Tektronix 2430A - Page 1
Forum section: electronics / repair

author: m3vuv
author_rank: Super Contributor
timestamp: December 23, 2021, 04:07:47 pm
content: can anyone tell me what nvram ic /battery backup is used in these scopes? tia.

author: m3vuv
author_rank: Super Contributor
timestamp: December 23, 2021, 11:06:59 pm
content: is this simple question to hard for folks to answer?,im lost for words!!!!

author: wn1fju
author_rank: Frequent Contributor
timestamp: December 23, 2021, 11:14:26 pm
content: https://w140.com/tekwiki/wiki/has the service manual. That's a good site for all Tektronix info.But to answer your question, I downloaded the 2430A manual and found the battery listed in the manual as"3.6-volt, 1.6-Amp Hour, Lithium Thionyl Chloride; ManufacturerEAGLE PICHER, Type L TC16P/P, TEK Part Number 146-0062-00"The schematic seems to indicate it backs up U664 on the processor board which is a 32768 x 8 SRAM.

author: David Hess
author_rank: Super Contributor
timestamp: December 24, 2021, 05:02:26 am
content: Late models use two of Dallas DS1230AB-120.

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: December 25, 2021, 01:51:01 pm
content: To add to davids response: and deleted the battery.Jeff

author: David Hess
author_rank: Super Contributor
timestamp: December 25, 2021, 06:54:10 pm
content: The late models use the same printed circuit board, but the battery and backup circuitry are removed, and the Dallas nvSRAMs replaced the original static RAMs. The low battery detection circuit was replaced with a fixed divider so they did not even have to change the firmware.In theory a late model can be rebuilt to the early configuration with SRAMs and a battery, which is what I considered doing to my 2440 if I was unable to find replacements for the nvSRAMs.

author: m3vuv
author_rank: Super Contributor
timestamp: December 27, 2021, 04:47:16 am
content: any more info on this,im still waiting for the scope to be delivered,only payed £70 for it so not a big deal if i cant fix it,it has a blured out of focus crt as well,ive ordered replacements for R248 and R247 in the focus circuit,will have to wait until the scope gets delivered first so maybe i am jumping the gun,this is what i won.https://www.ebay.co.uk/itm/294643654575

author: wn1fju
author_rank: Frequent Contributor
timestamp: December 27, 2021, 01:18:32 pm
content: If I initiated a post soliciting answers, and then complained a mere 7 hours later that nobody had yet responded, and then three different people provided answers, I would at least acknowledge their efforts and say thank you. A "TIA" in your original post just doesn't cut it. But hey, maybe that's just me.

author: m3vuv
author_rank: Super Contributor
timestamp: December 27, 2021, 09:09:27 pm
content: dont have this scope yet as royal mail deliverys are shut untill the 29th,as regards the blured crt display i have ordered new resistors for R248+R247 in the hv focus chain,just out of interest ive a good crt from a tek 2215,would that fit in the 2430a?,just in case the crt is dead,tia.

author: bdunham7
author_rank: Super Contributor
timestamp: December 27, 2021, 09:34:49 pm
content: Quote from: m3vuv on December 27, 2021, 09:09:27 pmNo, the 2400 CRTs are different. I think you can swap in a 2445/2465 CRT with some extra work if you need to. I wouldn't start worrying about all that until you have it in your paws.