ASSEMBLY ISOLATION
To
help verify that
a
problem
is
on
the
A59 assembly, remove the assembly and observe the
instru¬
ment. With the
ASS
assembly removed,
you should see
the
following:
1.
Following power on or instrument preset, both instrument check LEDs should go
off.
2.
All
16 self test LEDs on the
A60 processor assembly
should go off.
3.
Turn the
line
switch to standby, and then on.
The instrument
should
preset rather than restoring
the
prior state.
4.
Verify that the:
OVEN annunciator
is
on
EXT REF
is
annunciator
is off
UNLOCKED annunciator
is
off
SRQ
annunciator
is
off
REMOTE
annunciator
is
off
F-12
A59 Digital
Interface Assembly-Level Troubleshooting
HP 8340B/41B