Products > Test Equipment

I noticed nvram replacements for the TDS784D on ebay

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cuebus:
I started a new thread for this:
https://www.eevblog.com/forum/repair/dallas-ds1486-and-ds1250-replacement-designs/

All gerbers and BOM can be found there  :-+

CaptDon:
I bought the full set for a TDS644B and a single part for the TDS644A.
Both of my scopes are now 100% like factory new!! I downloaded and
sent him my files which he pre-loaded for me so it was plug and play!!
I would only say he should have used coin cell holders instead of the
solder-in style batteries. I am super pleased that both scopes are working
and will be for many years to come. The seller also responds quickly to
emails even prior to buying the product!!

james_s:

--- Quote from: CaptDon on September 22, 2020, 02:51:52 pm ---I bought the full set for a TDS644B and a single part for the TDS644A.
Both of my scopes are now 100% like factory new!! I downloaded and
sent him my files which he pre-loaded for me so it was plug and play!!
I would only say he should have used coin cell holders instead of the
solder-in style batteries. I am super pleased that both scopes are working
and will be for many years to come. The seller also responds quickly to
emails even prior to buying the product!!

--- End quote ---

If you have the video trigger board installed then coin cell holders would make the chips too tall. Even without them it was a tight fit in mine using low profile IC sockets. If I'd had even lower profile pins to put on the modules that would provide a bit more clearance though.

Tantratron:

--- Quote from: james_s on September 22, 2020, 09:36:45 pm ---If you have the video trigger board installed then coin cell holders would make the chips too tall. Even without them it was a tight fit in mine using low profile IC sockets. If I'd had even lower profile pins to put on the modules that would provide a bit more clearance though.

--- End quote ---
Not sure if this is a safe test to do but was wondering two questions.

Say you remove both NVRAMs from their socket then restart the TDS oscilloscope, will this brick for ever the TDS ?

Later if you re-plug in the sockets each NVRAM, does the TDS will work again ?

Additionally, what are the symptoms of an actual DS1486 and DS1650 going progressively with low voltage potted battery ?

james_s:
My recollection is that one of the two is necessary for the scope to boot, the other can be removed and it will still boot up. In both cases if you replace the missing part normal operation will be restored.

Symptoms I've seen when similar Dallas parts get low batteries are the RTC stops advancing while the power is off and in the ones that are just NVRAM they will start randomly getting corrupted. I was surprised when I cut into a DS1742W that was getting flaky and found the battery was only at 0.8V, it would still hold the memory, it just wasn't advancing the clock when the scope was shut off.

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