I checked further and I have noticed missing chips on the board. Are these
optional?

U400 155-0236-XX CH SWITCH
U600 155-0237-XX VERT OUT
U950 155-0242-XX Z AXIS

These look like PLCC sockets.



"Someone" wrote in message
news:_5vGe.21334$Eo.19333@fed1read04...
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