Welch Allyn Grason-Stadler GSI 17 Series - The Front Panel Controls and Indicators; Section 2 - Functional Description

SECTION 2
-.
Functional Description
This section of
the Service Manual is
used to
describe
the
Connectors,
Controls,
and Indicators of the GSI 17.
Refer to
Figure
2-l for the layout and positioning of
all
Connectors,
Controls,and Indicators.
2.1 THE FRONT PANEL CONTROLS AND INDICATORS (FIGURE 2-1)
F1 -
Power switch and indicators for ON (1) and OFF (0).
F2 - Range extension pushbutton allows
operator to
increase
the
stimulus intensity 10 dB
above
the
standard
maximum
HL at
any
frequency -
its
operation is indicated by the "+" being lit on
the
LCD.
F3 -
HL control for setting stimulus
intensity
level.
Level indicated on LCD.
F4
- Present Bar for stimulus presentation.
F5 -
Loudspeaker
in operation as such.
Actual
presentation indicated by illuminated LED.
F6 - Subject response
indicator LED shows the operator
that the test subject has pressed the handswitch
button.
F7 - Frequency
control for setting stimulus
frequency.
Frequency indicated in window adjacent to control.
F8 - Routing
switch for routing the stimulus signal to
the
left or
right
earphone.
Left or
indicated by illustration of subject.
right
F9 - Tone
type
switch for setting
the
stimulus
tone
type.
FM
= warble tone
= steady tone
---
= pulsed tone
F10 -
Low battery indicator to alert the
operator
when
the
batteries
have a
limited
time
available
operating
(recharge or
replace
batteries
soon,
depending
on whether NiCad or
alkaline
batteries
are used).
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