Here is the 2465a battery replacement pics, I was thinking b series I guess. Same as the 2430 before the a. sorry for the mixup. So far so good on the 2430a it still percolating along and doing fine. I would try a good battery before the recal route, you may have enough old battery to retain the settings. My 2430 did with the new coin cell temporary I was able to get the data from the old chip, all I got on the screen was jibberish with the almost dead cell. It was like 1.2v and giving errors before I got the new chips it was totally unusable as far as a scope. Good luck and I hope you get them all up and running.
Sent from Mail for Windows 10
From: Chuck Harris
Sent: Tuesday, May 29, 2018 1:41 PM
To:
[email protected]Subject: Re: [TekScopes] New to me Tek 2465A DM - Not Getting Waves
2465A scopes don't have a Dallas NVRAM at all. They use
a low power CMOS RAM chip, and a lithium cell battery with
all of the associated power control circuitry.
If you want to retain your calibration constants, you must
connect about 3V worth of battery power to the diode that
is in series with the + terminal of the lithium cell, to
ground before unsoldering the old cell, and maintain the
power until you have soldered the new cell in place.
-Chuck Harris
Alan Halls wrote:
Thank you Dewey and John. I started going through the PDF you linked and my
setup looked a little different. Here is a photo of the right side and
bottom of my scope. It has a Keeper battery which should be replaceable,
but then I am not sure which IC we are talking about replacing /
reprogramming since I don't see a Dallas chip anywhere. Do I need to dig in
deeper or is this not what you expected?
Alan
On Sat, May 26, 2018 at 6:14 PM, Dewey Wyatt <kn4wddewey@...> wrote:
Also I just saw your video, tek advises against running the 2400 series
outside the case because the dac will get hot quick. They say if you do to
have an equal amount of air blowing across it
Sent from Mail for Windows 10
From: Dewey Wyatt
Sent: Saturday, May 26, 2018 8:03 PM
To: [email protected]
Subject: Re: [TekScopes] New to me Tek 2465A DM - Not Getting Waves
Didn¡¯t on my 2430a, if that wont work then look at this one
and I still have others if
this one doesn¡¯t fill the bill. The others are fine in my 2430a, I tried a
bunch and finally setteled on these for the ease of using an external
battery. The 2430 wouldn¡¯t do anything with the memory dead. I do not know
how much was left in the old dallas chips but it wouldn¡¯t run setup. I did
cut thru the casing and solder wires to an external battery, read and wrote
to new chips and replaced them in zif sockets. When I started it up it was
as good as new, no errors and all functions worked. I checked it for
calibration and its spot on. You wont find cheaper dallas chips than these
in the link and mine were both 2015 date code. I have a bunch of chips that
I was trying to find a suitable replacement and I settled on the m48 chip
for the ease of getting a separate battery to power it. I really didn¡¯t
need to go as far as I did the 1230¡¯s would have been ok but you waste a
good memory chip for a dead battery. Also I have a brand new pair of these
same chip as ths soic but it is a dip style case with built in battery.
Sent from Mail for Windows 10
From: tmillermdems
Sent: Saturday, May 26, 2018 7:41 PM
To: [email protected]
Subject: Re: [TekScopes] New to me Tek 2465A DM - Not Getting Waves
That is a 3.3 volt chip. The 2465A is 5 volts. Is that going to cause a
problem?
----- Original Message -----
From: "Dewey Wyatt" <kn4wddewey@...>
To: <[email protected]>
Sent: Saturday, May 26, 2018 7:14 PM
Subject: Re: [TekScopes] New to me Tek 2465A DM - Not Getting Waves
10MH1F?qs=sGAEpiMZZMvaNBfR%2fsmQG7597m2%2f3hxZ8JIFuMiZC6I%3d
For some reason the link didn¡¯t go but here it is
Sent from Mail for Windows 10
From: Dewey Wyatt
Sent: Saturday, May 26, 2018 5:54 PM
To: [email protected]
Subject: Re: [TekScopes] New to me Tek 2465A DM - Not Getting Waves
This is the memory chip I used it has a snaphat battery and I have some
extra boards to adapt a soic chip to the dip socket. Use the zif sockets
they are worth the price. If you need the adapters I have 8 left I used
two
pair for the memory in mine I saved one extra pair and labeled them as an
incase they are powered by an 18650 3400mah battery that should outlast me.
Sent from Mail for Windows 10
From: Dewey Wyatt
Sent: Saturday, May 26, 2018 5:48 PM
To: [email protected]
Subject: Re: [TekScopes] New to me Tek 2465A DM - Not Getting Waves
Alan my 2430 suffered from the same test fail. As I understand if the
battery in the dallas chip has 1.5 volt left then it still retains the
calib
data,just not able to read or write to the memory the 1225 is nla but the
2430 is I did read mine and copy data but I had to perform surgery and add
a
3v battery by cutting a hole in the chip to expose the battery. Read this
article and should you want to part with one keep me in mind. This was the
article that gave me the courage to try and repair mine. I have a lot of
data and a lot of chips that replace the 12 series dallas chips one with
an
external replacable battery and also have a chip reader writer.
CALIBRATION___REPOWERING_THE_DS1225.pdf
the aurthor of this is still around and he has answered questions for me.
Sent from Mail for Windows 10
From: Alan Halls
Sent: Saturday, May 26, 2018 5:31 PM
To: [email protected]
Subject: [TekScopes] New to me Tek 2465A DM - Not Getting Waves
I just picked up 3 used Tektronix 2465A scopes for about $100 and am
working
on getting at least one working. They have been sitting for a while and 2
of
them power on with a message "Test 04 Fail 03", which I understand means
it
will need to be recalibrated due to the battery running out of power. I
tried bypassing the error and am able to get some flashing lights on
channel
1, as long as the time is decreased to it's lowest setting, as soon as I
try
getting it to trace the line over time I lose it. Here is a video which
includes all the buttons I have pushed :)
If anyone has dealt with this and knows what I should do next, I would
appreciate it.
---
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