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: Raymond, Clay, You both sort of got beat by a hair with the 4 youtube videos Clay is talking about. Must be this:?.?
And yes, I take back my statement on the overall assembly design of this unit. I didn't know there's just one SMA connecting?the shielded modules (there's actually several in my unit as to, I think, the youtube sample, but they're not rigid lines), but overall, it's a breeze to take apart (once you know what the correct path is).?
Thank you both! On to the work for me. Radu.?
On Sat, Sep 17, 2022 at 4:42 PM Raymond Domp Frank < hewpatek@...> wrote: On Sun, Sep 18, 2022 at 01:22 AM, freshndaire wrote:
I would not call this unit hard to service or a poor mechanical design.? Pull the big aluminum hunk and you have lots of access!? The synthesizer module has 3 long bolts holding it in.? Remove the SMA Semi-rigid coax cable from the module's backplane then pull the 3 screws in the middle and you can lift the synth module and set it aside with the other cables plugged in IIRC.
So my memory served me right!
Raymond
|
Re: Pozidrive screws on HP covers
Back in the '60's, while In the USAF, we knew these as "Reed and Prince" screw heads.? I've since noted the more commonly used term of Pozidriv's.? .
|
Do you know at power up the output is ~ -80dBm - try setting the amplatude to 0dBm and be sure you reconnected the hardline from the RF unit to the attenuator. Any front panel diagnostics lit ???
Cheers!
Bruce
Quoting Tom Lee <tomlee@...>:
toggle quoted message
Show quoted text
Great news, indeed. Keep going, Radu!
-- Cheers,
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
On 9/17/2022 20:27, Radu Bogdan Dicher wrote:
Great news, folks.
After finding out both A15CR1 and CR2 were shorted, I replaced them with 1N4003s, and all rails are now coming online in spec?(while having the board out, I also replaced all 10uF caps). Now the?+15V is just a hair off at 14.987V (should be within 0.01V of 15V), but I can't imagine that's a huge deal.
However, I don't seem to see any signal coming out of it. Learning how to use it, so take that with a grain of salt.
Radu.
On Sat, Sep 17, 2022 at 6:54 PM Radu Bogdan Dicher via groups.io <> <vondicher@...> wrote:
Well, after finally taking this apart (I'd post pictures, but I am
a bit ptsd'ed...) I have two shorted diodes on A15 - CR1 and CR2.
I am thinking vanilla 1N4148 would be OK in this position - thoughts?
Thank you,
Radu.
On Sat, Sep 17, 2022 at 5:30 PM Radu Bogdan Dicher via groups.io
<> <vondicher@...> wrote:
Raymond, Clay,
You both sort of got beat by a hair with the 4 youtube videos
Clay is talking about. Must be this:
.
And yes, I take back my statement on the overall assembly
design of this unit. I didn't know there's just one SMA
connecting?the shielded modules (there's actually several in
my unit as to, I think, the youtube sample, but they're not
rigid lines), but overall, it's a breeze to take apart (once
you know what the correct path is).
Thank you both! On to the work for me.
Radu.
On Sat, Sep 17, 2022 at 4:42 PM Raymond Domp Frank
<hewpatek@...> wrote:
On Sun, Sep 18, 2022 at 01:22 AM, freshndaire wrote:
I would not call this unit hard to service or a poor
mechanical design.? Pull the big aluminum hunk and you
have lots of access!? The synthesizer module has 3
long bolts holding it in.? Remove the SMA Semi-rigid
coax cable from the module's backplane then pull the 3
screws in the middle and you can lift the synth module
and set it aside with the other cables plugged in IIRC.
So my memory served me right!
Raymond
|
Great news, indeed. Keep going, Radu!
-- Cheers,
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
On 9/17/2022 20:27, Radu Bogdan Dicher
wrote:
toggle quoted message
Show quoted text
Great news, folks.?
After finding out both A15CR1 and CR2 were shorted, I
replaced them with 1N4003s, and all rails are now coming
online in spec?(while having the board out, I also replaced
all 10uF caps). Now the?+15V is just a hair off at 14.987V
(should be within 0.01V of 15V), but I can't imagine that's a
huge deal.?
However, I don't seem to see any signal coming out of
it. Learning how to use it, so take that with a grain of
salt.?
Radu.?
On Sat, Sep 17, 2022 at 6:54
PM Radu Bogdan Dicher via <vondicher= [email protected]>
wrote:
Well, after finally taking this apart (I'd post
pictures, but I am a bit ptsd'ed...) I have two shorted
diodes on A15 - CR1 and CR2.?
I am thinking vanilla 1N4148 would be OK in this
position - thoughts??
Thank you,
Radu.?
On Sat, Sep 17, 2022 at
5:30 PM Radu Bogdan Dicher via
<vondicher= [email protected]>
wrote:
Raymond, Clay,
You both sort of got beat by a hair with the 4
youtube videos Clay is talking about. Must be this:?.?
And yes, I take back my statement on the overall
assembly design of this unit. I didn't know there's
just one SMA connecting?the shielded modules (there's
actually several in my unit as to, I think, the
youtube sample, but they're not rigid lines), but
overall, it's a breeze to take apart (once you know
what the correct path is).?
Thank you both! On to the work for me.
Radu.?
On Sat, Sep 17, 2022
at 4:42 PM Raymond Domp Frank < hewpatek@...>
wrote:
On Sun, Sep 18,
2022 at 01:22 AM, freshndaire wrote:
I would not call this unit hard to service
or a poor mechanical design.? Pull the big aluminum
hunk and you have lots of access!? The synthesizer
module has 3 long bolts holding it in.? Remove the
SMA Semi-rigid coax cable from the module's
backplane then pull the 3 screws in the middle and
you can lift the synth module and set it aside with
the other cables plugged in IIRC.
So my memory served me right!
Raymond
|
Great news, folks.?
After finding out both A15CR1 and CR2 were shorted, I replaced them with 1N4003s, and all rails are now coming online in spec?(while having the board out, I also replaced all 10uF caps). Now the?+15V is just a hair off at 14.987V (should be within 0.01V of 15V), but I can't imagine that's a huge deal.? However, I don't seem to see any signal coming out of it. Learning how to use it, so take that with a grain of salt.? Radu.?
On Sat, Sep 17, 2022 at 6:54 PM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: Well, after finally taking this apart (I'd post pictures, but I am a bit ptsd'ed...) I have two shorted diodes on A15 - CR1 and CR2.? I am thinking vanilla 1N4148 would be OK in this position - thoughts?? Thank you, Radu.?
On Sat, Sep 17, 2022 at 5:30 PM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: Raymond, Clay, You both sort of got beat by a hair with the 4 youtube videos Clay is talking about. Must be this:?.?
And yes, I take back my statement on the overall assembly design of this unit. I didn't know there's just one SMA connecting?the shielded modules (there's actually several in my unit as to, I think, the youtube sample, but they're not rigid lines), but overall, it's a breeze to take apart (once you know what the correct path is).?
Thank you both! On to the work for me. Radu.?
On Sat, Sep 17, 2022 at 4:42 PM Raymond Domp Frank < hewpatek@...> wrote: On Sun, Sep 18, 2022 at 01:22 AM, freshndaire wrote:
I would not call this unit hard to service or a poor mechanical design.? Pull the big aluminum hunk and you have lots of access!? The synthesizer module has 3 long bolts holding it in.? Remove the SMA Semi-rigid coax cable from the module's backplane then pull the 3 screws in the middle and you can lift the synth module and set it aside with the other cables plugged in IIRC.
So my memory served me right!
Raymond
|
Re: Pozidrive screws on HP covers
I'm also appreciating learning?on this! I had no idea. Many thanks?to the OP.? I also found out I actually have a couple of these tips for my "fine work" bench?driver. A #1 and a #2. I used the?#2 today!? Radu.?
Here is a link to some pictures comparing Phillips and Pozidriv screwdrivers and screw heads. Photos were taken of the two types next to one another to permit easy observation of the differences between them - Phillips on the left and Pozidriv on the right in all images.
And as for working on old HP gear, best to have both Phillips AND Pozi close at hand, as over the years the PZ screws tend to become lost and are often replaced with Phillips, resulting in a mixed bag of hardware. In this instance, the two screws in the final gallery photo both came from the same instrument, which happens to have three Phillips and one Pozi holding its top cover on.. -Pat
> ------ Original Message ------
> From: vondicher@...
> To: [email protected]
> Sent: Saturday, September 17, 2022 5:40 PM
> Subject: Re: [HP-Agilent-Keysight-equipment] Pozidrive screws on HP covers
Interesting. Maybe that's why I've had such a hard time trying to avoid ruining those as frequently as I had. Do you have an image with a "pozidrive" tip? Radu.
I failed to realize, until recently, that the screws on the covers on many HP instruments are Pozidrive and not Philips.
Had I looked more carefully I would have seen the X indicator but it was only after I actually used a Pozidrive on one that I felt how much better it was! Not surprisingly it's a much better / firmer fit.
Live and learn I guess. I'll never use a Philips on one again!
|
Hello Walter,
?
I¡¯m still searching for HP parts:
¡¤????????
The hybrid for the HP 3476A, 1813-0091
¡¤????????
The winged knob for the HP 8640B Range switch.
Can you help, please?
?
Cheers, Brian, VK2GCE
?
?
Lots of tek and hp goodies added to the stuff page, reduced
the price on the Tek AA501A distortion analyzer package, added a nice HP power
meter (436A) and sensor, and many $1 and R+D items added.
There is a huge assortment of HP spare parts there, let me know if you need
something not shown, as I have thousands of HP parts we are trying to clear
out. Have lots of REAR feet for hp instruments if anybody can use them, free.
these go on large generators, counters, etc. Also have a lot of paper hp
manuals, if you will be up this way, you are welcome to stop in and look for
any you can use. not ideal for shipping, just too much weight.
walter (walter2 -at- sphere.bc.ca)
|
Re: Pozidrive screws on HP covers
Here is a link to some pictures comparing Phillips and Pozidriv screwdrivers and screw heads. Photos were taken of the two types next to one another to permit easy observation of the differences between them - Phillips on the left and Pozidriv on the right in all images.
And as for working on old HP gear, best to have both Phillips AND Pozi close at hand, as over the years the PZ screws tend to become lost and are often replaced with Phillips, resulting in a mixed bag of hardware. In this instance, the two screws in the final gallery photo both came from the same instrument, which happens to have three Phillips and one Pozi holding its top cover on.. -Pat
> ------ Original Message ------
> From: vondicher@...
> To: [email protected]
> Sent: Saturday, September 17, 2022 5:40 PM
> Subject: Re: [HP-Agilent-Keysight-equipment] Pozidrive screws on HP covers
Interesting. Maybe that's why I've had such a hard time trying to avoid ruining those as frequently as I had. Do you have an image with a "pozidrive" tip? Radu.
I failed to realize, until recently, that the screws on the covers on many HP instruments are Pozidrive and not Philips.
Had I looked more carefully I would have seen the X indicator but it was only after I actually used a Pozidrive on one that I felt how much better it was! Not surprisingly it's a much better / firmer fit.
Live and learn I guess. I'll never use a Philips on one again!
|
Re: Pozidriv screws on HP covers
On Sat, Sep 17, 2022 at 06:16 PM, Chuck Harris wrote:
Torx and square drive are the kings of readily available
high torque screws
Question: Is Torx and "star drive" the same thing? Perhaps the only difference is that Torx is trademarked?? Pete
|
Well, after finally taking this apart (I'd post pictures, but I am a bit ptsd'ed...) I have two shorted diodes on A15 - CR1 and CR2.? I am thinking vanilla 1N4148 would be OK in this position - thoughts?? Thank you, Radu.?
On Sat, Sep 17, 2022 at 5:30 PM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: Raymond, Clay, You both sort of got beat by a hair with the 4 youtube videos Clay is talking about. Must be this:?.?
And yes, I take back my statement on the overall assembly design of this unit. I didn't know there's just one SMA connecting?the shielded modules (there's actually several in my unit as to, I think, the youtube sample, but they're not rigid lines), but overall, it's a breeze to take apart (once you know what the correct path is).?
Thank you both! On to the work for me. Radu.?
On Sat, Sep 17, 2022 at 4:42 PM Raymond Domp Frank < hewpatek@...> wrote: On Sun, Sep 18, 2022 at 01:22 AM, freshndaire wrote:
I would not call this unit hard to service or a poor mechanical design.? Pull the big aluminum hunk and you have lots of access!? The synthesizer module has 3 long bolts holding it in.? Remove the SMA Semi-rigid coax cable from the module's backplane then pull the 3 screws in the middle and you can lift the synth module and set it aside with the other cables plugged in IIRC.
So my memory served me right!
Raymond
|
Re: Pozidriv screws on HP covers
FYI -square drive also
known as Robertson Drive ( named after the inventor early last
century)...great drive method!
¸é±ð²Ô¨¦±ð
On 9/17/22 5:16 PM, Chuck Harris wrote:
toggle quoted message
Show quoted text
Since nobody seems to have mentioned it, Pozidriv screws
can be identified by a cross type screw slot, with a
set of fine lines stamped in the head in between the
crossed slots (a cross and a cross...). JIS have a single
dot stamped in the head between two of the slots.
Pozidriv screw slots have square sides, which makes it
unlikely that the bit will cam out of the screw's slots...
And, makes it incompatible with phillips screw drivers.
To get the square sides on the driver bit, they have to
use a narrower grinding wheel, which leaves 8 facets on
the screwdriver (as opposed to the Phillips 4 facets.).
JIS and pozidriv bits usually break when the torque is
exceeded. You have been warned.
Torx and square drive are the kings of readily available
high torque screws. Allen is a distant second.
-Chuck Harris
On Sat, 17 Sep 2022 18:26:32 -0500 "Steve Holland via groups.io"
<sholland@...> wrote:
People: I keep learning useful stuff on these threads even when
looking at posts about equipment I don¡¯t own. Pozidrive screws: Great
tip!
Steve
|
Raymond, Clay, You both sort of got beat by a hair with the 4 youtube videos Clay is talking about. Must be this:?.?
And yes, I take back my statement on the overall assembly design of this unit. I didn't know there's just one SMA connecting?the shielded modules (there's actually several in my unit as to, I think, the youtube sample, but they're not rigid lines), but overall, it's a breeze to take apart (once you know what the correct path is).?
Thank you both! On to the work for me. Radu.?
On Sat, Sep 17, 2022 at 4:42 PM Raymond Domp Frank < hewpatek@...> wrote: On Sun, Sep 18, 2022 at 01:22 AM, freshndaire wrote:
I would not call this unit hard to service or a poor mechanical design.? Pull the big aluminum hunk and you have lots of access!? The synthesizer module has 3 long bolts holding it in.? Remove the SMA Semi-rigid coax cable from the module's backplane then pull the 3 screws in the middle and you can lift the synth module and set it aside with the other cables plugged in IIRC.
So my memory served me right!
Raymond
|
Re: HP 400E sticky needle
I would think that other glues might be more easily used.
For instance, a famous very old glue is milk. A drop of
milk will hold very well, but is also water soluble.
Milk is the original ingredient in white glues such as
Elmer's... which is why the bottle has a cow on it.
Back when I was brewing beer, I used milk to glue the labels
onto the bottles. I just put some in a saucer, and dipped
the label in, and onto the bottle.
I have a current meter that has the dial card flaking problem,
I think I will try a little milk on a soft brush..
-Chuck Harris
toggle quoted message
Show quoted text
On Sat, 17 Sep 2022 15:09:51 -0700 "bd139" <me@...> wrote: Well the Pritt stick melted in hot water did a really good job of the
peeling. Looks excellent! However it's still sticking. I will
disassemble it again tomorrow and investigate further.
Attachments:
IMG_2548.JPG:
/g/HP-Agilent-Keysight-equipment/attachment/129583/0
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Re: Pozidriv screws on HP covers
Since nobody seems to have mentioned it, Pozidriv screws can be identified by a cross type screw slot, with a set of fine lines stamped in the head in between the crossed slots (a cross and a cross...). JIS have a single dot stamped in the head between two of the slots. Pozidriv screw slots have square sides, which makes it unlikely that the bit will cam out of the screw's slots... And, makes it incompatible with phillips screw drivers. To get the square sides on the driver bit, they have to use a narrower grinding wheel, which leaves 8 facets on the screwdriver (as opposed to the Phillips 4 facets.). JIS and pozidriv bits usually break when the torque is exceeded. You have been warned. Torx and square drive are the kings of readily available high torque screws. Allen is a distant second. -Chuck Harris On Sat, 17 Sep 2022 18:26:32 -0500 "Steve Holland via groups.io" <sholland@...> wrote: People: I keep learning useful stuff on these threads even when
looking at posts about equipment I don¡¯t own. Pozidrive screws: Great
tip!
Steve
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HP 1661A Logic Analyzer Schematics
Does anyone have the schematics for the HP 1661A Logic Analyzer?? I found the service manual, but no schematics.
Best regards,?
Alex
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On Sun, Sep 18, 2022 at 01:22 AM, freshndaire wrote:
I would not call this unit hard to service or a poor mechanical design.? Pull the big aluminum hunk and you have lots of access!? The synthesizer module has 3 long bolts holding it in.? Remove the SMA Semi-rigid coax cable from the module's backplane then pull the 3 screws in the middle and you can lift the synth module and set it aside with the other cables plugged in IIRC.
So my memory served me right! Raymond
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Before I dive deeply into troubleshooting maybe someone can give me a direction to look into first.
I have a HP 432A with a downward drift. Same problem on all three mounts that I have, a HP 478A, a HP X486A, and a Micronetics TM-400. So I¡¯m pretty sure it¡¯s not the mount! The drift is slight on the 10 mW range but gets quite bad as you go down in ranges. The shunt regulator +7V and -13V outputs seem okay. The meter otherwise is working, the drift is the only problem.
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Dave McGuire
Patricio A. Greco
Mike D.
Brian
Cubdriver
saipan59 (Pete)
Steve J. Noll, WA6EJO