On Fri, Feb 21, 2025 at 6:10?AM James55 via groups.io <james_55=
[email protected]> wrote:
It briefly flashes some LED's before going to sleep. No beam finder, no
scale illumination etc.
If the scope is dropping into the diagnostic monitor due to a power on self
test (POST) failure, the 2465A should leave a front panel LED lit. The LEDs
flashing on the front panel (FP) are indicating POST progress, so you can
tell what's happening and where it's getting stuck. There is a table
somewhere in section 6 of the service manual that correlates FP LEDs to
tests *one I always fail to find when I look for it).
If the scope is failing a POST, then you should be able to drop out of the
diagnostic monitor by pressing the A/B TRIG button, at which point you
should be able to mess with the CH1/2 V/DIV controls, hear relays clicking
and such.
If you report which test is failing (I'm going to bet on the 05 tests), we
can probably point you in a profitable direction.
The scope can also fail earlier tests, the "Kernel tests" (IIRC), which
would also leave breadcrumbs on the FP LEDs, but those indicate more
serious A5 failures.
My 2467 suffered a problem on the A5 board that collapsed the -1.25 and
1.36 reference voltages, which led to no trace, no on-screen-display (OSD)
and 05 POST failure. If you have another A5 board to drop in, my bet is
that'd resurrect traces and OSD.
Good luck,
Siggi
