WTB: Gould DSO 400 Oscilloscope  - main Gate Array chip - CPU board - Full Unit - Page 1
Forum section: electronics / general

author: wootwoot
author_rank: Contributor
timestamp: May 14, 2023, 12:55:09 am
content: HiLooking to buy Gould DSO 400 digital oscilloscope parts. Specifically, I'm looking for the main gate array chip U24, a CPU board or full units that I can dismantle.Willing to accept damaged CPU boards.I am in Australia, but will consider postage for the board.I recently repaired the NiCd battery backup leakage that is common on these and upon soldering in a new battery a small solder bridge across two newly exposed traces destroyed a transistor and the alphanumeric video output on U24 'Gate Array' chip on the CPU board. Bridged traces were +15v and alphanumeric videoThanks! Wootwoot

author: Josec
author_rank: Contributor
timestamp: May 26, 2023, 03:35:29 am
content: I have a working oscilloscope, I have similar problem but is fixed. I am in Sydney.Jose

author: wootwoot
author_rank: Contributor
timestamp: May 26, 2023, 03:41:13 am
content: Thats great!I actually really like this scope. Would you be willing to sell yours?Wootwoot

author: Josec
author_rank: Contributor
timestamp: May 26, 2023, 04:39:09 am
content: Yes, I like to sell it, please pm to arrange.CheersJose

author: MK14
author_rank: Super Contributor
timestamp: May 31, 2023, 01:19:22 pm
content: https://www.eevblog.com/forum/buysellwanted/be-wary-of-scammers-protect-yourself/

author: Josec
author_rank: Contributor
timestamp: June 01, 2023, 01:48:25 am
content: Hi Wootwoot:I send the oscilloscope last Tuesday, is waiting for you in the post office to pick up since yesterday,, please let me know.if arrived OK.Cheers

author: PlainName
author_rank: Super Contributor
timestamp: June 01, 2023, 09:32:37 am
content: Quote from: Josec on June 01, 2023, 01:48:25 amLast Tuesday was 23rd, yet you didn't offer it for sale until the 26th.

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 01, 2023, 09:36:09 am
content: Where I live last Tuesday was the 30th

author: PlainName
author_rank: Super Contributor
timestamp: June 01, 2023, 09:44:21 am
content: Around here we'd call that this Tuesday. Good spot, though

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 01, 2023, 09:51:36 am
content: Quote from: PlainName on June 01, 2023, 09:44:21 amInteresting, never heard of that before!(but let's not hijack this thread)

author: wootwoot
author_rank: Contributor
timestamp: June 11, 2023, 03:34:52 am
content: Can vouch for Jose. The posties broke the scope, but what I really needed was the CPU board to get my existing one up so it all worked out.You could tell they threw the package on the floor. The CRT became dislodged and the neck cracked. Upon power up all it did was arc internally.Post office hrs being 9-5 meant I needed to wait to Friday to get it.But, during the week I tidied the CPU board, swapped in the later versions of the ROMs, replaced the mains capacitors that exploded and poured stink everywhere (which obviously happened to you previously Jose) and its up and running. And I have a full chassis of spares.The Rigol in the picture is one I was borrowing from a friend. But I think with the option of an old analogue scope, I actually prefer using this!Also have the serial working so can make basic captures with it.

author: Josec
author_rank: Contributor
timestamp: June 11, 2023, 08:38:50 am
content: I like to cry thinking I took care of that instrument for more than 25years, and was destroyed for complete lack of care.I pay extra for insurance, still having the receipt, I will claim at the post office.Keep you inform.CheersJose

author: wootwoot
author_rank: Contributor
timestamp: June 11, 2023, 09:58:49 am
content: I know. I was so disappointed when it showed up like that. I guess I have to say, Gould could have done more than just to glue the CRT in with silicone... But, it must have been dropped reasonably hard to dislodge it like that.Very glad I still had my chassis because now the heart of your unit, or probably more accurately its brain, lives on. Complete with your circuit repairs! I intend to make good use of it for years going forward.It's pretty cool to have the cover and the low voltage supply cable now. And the printed manuals!

author: super7800
author_rank: Regular Contributor
timestamp: June 11, 2023, 03:01:45 pm
content: I sell alot on ebay, and even do foreign shipping of very fragile items. In 10 years I've only lost two items due to damage (one was literally dropped in the water going to hawaii). As a suggestion for future packages, buy a sheet of 4'x8'x1" hard pink Styrofoam insulation and lots if tape, and layer it 2 to 3 layers thick on all sides, then cover in cardboard and some tape. I've had 100% success with this method.