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Hello there!
I just bought a parts 8350B mainframe with burnt T1 main transformer. Anyone knows the current ratings of that transformer? Seeing the dozen fuses all over the instrument I get an idea about the current drawings... but that fuses are part of the crowbar protection circuits and maybe are overrated for that purposes. I don't know if adding those figures will let me know the proper current ratings.
I'll ask how much for a new one, and if the price is going nuts, maybe I'll try to repair with meanwell bricks... or scrap it for parts, because it was cheap.
Cheers!
Ruben
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Ruben,
Do you have the HP part number for the transformer?
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On Feb 2, 2022, at 3:40 PM, RubenRubio <rubenrb2019@...> wrote:
? Hello there!
I just bought a parts 8350B mainframe with burnt T1 main transformer. Anyone knows the current ratings of that transformer? Seeing the dozen fuses all over the instrument I get an idea about the current drawings... but that fuses are part of the crowbar protection circuits and maybe are overrated for that purposes. I don't know if adding those figures will let me know the proper current ratings.
I'll ask how much for a new one, and if the price is going nuts, maybe I'll try to repair with meanwell bricks... or scrap it for parts, because it was cheap.
Cheers!
Ruben
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Hi Steve
The HP part number is 9100-4603
Regards,
Ruben
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This is what my manual says  but the description is confusing!
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Hi Ruben,
Keysight says that part number is obsolete and replaced by 08350-60064, also obsolete. I think your best bet may be finding a parts donor 8350B. Shipping a transformer would be really expensive unless you find one close to you.?
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On Feb 2, 2022, at 4:33 PM, RubenRubio <rubenrb2019@...> wrote:
? Hi Steve
The HP part number is 9100-4603
Regards,
Ruben
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Neither of those seem correct. The first is a 6v transformer for HPIL and it looks like the second may be for 400 Hz (aircraft power) operation.?
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On Feb 2, 2022, at 4:34 PM, Mark Bielman <mbielman@...> wrote:
?This is what my manual says  but the description is confusing!
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The 9100-4603 is the part actually installed in my unit. Two primary windings (0-120-230 and 0 120 for fan) and five secondary windings (two simple at 26.3 and 47.5 Vrms and three w/ center tap: 21-0-21, 16.9-0-16.9 and 11.8-0-11.8) Probably make a new transformer costs more than a working mainframe... but I like challenges and this poor rusty unit maybe deserves a second life.?
Yes, manual says that. We have the same outdated manuals :D
Regards
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The HPIL reference makes no sense at all!
Mark
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Neither of those seem correct. The first is a 6v transformer for HPIL and it looks like the second may be for 400 Hz (aircraft power) operation.?
On Feb 2, 2022, at 4:34 PM, Mark Bielman <mbielman@...> wrote:
?This is what my manual says
but the description is confusing!
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That’s the HP Interface Loop so I assume the transformer noted is probably an isolation transformer for an HPIL connection but I don’t believe the 8350B had that interface capability so it is a puzzler. None of my 8350B’s have an HPIL socket or I’d be tempted to plug in a keyboard or mouse and see what happened?
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On Feb 2, 2022, at 5:17 PM, Mark Bielman <mbielman@...> wrote:
?
The HPIL reference makes no sense at all!
Mark
Neither of those seem correct. The first is a 6v transformer for HPIL and it looks like the second may be for 400 Hz (aircraft power) operation.?
On Feb 2, 2022, at 4:34 PM, Mark Bielman <mbielman@...> wrote:
?This is what my manual says
but the description is confusing!
|
Yeah, HP-IL didn't exist then. I think I saw in the manual somewhere that the fan has its own transformer. I wonder if that's it.
My schematics are so distorted I cannot really read them.
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That’s the HP Interface Loop so I assume the transformer noted is probably an isolation transformer for an HPIL connection but I don’t believe the 8350B had that interface capability so it is a puzzler. None of my 8350B’s have an HPIL socket
or I’d be tempted to plug in a keyboard or mouse and see what happened?
On Feb 2, 2022, at 5:17 PM, Mark Bielman <mbielman@...> wrote:
?
The HPIL reference makes no sense at all!
Mark
Neither of those seem correct. The first is a 6v transformer for HPIL and it looks like the second may be for 400 Hz (aircraft power) operation.?
On Feb 2, 2022, at 4:34 PM, Mark Bielman <mbielman@...> wrote:
?This is what my manual says
but the description is confusing!
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Hi again
I'm using at the same time?the op & service manual from Keysight and the same manual from KO4BB website, which has readable schematics but some missing and misplaced pages... every search is a time consuming task.?
I wrote to a local custom transformer maker for an estimate. Depending on the price, I'll decide. The meanwell modules option is attractive at first because there's a lot of room for them (I remember the odissey in my 8663A a year ago to fit four bricks) once T1 and filter caps be taken out. A6 and A7 has special functions circuits?that I cannot remove from the device to avoid malfunction, but i would have to think about it when it's time comes.
Regards,
Ruben
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Hi Ruben,
I have a printed manual for my 8350B and I attach some pics of the manual part number and the transformer part number and part of the power supply schematics - hope this helps.
Tony
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Thanks Tony! More clear than mine :D
The manual changes section shows that main transformer (mine is 9100-4603) has a few substitutes depending on the serial: 08350-60064, 9100-4277 and 9100-4337 (this last is the apropiate to my unit S/N 2642A...). It is impossible to get one of those, I only see a -4277 in USA and looks smaller and less-tapped than mine, so it don't match at all.
I located two cheap used transformers in UK: cheapest option is one from an 8566B SA, who has less taps but very powerfull ones (maybe I can use one for make various supplies if it is possible? or add an aditional little transformer I have for the +-15 volt supply); and for twice that money, one from a 8922 GSM analyzer, which has enough secondary windings, but it requires mess up with connections too (I attached a table of outputs of this instrument's power supply for reference). I suppose that feeding the rectifier board with slightly different voltages from transformer?(under certain tolerance)?doesn't affect the final result.
Can anyone send or post a photo of schematics of the main transformer, rectifier and regulator boards in the 8566B manual? Mine (I attached it) is almost not readable and I need those figures to decide which transformer I'll buy. Thanks in advance.
So maybe this adventure will continue.
Every opinion or advice is welcome, honestly. I'm here to learn :)
Regards,
Ruben
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At 02:33 PM 2/02/2022 -0800, you wrote: Hi Steve
The HP part number is 9100-4603
Regards,
Ruben Not according to my 8350B service manual. 08350-90034 Jan 1983. A paper original. There the T1 transformer is 9100-4227. Guy
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PD: To not bother you, I have already get the 8566B power supply readable schematic
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In that case the serial prefix is important, the OSM can be different for different production periods.
-Rik
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I have a very quick scan of the change sheet including schematic
from my printed manual if that might help. Sorry it's in parts but I
only have an A4 scanner!
I may have missed it but I didn't see the prefix for the instrument
you have?
Adrian
On 03/02/2022 12:14, RubenRubio wrote:
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Thanks Tony! More clear than mine :D
The manual changes section shows that main transformer (mine is
9100-4603) has a few substitutes depending on the serial:
08350-60064, 9100-4277 and 9100-4337 (this last is the apropiate
to my unit S/N 2642A...). It is impossible to get one of those,
I only see a -4277 in USA and looks smaller and less-tapped than
mine, so it don't match at all.
I located two cheap used transformers in UK: cheapest option is
one from an 8566B SA, who has less taps but very powerfull ones
(maybe I can use one for make various supplies if it is
possible? or add an aditional little transformer I
have for the +-15 volt supply); and for twice that money, one
from a 8922 GSM analyzer, which has enough secondary windings,
but it requires mess up with connections too (I attached a table
of outputs of this instrument's power supply for reference). I
suppose that feeding the rectifier board with slightly different
voltages from transformer?(under certain tolerance)?doesn't
affect the final result.
Can anyone send or post a photo of schematics of the main
transformer, rectifier and regulator boards in the 8566B manual?
Mine (I attached it) is almost not readable and I need those
figures to decide which transformer I'll buy. Thanks in advance.
So maybe this adventure will continue.
Every opinion or advice is welcome, honestly. I'm here to learn
:)
Regards,
Ruben
Attachments:
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Thanks Adrian! That helps a lot, my schematics are blurred!
I am a bit confused now, reading the ratings of fuses in A17 and A18 boards from 8566B SA. The current figures are low, specially for the 10 and 5 volt rails, even considering the size of the transformer (it looks bigger than mine). I am lost at this point.?
Maybe the 8566B main transforme could be swapable to my 8350B... but I am not sure, looking only the fuses ratings in both machines (I attached the tables). Maybe the transformer could do the job because overdimension or maybe not. Also depending the way to connect windings can help to feed enought current.
Opinions?
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PD: Well, evil is done... I just bought the 9100-4068 (8566B's) transformer. Can use it on 8350B or not,??20 it's a few money for that monster. If finally cannot restore the sweeper, I'll can do a big multi-channel regulated and limited bench power supply out of it's parts :D
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Hi Ruben,
Glad it helps, I've attached the cross reference for T1 part numbers
from my manual (which you may already have) and a scan of the A6
board main fold-out from the manual as well, I've not compared it
with the change-note version I sent earlier so I don't know if it is
relevant but I thought a non-blurred copy may be useful anyway!
Are you in the UK? I'm based near Cambridge.
Adrian
On 03/02/2022 15:27, RubenRubio wrote:
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Thanks Adrian! That helps a lot, my schematics are blurred!
I am a bit confused now, reading the ratings of fuses in A17 and
A18 boards from 8566B SA. The current figures are low, specially
for the 10 and 5 volt rails, even considering the size of the
transformer (it looks bigger than mine). I am lost at this
point.?
Maybe the 8566B main transforme could be swapable to my 8350B...
but I am not sure, looking only the fuses ratings in both
machines (I attached the tables). Maybe the transformer could do
the job because overdimension or maybe not. Also depending the
way to connect windings can help to feed enought current.
Opinions?
Attachments:
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RubenRubio
Guy Dunphy
Rik Bos
