Hi,

just got my HP1980B scope (nice thing...).
Worked nicely (incl. readout) for like 1 minute, then there was a click
noise and the readout display is compressed horizontally to a very
narrow line.
Now the good thing: The processor and its periphery is fine, the scope
works just as it should and the menus also work, just i cant see much of
them.
Readout vertical deflection also is fine.
Normal horizontal deflection is fine (traces didplay nicely) so the
horizontal deflection hybrids (which are impossible to get without a
whole scope around them) probably are good.
Also, i didnt pay too much for it.

The bad things:
Readout horizontal deflection doesnt.
And if one scope really should have this working, its the 1980.Living
without this might work on a 7000series but not on that scope, esp since
navigating the menus without seeing them is bad.
Also, its HP, so most part numbers are HP numbers.
And, its a 1980B.Thats a surprisingly small case stuffed with 20kg of
electronics.Probably the analog scope with the most PCB area and largest
part count too.
Also i dont have a service manual (which would be darn incredibly useful
if i would know where the signal goes so i could look where it stops...)
and i could not locate any place that sells it (i have the
operating/programming manual).

Id have most of the equipment i would need for troubleshooting, that is
a tek TAS250 50Mhz analog scope, a slow storage scope, several meters
(including high-precision ones) and of course a soldering iron.
Just no service manual or schematics of the HP, which is bad.

Now does anyone have a idea what could be bad and what to do about?
Also, where to get a schematic/service manual?

---
Robert

Robert Obermayer wrote in
:

where to get a schematic/service manual?


HP 1980B Oscilloscope, Operating and Programming Manual: 204 pages. $13

http://www.fullnet.com/u/tomg/manuals.htm#2

Remember, Google is your friend.

Jim Land wrote:
HP 1980B Oscilloscope, Operating and Programming Manual: 204 pages. $13

http://www.fullnet.com/u/tomg/manuals.htm#2

Thats what i have in print.
Copntains zero schematics and repair info.
I would need the real service manual.