There was something I'm supposed to be doing since yesterday, daunting enough to justify serious procrastination. So instead I started fixing a Tek rackmount R7633 scope I've had shelved since 2004, when it arrived from the USA badly damaged due to ridiculously inadequate packing. Pretty annoying; it was working and in great condition when the guy put it loosely in a thin cardboard box, sprinkled in a few styro peanuts, and consigned it to the courier monkeys.
Today I stripped it down to the bare frame, and most of the mangled metalwork is now fixed. Couple of little bits still to do, that need TIG welding and machining. I'll keep this thread updated with progress, but started it just for this:
A very unusual thing turned up when disassembling this scope. A PCB with lots of surface mount parts. In a Tek 7000 series scope. It's not some latter hack either, it's an original Tek module.
Tek Wiki
http://w140.com/tekwiki/wiki/7633 says:
After the 7633 and 7934 were discontinued in 1990, the 7623B (which added the reduced-scan mode to the 7623 and therefore had essentially the same specs and features as the 7633) was the last analog storage scope model in the 7000 series, available until the entire 7000 family was discontinued in 1992.
The SMD board is the display readout card, PN 389-0559-01, marked (c)1989. It has an Intel 80C31 CPU and a 27C256-20 EPROM. Some IC date codes 8914 & 8916.
My paper 7633/R7633 manual includes the first Readout board, plus a latter one: SN B240054-up. But not this one.
The manual is "Revised FEB 1989". Apparently just too soon to include the _third_ type of display readout system in my R7633. Which was discontinued the next year.
So my broken old R7633, sitting on a shelf for over a decade, is quite a rare beast. Hope I can get it working.
Finding a manual with this readout board will probably be difficult. The PDF manuals I find online are all the same early version:
http://w140.com/tektronix_7633_r7633.pdf 120.6MB
This is an early version. It only has the early Readout board, that is "SN B240053-below" in my manual.
Schematics have blue detailing. This is the original fairly hires scan.
http://exodus.poly.edu/~kurt/manuals/manuals/Tektronix/TEK%207633%20%20Service.pdf 41.7MB
The exact same scan as the w140 one above, except more compression.
http://bama.edebris.com/download/tek/7633/tek-7633.pdf 41.7MB
Same file as exodus.
Does anyone have a late 1989 or 1990 manual for the 7633/R7633 ? My Tek 7633 scope is SN: H705286, made in Holland.
Edit to add: Also I attached the EPROM image. U2105.bin (in a ZIP)
Checksum reads as 88D1, which is what the label says.
Oh, and anther mystery. See pic 20160413_3338.jpg. Someone engraved "SN: 00001" in the metalwork, inside one of the slots. Why? Could it have been the first one with the new new readout board? But you'd think if Tek did that, they'd have done a neater job?