Re: HP 1740A HV Oscillator has stopped running

[email protected]

Dave,

Bullseye, I took the 3 pin socket of the transistor and gave it a squirt of contact cleaner in the socket tubes and then plugged it back on and repeated the unplugging and replugging a few times and bingo, the traces are back on the screen, bobbie dazzler.

Many many thanks

Graham

Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock

#86382

开云体育

The one that you found is marked with a HP part number and was made in 1986.

If you have an ESR meter, I would be interested in knowing the capacitance, ESR and leakage of the failed part.

You might want to check the ones that you ordered to ensure that they are in fact good, as advertised.

Glenn

On 10/21/2017 8:39 PM, jehancoc@... [hp_agilent_equipment] wrote:

Yes, looks like it.? They only come in a few sizes and bolt patterns.

I found the actual part in the UK on ebay.? It is a Mepco/Centralab 0180-0452 as in:

?

I sent him a note but purchased the ones in your prior reply.? Nothing to loose at that price.

Thanks.

-- 
-----------------------------------------------------------------------
Glenn Little ETCS(SS) USN Ret, ARRL Technical Specialist,  SBE ARRL TAPR
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA LM  QCWA  LM 28417 
"It is not the class of license that the Amateur holds but the class 
of the Amateur that holds the license"
---------------------------------------------------------------------------

Re: OT Omni Spectra Semi-Rigid Tools

#86381

Thanks Steve.

I also have found the Tyco instruction sheets that show the use of the tooling. They also reference the M/A-Com and Omni-Spectra part numbers for the various tools.

However, the T-250A/450A is a mystery still......

Also, they must have made kits for N and TNC, but I find no reference to them...

So, I was wondering if Omni-Spectra ever put out tool info in their literature/catalogs...

Dan

Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock

#86380

Yes, looks like it.? They only come in a few sizes and bolt patterns.

I found the actual part in the UK on ebay.? It is a Mepco/Centralab 0180-0452 as in:

?

I sent him a note but purchased the ones in your prior reply.? Nothing to loose at that price.

Thanks.

Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock

#86379

开云体育

Does this look like the part?

The price seems reasonable.

Glenn

On 10/21/2017 7:41 PM, jehancoc@... [hp_agilent_equipment] wrote:

OK, so the award goes to Glen to who called it correctly.?

Though the problem manifested itself as low 12V, the issue was in the -10V supply.? This caused a 120Hz pulse in the -5.6V (approx.)?voltage to the reference circuit?for the 12V regulator.? I didn't have the correct cap but I swapped in a 4,000uf (13,000uf required) and up it came albeit with noise sidebands from the lack of filtering.

So where can I find a MEPCO/CENTRALAB 13,000UF 25Vdc 30 surge cap?

Thanks for all the help.?

Jerry

-- 
-----------------------------------------------------------------------
Glenn Little ETCS(SS) USN Ret, ARRL Technical Specialist,  SBE ARRL TAPR
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA LM  QCWA  LM 28417 
"It is not the class of license that the Amateur holds but the class 
of the Amateur that holds the license"
---------------------------------------------------------------------------

Re: HP 1740A HV Oscillator has stopped running

#86378

开云体育

No, the bias on Q2 is correct if 120v is good.? The 16.8v base voltage reverse biases the b-e junction of Q2 turning it OFF.? The 7.27v b-e bias on Q1 HV OSC is problematic.? This shoud be no more than 1vdc or so with the oscillator running.? Power transistor sockets can get flaky with age, and sometimes simply removing and re-installing the transistor will cure the problem.

Dave

On 10/21/2017 5:59 PM, graham.l.n.butcher@... [hp_agilent_equipment] wrote:

Show quoted text

Yes, you are correct, it is the HV Osc Q1, I was mixed with another section that was giving problems but resolved.

I'll pull it out and test it, I have already done that HV Disable Q1 and Q2. Someone else suggested on another group that Q2 was dicky, despite it checking ok on my tester, it was replaced as I have loads of equivalents but that wasn't the problem.?

So I'll try this test and let you now if is OK or not.

Graham

Re: HP 1740A HV Oscillator has stopped running

[email protected]

#86377

Dave,

HV OSC Q1 checks out just fine on my transistor tester and the connections to it from the board.

Graham

Re: HP 1740A HV Oscillator has stopped running

[email protected]

#86376

Dennis,

Do you mean like a capacitor shorting to ground? C3, C6, C7, C8 or C14 for instance?

Graham

Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock

#86375

OK, so the award goes to Glen to who called it correctly.?

Though the problem manifested itself as low 12V, the issue was in the -10V supply.? This caused a 120Hz pulse in the -5.6V (approx.)?voltage to the reference circuit?for the 12V regulator.? I didn't have the correct cap but I swapped in a 4,000uf (13,000uf required) and up it came albeit with noise sidebands from the lack of filtering.

So where can I find a MEPCO/CENTRALAB 13,000UF 25Vdc 30 surge cap?

Thanks for all the help.?

Jerry

Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock

#86374

Glen, it could be a bad cap on the -10V as the voltage is lower than it should be and of all the caps, that is where I see 4.6V of AC.? I'm going to take it out and bridge in a cap that I have in that range.? It strange that it is showing up in the 12V supply but I guess since the reference voltage is hosed it could be the issue.

It's almost always a cap.

Thanks

Jerry

Re: HP 1740A HV Oscillator has stopped running

#86373

Graham,

By chance did you check the secondary is not being loaded down by a bad component? That would likely stall the oscillator.

Dennis

--------------------------------------------

Show quoted text

On Sat, 10/21/17, graham.l.n.butcher@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

 Subject: [hp_agilent_equipment] Re: HP 1740A HV Oscillator has stopped running
 To: hp_agilent_equipment@...
 Date: Saturday, October 21, 2017, 6:59 PM
  Yes, you are correct, it is the HV Osc Q1, I was mixed with
 another section that was giving problems but
 resolved.
 I'll pull it
 out and test it, I have already done that HV Disable Q1 and
 Q2. Someone else suggested on another group that Q2 was
 dicky, despite it checking ok on my tester, it was replaced
 as I have loads of equivalents but that wasn't the
 problem.?
 So I'll
 try this test and let you now if is OK or not.
 Graham

Re: HP 1740A HV Oscillator has stopped running

[email protected]

#86372

Yes, you are correct, it is the HV Osc Q1, I was mixed with another section that was giving problems but resolved.

I'll pull it out and test it, I have already done that HV Disable Q1 and Q2. Someone else suggested on another group that Q2 was dicky, despite it checking ok on my tester, it was replaced as I have loads of equivalents but that wasn't the problem.?

So I'll try this test and let you now if is OK or not.

Graham

Re: 1853-0063 transistor needed

Bob Albert

#86371

Sorry abpit the NTE214; I must have mixed up the number.? But the info is online.

Bob

On Saturday, October 21, 2017 1:47 PM, "george g_einst@... [hp_agilent_equipment]" wrote:

Electrically equivalent mechanically no, the 1853-0063 is a TO3 device not a TO66

George G6HIG
________________________________________

Show quoted text

From: hp_agilent_equipment@... <hp_agilent_equipment@...> on behalf of Dennis Czelusniak czelusniakd@... [hp_agilent_equipment] <hp_agilent_equipment@...>
Sent: 21 October 2017 20:22:48
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] 1853-0063 transistor needed

A-1853-0063-1 NTE Equvilent NTE218 TRANSISTOR PNP SILICON 90V IC=4A TO-66 CASE

All I did was GOOGLE and that's what it shows as equivalent.

Dennis

--------------------------------------------
On Sat, 10/21/17, mmaseda@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Subject: [hp_agilent_equipment] 1853-0063 transistor needed
To: hp_agilent_equipment@...
Date: Saturday, October 21, 2017, 1:25 PM

Anyone know of a source or cross reference for a
1853-0063 transistor used in the 410C?? I’ve already
have a query into Walter at Sphere.
Thanks in
advance,Manuel

------------------------------------

------------------------------------

------------------------------------

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Re: 1853-0063 transistor needed

#86370

Electrically equivalent mechanically no, the 1853-0063 is a TO3 device not a TO66

George G6HIG
________________________________________
From: hp_agilent_equipment@... <hp_agilent_equipment@...> on behalf of Dennis Czelusniak czelusniakd@... [hp_agilent_equipment] <hp_agilent_equipment@...>
Sent: 21 October 2017 20:22:48
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] 1853-0063 transistor needed

A-1853-0063-1 NTE Equvilent NTE218 TRANSISTOR PNP SILICON 90V IC=4A TO-66 CASE

All I did was GOOGLE and that's what it shows as equivalent.

Dennis

--------------------------------------------
On Sat, 10/21/17, mmaseda@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Subject: [hp_agilent_equipment] 1853-0063 transistor needed
To: hp_agilent_equipment@...
Date: Saturday, October 21, 2017, 1:25 PM

Anyone know of a source or cross reference for a
1853-0063 transistor used in the 410C?  I’ve already
have a query into Walter at Sphere.
Thanks in
advance,Manuel

Re: 1853-0063 transistor needed

#86369

Hi Ken

Please read my posting, I said PNP2N3055, yes their is such a device and it is PNP.  It was produced as a compliment to the 2N3055.

73 George G6HIG
________________________________________
From: hp_agilent_equipment@... <hp_agilent_equipment@...> on behalf of ken chalfant kpchalfant@... [hp_agilent_equipment] <hp_agilent_equipment@...>
Sent: 21 October 2017 19:53
To: hp_agilent_equipment
Subject: Re: [hp_agilent_equipment] 1853-0063 transistor needed

Greetings,

Of course, the world is filled with things I don’t know - but I think the 2N3055 is an NPN transistor.

I believe its PNP complement is Mj2955.

Don’t just take my word, I may be wrong - double check.

Regards,

Ken

On 21Oct, 2017, at 1:41 PM, george g_einst@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Hi Manuel

The transistor is a low spec Si PNP, try 2N2955 or even a PNP2N3055. Spec is Si PNP,55V, 5A, FT 3MHZ in a TO3 case.

73 George G6HIG
________________________________________
From: hp_agilent_equipment@... <hp_agilent_equipment@...> on behalf of mmaseda@... [hp_agilent_equipment] <hp_agilent_equipment@...>
Sent: 21 October 2017 17:25
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] 1853-0063 transistor needed

Anyone know of a source or cross reference for a 1853-0063 transistor used in the 410C? I’ve already have a query into Walter at Sphere.

Thanks in advance,

Manuel

------------------------------------

------------------------------------

------------------------------------

Yahoo Groups Links

Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock

#86368

So the filtered feed to the 12V comes off the cap that also feeds the 20V supply.? I have around 30V coming off that cap into the 12V regulator.? The output of the 12V regulator is only 9.5V.

So I guess I can start by replacing the regulator which looks like a job.

Thanks for the input.

Re: 1853-0063 transistor needed

#86367

A-1853-0063-1 NTE Equvilent NTE218 TRANSISTOR PNP SILICON 90V IC=4A TO-66 CASE

All I did was GOOGLE and that's what it shows as equivalent.

Dennis

--------------------------------------------

Show quoted text

On Sat, 10/21/17, mmaseda@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

 Subject: [hp_agilent_equipment] 1853-0063 transistor needed
 To: hp_agilent_equipment@...
 Date: Saturday, October 21, 2017, 1:25 PM

 Anyone know of a source or cross reference for a
 1853-0063 transistor used in the 410C? ?I’ve already
 have a query into Walter at Sphere.
 Thanks in
 advance,Manuel

Re: OT Omni Spectra Semi-Rigid Tools

#86366

开云体育

Dan,

I have a nearly complete T-200/500 that I got a couple of years ago. It's on a shelf around here somewhere. At the time I did a bunch of searching and discovered the TE-Connectivity replacement kit. I downloaded the basic instruction sheet and a bunch of files for using the kit for various Omni-Spectra SMA connectors. Let me do some archaeology and see if I can find the files. They may or may not be applicable to your kit, too.

Steve

On 10/20/2017 7:23 PM, djn@... [hp_agilent_equipment] wrote:

Show quoted text

?

Recently I obtained an Omni-Spectra Semi-Rigid Tool set for use to attach SMA connectors to .141 and other semi-rigid coax..... The set was called a T-200/400 set.

I also see on Ebay a T-450 set....

Which gives me wonder....what connectors was it for.

So, I was wondering if anyone knows what Omni-Specta tooling numbers match which connectors....

And, is there any old catalogs out there with more detail?

Just a nice curiosity from the past that I'm trying to bring into the present....

Dan in Chandler, AZ

Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock

#86365

Yes, I spoke too quickly about replacing the A17.? The regulator is off board on what I think is called the A23.? I'm trying to find the filter cap for the input to that regulator now but the schematic is hard to read.

Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock

#86364

开云体育

Check the power supplies and replace the bad filter capacitors.

Glenn

On 10/21/2017 3:07 PM, jehancoc@... [hp_agilent_equipment] wrote:

I opened up my 8566B and found that the +12v on the A17 board to be reading 9.5V with 4.5 of AC ripple.??? The fuses on this board are ok.? No burning ext.

Should I just find a used board?? Is this board used in any others like the 8568b?

Thanks again.

-- 
-----------------------------------------------------------------------
Glenn Little ETCS(SS) USN Ret, ARRL Technical Specialist,  SBE ARRL TAPR
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA LM  QCWA  LM 28417 
"It is not the class of license that the Amateur holds but the class 
of the Amateur that holds the license"
---------------------------------------------------------------------------