Author Topic: 2465B/2467B NVRAM image, different cable, CAL proceedure  (Read 1503 times)

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Offline jonpaulTopic starter

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2465B/2467B NVRAM image, different cable, CAL proceedure
« on: December 12, 2018, 12:48:20 pm »
Hello all:

Have a nice 2467B and 2465B, both were great until the dreaded TEST 04 FAIL 10/11 etc

Finally got around to pulling A5 board, removing the Dallas NVRAM, placing low profine machined pin socket and copying the image.

Of course both had leaky SMD electrolytics, so some minor PCB rework, replaced a few SMD resistors, etc.

We now have suspicious image data, so probably failed NVRAM battery,  as the newly written  1225 NVRAMs give same symptom.


QUESTIONS:

1. Are images and data similar for 2465B and 2467B?

2. On 2465B A5 J4241 has a ribbon cable inserted, but NOT on 2467B.

Why the difference? The connector interferes with the NVRAM on the machined pin socket.

3. Does anybody in the EEV community have default images for the NVRAM?

4. With a very fully equipped lab, but no experience, is there a steep learning curve to do a full cal?

Heard its 4 hrs min and if any of the 200 steps gives out of limit, the entire CAL fails at the end to write.

Many thanks

Jon
Jean-Paul  the Internet Dinosaur
 

Offline MarkL

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Re: 2465B/2467B NVRAM image, different cable, CAL proceedure
« Reply #1 on: December 12, 2018, 10:43:39 pm »
1. Are images and data similar for 2465B and 2467B?
They have the same EPROMs, so they run the same firmware.

Quote
2. On 2465B A5 J4241 has a ribbon cable inserted, but NOT on 2467B.

Why the difference? The connector interferes with the NVRAM on the machined pin socket.
J4241 goes to the option board(s).  See interconnect diagram <13>.

So, your 2465B has (or had) options installed and the 2467B does not.

Quote
3. Does anybody in the EEV community have default images for the NVRAM?
There are some 2465B NVRAM images posted to TekScopes groups.io and here:

  https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/msg406372/#msg406372

And a 2467B NVRAM posted here:

  https://www.eevblog.com/forum/repair/tektronix-2467b-nvram-content-bin-file-inside/msg1187675/#msg1187675

Search...

Quote
4. With a very fully equipped lab, but no experience, is there a steep learning curve to do a full cal?

Heard its 4 hrs min and if any of the 200 steps gives out of limit, the entire CAL fails at the end to write.
There is not a steep learning curve, but you do have to follow the cal instructions to the letter.  Don't try to out-think them.

I haven't cal'd either one of these scopes, but maybe someone else can answer.  It would surprise me if you could lose everything.  At a minimum, according to the manual, you can do the sub-sections separately, e.g., CAL 01, 02, 03, etc.

There's a couple of people on TekScopes groups.io with extensive experience doing Tek calibrations if you want to ask over there for the details.

The TEST 04 FAIL errors are from corrupt calibration data in your NVRAM.  They will clear once you complete the calibration procedure.  You do not need to load your NVRAM with someone else's data.
 


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