Strange E3610A PSU - Old revision
I just bought a E3610A PSU on ebay , as defective.
Main problem right now is ... This seems to be an older revision
And has other comp values , than the "Schematic on the net"
Comp Item - Org Value - Inserted
value
R19 CC frontpanel Pot - 10 turn 10k - 1 turn 10K
U2 12v Regulator - MC7812CT - LM340T12
U4 Current OpAmp - LF442CN - LM1458N
U5 CC/CV Indicator - LM393CN - LM393N
U1 Voltage OpAmp - LF411CN - LM741EN
U3 Volt Ref - LM336-5.0 5.0v - LM329 6.9v
PCB PCB number - ??
C7 Pos. REF CAP - 330uF 50v - 330uF 50v
C13 Neg. REF CAP - 470uF 50v - 330uF 50v
I posted some pics here.
http://tinyurl.com/cn9p4s9
Does anyone have a schematic of a E3610A , that might have ie. LM1458 in
it or a 6.9v Ref , instead of a 5v Ref ?
Tia
CFO Denmark
They actually changed from thru hole to surface mount on a number of HP/Agilent power supplies strangely with no change in model or even rev on a few models, so it could be a prototype but most likely is just a early rev so do not sweat the different part values. The good news is the repair may be simple, clearly it has a bad cap/s I can see them leaking on the board.
Wash the board repeatedly with alcohol once you remove any that have an oil film around them or it will attack the traces. Replace with only 105C rating. Hope that helps
Thomas Knox
To: time-nuts@febo.com
From: xnews3@luna.dyndns.dk
Date: Mon, 11 Jun 2012 19:18:58 +0000
Subject: [time-nuts] Strange E3610A PSU - Old revision
I just bought a E3610A PSU on ebay , as defective.
Main problem right now is ... This seems to be an older revision
And has other comp values , than the "Schematic on the net"
Comp Item - Org Value - Inserted
value
R19 CC frontpanel Pot - 10 turn 10k - 1 turn 10K
U2 12v Regulator - MC7812CT - LM340T12
U4 Current OpAmp - LF442CN - LM1458N
U5 CC/CV Indicator - LM393CN - LM393N
U1 Voltage OpAmp - LF411CN - LM741EN
U3 Volt Ref - LM336-5.0 5.0v - LM329 6.9v
PCB PCB number - ??
C7 Pos. REF CAP - 330uF 50v - 330uF 50v
C13 Neg. REF CAP - 470uF 50v - 330uF 50v
I posted some pics here.
http://tinyurl.com/cn9p4s9
Does anyone have a schematic of a E3610A , that might have ie. LM1458 in
it or a 6.9v Ref , instead of a 5v Ref ?
Tia
CFO Denmark
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There appears to be some massive contamination on the board, apparently
not only from a leaked electrolytic cap. It looks much like some unknown
liquid flooded a large area of the board and dried.
I do not see any reworked solder joints on the board, so the 'unusual'
components have to be original to the unit. Do not attempt to change the
circuit (replace components with values from a schematic that does not
match the given circuit exactly), otherwise you'll end up in a mess. You
may perform the service note changes though, given you check carefully
if they work for your unit. Especially the voltage overshoot issue
should be easy to check in advance.
The 12/91 date code on the transformer (unfortunately, the serial number
is still undisclosed) indicates a very early example of the E3610A that
was actually introduced in the 1992 catalog.
As by the 1992 catalog, there is a 10-turn voltage pot and a 1-turn
current pot. More recent versions have 10-turn current pots as does mine
from 1998. Also, it has U2 = LM340T (!), U4 = LF442CN, U5 = LM393N, U1 =
LF411CN, U3 = LM336.
Hope that helps.
Adrian
cfo schrieb:
I just bought a E3610A PSU on ebay , as defective.
Main problem right now is ... This seems to be an older revision
And has other comp values , than the "Schematic on the net"
Comp Item - Org Value - Inserted
value
R19 CC frontpanel Pot - 10 turn 10k - 1 turn 10K
U2 12v Regulator - MC7812CT - LM340T12
U4 Current OpAmp - LF442CN - LM1458N
U5 CC/CV Indicator - LM393CN - LM393N
U1 Voltage OpAmp - LF411CN - LM741EN
U3 Volt Ref - LM336-5.0 5.0v - LM329 6.9v
PCB PCB number - ??
C7 Pos. REF CAP - 330uF 50v - 330uF 50v
C13 Neg. REF CAP - 470uF 50v - 330uF 50v
I posted some pics here.
http://tinyurl.com/cn9p4s9
Does anyone have a schematic of a E3610A , that might have ie. LM1458 in
it or a 6.9v Ref , instead of a 5v Ref ?
Tia
CFO Denmark
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
On Thu, 14 Jun 2012 16:58:41 +0200, Adrian wrote:
There appears to be some massive contamination on the board, apparently
not only from a leaked electrolytic cap. It looks much like some unknown
liquid flooded a large area of the board and dried.
I do not see any reworked solder joints on the board, so the 'unusual'
components have to be original to the unit. Do not attempt to change the
circuit (replace components with values from a schematic that does not
match the given circuit exactly), otherwise you'll end up in a mess. You
may perform the service note changes though, given you check carefully
if they work for your unit. Especially the voltage overshoot issue
should be easy to check in advance.
The 12/91 date code on the transformer (unfortunately, the serial number
is still undisclosed) indicates a very early example of the E3610A that
was actually introduced in the 1992 catalog.
As by the 1992 catalog, there is a 10-turn voltage pot and a 1-turn
current pot. More recent versions have 10-turn current pots as does mine
from 1998. Also, it has U2 = LM340T (!), U4 = LF442CN, U5 = LM393N, U1 =
LF411CN, U3 = LM336.
Hope that helps.
Adrian
Hi Adrian
Thanx for the ansver.
I have come to the same result ....
That the parts are "original" mounted , and it's an early model.
I have already been recommended a 2'nd cleanup of the PCB ,
and after a 2'nd washdown with IPA , and a top-side resolder of all the
resistors in the PSU-Meter voltage divider section. The PSU volt meter is
actually stable , and is following the PSU-Output , quite nicely. I
verified by having my 34401A on the PSU-Output.
Now i'll wait for the new CAPS to arrive , and then calibrate it
according to the manual. First Current , and then voltage.
I don't have the Current cal. resistors specified in the manual , but i
just got an Agilent 6632B. Witch should be able to work as a variable
0..5 Amp load. Providing i can get it to do that (manual reading).
I actually think i have gotten the PSU to behave now.
Thanx for all the hints.
Ps: Current Calibration hints are welcome ...
CFO