Re: Tek 2230 - Storage does not work.
I am trying to trouble shoot the missing storage traces. Does anyone have the DC voltage levels for Pin 6 and 11 of a working U2101 (MO36E). I am seeing +5.6 Volts which seems intuitively wrong give the 511 Ohm to -5 Volts.
For that matter with a 1Khz 1V sin wave applied to chan 1 set to .5 V per. What should I see on 2 and 15 and 12 and 13?
Thanks for your help!
David
toggle quoted message
Show quoted text
--- In TekScopes@..., David <davidwhess@...> wrote:
The "storage channel switch" is a multiplexor and amplifier IC just
before the digitizer. It is not the storage mode button on the front
of the oscilloscope. I doubt the storage channel switch is the
problem but the vertical signal chain that goes through it should be
checked if the vertical position controls are not the problem.
There are two 4 pin flat cables which carry the channel 1 and channel
2 analog signals to the storage channel switch and if one falls off it
can cause the problem you describe but that would also cause the
readout to be displaced vertically so I do not think that is the
problem.
I never found a 2230 service manual to download. I ended up buying
the Artek Media PDF on CD and it was definately worth the price.
The 2230 that I repaired is pretty much my main oscilloscope.
On Thu, 19 Jan 2012 16:01:46 -0000, "david_s5y" <david_s5@...>
wrote:
The trace if off screen in a vertical direction. But it is a flat line and will disappear when moved.
I think you may be onto something with the switch. The scope sat for a long time in high humidity and dust. The traces disappear when I begin to press the switch.
Do you know where I can download the service manual?
David
--- In TekScopes@..., David <davidwhess@> wrote:
I asked about this some time ago and as far as I know, the battery
only backs up the waveform storage which is part of either optional
interface board. None of the various settings persist across power
cycles. You might expect that with the optional battery backed up
memory, the oscilloscope would store its settings there but it does
not.
Is it possible that the trace if off screen in a vertical direction?
That could be a problem with the vertical signal chain through the
storage channel switch or the analog and digital registration
calibration. The vertical position controls are a little weird in
this design since they work in both the analog and digital domains
simultaneously. The oscilloscope reads them to adjust the digital
display to match up with future samples.
If the service manual procedure "Adjust Acquisition Position Offset"
on page 5-11 checks out, then I think the problem will be in the
vertical signal chain leading up to the digitizer.
On Thu, 19 Jan 2012 03:30:04 -0000, "david_s5y" <david_s5@>
wrote:
Sorry to be unclear: By the Acc table I ment the ACQ_MODE_SETUP_TABLE/SELECT_MODE table.
So it is not supposed to persist across power cycles?
The big issues is the missing traces once I press Store. Some times I can move the V positions for the channel and see the trace, but it is a flat line, that soon disappear again.
--- In TekScopes@..., David <davidwhess@> wrote:
Acc Table?
As far as I know, none of the settings are retained when powered down.
There is no calibration data to save either.
You changed the battery on the option card, right? I believe that
only backs up the waveform storage.
On Thu, 19 Jan 2012 03:13:08 -0000, "david_s5y" <david_s5@>
wrote:
I have an Tektronix 2230 Storage scope. Everything appears to work except for the storage.
The unit passes diagnostics. I replaced the NV battery, but it does not remember the Acc Table setting and when switched to Store the traces all disappear (but the display Delta V, time base etc are all there).
Anyone had a similar problem? Any guidance would be appreciated.
David
|
Re: Aluminum panels wanted
Thanks Guys. I have panels coming on a trade deal.
Jerry Massengale
jmassen418a@...
toggle quoted message
Show quoted text
-----Original Message-----
From: Chris Moore
To: TekScopes
Sent: Wed, Jan 25, 2012 5:34 am
Subject: Re: [TekScopes] Re: Aluminum panels wanted
?
Hi Jerry,
Why couldn't you use a blank electrical box cover from lowes hardware? Cut to size of course.
Chris
--- On Wed, 1/25/12, Jerry Massengale <jmassen418a@...> wrote:
From: Jerry Massengale <jmassen418a@...>
Subject: Re: [TekScopes] Re: Aluminum panels wanted
To: TekScopes@...
Date: Wednesday, January 25, 2012, 4:03 PM
?
Hi,
I know what you are talking about. I have a couple but want something cheaper for resale. Thanks.
jerry
-----Original Message-----
From: Heinz-Peter Deutsch < hpdeutsch@...>
To: TekScopes < TekScopes@...>
Sent: Wed, Jan 25, 2012 4:39 am
Subject: [TekScopes] Re: Aluminum panels wanted
?
Tek No 016-0155-00
----------------------------------------------
What are blind panels? Where do you get them?
Jerry Massengale
jmassen418a@...
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
|
|
Re: Aluminum panels wanted
Hi Jerry,
Why couldn't you use a blank electrical box cover from lowes hardware? Cut to size of course.
Chris
|
--- On Wed, 1/25/12, Jerry Massengale wrote:
From: Jerry Massengale
Subject: Re: [TekScopes] Re: Aluminum panels wanted
To: TekScopes@...
Date: Wednesday, January 25, 2012, 4:03 PM
?
Hi,
I know what you are talking about. I have a couple but want something cheaper for resale. Thanks.
jerry
Jerry Massengale
jmassen418a@...
-----Original Message-----
From: Heinz-Peter Deutsch
To: TekScopes
Sent: Wed, Jan 25, 2012 4:39 am
Subject: [TekScopes] Re: Aluminum panels wanted
?
Tek No 016-0155-00
----------------------------------------------
What are blind panels? Where do you get them?
Jerry Massengale
jmassen418a@...
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
|
Re: Power supply problem with Tek 2220
Tektronix 2230, identical to 2220, less a few switch options, working, voltage across R907 0.23Volts
JC
toggle quoted message
Show quoted text
--- In TekScopes@..., "Tan Chor Ming" <jonray03@...> wrote:
Hi Tom,
Thank you for the detail of the problem which is similar to my tek 2220.
I am still unable to nail down the problem. I believe the scope is working
normally, because when it fires up it works normally.
My feeling is that it poorly designed thermally for 230V operation
Do you have voltage measurement for tek 2235 on R907?
I am getting 0.198V (with the +5V to the storage board disconnected,
effectively turning off the storage function).
This means that without the storage function connection, the current on +43V
is slightly below 1A.
I am not sure if this is a normal condition but it should be similar to the
tek 2235.
Under this condition, the scope could operate for quite a while without
problem
Once the +5V is connected to the storage board, voltage at R907 goes up to
2.3V~2.5V or about 1.15 to 1.25A on +43 and the power supply will shut down.
Following done with little effect or improvement
- Change 3 filter caps (only those that are feels hot) - C960, C962, C964
(for -5V for 2220 only)
- Change NMOS P9070. When changing P9070, I used a separate heatsink for
P9070 and still such down happens which means it is unlikely to be caused by
the thermal shutdown board.
- Shutdown is more likely cause by spurious overload in R907
- Change C907
- Change CR907 (two diode in parallel)
- Added C919 with 1000pf in parallel. Lowered switching freq but still
having a heated P9070 which shuts down. Not sure what freq but it is
definitely audible.
Rgds,
Chor Ming
_____
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of tom jobe
Sent: Monday, January 23, 2012 11:17 PM
To: TekScopes@...
Subject: Re: [TekScopes] Re: Power supply problem with Tek 2220
|
Re: Aluminum panels wanted
On 01/25/2012 10:03 AM, Jerry Massengale wrote: Tek No 016-0155-00 Hi,
I know what you are talking about. I have a couple but want something cheaper for resale. Thanks. You mentioned polycarbonate could do. What about specifying a laser cutting pattern to make them instead of buying them?
|
Re: Aluminum panels wanted
Hi,
I know what you are talking about. I have a couple but want something cheaper for resale. Thanks.
jerry
Jerry Massengale
jmassen418a@...
toggle quoted message
Show quoted text
-----Original Message-----
From: Heinz-Peter Deutsch
To: TekScopes
Sent: Wed, Jan 25, 2012 4:39 am
Subject: [TekScopes] Re: Aluminum panels wanted
?
Tek No 016-0155-00
----------------------------------------------
What are blind panels? Where do you get them?
Jerry Massengale
jmassen418a@...
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
|
Re: Aluminum panels wanted
Tek No 016-0155-00
----------------------------------------------
What are blind panels? Where do you get them?
Jerry Massengale
jmassen418a@...
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
|
OT: Wavetek 5809A bandwidth
Anybody knows what is the bandwidth for Wavetek 5809A spectrum analyzer?
|
Re: Aluminum panels wanted
to fill/close empty plugin front space
maybe i will find the tek part number again
got where, i got mine from ebay
Peter
=====================================
Hi,
What are blind panels? Where do you get them?
Jerry Massengale
jmassen418a@...
toggle quoted message
Show quoted text
-----Original Message-----
From: Heinz-Peter Deutsch <hpdeutsch@...>
To: TekScopes <TekScopes@...>
Sent: Tue, Jan 24, 2012 1:06 pm
Subject: [TekScopes] Re: Aluminum panels wanted
mmh, the second time a text vanished ?
In my own (yahoo) return copy, the text was there.
After i tried to send the text again - gone ???
strange behavior ...
-------------------------------
Ok, here it come again:
i said, why you don't use empty (blind) panels
Peter
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
|
Re: Aluminum panels wanted
Hi,
What are blind panels? Where do you get them?
Jerry Massengale
jmassen418a@...
toggle quoted message
Show quoted text
-----Original Message-----
From: Heinz-Peter Deutsch
To: TekScopes
Sent: Tue, Jan 24, 2012 1:06 pm
Subject: [TekScopes] Re: Aluminum panels wanted
?
mmh, the second time a text vanished ?
In my own (yahoo) return copy, the text was there.
After i tried to send the text again? - gone ???
strange behavior ...
-------------------------------
Ok, here it come again:
i said, why you don't use empty (blind) panels
Peter
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
|
Re: 155-0242-01: Hybrid decapsulated
I published two photos from the those 3 silicon chips inside. One driver, two similar power amps. Will try to get bigger magnification, localize the failure...
Cheers! CT1DGN
The LINK:
toggle quoted message
Show quoted text
--- In TekScopes@..., Jerry Massengale <jmassen418a@...> wrote:
Jose,
Great pics. Thank you.
jerry
Jerry Massengale
jmassen418a@...
-----Original Message-----
From: viagioz <viagioz@...>
To: TekScopes <TekScopes@...>
Sent: Fri, Dec 16, 2011 9:08 am
Subject: [TekScopes] 155-0242-01: Hybrid X-Ray Photos
HI frinds,
I share with you the inside from TEK24xx Z Axis Hybrid:
At this level investigation everything seems to be OK inside (the 3 die attach, bounding...)
It is related with the subject "2465B no trace".
I try now to borrow an hybrid to be sure it is the source of the problem.
Then I will remove the ceramic attached underneath and I will share with you microscope pictures.
Nice weekend, maybe Merry Christmas! I will not get the new hybrid before next year, I guess!
73'
Jose
CT1DGN
|
Re: Back to soldering ceramic terminal strips
Nice work reclaiming those ceramic strips. What a simple solution. I imagine that it would be best to clean the ceramic very well prior to gluing.
|
Paging ArtekMedia -Update requests OFF LIST PLEASE
If you emailed in the last two weeks and did not receive? a reply ,
please email me direct today.
DO NOT PLACE REQUESTS THROUGH TEKSCOPES !!!!! :-)
I will be chained to the computer all day today and tomorrow trying
to get caught up
Dave
ARTEKMEDIA
On 1/25/2012 6:45 AM, Heinz-Peter Deutsch wrote:
?
Dave,
did you received my mails, too ??
Or are they gone to nirwana .....
Peter
===========================================
Dave et all
We at Artekmedia alive and well...but buried in a host of
issues.
I would suggest if you made a request in the last two
weeks and have
received no reply that you resend ..Dave Casey in
particualr I do not
see anything recent from you ..please resend
Sorry all for the inconvenience
Dave
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
--
Dave & Lynn Henderson
Manuals@...
PO Box 175
Welch,MN 55089
|
Heinz
...please resend
Dave
On 1/25/2012 6:45 AM, Heinz-Peter Deutsch wrote:
?
Dave,
did you received my mails, too ??
Or are they gone to nirwana .....
Peter
===========================================
Dave et all
We at Artekmedia alive and well...but buried in a host of
issues.
I would suggest if you made a request in the last two
weeks and have
received no reply that you resend ..Dave Casey in
particualr I do not
see anything recent from you ..please resend
Sorry all for the inconvenience
Dave
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
--
Dave & Lynn Henderson
Manuals@...
PO Box 175
Welch,MN 55089
|
Dave,
did you received my mails, too ??
Or are they gone to nirwana .....
Peter
===========================================
Dave et all
We at Artekmedia alive and well...but buried in a host of issues.
I would suggest if you made a request in the last two weeks and have
received no reply that you resend ..Dave Casey in particualr I do not
see anything recent from you ..please resend
Sorry all for the inconvenience
Dave
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro!
|
Dave et all
We at Artekmedia alive and well...but buried in a host of issues.
?Been flying back and forth to Florida twice a week trying to get my
mother in-law placed in an assisted living facility ( Alzheimer's).
I have a couple of consulting clients as well that I spend two days
a week with here in MN ergo the need to fly back and forth .? I
think I will likely be back in the office here in MN now for at
least two weeks. To add insult to injury I appear to be having ISP
problems as I am sporadically missing whole "blocks" of email. I got
back yesterday and will start digging out today ..there seems to be
about 700 emails to sort through so the volume is beyond anything I
can reasonably sort through with a smart phone on road. :-P
I would suggest if you made a request in the last two weeks? and
have received no reply that you resend ..Dave Casey in particualr I
do not see anything recent from you ..please resend
Sorry all for the inconvenience
Dave
On 1/24/2012 11:55 PM, Dave Casey wrote:
?
Speaking of Artek, has
anyone heard from Dave lately? His last post was on the
7th. I'm trying to spend my money with him and as yet
I've not heard back.
?
Dave Casey
--
Dave & Lynn Henderson
Manuals@...
PO Box 175
Welch,MN 55089
|
Quote: Back to the +50V supply: It's a little risky, but I'd suggest to remove Q876, monitor the +50V output with your DVM, and power-up the scope. ...
I agree.?
For the next step, I would simply pull connectors P900/P901, then bridge the sense feedback with the respective supply, and measure the supply rails again. This requires only five connections and P900/P901 are in close proximity, so the connections are easy.? This is a linear power supply, not a switched mode supply, so operation with no load does not harm anything.
I would also pull P971/P962.
Doing so disconnects the power supply from its loads and allows isolation of the trouble to a specific circuit / board by re-connecting one board after one.?
Just keep going, David - one step at a time. We will bring this beauty back to life.
Cheers,
Magnus
|
me too.
?
hope Dave is ok.
?
-Don
From: Dave Casey To: TekScopes@...
Sent: Tuesday, January 24, 2012 11:55 PM
Subject: [TekScopes] Paging Artek Media
?
Speaking of Artek, has anyone heard from Dave lately? His last post was on the 7th. I'm trying to spend my money with him and as yet I've not heard back.
?
Dave Casey
|
Re: Back to soldering ceramic terminal strips
--- In TekScopes@..., "Stan & Patricia Griffiths" <w7ni@...> wrote:
I have pretty good results when I solder-suck the notches dry and use new
silver-bearing solder in them.
If you have some bad strips, I have quite a lot of new ones and ones I have
salvaged with a solder sucker. You can find them in my Parts Shop.
Stan
_____
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of phosphorphile
Sent: Monday, December 19, 2011 2:32 PM
To: TekScopes@...
Subject: [TekScopes] Re: Back to soldering ceramic terminal strips
Hi David,
As I'm still learning good technique for reworking ceramic terminal strips
I'm hyper-concerned about wrecking the scopes I work on. The one I'm
restoring now has been worked over quite a bit by a trouble-shooter who
lifted wires and components here, there, and everywhere chasing down
problems. My inclination is to, like with convetional terminals, wick out
the nasty old solder and make a new, shiny soldering job, the idea being to
restore the orignal beautiful work done by Tek. I'm finding that approach to
be ephemeral at best. So now I wick off only excess solder and then reflow
with a bit of the silver bearing stuff. I get mixed results, still too much
leaching of the silver plating in the strip notches. Someone said it's nigh
impossible to avoid that so I guess the terminals, bright an idea it was by
Tek, is really a one shot proposition.
Stan has Tek solder spools for sale on his website so now my solder hunt is
done.
Arden
--- In TekScopes@... <mailto:TekScopes%40yahoogroups.com> ,
David <davidwhess@> wrote:
I have a spool of the Radio Shack 62/36/2 that I bought years ago and
while it is thin, there is certainly enough to do a reasonable number
of connections if you do not overdo it. The thin size is because it
is intended for surface mount parts that use silver metalization.
The only real electronics store here in the St. Louis area
() has an old bin full of the Kester
62/36/2 solder tubes but their inventory management is not good enough
for them to be listed online. For the price, I think it was about the
same value as the Radio Shack silver solder. They are certainly less
expensive online even with shipping.
This seems reasonable although it is no clean flux instead of
activated rosin:
oll-/380118400075?pt=LH_DefaultDomain_0
<
Roll-/380118400075?pt=LH_DefaultDomain_0&hash=item5880d27c4b>
&hash=item5880d27c4b
That 4% low temperature silver solder (not the lead free stuff) from
Parts Express would no doubt be better but sure is expensive. Better
to use the 2%, extra flux if necessary, and use a good lower
temperature soldering iron.
On Sun, 18 Dec 2011 01:14:32 -0000, "phosphorphile"
<gumbear@> wrote:
Well, gentlemen, you made me do it. I rose to the challenge and dropped
by the local RS. No 62/36/2 on its hook. The computer said they had
two in stock. Shoplifted, no doubt. But while looking over the
shoulder of the store clerk (yes, that's what they used to be called) I
asked what the specs were. 0.015 dia., came the reply. Worthless! Too
small for soldering ceramic terminal strip notches. You'd put half a
spool into one notch if you cleaned it out and refilled it. $3.00 a tie
point is a bit too much. Not much better, the stuff I got from MCM,
Kester made 0.020 dia. for about half what RS sells theirs for but no
bargain because I had to pay shippijng. So the hunt goes on for 0.031
or thereabouts, ....TekScopers shall not be forgot!
Confirmed. While Xmas shopping yesterday at the Sherman Oaks Mall in LA I stopped in at the Radio shack and found two Radio Shack part #
65-035 for $6 each. I bought them both....
Hello. Watch this:
|
Re: Power supply problem with Tek 2220
Hi Tom,
Thank you for the detail of the problem
which is similar to my tek 2220.
?
I am still unable to nail down the
problem.? I believe the scope is working normally, because when it fires
up it works normally.?
My feeling is that it poorly designed thermally
for 230V operation
?
Do you have voltage measurement for tek
2235 on R907?
I am getting 0.198V (with the +5V to the
storage board disconnected, effectively turning off the storage function).
This means that without the storage
function connection, the current on +43V is slightly below 1A.?
I am not sure if this is a normal
condition but it should be similar to the tek 2235.?
Under this condition, the scope could
operate for quite a while without problem
?
Once the +5V is connected to the storage
board, voltage at R907 goes up to 2.3V~2.5V or about 1.15 to 1.25A on +43 and
the power supply will shut down.
?
Following done with little effect or
improvement
- Change 3 filter caps (only those that
are feels hot) ¨C C960, C962, C964 (for -5V for 2220 only)
- Change NMOS P9070.? When changing
P9070, I used a separate heatsink for P9070 and still such down happens which
means it is unlikely to be caused by the thermal shutdown board.
- Shutdown is more likely cause by
spurious overload in R907
- Change C907
- Change CR907 (two diode in parallel)
- Added C919 with 1000pf in
parallel.? Lowered switching freq but still having a heated P9070 which
shuts down.? Not sure what freq but it is definitely audible.
?
Rgds,
Chor Ming
?
toggle quoted message
Show quoted text
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of tom jobe
Sent: Monday, January 23, 2012
11:17 PM
To: TekScopes@...
Subject: Re: [TekScopes] Re: Power
supply problem with Tek 2220
?
?
Hi Tan,
This morning I remembered about an interesting 2235 repair that was done by
a very crafty person by the name of Irwin Zosa during 2007 and 2008.
Irwin lives in your part of the world in the Philippines where it is almost
as hot as in Singapore.
His basic problem was the same as yours, the 2235
would shut itself down with a thermal problem.
There was not much interest in his 2235 problem on Tekscopes at that time,
so the email exchanges we had went off group as he worked his way through
the problem. Once he had the problem solved, he posted a nice summary of his
findings to the Tekscopes group.
Irwin's repair summary is in message number 36518 and it was posted on Jan
6, 2009.
He found a number of problems as he went along, but his final discovery
might amaze you.
It sure amazed me because I would have never found it!
tom jobe...
PS I will paste in Irwin's 2235 repair summary below to save you the trouble
of getting it from the Tekscopes Message archive.
Hello to all: Way back in the first quarter of 2007, I had this
problem of my 2235 shutting down after a few minutes from switching
it ON. After a lot of interaction from forum members I finally
nailed down the problem. Here is a brief summary of this process:
First, I checked all the voltages according to the service manual and
they were OK. I also checked the ESR of the capacitors and they read
good but the unit being about twenty years old or so, I decided to
replace the secondary caps (C960, C961, C962, C963, C968, C970) with
ultra-low ESR, 105-degree C Nichicons. I could not find 840uF units
so I used 1000uF. The problem still did not go away although the
length of time-to-shutdown increased. I also replaced the FET
switcher Q9070 (IRF710)with a higher rated device (IRF840). I then
replaced Q946 and Q947 with TIP41 units. At every change that I
made, slight improvements were observed. I also replaced R912 (357
Ohms)with a 390 Ohm part to increase the shutdown threshold of this
2235. Then I replaced the secondary rectifiers CR954, CR955 (MR814),
CR956, CR957 (MR812), CR960, CR961, CR962, CR963 (MR812). The
replacements that I used were the MUR160 ultra-fast rectifiers. All
of these were not done "shotgun" style and in the exact order as
described but rather, followed logical steps of checking one section
at a time. I even thought of thermal runaway because T944, T948, and
Q9070 would heat up so much (really hot!). I also noticed early on
that the frequency of the pre-regulator section (U930) was about
72KHz and in the service manual it is listed as about 60KHz. It
suddenly dawned on me to try to reduce the operating frequency of
this section so I replaced R919 and now it is running at 60KHz. The
excessive heat has gone and no more shutdown. I tried to run the
scope for about half a day and still no shutdown. This 2235 has all
of the power supply improvements already installed from the factory
(but why was the pre-regulator section running at 70KHz ?). I would
like to thank the forum members who gave their insights. Special
thanks goes to Tom Jobe, who stayed with me all the way in this
repair project. He took the time to take measurement readings for
me, gave his analyses, and even offered parts that I may need for
free. At some point I was considering another brand of oscilloscope
but I held on to this (even keeping it in storage for almost a year
because of this problem) because from my research, these TEK scopes,
during their time, were among the best. I think they still are.
|
mescalero