Re: I'm old 70+, the 70K system is old; good or bad omen?
Hi Vladan ? The specs I looked at had a formula that I did not understand ? Regards Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of pianovt via groups.io Sent: 22 November 2021 02:13 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen? ? Just a reminder: the supply operates at 40KHz, so search for correct ESR values in that frequency range.
Vladan
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Re: I'm old 70+, the 70K system is old; good or bad omen?
Hi Vladan ? Thank you just going to bed it is 2:30 am hear Dues any one have an contacts at Sprague or Sangamo ? ? Best Regards Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of pianovt via groups.io Sent: 22 November 2021 02:01 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen? ? Here you go. All are 105C.
================================ C32, C43 0180-3068? 470u/12v Sprague? 672D477H012DM5J Sangamo? 301AEM471U012B3 ESR 0.12 Ohm max Max. ripple current 1.3A
================================ C17, C18 0180-3441? 270u/25v Sprague? 672D277H025DM5J Sangamo? 301AEM271U025B3 ESR - sorry, can't find a value. Max. ripple current 1.35A
================================ C52 0180-3443? 560u/7.5v Sprague? 672D567H7R5DM5J Sangamo? 301AEM561U7R5B3 ESR 0.28 Ohm max
=============================== C42 0180-3442? 1200u/12v Sprague? 672D128H012ET5J ESR? 0.125 Ohm max Max. ripple current 2.5A
===============================
Vladan
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Re: I'm old 70+, the 70K system is old; good or bad omen?
Hi Craig ? Thank you for the manual but? all the manuals we currently have are hear and the Clips are with Artek unfortunately I cannot get to my service manuals or CLIPS at this time
[email protected] | Files ? Just a thought it might be useful to put some pictures into a file of the correct switch settings Also I have had switches going open CCT on other HP equipment ? ? Regards Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Craig Petersen Sent: 22 November 2021 01:58 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen? ? Gene,
The cabling looks correct between the modules according to the document I have in front of me. If all the other modules are showing up in the map the 70900A should be there to. The issue seems to be improper dip switch settings or some other unknown fault with the 70900A. I have attached the file for your reference.
Best Regards,
Craig Petersen.
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Re: I'm old 70+, the 70K system is old; good or bad omen?
Just a reminder: the supply operates at 40KHz, so search for correct ESR values in that frequency range.
Vladan
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Re: I'm old 70+, the 70K system is old; good or bad omen?
OK Dave and Harvey They are all going to get shot gunned / replaced we currently have about 8 off 70900 LO that are duff in the UK so a solution that works would be very good
Best Regards Paul
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Dave McGuire Sent: 22 November 2021 01:27 To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen? In the ones I've repaired, every one of those capacitors in that central column have been bad, with no exceptions. Just FYI. Heh, one of them was particularly weird. The lead *twirled* within the capacitor, as if it were connected to nothing at all inside. I put it on a bridge, and it read a few pF. It was supposed to have been 470uF! -Dave On 11/21/21 8:21 PM, Harvey White wrote: There's a philosophical point where you say:
1) these might be bad, I'll replace then all.
2) I'll only replace the ones that I know are bad.
To me, it depends on how difficult it would be to replace, and also what the probability is that all of these could be bad.
Your pick. I don't think that there's an absolute "this is the right way".
Harvey
On 11/21/2021 6:06 PM, Paul Bicknell wrote:
Hi Tom
Thank you for looking up the part numbers please look at the xl document I have put onto the HP 70900 folder in the HP 70000 on this site
as I am using it to compare the values of the capacitors measured in and out of CCT on a number of 70900 units
hopefully this might help speed up repairing 70900 in the future
Vladan I have put a number of Vishay spc sheets in the same file along with a list of their suitability size and availability
Regards Paul
*From:*[email protected] [mailto:[email protected]] *On Behalf Of *tmillermdems *Sent:* 21 November 2021 22:41 *To:* [email protected] *Subject:* Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?
From the 70900B CLIP:
C32 0180-3068 470u/12v
C17, C18 0180-3441 270u/25v
C52 0180-3443 560u/7.5v
C43 0180-3068 470u/12v
C42 0180-3442 1200u/12v
AL-ELCTLT
Regards,
Tom
On 11/21/2021 4:34 PM, pianovt via groups.io wrote:
Paul,
If you (or someone else) can post the HP part numbers for the capacitors, there is a chance that I may be able to find out what ESR specs were used when the module was designed.
Vladan
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Re: I'm old 70+, the 70K system is old; good or bad omen?
Hi Harvey? Regarding ? There's a philosophical point where you say: 1) these might be bad, I'll replace then all. 2) I'll only replace the ones that I know are bad. ? I agree with line 1 in this case? but ?if they all test with correct capacitance and low ESR then it might be worth looking else ware before changing them It could be that only one capacitor is critical and it wasn’t man enough for the job in the first place Just a thought? ? Regards Paul ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Harvey White Sent: 22 November 2021 01:21 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?? There's a philosophical point where you say: 1) these might be bad, I'll replace then all. 2) I'll only replace the ones that I know are bad. To me, it depends on how difficult it would be to replace, and also what the probability is that all of these could be bad. Your pick.? I don't think that there's an absolute "this is the right way". Harvey On 11/21/2021 6:06 PM, Paul Bicknell wrote: Hi Tom ? Thank you for looking up the part numbers? please look at the xl document I have put onto the HP 70900 folder in the HP 70000 on this site as I am using it to compare the values of the capacitors measured in and out of CCT on a number of 70900 units hopefully this might help speed up repairing 70900 in the future ? Vladan I have put a number of Vishay spc sheets in the same file along with a list of their suitability? size and availability ? Regards Paul ? ? From the 70900B CLIP: C32 0180-3068? 470u/12v C17, C18? 0180-3441? 270u/25v C52 0180-3443? 560u/7.5v C43 0180-3068? 470u/12v C42? 0180-3442? 1200u/12v AL-ELCTLT Regards, Tom On 11/21/2021 4:34 PM, pianovt via groups.io wrote: Paul,
If you (or someone else) can post the HP part numbers for the capacitors, there is a chance that I may be able to find out what ESR specs were used when the module was designed.
Vladan
?
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Re: I'm old 70+, the 70K system is old; good or bad omen?
Here you go. All are 105C.
================================ C32, C43 0180-3068? 470u/12v Sprague? 672D477H012DM5J Sangamo? 301AEM471U012B3 ESR 0.12 Ohm max Max. ripple current 1.3A
================================ C17, C18 0180-3441? 270u/25v Sprague? 672D277H025DM5J Sangamo? 301AEM271U025B3 ESR - sorry, can't find a value. Max. ripple current 1.35A
================================ C52 0180-3443? 560u/7.5v Sprague? 672D567H7R5DM5J Sangamo? 301AEM561U7R5B3 ESR 0.28 Ohm max
=============================== C42 0180-3442? 1200u/12v Sprague? 672D128H012ET5J ESR? 0.125 Ohm max Max. ripple current 2.5A
===============================
Vladan
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Re: I'm old 70+, the 70K system is old; good or bad omen?
Gene,
The cabling looks correct between the modules according to the document I have in front of me. If all the other modules are showing up in the map the 70900A should be there to. The issue seems to be improper dip switch settings or some other unknown fault with the 70900A. I have attached the file for your reference.
Best Regards,
Craig Petersen.
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Re: I'm old 70+, the 70K system is old; good or bad omen?
sounds like case #1 to me <grin>
I've seen people who say "replace them all"
I've seen people who say "replace only bad"
As a philosophy, neither is likely right.
Harvey
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On 11/21/2021 8:26 PM, Dave McGuire wrote: ? In the ones I've repaired, every one of those capacitors in that central column have been bad, with no exceptions.? Just FYI.
? Heh, one of them was particularly weird.? The lead *twirled* within the capacitor, as if it were connected to nothing at all inside.? I put it on a bridge, and it read a few pF.? It was supposed to have been 470uF!
????????? -Dave
On 11/21/21 8:21 PM, Harvey White wrote:
There's a philosophical point where you say:
1) these might be bad, I'll replace then all.
2) I'll only replace the ones that I know are bad.
To me, it depends on how difficult it would be to replace, and also what the probability is that all of these could be bad.
Your pick.? I don't think that there's an absolute "this is the right way".
Harvey
On 11/21/2021 6:06 PM, Paul Bicknell wrote:
Hi Tom
Thank you for looking up the part numbers? please look at the xl document I have put onto the HP 70900 folder in the HP 70000 on this site
as I am using it to compare the values of the capacitors measured in and out of CCT on a number of 70900 units
hopefully this might help speed up repairing 70900 in the future
Vladan I have put a number of Vishay spc sheets in the same file along with a list of their suitability? size and availability
Regards Paul
*From:*[email protected] [mailto:[email protected]] *On Behalf Of *tmillermdems *Sent:* 21 November 2021 22:41 *To:* [email protected] *Subject:* Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?
From the 70900B CLIP:
C32 0180-3068? 470u/12v
C17, C18? 0180-3441? 270u/25v
C52 0180-3443? 560u/7.5v
C43 0180-3068? 470u/12v
C42? 0180-3442? 1200u/12v
AL-ELCTLT
Regards,
Tom
On 11/21/2021 4:34 PM, pianovt via groups.io wrote:
??? Paul,
??? If you (or someone else) can post the HP part numbers for the ??? capacitors, there is a chance that I may be able to find out what ??? ESR specs were used when the module was designed.
??? Vladan
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Re: SMD rework on an HP PCB
After finding no replacement VFDs under $230 plus tax on eBay, I located a company called PDA Parts that has the Samsung INB-12MM53T VFD in stock. It's the latest iteration of the 53132A display and their photo confirms that it's the correct one. It's "only" $108, but I have no other options so it seems. Anyway, one should be arriving sometime this week or early next week.
I hope that's the only problem, but I'm pretty sure it is. There will be either screams of delight or screams of anguish after I install the new display and power it up!
Stan
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Dave McGuire Sent: Sunday, November 21, 2021 5:14 PM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] SMD rework on an HP PCB On 11/21/21 8:07 PM, Stan wrote: Turns out that it's the VFD in my 58503A that is bad, and not the driver chip. Damn. :-( The good news is that I don't have to do any PCB rework. The bad news is that I have to find a replacement VFD at a reasonable price.
Any ideas (besides eBay)? And if I do end up buying on eBay, does anyone have any experience with replacement VFDs from China? I have no direct experience with them, but a lot of people have said they are actually pretty good. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: I'm old 70+, the 70K system is old; good or bad omen?
In the ones I've repaired, every one of those capacitors in that central column have been bad, with no exceptions. Just FYI.
Heh, one of them was particularly weird. The lead *twirled* within the capacitor, as if it were connected to nothing at all inside. I put it on a bridge, and it read a few pF. It was supposed to have been 470uF!
-Dave
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On 11/21/21 8:21 PM, Harvey White wrote: There's a philosophical point where you say: 1) these might be bad, I'll replace then all. 2) I'll only replace the ones that I know are bad. To me, it depends on how difficult it would be to replace, and also what the probability is that all of these could be bad. Your pick.? I don't think that there's an absolute "this is the right way". Harvey On 11/21/2021 6:06 PM, Paul Bicknell wrote:
Hi Tom
Thank you for looking up the part numbers? please look at the xl document I have put onto the HP 70900 folder in the HP 70000 on this site
as I am using it to compare the values of the capacitors measured in and out of CCT on a number of 70900 units
hopefully this might help speed up repairing 70900 in the future
Vladan I have put a number of Vishay spc sheets in the same file along with a list of their suitability? size and availability
Regards Paul
*From:*[email protected] [mailto:[email protected]] *On Behalf Of *tmillermdems *Sent:* 21 November 2021 22:41 *To:* [email protected] *Subject:* Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?
From the 70900B CLIP:
C32 0180-3068? 470u/12v
C17, C18? 0180-3441? 270u/25v
C52 0180-3443? 560u/7.5v
C43 0180-3068? 470u/12v
C42? 0180-3442? 1200u/12v
AL-ELCTLT
Regards,
Tom
On 11/21/2021 4:34 PM, pianovt via groups.io wrote:
Paul,
If you (or someone else) can post the HP part numbers for the capacitors, there is a chance that I may be able to find out what ESR specs were used when the module was designed.
Vladan
------------------------------------------------------------------------
Avast logo <>
This email has been checked for viruses by Avast antivirus software. www.avast.com <>
-- Dave McGuire, AK4HZ New Kensington, PA
|
Re: I'm old 70+, the 70K system is old; good or bad omen?
There's a philosophical point where you say:
1) these might be bad, I'll replace then all.
2) I'll only replace the ones that I know are bad.
To me, it depends on how difficult it would be to replace, and
also what the probability is that all of these could be bad.
Your pick.? I don't think that there's an absolute "this is the
right way".
Harvey
On 11/21/2021 6:06 PM, Paul Bicknell
wrote:
toggle quoted message
Show quoted text
Hi
Tom
?
Thank
you for looking up the part numbers? please look at the xl
document I have put onto the HP 70900 folder in the HP 70000
on this site
as
I am using it to compare the values of the capacitors
measured in and out of CCT on a number of 70900 units
hopefully
this might help speed up repairing 70900 in the future
?
Vladan I have put a number of Vishay spc
sheets in the same file along with a list of their
suitability? size and availability
?
Regards
Paul
?
?
From the 70900B CLIP:
C32 0180-3068? 470u/12v
C17, C18? 0180-3441? 270u/25v
C52 0180-3443? 560u/7.5v
C43 0180-3068? 470u/12v
C42? 0180-3442? 1200u/12v
AL-ELCTLT
Regards,
Tom
On 11/21/2021 4:34 PM, pianovt via
groups.io wrote:
Paul,
If you (or someone else) can post the HP part numbers for
the capacitors, there is a chance that I may be able to find
out what ESR specs were used when the module was designed.
Vladan
?
|
This
email has been checked for viruses by Avast
antivirus software.
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Re: SMD rework on an HP PCB
On 11/21/21 8:07 PM, Stan wrote: Turns out that it's the VFD in my 58503A that is bad, and not the driver chip. Damn. :-( The good news is that I don't have to do any PCB rework. The bad news is that I have to find a replacement VFD at a reasonable price. Any ideas (besides eBay)? And if I do end up buying on eBay, does anyone have any experience with replacement VFDs from China? I have no direct experience with them, but a lot of people have said they are actually pretty good. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Re: SMD rework on an HP PCB
Turns out that it's the VFD in my 58503A that is bad, and not the driver chip.
The good news is that I don't have to do any PCB rework. The bad news is that I have to find a replacement VFD at a reasonable price.
Any ideas (besides eBay)? And if I do end up buying on eBay, does anyone have any experience with replacement VFDs from China?
Thanks, Stan
|
Re: I'm old 70+, the 70K system is old; good or bad omen?
Hi Gene, ? I believe you may have wrong “HP-MSIB/HP-IB Address” setting on your 70900 unit. The plug-in unit on the address map is based on their hardware MSIB/HP-IB Address setting not by default! ? Steve Cheng BC Canada ? ?
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Re: I'm old 70+, the 70K system is old; good or bad omen?
Steve, ? Thanks for your input. I believe the switches you refer to for the 70900A set the Address Map and Slave/Master. ? Could incorrect settings on the 709002A and 709005A stop the 70900A from being recognized in the A-Map? ? Pre-Thanks and Regards ? Gene ?
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From: [email protected] < [email protected]> On Behalf Of Steve Davies Sent: Sunday, November 21, 2021 12:07 AM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen? ? At least check the 70900A DIP switches on the top are set to something sensible, and check what the front LEDs display when you power (or attempt to power) it up.
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Re: I'm old 70+, the 70K system is old; good or bad omen?
Craig. ? ? First off big thanks for your input… ? Agreed that verifying system configuration needs looking into. The read cabling looks Ok I believe. 
? Confidence test has passed…OK? 
What I see on the A-Map is the following for 70205A is Row/Column 0,0 
For 70902A/18,1 and 70905A/4,18 
Row/Column | Local Oscillator | IF | RF | Display | Good Unit | 0,18 | 1,18 | 6,18 | 0,4 | Bad Unit | Missing | 1,18 | 4,18 | 0,0 |
? As stated, there is no entry for the 70900A anywhere within the A-Map, which I believe points to a couple of questions/possibilities. ????? or - Can conflicts within the system configuration result in the 70900A not to be recognized in the A-Map?
? ? ? If I understand your advice, all the modules should, minus display, appear in column 18 if defaults are set ? ? Appreciate your input ?
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From: [email protected] < [email protected]> On Behalf Of Craig Petersen Sent: Saturday, November 20, 2021 10:45 PM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen? ? I have this very instrument. The 70900A should show up in row 0 column 18, and if the HPIB functionality is enabled for this module it will also show up on HPIB address 18. The RF section should show up in row 6 column 18, (70904A in my instrument) the IF section (70902A) should be in row 1 column 18, the display should be in row 0 column 4. If there are no power supply issues (because I notice the "volt/temp" LED is not illuminated) I would also recommend pulling all the modules out and setting them to their default positions Where are defaults found? and making sure you have all the necessary SMB and semi-rigid cables routed correctly. CHECKED Even with dead batteries the unit will still function, but will complain about the confidence test TEST PASSED OK ? and the 70900A will not keep calibration coefficients after a power cycle.??
Best Regards,
Craig Petersen.
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Re: I'm old 70+, the 70K system is old; good or bad omen?
Hi Tom ? Thank you for looking up the part numbers? please look at the xl document I have put onto the HP 70900 folder in the HP 70000 on this site as I am using it to compare the values of the capacitors measured in and out of CCT on a number of 70900 units hopefully this might help speed up repairing 70900 in the future ? Vladan I have put a number of Vishay spc sheets in the same file along with a list of their suitability? size and availability ? Regards Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of tmillermdems Sent: 21 November 2021 22:41 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?? From the 70900B CLIP: C32 0180-3068? 470u/12v C17, C18? 0180-3441? 270u/25v C52 0180-3443? 560u/7.5v C43 0180-3068? 470u/12v C42? 0180-3442? 1200u/12v AL-ELCTLT Regards, Tom On 11/21/2021 4:34 PM, pianovt via groups.io wrote: Paul,
If you (or someone else) can post the HP part numbers for the capacitors, there is a chance that I may be able to find out what ESR specs were used when the module was designed.
Vladan
?
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Re: I'm old 70+, the 70K system is old; good or bad omen?
From the 70900B CLIP:
C32 0180-3068? 470u/12v
C17, C18? 0180-3441? 270u/25v
C52 0180-3443? 560u/7.5v
C43 0180-3068? 470u/12v
C42? 0180-3442? 1200u/12v
AL-ELCTLT
Regards,
Tom
On 11/21/2021 4:34 PM, pianovt via
groups.io wrote:
Paul,
If you (or someone else) can post the HP part numbers for the
capacitors, there is a chance that I may be able to find out what
ESR specs were used when the module was designed.
Vladan
|
This email has been checked for viruses by Avast antivirus software.
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|
Re: I'm old 70+, the 70K system is old; good or bad omen?
Paul,
If you (or someone else) can post the HP part numbers for the capacitors, there is a chance that I may be able to find out what ESR specs were used when the module was designed.
Vladan
|