2440 and 2465B battery/ram replacement


Bob Albert
 

Chuck, where are you?  I am in Los Angeles and would like to find someone who is willing to get my Tek 2440 working.  Maybe that's not you.
The history is that when I got it, it worked but would not hold settings on power off.  I decided it must need new NVRAM modules and swapped in some I got from China on ebay.  Now the scope doesn't work at all.  I swapped one module back but still no joy.  It turns on but the display is messed up and it won't respond to any controls.
I would like to find someone who is smarter than I who is willing to correct my mistakes and get the scope operational again.  If you can assist in any way I would appreciate it.  I am willing to pay a reasonable amount, as well.
Thanks, Bob

On Friday, March 26, 2021, 07:24:54 PM PDT, Chuck Harris <cfharris@erols.com> wrote:

Hi Mark,

I am always willing to do the work.  Contact me
off group.

-Chuck Harris


On Fri, 26 Mar 2021 15:45:26 -0700 "Mark Vincent"
<orangeglowaudio@gmail.com> wrote:
Reinhard,

      I have seen this site. It is great. I do NOT have a programmer
or access to one. I do NOT have ANY TM500/5000 anything. I do not
know anyone locally that has these. This is why I asked here to see
if anyone will do the work.

Mark





Chuck Harris <cfharris@...>
 

Hi Mark,

I am always willing to do the work. Contact me
off group.

-Chuck Harris


On Fri, 26 Mar 2021 15:45:26 -0700 "Mark Vincent"
<orangeglowaudio@gmail.com> wrote:
Reinhard,

I have seen this site. It is great. I do NOT have a programmer
or access to one. I do NOT have ANY TM500/5000 anything. I do not
know anyone locally that has these. This is why I asked here to see
if anyone will do the work.

Mark





Mark Vincent
 

Reinhard,

I have seen this site. It is great. I do NOT have a programmer or access to one. I do NOT have ANY TM500/5000 anything. I do not know anyone locally that has these. This is why I asked here to see if anyone will do the work.

Mark


n49ex
 

Not sure how many times I will need to post this on the forum, but here's Hugo Holden"s brilliant do-it-yourself battery/ram replacement with new technology:
http://worldphaco.com/uploads/TEKTRONIX_2465b_OSCILLOSCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf

And, yes, no matter how it's done, unless one has the means to read the old chip data and program it into the new, you will need to go through the full cal procedure. Probaly a good idea anyway given passage of time....

Reinhard


Mark Hatch
 

Mark,

Reach out to Chuck Harris on this list. He replaced my NVRAM. Not sure if he would do just a board or well he needs the whole scope, but you can ask him.

Mark


Szabolcs Szigeti
 

Hi Mark,

I can't help in replacing the RAMs, but I have some experience with the
2440/2432 etc DSOs. Don't be afraid to replace the RAM without saving it's
content, it is much easier to get calibrated than the 2465.
The first time I calibrated a 2440 I used a DC supply, and an old, low end
function generator's square wave output. Since then I have much improved
instruments, but it was possible to get it calibrated with minimum
equipment.
Especially, that if it is has not been calibrated for long you will
probably need to do an internal adjustment and readjust the screen geometry
and the CCD timing anyway (for that you'll need some kind of a signal
generator) which requires clearing the nvram as a first step, so there is
absolutely no need to save the ram or worry about losing its content. There
is absolutely no point in saving and reloading the old data.

Szabolcs


Mark Vincent <orangeglowaudio@gmail.com> ezt írta (időpont: 2021. márc.
26., P, 2:45):

I have both of these and would like to get these replaced with the new
style of chip that does not need the back-up battery. The (real) 2465B is
still good. I do not know how long it will keep the data before becoming
dead. The 2440 needs replacing. I know these original devices will go bad
soon. I do not have or access to a programmer. I know I have the newer A5
board in the B with S/N 063838 (1994). I am in the mid-Atlantic area of the
US. The caps and resistors in both have already been done. Mr. Yachad's
2465B site was used. Thank you Mr Yachad. I do not know what I would send.
The whole piece, board, what. Is there anyone willing to do this and give
me a price on these? I do not know if calibration is needed after the chip
replacement. I know enough people in this group are good to expert at using
and knowing the 2465B features. I got this one because of the praise it
gets.

The 2440 I have used some. The B is recent and I need to learn the
features. This is new to me. I am used to the 7000 series and older. The
2440 has some FAIL modes. I think the CCDs are good. It likely needs
calibration to clear the fail. This one still shows signals like should. I
know I need to learn what all this one can do when it is working right.

I have adjusted the power supplies to within a couple of mV to exact
of the adjustments on each scope. I do this on other models as well.

If anyone wants to contact in private, you can use the email. I will
give my telephone number in a private email if any want it. That is a much
faster way to get me and discuss anything necessary.

Mark






Bob Albert
 

Mark, it never occurred to me to ship my 2440 board to someone willing to replace the NAVRAM modules.  If someone would do this for a reasonable price I would love to go that way.
What happened was that I replaced my modules and the scope stopped working.  Maybe the new modules are bad or maybe I screwed up the installation.  But that's the situation I am in and would love to have someone fix the board.
Bob K6DDX

On Thursday, March 25, 2021, 06:45:56 PM PDT, Mark Vincent <orangeglowaudio@gmail.com> wrote:

    I have both of these and would like to get these replaced with the new
style of chip that does not need the back-up battery. The (real) 2465B is
still good. I do not know how long it will keep the data before becoming
dead. The 2440 needs replacing. I know these original devices will go bad
soon. I do not have or access to a programmer. I know I have the newer A5
board in the B with S/N 063838 (1994). I am in the mid-Atlantic area of the
US. The caps and resistors in both have already been done. Mr. Yachad's
2465B site was used. Thank you Mr Yachad. I do not know what I would send.
The whole piece, board, what. Is there anyone willing to do this and give
me a price on these? I do not know if calibration is needed after the chip
replacement. I know enough people in this group are good to expert at using
and knowing the 2465B features. I got this one because of the praise it
gets.

    The 2440 I have used some. The B is recent and I need to learn the
features. This is new to me. I am used to the 7000 series and older. The
2440 has some FAIL modes. I think the CCDs are good. It likely needs
calibration to clear the fail. This one still shows signals like should. I
know I need to learn what all this one can do when it is working right.

    I have adjusted the power supplies to within a couple of mV to exact
of the adjustments on each scope. I do this on other models as well.

    If anyone wants to contact in private, you can use the email. I will
give my telephone number in a private email if any want it. That is a much
faster way to get me and discuss anything necessary.

Mark


Mark Vincent
 

I have both of these and would like to get these replaced with the new
style of chip that does not need the back-up battery. The (real) 2465B is
still good. I do not know how long it will keep the data before becoming
dead. The 2440 needs replacing. I know these original devices will go bad
soon. I do not have or access to a programmer. I know I have the newer A5
board in the B with S/N 063838 (1994). I am in the mid-Atlantic area of the
US. The caps and resistors in both have already been done. Mr. Yachad's
2465B site was used. Thank you Mr Yachad. I do not know what I would send.
The whole piece, board, what. Is there anyone willing to do this and give
me a price on these? I do not know if calibration is needed after the chip
replacement. I know enough people in this group are good to expert at using
and knowing the 2465B features. I got this one because of the praise it
gets.

The 2440 I have used some. The B is recent and I need to learn the
features. This is new to me. I am used to the 7000 series and older. The
2440 has some FAIL modes. I think the CCDs are good. It likely needs
calibration to clear the fail. This one still shows signals like should. I
know I need to learn what all this one can do when it is working right.

I have adjusted the power supplies to within a couple of mV to exact
of the adjustments on each scope. I do this on other models as well.

If anyone wants to contact in private, you can use the email. I will
give my telephone number in a private email if any want it. That is a much
faster way to get me and discuss anything necessary.

Mark