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Re: 2246 Flex PCB Interconnect - How Do You Disconnect Them Without Damaging Them?

Roger Evans
 

I hope someone will correct me if this is incorrect, I repaired a 2245A a couple of years ago which I then sold on. If these are the white ribbon cables with no obvious moulded on end connectors then they are just a push fit and need a little release agent such as IPA before pulling them out either with fingers or long nose pliers, trying to grip as much of the width of the cable as possible.

Beware the snap fit plastic connectors holding some of the boards together, particularly the front panel processor board. You need to _exactly_ reverse the disassembly sequence or the plastic locking button will break off!

Regards,

Roger


Re: Tektronix 465 Scope

Michael W. Lynch
 

On Sun, Apr 18, 2021 at 05:23 PM, Raymond Domp Frank wrote:




No “B”.
That makes it a Guernsey-produced instrument and a rather late one at that.
Non-US (i.e. non-B) numbers cannot be cross-referenced to applicable serial
numbers in the SM’s, which are all US (Beaverton-) related.
One of the most frustrating things when working on a Non-Beaverton Instrument. I ran into this myself when working on my Guernsey built 465 and a pair of Heerenveen built 468's.

--
Michael Lynch
Dardanelle, AR


Re: Tektronix 465 Scope

Bill
 

Thank you!! Yes it was a typo.
Bill


Re: Tektronix 465 Scope

Tom Lee
 

In cases where it is difficult to trace a signal from its point of origin forward, it may be easier to trace backward from some point downstream. Most likely you are looking for a shorted tantalum, and those stand out. A few quick ohmmeter measurements, and you’ll identify which are connected across the problem supply.

Just a thought, should obtaining a proper manual prove difficult.

— Tom

Sent from my iThing, so please forgive typos and brevity.

On Apr 18, 2021, at 4:49 PM, Bill via groups.io <ko4nrbs=yahoo.com@groups.io> wrote:

Page 174 in the 465 Service manual is the schematic of the scope's power supply.

On page 168 just underneath R1460 (Potentiometer) you can see R1463, CR1465, VR1414 and R1441. On my scope there are only two resistors in that spot and no diode.

Will just have to go hand over hand until I find the bad component on the -8vdc rail. My old 453 has an excellent manual but the manual is for it's serial number.

Bill





Re: Tektronix 465 Scope

Dave Peterson
 

Bill,

I presume you are looking at the early service manual, as "Fig 7-17 P/O A9 Interface circuit board" matches your description.

I think you have a typo: you meant VR1441?

Your description more closely matches the "SN B250000 & UP" service manual, "CRT Circuit" and "Fig 8-14 A9 - Interface circuit board".

I think Raymond is right, you have a Gurnsey (?) built scope, and the serial number does not fit the Beaverton "B" serial numbers distinguishing "early" and "later" constructions. I think you're describing the layout as depicted in the later service manual:

https://w140.com/tekwiki/images/5/55/070-1861-00.pdf

I'm still relatively new myself. I sometimes speak as if I know what I'm talking about. But this is what I think is going on.

Dave


Re: 492P signal amplitude error and error 58

Attilio
 

Is the YIG oscillator the 1st LO ?
Unfortunately I don't have a power meter to measure the power-level out of the YIG oscillator.
I could take a spare 1st LO and try to replace it.

--Cheers
Attilio


Re: Tektronix 465 Scope

Bill
 

Page 174 in the 465 Service manual is the schematic of the scope's power supply.

On page 168 just underneath R1460 (Potentiometer) you can see R1463, CR1465, VR1414 and R1441. On my scope there are only two resistors in that spot and no diode.

Will just have to go hand over hand until I find the bad component on the -8vdc rail. My old 453 has an excellent manual but the manual is for it's serial number.

Bill


Re: Tektronix 465 Scope

Bill
 

No it is a 465.
Bill


Re: Tektronix 465 Scope

Tom Lee
 

Ah, thanks, Raymond.

Sent from my iThing, so please forgive brevity and typos

On Apr 18, 2021, at 15:23, Raymond Domp Frank <hewpatek@gmail.com> wrote:

On Mon, Apr 19, 2021 at 12:07 AM, Bill wrote:


No “B”.
That makes it a Guernsey-produced instrument and a rather late one at that. Non-US (i.e. non-B) numbers cannot be cross-referenced to applicable serial numbers in the SM’s, which are all US (Beaverton-) related.

It’s not a 465B by any chance? The faceplate should show it.

Raymond





Re: Tektronix 465 Scope

 

On Mon, Apr 19, 2021 at 12:07 AM, Bill wrote:


No “B”.
That makes it a Guernsey-produced instrument and a rather late one at that. Non-US (i.e. non-B) numbers cannot be cross-referenced to applicable serial numbers in the SM’s, which are all US (Beaverton-) related.

It’s not a 465B by any chance? The faceplate should show it.

Raymond


Re: Tektronix 465 Scope

Tom Lee
 

Are you sure about that?

Sent from my iThing, so please forgive brevity and typos

On Apr 18, 2021, at 15:07, Bill via groups.io <ko4nrbs=yahoo.com@groups.io> wrote:

No “B”.
Bill





Re: Tektronix 465 Scope

Bill
 

No “B”.
Bill


Re: Tektronix 465 Scope

 

On Sun, Apr 18, 2021 at 07:39 PM, Bill wrote:


Anyone have a service manual that covers a 465 scope serial number 107659
Is that B107659?

Raymond


7L14 for sale

Michael Perkins
 

I have a 7L14 in excellent shape for sale. If interested, I can send pictures of the unit operating. I have not used it much in the last 8 years, but it works well. I will consider offers , but reserve the right to ignore low - ball offers. I'm looking for $950.00 for the instrument.Mike


some classic HP 38/48 calculators added to stuff season

 

More clean up from my office, some mint 38G, 48S and 48SX hp
calculators added to the stuff season page, have a look here:
https://www.sphere.bc.ca/test/stuffday.html#hpfans

I am happy with just my model 20S at this point.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.


Re: 492P signal amplitude error and error 58

ulf_r_k
 

I am sorry to hear that replacing U1050 and U2050 did not help.

What is the power-level out of the YIG oscillator?

BR

Ulf Kylenfall


Re: Tektronix 465 Scope

Bill
 

I will do that later today. Found it frustrating to try and trace the circuits when components are not where they are supposed to be.
Bill


Re: Tektronix 465 Scope

Dave Peterson
 

Interesting. I've been trying to sort out these intermediate scopes myself.

I have a pre-SN250K scope, but it appears to be mostly constructed of post SN250K boards, except for the vertical amplifier which is a mix of early and later constructions.

Have you tried using the schematic and layout of the post-SN250K manual? My experience has been that it is a good match to my SN177k scope. There are also component variations just due to the rapid evolution of some design details during this period for 465 construction. But the actual PCB seems consistent. Just the details of component stuffing can vary in small ways.

Can you put up a picture of the PS section of the A9 board you're dealing with?

Dave

On Sunday, April 18, 2021, 11:01:24 AM PDT, Bill via groups.io <ko4nrbs=yahoo.com@groups.io> wrote:

I found that manual but unfortunately it doesn't match up with my scope.
Thank you,
Bill


Re: 492AP screen dump

nj902
 

John,

I will add my thanks to you here also.

Your toolkit has been a great help to me in my personal quest to "learn things"

Your SA trace program enabled me to use TIA tools to evaluate the spectral power density and adjacent channel performance of various digital voice modulation formats.

I am sure that there are many like me using your toolkit in amateur and personal applications that wouldn't be possible if the only alternatives were the expensive commercial products.

Thanks again


Re: Tektronix 465 Scope

Bill
 

I found that manual but unfortunately it doesn't match up with my scope.
Thank you,
Bill

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