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Physio Control LIFEPAK 9 - Page 49

Physio Control LIFEPAK 9
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Raster
Generator
CRT
Bias
Generator
©
August
1993
Physio—Control
Description
1
The
Raster
Voltage
Generator
circuit
is
designed
around
transformer
T501
and
transistors
Q501
and
Q502.
The
oscillating
output
of
U201
drives
Q501,
providing
additional
current
for
Q502.
The
output
of
Q502
sets
the
voltage
for
the
primary
of
T301.
The
+15V
input
at
T501
pin
4
produces
+15V
(30V
total)
output
at
pin
5.
A
tap
at
T501
pin
6
supplies
+24V.
The
secondary
winding
on
Tl
adds
+14V
to
boost
the
+24V
to
+40V
output
at
T501
pin
8.
This
voltage
provides
a
ground
reference
for
biasing
G1, G2,
and
G4.
Vertical
deflection
for
the
raster
yoke
is
provided
by
the
Raster
Generator
circuit.
Because
of
high
current
and
voltage
requirements,
the
vertical
deflection
circuit
consists
of
discrete
components,
forming
a
resonant
Circuit.
The
Raster
Generator,
like
the
Raster
Voltage
Generator,
is
driven
from
the
Raster
Scan
Oscillator
circuit.
The
Raster
Generator
circuit
includes
transformer
T301,
which
is
shared
with
the
CRT
Bias
Generator
and
provides
the
drive
signal
for
the
88mH
yoke
coil.
This
creates
the
vertical
scan
drive
for
the
CRT.
The
Display
Gate
Array
on
the
Main
PCB
supplies
the
synchronizing
signal,
Raster,
which
is
passed
to
voltage
regulator
U201.
The
output
of
U201
pin
9
causes
Q204
to
conduct,
providing
additional
current
for
Q205.
The
output
of
Q205
controls
the
charge
and
discharge
of
C208
through
C212.
The
precise
values
of
these
capacitors
are
essential
for
maintaining
the
proper
resonance
while
charging
and
discharging.
Transformer
T301
provides
high
voltage
for
charging
the
capacitors.
The
CRT
Bias
Generator
supplies
half-wave
rectified
voltage
for
the
CRT
anode
and
grid
from
the
output
of
transformer
T301.
It
provides
up
to
-150V
for
bias
of
G1,
up
to
+700V
for
bias
of
G2
and
G4,
and
between
+8.5kV
and
+11.6kV
for
anode
bias.
Master
Brightness,
R302,
adjusts
the
brightness
which
largely
determines
the
general
background
brightness
of
the
CRT.
Focus,
R306,
adjusts
the
focus.
All
Rights
Reserved
1-35

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