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Hi Sigur?ur,

Option 9 includes option 6. IIRC you bring up the CTT menu with the A/B
TRIG/MENU button.

Yes, but according to the manual,should have a different designation, not "A/B TRIG" but "A/B MENU", also B TRIG options seems different.
It is almost impossible to tell if there is a different designation but the description say it should be different. Seems not.
Do you have a A/B TRIG MENU label near the button or simply A/B TRIG? Looking on the net never saw an image with A/B TRIG MENU label.


This is an image(awful) of the manual:


This is the closeup of that part of my front panel:


Anyway, I will try to activate the function to see if it works, simply pressing the A/B Trig won't work, probably I need something connected.

This is a purely analog scope, the only place the trace exists is on the
CRT.

I know, but having a HP-1500L ESA Spectrun analyzer that was able to send you the screen...I was hoping that. Not worth the hassle then, I agree.

--
Giuseppe Marullo
IW2JWW - JN45RQ

Hi again.

To finish off this thread.

For whatever reason, the 'spare' CRT damaged the video board, revealing that the CRT is dead and may well have been why the 2nd 492 had been stripped down so much.

In the end I didn't open up the YIG, as I was unable to locate any clear images so I focused on the LV rails (which is where I should have started in the first place). The +9v rail was reading +1.26v and the +9v rail 2A fuse was open.
One thing that had also changed following the failed CRT test was that the scale illumination no longer worked.
Swapping around the multi-pin illumination connector situated behind the CRT bezel resolved that problem, resolved the blown fuse and also resolved the lack of vertical deflection.

With the unit fixed and working again, I packed the SA away and have now passed it on.


The End.



James

Craig, no joy with the EXER 03 sequence, tried it a couple times. Same error - 04 Fail. I did notice when I clear by pressing A/B TRIG, I get 4 CRT lines and gibberish on the bottom of the screen.

pac1085, I may have to try another programmer. Do you see any need to buy $10+ worth of accessory boards and widgets?

Specific questions:

Are those resistances in the socket connections acceptable? In other words, should I reheat the the solder joints?

Thx, Ron

May not be related but I had a lot of trouble with the GQ-4x4 and my 2467B when replacing the Dallas chip. I went with the GQ since I watched a YouTube vid where someone used one successfully with a Tek scope. I wrote to GQ support and the suspected a defective programmer and wanted me to send it in. I returned it to Amazon, didn't want to waste weeks. I ended up buying an XGECU T48 and it worked fine.

Ron,
Try this exercise to see if this clears up your issue. Its a specific button push in the correct sequence.

CYCLE ERROR CLEAR (Exerciser 03). This routine
provides a way for the operator to clear the cycle-failure
data written to the RAM when a CYCLE mode failure
occurs. Interpretation of the cycle failure data is explained
in the "Display Format" description provided earlier in this
section. Until the data is cleared, each time the
instrument is powered up, the Diagnostic Monitor is
entered.
Clearing the RAM location (and the CYCLE ERROR
message) is done by scrolling to EXER 03 (CLEAR CYCLE
ERROR) and pressing the following switches in sequence:
TRIGGER COUPLING upper (starts exerciser),
TRIGGER SOURCE lower,
TRIGGER MODE lower, then
TRIGGER COUPLING lower (exits the exerciser).
When the CYCLE ERROR CLEAR routine is successfully
executed, the cycle failure data will disappear from
the display.

Hi,

The manual doesn't look like the "interim" one:



They've updated the pdf file I guess.
I also have the pdf from Artek, it looks identical.

Best regards,

I bought a no error codes on startup S/N B057443. Inspection of A5 showed no leaking of the SMD eCaps, but the Dallas DS1225Y was 1991 vintage by date code. I bought a new Dallas DS1225AB-200+ from Mouser. Desoldered the old SRAM with a Hakko 472D uneventfully, placed a TE Connectivity 1-2199299-2 28P DIP SKT 600 CL LADDER socket and soldered it in place without drama. Good looking solder joints. I was able to read the 1991 DS1225Y with the GQ-4x4 programmer and saved the data to a .bin file. I wrote and verified the .bin file to the 2023 “new” DS1225AB-200+ SRAM. Placed it carefully and correctly into the sock, and now have the 04 Fail error. Same thing with the old 1991 SRAM.

I read the old and new SRAM data sets after trying startup, both sets of data were significantly changed. Bad solder joints?

I ohm-checked the SRAM socket pins to the A5 board connections, listed below. The lowest resistance I found was a few .02Ω, most common was about .2Ω and the highest was .53Ω. Seems higher than I’d like in general. Normal?

Tek 2465B Late A5 U2460 Pin Connections

U2460
Pin Descriptor Component Pin
1 U2250 15
2 BA12 U2160 3
3 BA7 " 4
4 BA6 " 5
5 BA5 " 6
6 BA4 " 7
7 BA3 " 8
8 BA2 " 9
9 BA1 " 10
10 BA0 " 11
11 BD0 J4241 29
12 BD1 " 27
13 BD2 " 25
14 - " -
15 BD3 " 23
16 BD4 " 28
17 BD5 " 24
18 BD6 " 22
19 BD7 " 20
20 U2250 11
21 BA10 U2160 24
22 " 25
23 BA11 " 27
24 BA9 " 28
25 BA8 " 29
26 U2250 19
27 J512 23

I’m at a loss what to do going forward. Any help would be appreciated.

Thanks, Ron
AF5IV

It’s the effect of internal capacitance in the device and/or heating/cooling of the semiconductor junction.

Dave: I will make another round of them. April 5th is not far off but it's possible they could be ready for purchase then.

-Thomas

Thomas!

I will be visiting the museum on April 5th!!! Is there any chance you can save me one?!?!?

- Dave KQ4VBE

Thanks Alex,
1) could you please confirm that your 2465B has a low serial?
If so you should have performed the battery mod, else it should fail the battery voltage check, right?

I saw that the original creator of the read utility had a 2465B low serial, so hopefully the FRAM mod is doable also on that model.

2) Could you be so kind and send me *exact* Mouse BOM for it?

and prices had skyrocketed to something over $63 (!)

I saw the FRAM adapter and yes, probably ARIES got acquired by Cartier.

I could buy the GQ4X4 + eraser, I don't have much use of it but it is something I always wanted to buy, you never know. It seems pretty decent for the price, don't see many alternatives in that price range with the confirmed ability to deal with FRAMs.

Thanks a lot.

--
Giuseppe Marullo
IW2JWW - JN45RQ

Hi,
Can anyone explain why my Tektronix shows double curves in each step when I testing transistors?
thank you!
/g/TekScopes/album?id=301335

Perfect. I sent you my SN info directly, hope it helps.

I am very interested in the tube adaptor for my 575. I was not aware a tube tester was not needed. I do have a couple Sencore testers.

John

On Sun, Mar 16, 2025 at 08:39 AM, Giuseppe Marullo[iw2jww] wrote:

GQ PRG113 GQ4X4 + ADP054 + EPROM ERASER

2) would it be possible to use the FRAM+DIP adapter solution and get rid
of the battery altogether? It is not clear to me if this could be used
on the low serial scopes also. Same goes for the programmer mentioned
before.

I do have a 2465B with a FM16W08 FRAM and so far it has worked perfectly for several years. Plug-n-Play without any special mods or anything else but to mount the FRAM on an SOIC to DIP28 adapter, and copy the NVRAM data into it. I used the GQ4X4 programmer, that is compatible with both the FRAM and the original DS1225 NVRAM. I ordered the FRAM, NVRAM (150nS version), the low profile DIP28 socket and the Aries adapter all from Mouser back then. Last time I checked some months ago those Aries brand adapters (very good quality) where getting low in stock and prices had skyrocketed to something over $63 (!) for one piece, which is about triple what I paid back almost 3 years ago.

Hey there Hachiroku,

nice to meet you, welcome to the group :).

On Mon, Mar 17, 2025 at 9:46?AM chester.jamie.jammy via groups.io
<chester.jamie.jammy@...> wrote:

Hi, my name's Hachiroku.
1.36V and -1.25V Ref tested OK according to this post:
/g/TekScopes/message/13732

I guess one other thing to check is whether J504 is in the correct
position, it should be jumpered between pins 1-2. If it's jumpered between
pins 2-3, it's possible that the DACs reference is bad, which would be good
as that's a well known, repairable fault that can lead to the symptoms you
see.

Here are the voltage measurements (reference to ground) at the DAC pins.
DAC Pin 14=0.151V
DAC Pin 15 =0.147V
More voltages:
Voltage drop across R2013 (10K)= 8.82V
Voltage drop across R2016(10K)= 1.02V
Voltage drop across R2011 (4.75K)= 0.639V
Voltage drop across R2014 (221K)= 7.97V
Voltage drop across R2015 (82.5K)= 8.18V

These all look reasonable.

It's a shame that I've decided to give it up as l observed different
Serial Numbers on different parts of the scope.

I don't think parts or PCBs were serial matched on these scopes, nor
generally in Tek instruments.

l assumed parts may have been replaced/repaired before by someone else.

Seeing how the NVRAM was missing, you know that someone was in there before
you, and without knowing the story it's hard to say whether the scope might
have e.g. been a parts donor. Usually it's reasonable to assume there's
going to be a single fault to fix, but with an instrument that's been a
parts donor, that may not be the case.
That being said, this might be as simple as some other fault on the A5
board or e.g. U950.
There might be some easy diagnostic steps you could try to see if you can
narrow this down, like do the HORIZ/VERT POS controls work and so on.

Have a nice day Siggi and thanks for helping.

No worries. I find it highly rewarding to get these old beauties working,
and every instrument I've repaired has been a learning experience for me.
If ever you decide to circle back to this, you might enjoy reading this
document: .

Have a nice one,
Siggi

I need plastic cover box #342-0592-00 for Tektronix 2236 which is on the multmeter board. Does anybody have one to sell.

Ryan, I sent you an e-mail directly, check junk if you don't see it.
Someone in this group was kind enough to send me an unbuilt Dennis Tillman PCB. I bought the majority of the parts from digikey/mouser and started building it, and then ended up finding a 570 so never finished it. I can pass it on to someone else in the group now, but would like to recover the cost of the DigiKey order (I have to add it up but I think it was around $70)

There is a revised Service Manual that shows the trimmer on the HV Board. That manual is labeled "REV B May 1980" on the first page of the Table of Contents. So this was a Tektronix factory modification that probably allowed the HV Board to be tuned for different versions of the CRTs.

Hi, my name's Hachiroku.
1.36V and -1.25V Ref tested OK according to this post: /g/TekScopes/message/13732

Here are the voltage measurements (reference to ground) at the DAC pins.
DAC Pin 14=0.151V
DAC Pin 15 =0.147V
More voltages:
Voltage drop across R2013 (10K)= 8.82V
Voltage drop across R2016(10K)= 1.02V
Voltage drop across R2011 (4.75K)= 0.639V
Voltage drop across R2014 (221K)= 7.97V
Voltage drop across R2015 (82.5K)= 8.18V

It's a shame that I've decided to give it up as l observed different Serial Numbers on different parts of the scope. l assumed parts may have been replaced/repaired before by someone else.
Have a nice day Siggi and thanks for helping.