Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- HP-Agilent-Keysight-Equipment
- Messages
Search
|
Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock
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:
-- ----------------------------------------------------------------------- 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
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:
Yes, you are correct, it is the HV Osc Q1, I was mixed with another section that was giving problems but resolved. |
|
Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock
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
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
Graham,
toggle quoted message
Show quoted text
By chance did you check the secondary is not being loaded down by a bad component? That would likely stall the oscillator. Dennis -------------------------------------------- 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
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
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 ________________________________________ 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 ------------------------------------ ------------------------------------ ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: ? ? <*> Your email settings: ? ? Individual Email | Traditional <*> To change settings online go to: ? ? ? ? (Yahoo! ID required) <*> To change settings via email: ? ? hp_agilent_equipment-digest@... ? ? hp_agilent_equipment-fullfeatured@... <*> To unsubscribe from this group, send an email to: ? ? hp_agilent_equipment-unsubscribe@... <*> Your use of Yahoo Groups is subject to: ? ? |
|
Re: 1853-0063 transistor needed
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
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: |
|
Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock
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
A-1853-0063-1 NTE Equvilent NTE218 TRANSISTOR PNP SILICON 90V IC=4A TO-66 CASE
toggle quoted message
Show quoted text
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: OT Omni Spectra Semi-Rigid Tools
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:
? |
|
Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock
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:
-- ----------------------------------------------------------------------- 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: 1853-0063 transistor needed
Greetings,
toggle quoted message
Show quoted text
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: |
|
Re: 1853-0063 transistor needed
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 |
|
Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock
开云体育Hi,this looks like a power supply problem ;-)
I would invest a few hours on searching for the problem. If it is in the power supply, it is likely that you can fix it relatively easy. I would guess a bad capacitor or voltage regulator.
You can always get a new board, but first you should try to figure out what board you really need. I would be surprised if the problem is on A17.
Check the power supply and all other voltages before thinking about getting new boards!
Tobias
-------- Original message --------
From: "jehancoc@... [hp_agilent_equipment]"
Date: 10/21/17 21:08 (GMT+01:00)
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock
?
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.
|
|
Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock
Changing the board won't help unless the raw supply filter cap for that supply happens to be on it. You likely just need to find and replace the cap and it should be good to go. I believe the cap is chassis mounted, or on the motherboard, or on a separate assembly along with some others. ? Ed |
to navigate to use esc to dismiss