HP 8340B Manual page 251

AGO
Processor
Assembly-Level Troubleshooting
TYPES
OF TROUBLESHOOTING
There are several types
of troubleshooting for the A60 processor assembly:
•
Input Signal Verification. This
test checks several processor assembly
input signals and should
be performed
prior
to doing any in-depth troubleshooting.
•
Self Test. Self test
runs
when you turn the instrument on or when
you
press
[INSTR PRESET].
Two front panel
LEDs (INSTR CHECK I
and
INSTR CHECK
II) provide
a
visual indication of the self
check results.
•
SHIFT M4. When
you
initiate this diagnostic, you can check the
operation
of specific circuitry on
the A60 processor assembly.
INPUT SIGNAL VERIFICATION
When to Use Input Signal Verification
Use input signal verification prior to in-depth troubleshooting of the A60 assembly.
Verification
con¬
sists
of measuring all
input signals to
the A60 assembly,
in
addition to
a
few key signals that are
required to run self
test.
Equipment Required
A
DVM and/or
an oscilloscope.
Procedure
NOTE: The A60 processor
is
a
static sensitive
assembly. Work only
at an anti-static work station.
1.
Turn
line
power
off.
Place the
A60 processor assembly
on an extender.
2.
Turn line
power
on.
3.
Using
A60TP7
or
A60TP17 as ground, verify the
voltages
in Table F-2.
HP 8340B/41B
A60
Processor Assembly-Level Troubleshooting F-13