hi David,
thx for the tip! i will check this as soon as possible (couple days out of town). i check tp444 before with ext. trigger and that was very small compared to the input signal. don't know the exact amplitude but much lower.
probably back on saturday. tjeenz.
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Show quoted text
--- In TekScopes@..., David <davidwhess@...> wrote:
I would start by looking at TP444 (middle of schematic 4) which should
be a duplicate of the trigger input signal as selected by the source
and coupling controls. At the very least, there should be a 60Hz sine
wave at that point when the trigger source is set to line.
Then I would check pin 2 of U460B which should be a duplicate of the
tri.gger level voltage as set by the trigger level control. In Auto
mode this voltage will be between the peak levels of the trigger
signal but in normal mode, it should be between +0.65V and -0.65V.
It would be nice to have a nicer scan of the service manual. I
extracted and cleaned up schematic 4 from the one available online:
On Tue, 18 Sep 2012 11:00:41 -0000, "tjeenz" <tjeenz@...> wrote:
Hi,
Have a trigger problem with a 2213 tektronix.
In auto and line trigger i have a baseline. In norm not. Also ext. trigger fails (signal from function generator 4v pp and ch1 on 1v/div)
cannot get still image to see frequency, amplitude is ok. with signal on one of the channels, trig in auto i can almost get still image if freq is low enough with var hold-off. trig-level does nothing. Also the trigger led never blinks.
Checked all p.s. voltages. Are ok (no ripples), but according to service manual there should be some specific resistance on the voltages. These are way too low in my scope:
8.6v 114 ohm at tp500= 58 ohm
+8.6v 95 ohm at W975 = 16 ohm
+5v 330 ohm at W985 = 16 ohm
+30v 905 ohm at W965 = 16 ohm
+100v 12.5 kohm at W966 = 16 ohm
so i guess something is wrong somewhere. checked the big capacitors in the p.s, for 30V and +8.6V, both were in spec.
Are these resistance values in the manual a good reference for finding the faulty area?
regards, tjeenz
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Re: New to group - Just acquired a R7844
On 09/19/2012 05:06 PM, k4mt wrote: I have used scopes my whole life but not one like this. Am still trying to learn how to use it I like 'em. They're complicated though, since they;re two scopes in one box... You put in two vert amps and 2 time bases and the time bases can be set to different triggering and speeds. Literally 2 in one, and with a trace separation horiz. adjust on the displayed signal after triggering for comparing. Very useful. -- Ecosensory
|
Re: New to group - Just acquired a R7844
You got a great deal. I am partial to 7844 for whatever reason. The R and
the none R version share the same manual. It and the manuals for the
plug-ins you got are on Bama or TEK-wiki. (just Google "Tektronix 7844 pdf"
, etc.
If you are partial as I am to printing portions of the manual. I highly
recommend getting Dave's CD's. Much higher quality and better suited for
printing 11*17 as I like to do. Good bang for the buck.
Some call the 7844 complex in operating. However, if you envision each trace
(they lay out top to bottom on the 7844 controls) as a separate oscilloscope
90% of what you will do will be extremely straight forward and intuitive.
Congratulations...
Rob
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-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of k4mt
Sent: Wednesday, September 19, 2012 5:06 PM
To: TekScopes@...
Subject: [TekScopes] New to group - Just acquired a R7844
Hi All:
I just found a working R7844 with 7A26, 7A24, and two 7B85 plugins. I was in
a pawn shop and saw it on a shelf in the back room. I asked the owner and he
said it had been sitting there for 5 years and he did not know what it was.
He brought it down and I powered it up. Nice bright traces and ran a wire to
calibrator output and all channels worked.
The best news is he wanted it off his shelf and asked me for an offer. Just
for laughs I offered him $40.00 and he couldn't say yes quick enough. (guess
I should have offered $20.00).
I have used scopes my whole life but not one like this. Am still trying to
learn how to use it as I have no users manual. Was able to use it this
weekend to troubleshoot my Ham radio PLL with a 60 Mhz output that my old
scope could hardly see. What a great piece of test gear!
------------------------------------
Yahoo! Groups Links
|
New to group - Just acquired a R7844
Hi All:
I just found a working R7844 with 7A26, 7A24, and two 7B85 plugins. I was in a pawn shop and saw it on a shelf in the back room. I asked the owner and he said it had been sitting there for 5 years and he did not know what it was. He brought it down and I powered it up. Nice bright traces and ran a wire to calibrator output and all channels worked.
The best news is he wanted it off his shelf and asked me for an offer. Just for laughs I offered him $40.00 and he couldn't say yes quick enough. (guess I should have offered $20.00).
I have used scopes my whole life but not one like this. Am still trying to learn how to use it as I have no users manual. Was able to use it this weekend to troubleshoot my Ham radio PLL with a 60 Mhz output that my old scope could hardly see. What a great piece of test gear!
|
Re: San Diego 7934 and goodies
Does a vertical amp anything useful together with a 7D20 in a 4-bay mainframe?
Not that the 7D20 in a 7934 makes all that much sense to start with.....
Looks like a bit of a mix, but should be a good deal if you can use
only some of the items.
I really wonder if the curve tracer those fixtures go with is anywhere nearby.
The current probe(s) would also be interesting.
ST
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On Wed, Sep 19, 2012 at 8:09 PM, sipespresso <sipespresso@...> wrote: I have no affiliation with the seller. I emailed them an confirmed that they are asking for $160.
-Kurt
------------------------------------
Yahoo! Groups Links
|
San Diego 7934 and goodies
I have no affiliation with the seller. I emailed them an confirmed that they are asking for $160.
-Kurt
|
Fun things to do with a TDS-360
--
Dave Henderson
Manuals@...
www.Artekmanuals.com
PO Box 175
Welch,MN 55089
651-269-4265
|
Re: Apology Re: Free for postage: Tektronix C1001 video camera, anyone?
Peace be with you, all is forgiven.
Don Black.
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On 19-Sep-12 11:54 AM, Brad Thompson wrote: Hello--
Please accept my apology-- I had no intention of responding
to the entire group instead of Gerhard.
73--
Brad AA1IP
------------------------------------
Yahoo! Groups Links
|
Re: AFG2020 Parts Help (ComLinear)
Thanks, I will ask for a quote.? Based on the datasheet, it looks like this part may be very expensive! ? Rich ?
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From: TekScopes@... [mailto:TekScopes@...] On Behalf Of David DiGiacomo
Sent: Wednesday, September 19, 2012 12:48 AM
To: TekScopes@...
Subject: Re: [TekScopes] AFG2020 Parts Help (ComLinear)? ? Looks like the CLC561 is available from utsource.net, but you'll have
to ask for a quote.
|
I've got a Tek2205 which has been dropped and abused by the previous owner (I believe it's from a lab and the workers there did it to the scope when the lab was closing down). However the inside of the scope is almost new and very clean, everything works fine except the traces become distorted.
see video:
After I opened it up I have found this:
What a shame!
My question is that what Tek (or other brand) CRT can be used to replace the broken one? If repairing it is not economically viable I will offer it to people need parts to repair their Tek2205.
Thanks in advance
|
Re: Free for postage: Tektronix C1001 video camera, anyone?
Hello Brad,
?
I sent you an email
?
regards
Gerhard
?
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Show quoted text
----- Original Message -----
Sent: Wednesday, September 19, 2012 3:40
AM
Subject: Re: [TekScopes] Free for
postage: Tektronix C1001 video camera, anyone?
?
On 9/18/2012 1:50 PM, GKupka wrote:
> Hello Brad,
> How much
are the shippimg costs to germany with USPS priority mail?
> Many
thanks.
> Gerhard
>
Hello, Gerhard--
Thank you for your
inquiry regarding the Tektronix C1001 camera.
Shipment via USPS
international Priority mail, in a
medium-size flat-rate carton will cost
$47.95, to which I would
add $3.00 to cover the PayPal fee and minor
shipping expenses.
I haven't had an opportunity to photograph the
camera and may attempt
to use a flat-bed optical scanner if it produces a
decent image.
Let me know if you're no longer interested, and thank
you.
73--
Brad AA1IP
|
Re: AFG2020 Parts Help (ComLinear)
Not sure if you can get one here, but you can get 5.? I've used the source before without problems:? http://www.ic-on-line.cn/search.php?part=CLC561AI&stype=part
|
--- On Tue, 9/18/12, Rich Miller wrote:
From: Rich Miller Subject: [TekScopes] AFG2020 Parts Help (ComLinear)
To: TekScopes@...
Date: Tuesday, September 18, 2012, 9:39 PM
?
Hello All: ? I am trying to repair CH1 on an AFG2020 I acquired some time ago. I have isolated the problem to a ComLinear CLC561AI amplifier located on the A42 output board. I cannot seem to find this part anywhere online.? I wonder if someone may have one of these they would be willing to part with. If not, I would also consider taking a complete A42 Board with the hope this IC works. ? Any help on a source would be much appreciated! ? Thanks ? Rich, AJ3G
|
Re: AFG2020 Parts Help (ComLinear)
Looks like the CLC561 is available from utsource.net, but you'll have
to ask for a quote.
|
I have attached the horizontal amplifier schematics (both for high &
low serial numbered units) & the A/B trigger generator schematic.
These are the missing pages from the manual that is available for
download.
|
Apology Re: Free for postage: Tektronix C1001 video camera, anyone?
Hello--
Please accept my apology-- I had no intention of responding
to the entire group instead of Gerhard.
73--
Brad AA1IP
|
Re: Free for postage: Tektronix C1001 video camera, anyone?
On 9/18/2012 1:50 PM, GKupka wrote: Hello Brad,
How much are the shippimg costs to germany with USPS priority mail?
Many thanks.
Gerhard
Hello, Gerhard-- Thank you for your inquiry regarding the Tektronix C1001 camera. Shipment via USPS international Priority mail, in a medium-size flat-rate carton will cost $47.95, to which I would add $3.00 to cover the PayPal fee and minor shipping expenses. I haven't had an opportunity to photograph the camera and may attempt to use a flat-bed optical scanner if it produces a decent image. Let me know if you're no longer interested, and thank you. 73-- Brad AA1IP
|
AFG2020 Parts Help (ComLinear)
Hello All: ? I am trying to repair CH1 on an AFG2020 I acquired some time ago. I have isolated the problem to a ComLinear CLC561AI amplifier located on the A42 output board. I cannot seem to find this part anywhere online.? I wonder if someone may have one of these they would be willing to part with. If not, I would also consider taking a complete A42 Board with the hope this IC works. ? Any help on a source would be much appreciated! ? Thanks ? Rich, AJ3G
|
Re: tektronix 177 test fixture pin spacing
?
Hi George,
I forgot to attach the knob pictures, sorry about that!
tom jobe...
?
?
?
?
?
----- Original Message -----
Sent: Tuesday, September 18, 2012 1:41
PM
Subject: Re: [TekScopes] tektronix 177
test fixture pin spacing
?
Gang,
I¡¯ve taken Tom¡¯s dimensions and converted them to a scale
PDF. ?I then printed the 1:1 drawing on a laser printer, cut it out, and
dropped it on top of a 177 test fixture to test the accuracy of the drawing.
?Using two consecutive images as different Photoshop layers I was able to
set the opacity of the paper cut out to see how it compares to the actual
location of the holes on the test fixture. ?I uploaded a series of
pictures to TekScopes.
?
<>?
?
The
full scale PDF was uploaded to TekScopeArc2. ?If you print it out be sure
to set ¡®Scale¡¯ to none.
?
?
George
On Sep 18, 2012, at 8:16 AM, Glydeck < glydeck@...> wrote:
?
Tom,
Perfect! Just what is needed. I'll share a full scale PDF later
today.
George
Sent from my iPad
?
Better living through chemistry? ;-)
Mark
On 09/17/2012
08:45 PM, Rob wrote:
>
>
> Dang Tom, you do better
freehand then I can in AutoCAD¡. good thing I
> remain in
chemicals...
>
> *From:* TekScopes@...
[mailto:TekScopes@...]
> *On Behalf Of *Tom Jobe
> *Sent:* Monday, September 17,
2012 6:21 PM
> *To:* TekScopes@...
>
*Subject:* Re: [TekScopes] tektronix 177 test fixture pin spacing [1
> Attachment]
>
> *[Attachment(s) <#TopText> from
Tom Jobe included below]*
>
>
> George,
>
>
In case my explanation didn't make sense, here is a quick sketch of
> the dimensions of the 577/177 test fixture
layout.
>
> Everything is in inches.
>
>
tom
>
>
>
>
|
FW: [TestEquipTrader] Old Tek Scope and plug-ins
FYI - I have no affiliation ...
Dave
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-----Original Message-----
From: TestEquipTrader@... [mailto:TestEquipTrader@...] On Behalf Of captcurt@...
Sent: 18 September 2012 18:25
To: TestEquipTrader@...
Subject: [TestEquipTrader] Old Tek Scope and plug-ins
Before I junk part these out, perhaps there are some Tek collectors that need them.
For Sale: Tektronix RM561A Rack Mount scope. Dirty but seems to be fully functional.
Collection of various plug-in modules for this scope.
4ea 2A63 Differential Amp
1e 3A72 Dual Trace Amp
3ea 2B67 Timebase ( one black Face)
1ea 3B3 Delayed TimeBase
1ea 3A7 Differential Comparator
1ea 3A6 Dual Trace Amp
1ea 3A1 Dual Trace amp
All Dirty but all there and they appear to have basic function. Not fully tested.
If there is interest, I will fire up and test further.
See pictures here:
Would like to make a package deal for pickup in 48150, SE Michigan.
Or let me know what you need.
Maybe $50 for the scope and 25 ea for the plug-ins?
Thanks
Curt
------------------------------------
Yahoo! Groups Links
|
Re: tektronix 177 test fixture pin spacing
Gang,
I¡¯ve taken Tom¡¯s dimensions and converted them to a scale PDF. ?I then printed the 1:1 drawing on a laser printer, cut it out, and dropped it on top of a 177 test fixture to test the accuracy of the drawing. ?Using two consecutive images as different Photoshop layers I was able to set the opacity of the paper cut out to see how it compares to the actual location of the holes on the test fixture. ?I uploaded a series of pictures to TekScopes.
?
<>?
?
The full scale PDF was uploaded to TekScopeArc2. ?If you print it out be sure to set ¡®Scale¡¯ to none.
?
?
George
On Sep 18, 2012, at 8:16 AM, Glydeck < glydeck@...> wrote:
?
Tom,
Perfect! Just what is needed. I'll share a full scale PDF later today.
George
Sent from my iPad
?
Better living through chemistry? ;-)
Mark
On 09/17/2012 08:45 PM, Rob wrote:
>
>
> Dang Tom, you do better freehand then I can in AutoCAD¡. good thing I
> remain in chemicals...
>
> *From:* TekScopes@... [mailto:TekScopes@...]
> *On Behalf Of *Tom Jobe
> *Sent:* Monday, September 17, 2012 6:21 PM
> *To:* TekScopes@...
> *Subject:* Re: [TekScopes] tektronix 177 test fixture pin spacing [1
> Attachment]
>
> *[Attachment(s) <#TopText> from Tom Jobe included below]*
>
>
> George,
>
> In case my explanation didn't make sense, here is a quick sketch of
> the dimensions of the 577/177 test fixture layout.
>
> Everything is in inches.
>
> tom
>
>
>
>
|
David C. Partridge
Glydeck