Products > Test Equipment
HP 53310A Modulation Domain Analyzer -frequency microscope-
<< < (5/8) > >>
Tomorokoshi:

--- Quote from: kj7e on April 14, 2019, 01:28:05 pm ---Just for future reference, found a bunch of HP Application Notes for the 53310A;

...

Disappointingly, I was not able to find any HP Journal articles.

--- End quote ---

There is this one mention in Bench Briefs:
http://hparchive.com/Bench_Briefs/HP-Bench-Briefs-1994-04-06.pdf
TAMHAN:
Hello Folks,
sorry to chime in here again - but my HP 53310A just went tits up. I started it, the screen was full of vertical lines (looked like a video card sync fail to me). Powered it off, on again and nothing to be seen on the screen.

I already opened the unit and the CRT filament is hot. However, I see all (!!!) of the red LEDs on the A13 CPU card (the one below the Boeschert cartridge) being lit. Could anyone of you take a look whether they are lit or dark on a working 53310A - I do have the CLIP from Artek,  but it is suprisingly silent on this matter.

Tam
TAMHAN:
Hello Folks,
and the saga is getting weirder.

Called my wife, we started to go through the service manual tour a tour. Removed the cable interconnecting the display and the CPU board, and reinstalled it. Powered the unit on and off a few times, got nothing and all the LEDs on the CPU board stayed lit (!!!).

After that, we let it sit powered off for some time and powered it up again. He started with a message stating that he found an invalid instruction which can be cleared by power cycling with a pressed front panel button (any). Did that, got it working but requiring a self cal to pass all (!!!) self tests.

By the way, the LEDs go off as parts of the test pass, and when running, you get a KIT-like light effect.

Tam

TurboTom:
@Tam -

my suggestion would be to have a good look at the supply rails, especially the 5V. The CPU board contians a reset chip (U14, DS1232S) that is configured for a tolerance range of 5%. If the 5V rail stays or repeatedly drops below about 4.7V, it will keep the CPU in reset. As you probably know, the Boeschert supplies are notorious for leaking electrolytics and this may well manifest in drooping voltage levels.
Cheers,
Thomas
TAMHAN:
Hello,
thanks for talking back!

I forgot to add: the Boeschert cartridge was totally recapped one year ago or so. So that most probably could not have been the source of the problem.

As of this writing, however, the machine still works...

Tam
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod