Date   
Re: Tektronix 2430A occasionally fails some tests

Miguel Work
 

CCD KAPUT :(

-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de user920
Enviado el: jueves, 11 de julio de 2019 10:54
Para: TekScopes@groups.io
Asunto: [TekScopes] Tektronix 2430A occasionally fails some tests

Hello, I recently bought this oscilloscope as partially working, the owner said it worked fine but once it failed some tests (PA and TRIGS). At home, no errors appear and the scope seems to be working. While I was trying some signals using an android app for function generation, the signal disappeared from the screen. I proceeded to make the self diag and there were two fails (CCD and PA, all relative to gains). Here are the pictures: https://imgur.com/a/DNgRcPG After I restarted the scope, however, there were no errors and I continued to test the scope without trouble. I am not sure what the problem can be, if there is any. Do you have any ideas of what I can check? Thank you

Re: 7A26 Ch 1 gain low

Colin Herbert
 

I have looked at the Service Manual and cannot find anything about a gain adjustment between the channel switch and the output. However, on looking closer at the problematic 7A26, I think that the problem is not only with Ch 1, as the Variable gain control on Ch 2 doesn't give as much gain increase over the calibrated setting as do both channels on my "good" 7A26. It is about one half of a major division on the "good" 7A26.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Leon Robinson
Sent: 11 July 2019 19:03
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7A26 Ch 1 gain low

I havent messed with a 7A26 in some time but I think that there is a gain adjustment between the channel switch and the output that is set too low.



Sent from K5JLR

-------- Original message --------
From: "Colin Herbert via Groups.Io" <colingherbert=blueyonder.co.uk@groups.io>
Date: 07/11/2019 10:44 AM (GMT-06:00)
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7A26 Ch 1 gain low

Hi,
Yes, it does occur at other volts/div settings. I was quoting what I did to quantify the low gain in some way. The frequency was the "standard amplitude" 1kHz square-wave from my PG506.

As it happens, I have two 7A26 plug-ins (I like them) and swapping them around between the two vertical bays of my 7623A mainframe shows that the problem lies with the 7A26, not the mainframe or one of the bays. The "good" 7A26 shows an excess gain of about one half of a major division on both channels.

I was thinking, from a cursory inspection, that the ICs were soldered in, but I think this may not be the case on closer viewing. From what I can see of the markings on the ICs, the first three numbers differ, but then the next group of six numbers are "0078 10" followed by another group of two numbers and a letter. My service manual lists three types of ICs, the earlier ones were "SEL" for "selected" I am guessing. The later ones were designated 155-0078-10 and aren't "SEL". The 155-0078-10" are available on eBay. I might just buy a couple.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of David C. Partridge
Sent: 11 July 2019 11:47
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7A26 Ch 1 gain low

OK I'll make some guesses.

1. Have you checked that the output level from the attenuators is correct (same both channels)?

2. Does the problem occur at other volts/div settings?

3. What frequency signal are you testing with? Is the problem also present at DC?

4. You may be reduced to comparing signal levels on each channel through the various amplifier stage until you find one with low output. If you find one initially suspect any surrounding gain setting components, but equally could try swapping the ICs between channels.

HtH
David

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Colin Herbert via Groups.Io
Sent: 11 July 2019 11:03
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7A26 Ch 1 gain low

Doesn't anyone have any comments?

Colin.
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Colin Herbert via Groups.Io
Sent: 09 July 2019 13:20
To: TekScopes@groups.io
Subject: [TekScopes] 7A26 Ch 1 gain low

I have a 7A26 dual trace vertical amplifier with a Ch 1 gain problem. When trying to set the gain, I cannot set it correctly, as the GAIN adjust goes to fully clockwise but the trace on the CRT is a mm or so low. This is with the VOLTS/DIV at 10mV and a 20mV square wave from my PG506. The VOLTS/DIV VAR control won't go beyond this either. Ch 2 works fine, with about one small division of excess available using both the GAIN adjust and the VOLTS/DIV VAR. Anyone have any ideas?
TIA, Colin.

Re: Tektronix 2430A occasionally fails some tests

Bob Koller
 

Have you recapped the power supply? ALL of this model need to have ALL the small electrolytic caps replaced as a matter of course. Until the power supply is solid, you cannot be sure of any other problem.
Also, as you may know, you cannot operate this scope out of the case for more than a very few minutes without providing external airflow over the main board hybrids. Also, do not block the internal fan, as it cools the power supply.

When the PSU is known to be good with new caps, you have performed a Self Cal, and intermittent failures persist, one can consider a CCD or PA failure. It does occur occasionally in my experience of having worked on 100+ of the 24xx digital scopes.
You can swap the hybrids between the channels and observe if the problem follows. You can also try cleaning the hybrid connector contact fingers, sometimes this will correct a problem.

Re: 7603 Intensity control assembly 311-1404-00

NigelP
 

Interesting; I discovered that one of mine does actually switch off when you try hard enough! The other "working" one definitely does not. I always thought that this was just an indicative position for the primary intensity function knob and simply denoted minimum brightness, especially as the print "OFF" is in the same font as the intensity label and graduations.

Maybe this is one of the functions that goes wrong when the knobs get bashed in service...... they are rather exposed on that top corner.

Nigel G8AYM

Re: Tektronix 465

Abc Xyz
 

Hello

My recent aqusition of a 465B has a situation where Both Traces are too
Short for the Screen. Many hours of Troubleshooting and I cant figure out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...> wrote:

What part is lost and what isn't?



Re: 465B Square Wave problem

Abc Xyz
 

I have a 465B with Both Traces too Short...I have worked on it for hours
and seem to figure it out?!

951-551-3928

On Tue, Mar 12, 2019, 11:30 PM Timothy via Groups.Io <mustang_gt_y2k=
yahoo.com@groups.io> wrote:

I had to put this aside due to other things but during that time I kept
working on other electronics and have really learned a lot. I had been over
that scope with a fine tooth comb, I checked every component. I needed a
break. This scope like most 465s have been sitting. I had tried cleaning
the contacts with automotive MAF cleaner previous to all this, all I had on
hand that seemed reasonable. The problem was corrosion in the switches. I
finally broke down and bought a can of DeoxIT D5. This fixed the traces
corners. I didnt even need a calibrator to adjust them after that. Although
I now own a working cal pak. WooHoo!

I have this theme going where when sometimes I fix something, something
else breaks. My Beam Finder switch was damaged so I replaced it with a
donor. Now my traces are flickering intensity badly. not sure if its
related. Off to troubleshoot...



Re: Tektronix 465

Merchison Burke
 

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both Traces are too
Short for the Screen. Many hours of Troubleshooting and I cant figure out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...> wrote:

What part is lost and what isn't?




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This email has been checked for viruses by AVG.
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Re: Tektronix 465

Abc Xyz
 

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io <merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both Traces are too
Short for the Screen. Many hours of Troubleshooting and I cant figure out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...> wrote:

What part is lost and what isn't?





---
This email has been checked for viruses by AVG.
https://www.avg.com




Re: Tektronix 465

Abc Xyz
 

Both Traces are about four Graticules Short of a Full Screen...the Position
Knob in Full CW or CCW Rotation does not Resolve the Issue.
JR

On Fri, Jul 12, 2019, 10:16 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io <merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both Traces are
too
Short for the Screen. Many hours of Troubleshooting and I cant figure
out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...> wrote:

What part is lost and what isn't?





---
This email has been checked for viruses by AVG.
https://www.avg.com






Re: Tektronix 465

Abc Xyz
 

They Both seem to be Lost on the Right Hand Side of the Screen.

On Fri, Jul 12, 2019, 10:22 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Both Traces are about four Graticules Short of a Full Screen...the Position
Knob in Full CW or CCW Rotation does not Resolve the Issue.
JR

On Fri, Jul 12, 2019, 10:16 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io <merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both Traces are
too
Short for the Screen. Many hours of Troubleshooting and I cant figure
out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...> wrote:

What part is lost and what isn't?





---
This email has been checked for viruses by AVG.
https://www.avg.com








Re: Tektronix 465

Abc Xyz
 

I have been through the Horizontal Section with a Fine Tooth Comb. I have
Tested all the Transistors and they are Good. Only a Couple if Capacitors
and they dont appear to be Faulty. However, Voltages seem to be Out of Spec
throughout.
JR

On Fri, Jul 12, 2019, 10:24 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

They Both seem to be Lost on the Right Hand Side of the Screen.

On Fri, Jul 12, 2019, 10:22 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Both Traces are about four Graticules Short of a Full Screen...the
Position
Knob in Full CW or CCW Rotation does not Resolve the Issue.
JR

On Fri, Jul 12, 2019, 10:16 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io
<merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both Traces
are
too
Short for the Screen. Many hours of Troubleshooting and I cant
figure
out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...>
wrote:

What part is lost and what isn't?





---
This email has been checked for viruses by AVG.
https://www.avg.com










Re: 7A26 Ch 1 gain low

 

On Fri, Jul 12, 2019 at 02:23 PM, Colin Herbert wrote:


However, on looking closer at the problematic 7A26, I think that the problem
is not only with Ch 1, as the Variable gain control on Ch 2 doesn't give as
much gain increase over the calibrated setting as do both channels on my
"good" 7A26. It is about one half of a major division on the "good" 7A26.
... Which is what I suggested earlier: "I think that's not enough, meaning that overall gain for *both* channels isn't enough. Usually, there's at least half a major division headroom".

Raymond

Re: Tektronix 465

Paul Amaranth
 

How did you test the transistors? I've had situations where a simple
transistor checker said they were good but my curve tracer showed how
they were bad.

Paul

On Fri, Jul 12, 2019 at 10:32:37AM -0700, Abc Xyz wrote:
I have been through the Horizontal Section with a Fine Tooth Comb. I have
Tested all the Transistors and they are Good. Only a Couple if Capacitors
and they dont appear to be Faulty. However, Voltages seem to be Out of Spec
throughout.
JR

On Fri, Jul 12, 2019, 10:24 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

They Both seem to be Lost on the Right Hand Side of the Screen.

On Fri, Jul 12, 2019, 10:22 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Both Traces are about four Graticules Short of a Full Screen...the
Position
Knob in Full CW or CCW Rotation does not Resolve the Issue.
JR

On Fri, Jul 12, 2019, 10:16 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io
<merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both Traces
are
too
Short for the Screen. Many hours of Troubleshooting and I cant
figure
out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...>
wrote:

What part is lost and what isn't?





---
This email has been checked for viruses by AVG.
https://www.avg.com













!DSPAM:5d28c484224231887314200!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows

Re: Tektronix 465

Abc Xyz
 

I used one of those Digital Component Testers from China. And I used the
Swap Method. I don't have a Curve Tracer so I suppose one or more could be
Faulty.
JR

On Fri, Jul 12, 2019, 10:39 AM Paul Amaranth <paul@...> wrote:

How did you test the transistors? I've had situations where a simple
transistor checker said they were good but my curve tracer showed how
they were bad.

Paul

On Fri, Jul 12, 2019 at 10:32:37AM -0700, Abc Xyz wrote:
I have been through the Horizontal Section with a Fine Tooth Comb. I have
Tested all the Transistors and they are Good. Only a Couple if Capacitors
and they dont appear to be Faulty. However, Voltages seem to be Out of
Spec
throughout.
JR

On Fri, Jul 12, 2019, 10:24 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

They Both seem to be Lost on the Right Hand Side of the Screen.

On Fri, Jul 12, 2019, 10:22 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Both Traces are about four Graticules Short of a Full Screen...the
Position
Knob in Full CW or CCW Rotation does not Resolve the Issue.
JR

On Fri, Jul 12, 2019, 10:16 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io
<merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both
Traces
are
too
Short for the Screen. Many hours of Troubleshooting and I cant
figure
out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...>
wrote:

What part is lost and what isn't?





---
This email has been checked for viruses by AVG.
https://www.avg.com













!DSPAM:5d28c484224231887314200!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows



Re: Tektronix 465

Harvey White
 

Does the beam finder switch have any effect?

Some of the contacts may be stuck.

Voltages may change under beam finder mode.

Harvey

On 7/12/2019 1:32 PM, Abc Xyz wrote:
I have been through the Horizontal Section with a Fine Tooth Comb. I have
Tested all the Transistors and they are Good. Only a Couple if Capacitors
and they dont appear to be Faulty. However, Voltages seem to be Out of Spec
throughout.
JR

On Fri, Jul 12, 2019, 10:24 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

They Both seem to be Lost on the Right Hand Side of the Screen.

On Fri, Jul 12, 2019, 10:22 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Both Traces are about four Graticules Short of a Full Screen...the
Position
Knob in Full CW or CCW Rotation does not Resolve the Issue.
JR

On Fri, Jul 12, 2019, 10:16 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io
<merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both Traces
are
too
Short for the Screen. Many hours of Troubleshooting and I cant
figure
out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...>
wrote:
What part is lost and what isn't?



---
This email has been checked for viruses by AVG.
https://www.avg.com








Re: Tektronix 465

Abc Xyz
 

The Beam Finder seems to Work Properly.


951-551-3928

On Fri, Jul 12, 2019, 11:19 AM Harvey White <madyn@...> wrote:

Does the beam finder switch have any effect?

Some of the contacts may be stuck.

Voltages may change under beam finder mode.

Harvey



On 7/12/2019 1:32 PM, Abc Xyz wrote:
I have been through the Horizontal Section with a Fine Tooth Comb. I have
Tested all the Transistors and they are Good. Only a Couple if Capacitors
and they dont appear to be Faulty. However, Voltages seem to be Out of
Spec
throughout.
JR

On Fri, Jul 12, 2019, 10:24 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

They Both seem to be Lost on the Right Hand Side of the Screen.

On Fri, Jul 12, 2019, 10:22 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Both Traces are about four Graticules Short of a Full Screen...the
Position
Knob in Full CW or CCW Rotation does not Resolve the Issue.
JR

On Fri, Jul 12, 2019, 10:16 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io
<merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both Traces
are
too
Short for the Screen. Many hours of Troubleshooting and I cant
figure
out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...>
wrote:
What part is lost and what isn't?



---
This email has been checked for viruses by AVG.
https://www.avg.com











Re: Tektronix 465

Paul Amaranth
 

Then you're going to have to do it the hard way and figure out why you're
voltage readings are off. You may have a leaky transistor or faulty IC
somewhere.

With the position knob centered, are the traces equally short on each side
or more on one side or the other?

Paul

On Fri, Jul 12, 2019 at 10:43:30AM -0700, Abc Xyz wrote:
I used one of those Digital Component Testers from China. And I used the
Swap Method. I don't have a Curve Tracer so I suppose one or more could be
Faulty.
JR

On Fri, Jul 12, 2019, 10:39 AM Paul Amaranth <paul@...> wrote:

How did you test the transistors? I've had situations where a simple
transistor checker said they were good but my curve tracer showed how
they were bad.

Paul

On Fri, Jul 12, 2019 at 10:32:37AM -0700, Abc Xyz wrote:
I have been through the Horizontal Section with a Fine Tooth Comb. I have
Tested all the Transistors and they are Good. Only a Couple if Capacitors
and they dont appear to be Faulty. However, Voltages seem to be Out of
Spec
throughout.
JR

On Fri, Jul 12, 2019, 10:24 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

They Both seem to be Lost on the Right Hand Side of the Screen.

On Fri, Jul 12, 2019, 10:22 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Both Traces are about four Graticules Short of a Full Screen...the
Position
Knob in Full CW or CCW Rotation does not Resolve the Issue.
JR

On Fri, Jul 12, 2019, 10:16 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io
<merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both
Traces
are
too
Short for the Screen. Many hours of Troubleshooting and I cant
figure
out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <stephlan@...>
wrote:

What part is lost and what isn't?





---
This email has been checked for viruses by AVG.
https://www.avg.com














--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows






!DSPAM:5d28c6e5224588803550606!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows

Re: Tektronix 465

Abc Xyz
 

I changed one of the IC's...no change. The Traces seem Normal to the Left
but Short 4 Graducles to the Right.

On Fri, Jul 12, 2019, 12:03 PM Paul Amaranth <paul@...> wrote:

Then you're going to have to do it the hard way and figure out why you're
voltage readings are off. You may have a leaky transistor or faulty IC
somewhere.

With the position knob centered, are the traces equally short on each side
or more on one side or the other?

Paul

On Fri, Jul 12, 2019 at 10:43:30AM -0700, Abc Xyz wrote:
I used one of those Digital Component Testers from China. And I used the
Swap Method. I don't have a Curve Tracer so I suppose one or more could
be
Faulty.
JR

On Fri, Jul 12, 2019, 10:39 AM Paul Amaranth <paul@...> wrote:

How did you test the transistors? I've had situations where a simple
transistor checker said they were good but my curve tracer showed how
they were bad.

Paul

On Fri, Jul 12, 2019 at 10:32:37AM -0700, Abc Xyz wrote:
I have been through the Horizontal Section with a Fine Tooth Comb. I
have
Tested all the Transistors and they are Good. Only a Couple if
Capacitors
and they dont appear to be Faulty. However, Voltages seem to be Out
of
Spec
throughout.
JR

On Fri, Jul 12, 2019, 10:24 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

They Both seem to be Lost on the Right Hand Side of the Screen.

On Fri, Jul 12, 2019, 10:22 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Both Traces are about four Graticules Short of a Full
Screen...the
Position
Knob in Full CW or CCW Rotation does not Resolve the Issue.
JR

On Fri, Jul 12, 2019, 10:16 AM Abc Xyz via Groups.Io <yawrdanza=
gmail.com@groups.io> wrote:

Yes...the Power Supplies are Spot On with No Ripple.

On Fri, Jul 12, 2019, 10:14 AM Merchison Burke via Groups.Io
<merchison=
yahoo.co.uk@groups.io> wrote:

Have you checked the power supplies as described in the
manual?



On 2019-Jul-12 12:02 PM, Abc Xyz wrote:
Hello

My recent aqusition of a 465B has a situation where Both
Traces
are
too
Short for the Screen. Many hours of Troubleshooting and I
cant
figure
out
why?!
JR
951-551-3928

On Tue, May 7, 2019, 1:28 PM Steph L <
stephlan@...>
wrote:

What part is lost and what isn't?





---
This email has been checked for viruses by AVG.
https://www.avg.com














--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows






!DSPAM:5d28c6e5224588803550606!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows



Re: Tektronix 465

 

On Fri, Jul 12, 2019 at 09:08 PM, Abc Xyz wrote:


I changed one of the IC's...
- What IC's did you change? AFAUIK, the horizontal output amplifier in the 465(B) contains no IC's.
- Do you have a 465 or a 465B? You mention both.
- Are you sure that both horizontal plates (underside of 'scope) are connected?

Raymond

Re: Tektronix 465

Abc Xyz
 

The Scope is a 465B. Even Textronix, and others, said there was no IC in
the Horizontal Section. The IC I Replaced was: U4269 (Schematic Location:
5D,2D,6G and 2G. Board Location: 5I, Component No: AU4269, Tektronix Part
No: 256-0197-00, Serial No: B010100 B039319, Name & Description:
Microcircuit, LI:5 Transistor Array, Mfr Code: 80009, Mfr Part No:
156-0197-00).
I have Checked Both Connections to the CRT Horizontal Plates.
JR
951-551-3928

On Fri, Jul 12, 2019, 12:18 PM Raymond Domp Frank <@Raymond>
wrote:

On Fri, Jul 12, 2019 at 09:08 PM, Abc Xyz wrote:


I changed one of the IC's...
- What IC's did you change? AFAUIK, the horizontal output amplifier in
the 465(B) contains no IC's.
- Do you have a 465 or a 465B? You mention both.
- Are you sure that both horizontal plates (underside of 'scope) are
connected?

Raymond