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Valleylab Force FX-C - Display Board; RF Indicator Lamps; REM Indicators; LED and Seven-Segment Display Drivers

Valleylab Force FX-C
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Display
Board
Force
FXTM-C
Service
Manual
Display
Board
Refer
to
Section
9
for
Components
and
the
Schematics
Supplement
for
Board
Drawings
and
Schematics.
The
Display
board
is
located
in
the
front
panel
assembly.
It
contains
RF
indicator
lamps,
seven-segment
LED
power
setting
displays,
REM
alarm
LEOs,
and
a
CEM
indicator
LED.
The
display
board
s\vitch
circuitry
includes
the
LED
and
lamp
driver
circuitry,
power
selection
switches,
mode
selection
switches,
the
REM svvitch
circuit
and
the
CEM
switch
circuit.
RF
Indicator
Lamps
The
RF
indicator
lamps
illuminate
during
RF
activation
to
visually
indicate
the
presence
of
RF
power.
Each
of
the
three
indicator
bars
(Bipolar,
Cut,
and
Coag)
on
the
front
panel
is
illuminated
by
four
incandescent
bulbs
(LPl-LP12).
•
LPI-LP4
illuminate
the
blue
Bipolar bnr,
indicating
bipolar
activation.
• LPS-LP8
illuminate
the
yellow
Cut
bar,
indicating
cut
activation.
• LP9-LP12
illuminate
the
blue
Coag
bar,
indicating
coag
activation.
The
RF
indicator
lamps
are
controlled
by
the
BIP _LMP, CVT_LMP,
and
COAG._LMP
signals.
These
originate
from
port
A
of
the
main
microcontroller
programmable
peripheral
(U3)
on
the
Control
board.
Buffers
in
VI
turn
the
RF
indicator
lamps
on
and
off. Resistors
RI-R12
set
the
nmount
of
current
flowing
through
the
lamps
when
they
are
turned
on.
The
value
of
these
resistors
varies
for
each
indicator
bar,
depending
on
the
color
of
the
bar,
to
make
the
different colors
of
the
bars
illuminate
with
equal
intensities.
REM
Indicators
The
REM
indicator
consists
of
two
bicolor
LED
arrays
incorporating
one
red
and
four
green
LEDs
per
array.
The
LEOs
are
controlled
by
the
REl'vCRED
and
RE!vCGREEN
signals
originating
from
port
A
of
the
main
microcontroller
programmable
peripheral
(U3)
on
the
Control
board.
The
signals
are
buffered
on
the
Display
board
by
driver
U1.
Both
the
red
and
green
LEOs
are
current
limited
by
100
ohm
resistors
(Rl3,
R14, R15,
and
R16).
LED
and
Seven-Segment
Display
Drivers
This
circuit
contains
three
display
drivers
for
the
LEOs
and
th.e
sevt'n-
segment
displays.
The
LEOs
indicate
modes
of
operation,
and
the
REM
condition.
The
seven-segment
displays
indicate
bipolar,
cut,
and
mag
power
settings.
4-13

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