Display Diagnostic Tes Tt - Welch Allyn Grason-Stadler GSI 17 Series Service Manual

4.9.3 DISPLAY DIAGNOSTIC TES TT

TEST DESCRIPTION
test provides a means of visually testing the operation of
This
all LCD segments and LEDS.
will be displayed on the HL display for
"D2 "
segments and LEDs will then be blanked for 2 seconds, after which
segments and LEDs will be turned on for 2 seconds to
all
inspection for
segments/LEDs will then be turned on individually for 1 second in
left to right, top to bottom sequence to allow for
a
shorts between segments.
of
any
sequenced through all segments/LEDs will be turned back on
been
to indicate the completion of the test.
During this test the low battery voltage monitoring will not be
performed since the display is not available to indicate a
battery condition.
TEST INITIALIZATION
When switched into the display diagnostic test,
will be initialized as follows:
Tone Type = Current selection
Frequency = Current selection
Stimulus M
Channel = OFF
Attenuator position = 255
+10 dB Pad = Out
Transducer Routing = None
HL Display = Displays "D2" for 2 seconds and then the
display test starts
Response LED = OFF
Stimulus On LED = OFF
Low Battery Segment = Current state
DESCRIPTION OF CONTROLS
All controls
this diagnostic test.
ignored.
DESCRIPTION OF DISPLAYS
All LCD segments and LEDs are tested during this diagnostic test.
no parameter or status information displayed on
There are
displays.
When the test is selected, the
any displays which
= Current position
UX
except the Cal/Normal switch are
Operations of all other controls will be
(D2)
2 seconds.
do not
After all segments/LEDs
code
All
allow
turn on. All
inspection
have
low
the instrument
during
inactive
the