Hi,

I got a used Tektronix 2465 oscilloscope with some problems and I was hoping
if anyone has suggestions in how to fix it. I would rather fix it rather
than sell it for parts.

It powers up fine but the display is very dim, and it becomes dimmer as the
time passes. I have to turn the lights off to see it. Adjusting the
intensity has no effect, it doesn't become brighter or dimmer, however,
pressing the beam finder brightens the display a bit. Readout intensity has
no effect, but I see 2 bright spots in the beam, I assume they are readouts.
Their intensity is fixed regardless of any adjustment.

The scope also has no vertical movement. I could see the trace as a
horizontal line in the center, and it responds to the horizontal position
knob, as a normal scope would, but it doesn't go up and down when I adjust
the vertical position. I already read in the newsgroup archives about the
problems with the horizontal output IC, U800, but this scope seems to have a
working one. It's part number TEK 155-0241-02.

Finally, I have only the operations manual, but not the service manual. Does
anybody have the service manual in PDF format? My email can handle up to
6.67 MB attachments. You can email it to n18 AT cox.net

I already have the 2465B service manual, but it's not the same. Downloaded
from here(See Tek):

http://bama.edebris.com/manuals/

Thank you