HP 8340b - Shift Manual; Shift Free Run; Shift Ext

SHIFT
MANUAL
(HP-IB:
SHS3)
If,
during
normal
operation,
the
amber
FAULT
annunciator
appears
in
the ENTRY
DISPLAY:
1.
Press
[SHIFT] [MANUAL]
to
initiate
the
FAULT
diagnostic
routine
FAULT CAL KICK ADC PEAK
TRK
appears
in
the
ENTRY
DISPLAY.
A
flashing
cursor
indicates
the
faulty
instrument
area:
CAL
calibration
constants
KICK
kick
sweep
end points
ADC
analog-to-digital
converter
PEAK
power
peaking
TRK
tracking
Refer
to
Figure
A-4.
SHIFT
FREE
RUN
(HP-IB:
SHT1)
1.
To activate
the
display
self
test
diagnostic
function,
press:
[SHIFT]
[FREE RUN]
This
causes
every
segment
of
every
LED
in
the
displays to
light,
followed
by
a
marching pattern
of
every
character
in
the
display.
SHIFT EXT
(HP-IB:
SHT3)
If
the
red
UNLK
annunciator
appears
in
the
ENTRY DISPLAY:
1.
Press
[SHIFT] [EXT]
to
activate
the
oscillator diagnostic
function.
OSC:
REF
M/N
HET YO
N2
N1
appears
in
the
ENTRY
DISPLAY.
The
flashing
cursor
indicates which
oscillator
circuit
is
causing
the
unlocked
condition.
HP
8340B/41B
Assembly-Level
Service
Front
Panel
Diagnostics
A-27