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Re: Tek 2465b with down shifted display..

 

What you wont easily find in your reading is that ALL Tektronic service manuals have an error in the placement of C1115 and C1132.  In particular, they swap the positions of these two capacitors.  So, if you follow the service manual PCB placement map you will erroneously install the low voltage C1115 replacement into the high voltage C1132 position, the replacement C1115 will fail and the PSU will not work after the re-cap.  Most of us replace caps according to what we remove, not according to the service manual, and do not encounter this problem.  But it has happened, at least twice that I know of.

On ‎Saturday‎, ‎January‎ ‎6‎, ‎2018‎ ‎10‎:‎11‎:‎00‎ ‎AM‎ ‎CST, Mark Hatch <mark2382@...> wrote:

Thank you Siggi, Harvey, Chuck and others for your suggestions and support!

Lots of good articles on power supply re-cap. Have some reading ahead of me before I grab my soldering iron. :-)

Mark


Re: Tek 2465b with down shifted display..

Mark Hatch
 

Thank you Siggi, Harvey, Chuck and others for your suggestions and support!

Lots of good articles on power supply re-cap. Have some reading ahead of me before I grab my soldering iron. :-)

Mark


Re: TDS520 Option 13

Siggi
 

On Sat, 6 Jan 2018 at 04:22 jafinch78 . <jafinch78@...> wrote:

Do you have an image or schematic?


Re: Tek 2465b with down shifted display..

Siggi
 

On Sat, Jan 6, 2018 at 01:02 Mark Hatch <mark2382@...> wrote:

I am happy to report that this problem was a U400 failure. Popped in a
replacement U400, and the distortion went away. The readout is back at the
top and the wave form can be moved top to bottom without distortion.

Nice, congrats on fixing’er, and we now have a video of what kinda thing
you’d expect for U400 failure.



I still want to check the power supply. There is good reason to be
suspicious of it.... I also got to look at that NVRAM....
While you’re in there, replace the SMD electrolytics on the A5 board. They
tend to leak and mess up the DAC reference components and the PCB. This is
the #1 cause of trouble for these scopes, and it’s a lot less trouble and
expense to prevent than to fix. The DAC reference resistor(s) are 0.1% and
low tempco, so might be a PITA to find.


Re: DM501 repair [Solved]

satbeginner
 

New link to my pictures, now on Groups.io: https://groups.io/g/TekScopes/album?id=13047


Re: DM501 repair [Solved]

satbeginner
 

Hi all,

As a follow up on this repair:

I ordered the 74LS47 on Aliexpress (China) and that, in combination with the Spanish postal service usually doing not too much between mid december and mid january, it was only yesterday when I received them.

The good news: Display is now restored to its normal function, and also, the new 74LS47 is not getting warm anymore like the broken one did.

Now I will have to start working on my 2465B with the 06 (CTT) option..... it started to give a FAIL 84 0C at power on....

Always fun,

Un saludo,

Leo


Re: TDS520 Option 13

jafinch78 .
 

Do you have an image or schematic?


Re: TDS520 Option 13

BRYAN SWAN
 

The option 13 board contains only a few chips and wit the data sheets for the chips the cct can easily be drawn out. What you need to do is make up the conversion cable that allows the option 13 board to be used on the diag port to stream out the info on tests run during power up and calibration.


Re: Tek 2465b with down shifted display..

Raymond Cote
 

It may be mechanically induced shifting.

Women and cats will do as they please, and men and dogs should just relax and get use to the idea.

-Robert Heinlein

On Jan 6, 2018, at 00:02, Mark Hatch <mark2382@...> wrote:

I am happy to report that this problem was a U400 failure. Popped in a replacement U400, and the distortion went away. The readout is back at the top and the wave form can be moved top to bottom without distortion.

I still want to check the power supply. There is good reason to be suspicious of it.... I also got to look at that NVRAM....

Thanks all!

Mark



Re: Tek 2465b with down shifted display..

Mark Hatch
 

I am happy to report that this problem was a U400 failure. Popped in a replacement U400, and the distortion went away. The readout is back at the top and the wave form can be moved top to bottom without distortion.

I still want to check the power supply. There is good reason to be suspicious of it.... I also got to look at that NVRAM....

Thanks all!

Mark


Re: TDS520 Option 13

jafinch78 .
 

On Fri, Jan 5, 2018 at 12:48 pm, Artekmedia wrote:


070-8567-00
I'll keep you posted if I find a copy.

Tektronix is going to research for me over the weekend to see if they can find.

I did find the Option 2F manual though when searching the TDS-820


Re: TDS520 Option 13

ArtekManuals
 

I have no idea... I have never seen a copy

Maybe you should try  your friend at the chat desk

-DC

On 1/5/2018 4:48 PM, jafinch78 . wrote:
On Fri, Jan 5, 2018 at 12:48 pm, Artekmedia wrote:

070-8567-00
Does 070-8567-00 contain schematics?


--
Dave
Manuals@...
www.ArtekManuals.com


Re: TDS520 Option 13

jafinch78 .
 

On Fri, Jan 5, 2018 at 12:48 pm, Artekmedia wrote:


070-8567-00
Does 070-8567-00 contain schematics?


Re: Source of manuals either .pdf or hard copy

Malcolm Hunter
 

Hi Paul,



On 5 January 2018 at 21:30, <pauledst@...> wrote:

I'm looking for manuals for my model 506 oscilloscope. It's a member of
the 561 family and somewhat uncommon. It uses 9 series plugins and some 3
series ( I already have all the 3 series ones.) Any help is appreciated.

Paul
​Did you check out the service manual at
http://w140.com/tek_506_Manual_070-445_Aug_1964.pdf ? Interesting, it's the
same age as me.

Malc


Re: Source of manuals either .pdf or hard copy

Brian
 

Hi Paul , the BAMA archive has a pdf of the 9A1


Source of manuals either .pdf or hard copy

pauledst@...
 

I'm looking for manuals for my model 506 oscilloscope. It's a member of the 561 family and somewhat uncommon. It uses 9 series plugins and some 3 series ( I already have all the 3 series ones.) Any help is appreciated.

Paul


TDS520 Option 13

ArtekManuals
 

For option 13, the TDS520 Service Manuals is once again quite clear on this.

_*Option 13: RS232/Centronics Hardcopy Interface*_

With this option , Tektronix ships the oscilloscope equipped with a RS-232 .
and a Centronics interface that can be used to obtain hardcopies of the oscilloscope screen.
For service information, refer to the /*TDS  Family Option 13 RS-232/Centronics Interface*//*
*//* Instruction Manuals*/, Tektronix part number 070-8567-00

-DC
manuals@...





--
Dave
Manuals@...
www.ArtekManuals.com


Re: TDS-520

jafinch78 .
 

On Fri, Jan 5, 2018 at 10:55 am, Raymond Domp Frank wrote:


all modules in the 'scope (from A10 up) are present in Volume 2
I wasn't sure if all the option boards data was present though, at least the Option 13 which I don't have isn't. Option 1M appears present. I wonder where the Option 13 board schematic is found?

I've been reading the VGA and RS232 can be made by soldering onto the A11 board. I'm not thinking a RS232 to TTL USB is needed since I'm thinking the chips on the A11 board would output in RS232 standard from that era. Would be interesting though to have the module to convert to USB since I read all are RS232. That would be a novel hack/mod. for an auto calibration/performance verification to be logged into an audit trail app.

I still have to figure this out... though the VGA may be from somewhere around or on J5. Maybe down the line further where the CRT connects, though a CRT to LCD converter video card may be needed then.

I'm not sure where the pinouts would be for the RS232 yet.

Thanks everyone!


Re: TDS-520

jafinch78 .
 

On Fri, Jan 5, 2018 at 10:38 am, Raymond Domp Frank wrote:


0 Ohm in reality does not exist:
I wasn't sure also if there is some limit for calling 0 Ohm... zero. Like are the lowest resistors 0.00001 Ohm?

I might of been having one of those invalid thought moments with the Ohm's Power Law's too.

I was also thinking with temperature maybe the material used changes resistance. Like some sort of RTC, NTC or Thermal Coefficient effects.

I like the jumpers idea somewhat to get some more versatility potential out of these scopes.

I'm still reading into the potential with the TDS-520 board(s) and stock components. I haven't even gotten into spec'ing all the different chips out to see what others can be used to like the Tektronix support noted "Frankenstien" the scope out. :-).

Looks like option 1M can be implemented with 128k SRAM chips replacing the 32k on the A11 board and maybe the 8k on the A10 board to at least 32k or maybe even 128k. I'm wondering if who had this before me was experimenting with removing the resistors to see what model configuration potential there was. I'm thinking the firmware is going to be limiting this also.

Thanks for clarifying Raymond!


Re: TDS-520

 

I would not be surprised if there never was a "Component Level Diagnostic and Repair Manual, Volume 1". I have a "Service Manual, Volume1", ref. # 070-8312-01. My Component Level Diagnostic and Repair Manual is ref. # 070-8313-00.
Looking at the Block Diagram (in my manual page 171, first page in chapter Schematics), all modules in the 'scope (from A10 up) are present in Volume 2.

Raymond