HP 8340b User Manual

10.
Measure
and
record
the
voltages
at:
A31P1
pin13(M1)
pin
28
(M2)
pin14(M3)
pin
29 (M4)
pin15(M5)
Compare
the
recorded voltages
with the
voltage
levels
provided
in
Table B-1
(use
the
M
divide
number
shown
in
the
POWER
dBm
display to
determine
which
voltage
levels
to
use
in the
table).
If
the
voltages
are correct,
proceed
with
step 12.
If
any
of
the
voltages
are
incorrect,
proceed
with
step
11.
11.
Remove
the
A31
assembly and
repeat
step 10.
If
the
voltages
are
still
incorrect,
the failure
is
due to
a
shorted
or open
trace
on
the
A34
reference
loop
—
M/N
loop
Motherboard
or
an
A59
digital
interface
assembly
failure.
If
the
voltages for
the
M1
through
M5
inputs
are
now
correct,
replace
A31.
12.
Measure
and
record
the
voltages
at:
A31P1
pin
8(N1)
pin
23
(N2)
pin 10 (N3)
pin 25 (N4)
pin
9
(N5)
pin
24
(N6)
Compare
the
recorded
voltages
with
the
voltage levels
provided
in
Table
B-1
(use
the
N
divide
number
shown
in
the
POWER
dBm
display
to
determine
which
voltage
levels to
use
in
the
table).
If
the
voltages
are
correct,
proceed
with
step
14.
If
any
of the
voltages
are
incorrect,
proceed
with
step
13.
13.
Remove
the
A31
assembly
and
repeat
step
12.
If
the
voltages
are
still
incorrect,
the
failure
is
due to
a
shorted
or
open
trace
on
the
A34
reference
loop
—
M/N
loop
motherboard
or
an
A59
digital
interface
assembly
failure.
If
the
voltages for
the
M1
through
M5
inputs
are
now correct,
replace
A31.
B-24
M/N
Loop
Assembly-Level
Troubleshooting
HP 8340B/41B

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English