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Hello everyone, I would like to tell you about the error.

The oscilloscope can be switched on, the fan is running and the Key lighting stays on permanently. On the A11 DRAM Processor/Display Board number 8 lights up on the segment display.

The device had a problem with all SMD capacitors. Then I replaced all the capacitors and cleaned all Circuit boards.

Unfortunately, this action did not fix the error.

I then started troubleshooting using the service instructions.

Here are the links to it:

Volume 1:


Volume 2:


I carried out the diagnosis on Volume 1, page 187. The fan is running and after 30 seconds the key lights doesnt turn off. Thereupon According to the instructions, I troubleshooted the processor/front panel procedure (Volume 1 page 195).

I checked all the required voltages on connector J2. all OK. The clock signal (3.125Mhz) is also present.

According to the instructions, the communication link between the A11 Display/processor board and the A12 front module is faulty. The A12 Front module is most likely defective and should be replaced.

There are a lot of troubleshooting instructions described in volume 2 but I think Unfortunately not one applies to me. I think there are missing a few pages.

I have measured the processor on the A12 board (Volume 2 page 218). Unfortunately the 3rd page is missing there.

I noticed that there was no 2Khz signal on pin 2 of the processor (U1). This means there is no 1Khz square wave signal to set probe. The operating voltages are OK.
The clock signal from the A11 board is also present.

Does anyone have an idea what this could be? Does anyone know how I should proceed?

I wish everyone a merry Christmas!

Greetings from Germany
Paul

From memory, an '8.' on the 7-segment display often indicates the scope can't read the contents of NVRAM.


Jared

Thanks for the reply. Today I unsoldered about 20 chips that were near the capacitors to see if there were any interruptions in the conductor tracks. I didn't find any interruption.

How do you think I could continue?

Today I took a look at the DALLAS DS1245Y-120 NVRAM. As far as I can tell, the battery is empty and all data is gone. :( I tried reading it out with Xgpro. Only AA AA AA are displayed throughout.

Does anyone have an idea where I can get the data for the NVRAM?

Hey Paul,

From what I understand, there's no critical data in the NVRAM on the
TDS5/6/700s. It's just settings and e.g. the results of SPC. If you had
options installed, then they can be reinstalled through GPIB.

Siggi

On Sat, Feb 1, 2025 at 9:22?AM Paul via groups.io <barpa97=
[email protected]> wrote:

Today I took a look at the DALLAS DS1245Y-120 NVRAM. As far as I can tell,
the battery is empty and all data is gone. :( I tried reading it out with
Xgpro. Only AA AA AA are displayed throughout.

Does anyone have an idea where I can get the data for the NVRAM?

Okay, that calms me down. But there has to be something on it. Maybe someone made a copy of their NVRAM from a TDS 520. I think that's why it doesn't boot.

Unfortunately I can't do anything with GBIP because it won't boot.