kENDALL SCD 5325 Service manual
December
1991
Operating
and
Service
Manual
SCD™
Compression
System
Controller
Model
5325
Serial
Number
KENDALL
HEALTHCARE
PRODUCTS
COMPANY
15
Hampshire
Street
Mansfield,
MA
02048
General
Operating
Instructions
Pre-Operation
Check
Operation
Fault
Conditions
Watchdog
Circuit
Contraindications
Cautions
Service
and
Maintenance
Warranty
and
Factory
Service
Filter
Maintenance
Ventilation
Fuses
Electrical
Safety
Cleaning
Electronics
Description
Pneumatics
Description
Port
Identity
Start-up
Routine
Calibration/Test
Methods
Calibration
Procedure
Valve
Function
Test
Diassembly/Reassembly
Instruction
Card
Replacement
Case
Removal
Circuit
Board
Removal
Circuit
Board
Installation
Compressor
Solenoid
Valves
Case
Reassembly
Drawings
&
Specifications
Page
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13
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14
15
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16
17
Appendix
General
Operating
Instructions
The
SCD
Compression
System
is
designed
to
apply
thigh-length
sequential
gradient
compres-
sion
to
the
lower
limbs
to
prevent
deep
vein
thrombosis
in
patients
at
risk.
Pre-Operation
Check
Before
using
the
SCD
System
on
the
patient,
verify
that:
e
The
Tubing
is
properly
connected
to
the
Controller
and
the
Sleeves.
Both
Sleeves
must
be
connected.
If
the
System
can
only
be
used
on
one
leg,
(e.g.,
amputee),
connect
the
second
Sleeve
but
leave
it
packaged
in
its
plastic
bag.
There
are
no
kinks
or
sharp
bends
in
the
Tubing.
The
back
and
bottom
of
the
Controller
are
unobstructed
for
free
air
flow.
The
Controller
power
cord
is
plugged
into
a
grounded
AC
receptacle
of
the
correct
voltage.
No
flammable
anesthetic
gases
are
present.
Operation
Turn
the
power
switch
on.
The
Controller
performs
a
self-diagnosis
and
lamp
check
upon
start-
up.
The
LED
segments
light,
starting
at
the
top
of
the
display
panel.
They
light
in
sequence
to
the
bottom.
At
the
end
of
this
test
(approximately
2
seconds),
there
is
a 2
to
6
second
pause
in
which
the
flow
control
valve
is
set
within
the
required
range.
The
Controller
then
begins
normal
operation
with
ankle
inflation.
NOTE:
The
Controller
“wakes
up”
with
the
Sleeve
Cooling
off
and
the
Audible
Alarm
on.
To
change
either,
press
the
appropriate
membrane
switch
while
the
machine
is
operating.
An
adjacent
LED
will
indicates
when
the
option
is
on.
In
the
case
of
a
SYSTEM
HIGH
[SH]
or
DIAGNOSTIC
[D(n)]
fault
condition,
the
alarm
will
sound
immediately
if
the
Audible
Alarm
is
enabled
or
it
will
sound
after
a
one
minute
delay
if
the
Audible
Alarm
is
disabled.
The
FAULT
LED
will
light,
the
appropriate
fault
code
will
be
displayed
and
the
Controller
will
shut
down
immediately
in
either
case.
Cycle
Monitor
The
SCD
5325
Controller
has
a
Cycle
Monitor
which
continuously
displays
the
status
of
the
Controller's
compression
sequence. The
Monitor
consists
of
four
back
lit
panels
which,
when
lighted,
read:
ANKLE,
CALF,
THIGH
and
VENT.
These
represent
the
four
major
divisions
of
one
complete
cycle.
During
operation,
the
ANKLE,
CALF,
THIGH
and
VENT
lights
will
light,
one
at
a
time,
to
indicate
each
of
the
major
cycle
divisions
in
turn.
Also
featured
is
a
ten-segment
bar
graph.
Each
of
the
ten
segments
of
the
bar
graph
represents
ten
percent
of
a
major
cycle
division
and
will
light
in
sequence
to
indicate
how
much
of
a
major
cycle
division
is
complete.
For
example,
the
VENT
(decompression)
portion
of
the
cycle
is
60
seconds
long.
Since
there
are
10
bar
graph
segments,
each
representing
10%
of
the
cycle,
a
new
segment
will
light
every
6
seconds
during
decompression.
Automatic
Pressure
Adjustment
The
SCD
5325
Controller
features
microprocessor
controlled
automatic
pressure
adjustment
that
not
only
sets
the
pressure
automatically,
but
maintains
the
set
pressure
no
matter
how
the
pa-
tient
moves
or
changes
position.
After
the
start-up
sequence,
the
Controller
will
set
itself
at
45mmHg
and
display
that
as
the
set
pressure.
The
SETTING
LED
will
light
indicating
that
the
Controller
is
in
the
process
of
adjust-
ing
the
actual
pressure
to
match
the
set
pressure.
Within
four
cycles,
the
SETTING
LED
will
turn
off
and
the
RUN
LED
will
come
on,
indicating
that
the
actual
pressure
is
within
2mmHg
of
the
set
pressure.
If
a
pressure
other
than
45mmHg
is
desired,
the
set
pressure
may
be
changed
by
pressing
either
the
Up
or
Down
arrow
buttons
located
to
the
right
of
the
display.
Each
time
the
UP
or
DOWN
button
is
pressed,
the
set
pressure
will
be
raised
or
lowered
ImmHg
respectively.
Pressing
and
holding
one
of
the
buttons
for
at
least
two
seconds
will
cause
the
set
pressure
to
scroll
rapidly.
Whenever
the
set
pressure
is
changed,
the
SETTING
LED
will
come
on
while
the
Controller
is
matching
the
actual
pressure
to
the
set
pressure.
When
the
actual
pressure
is
within
2mmHg,
the
RUN
LED
will
light.
NOTE:
Even
after
the
RUN
LED
is
on,
the
Controller
will
continue
to
make
small
adjustments
in
order
to
more
perfectly
match
the
set
pressure.
Pressure
Monitoring
The
LED
display
that
is
used
to
show
the
set
pressure
can
also
be
used
to
display
the
actual
pressure.
Press
the
center
of
the
black
bar
area
to
the
left
of
the
display
for
two
seconds.
This
will
cause
the
display
to
change
to
Pressure
Monitor
Mode.
The
Controller
will
stay
in
this
mode
throughout
the
current
compression
portion
of
the
cycle
(or
the
next
compression
cycle
if
the
button
is
pressed
during
the
VENT
portion
of
the
cycle).
The
last
reading
of
the
compres-
sion
portion
of
the
cycle
will
be
displayed
for
thirty
seconds.
At
the
beginning
of
the
next
infla-
tion
cycle
the
display
will
revert
to
showing
the
set
pressure.
When
the
Controller
is
in
the
Pressure
Monitor
Mode,
a
decimal
point
will
flash
on
either
side
of
the
seven
segment
display,
indicating
that
the
actual
pressure
is
being
displayed.
Fault
Conditions
[rms
Fault
Messages:
Code
Fault
Type
Description
SL
System
Low
There
is
less
than
4mmHg
pressure
in
the
System.
The
Controller
will
shut
off
and
display
this
code.
Potential
Causes
eTubing
is
not
properly
connected.
eThere
is
a
leak
inside
the
Controller.
Corrective
Actions
¢Ensure
proper
Tubing
connections.
«Turn
the
Controller
off
and
restart.
If
the
Controller
displays
the
same
fault,
the
unit
requires
servicing.
LO
Low
The
Controller
is
unable
to
bring
the
pressure
up
to
within
2mmHg
of
the
set
pressure
during
five
consecutive
cycles.
The
pressure
in
the
Sleeves
is
consistently
below
the
set
pressure.
The
Controller
will
shut
off
and display
this
code.
Potential
Causes
eTubing
is
not
properly
connected.
eSleeves
are
too
loose.
eFlow
control
valve
is
stuck.
Corrective
Actions
«
Ensure
proper
Tubing
connections.
e
Apply
Sleeves
so
that
only
two
fingers
fit
snugly
between
each
Sleeve
and
the
patient’s
leg.
eTurn
the
Controller
off
and
restart.
If
the
Controller
displays
the
same
fault,
the
unit
requires
servicing.
SH
System
Pressure
has
exceeded
90mmHg
in
the
ankle
chamber
during
High
the
compression
portion
of
the
cycle.
The
Controller
will
shut
off
and
display
this
code.
'
When
the
microprocessor
detects
a
fault
condition,
it
interrupts
the
normal
operation
of
the
Controller,
closes
all
the
solenoid
valves,
displays
a
fault
code,
and
sounds
an
audible
alarm.
(The
alarm
may
be
disabled
by
pressing
the
Audible
Alarm
button
after
the
Controller
is
running.)
When
the
Controller
is
in
the
FAULT
mode,
it
can
be
reset
by
turning
the
power
off
and
then
back
on.
Code
Fault
Type
Description
SH
System
High
(cont.)
Potential
Causes
*Tubing
is
kinked.
Sleeves
are
too
tight.
+
The
set
pressure
has
been
changed
too
rapidly
from
a
very
low
pressure
to
a
very
high
pressure.
Corrective
Actions
eStraighten
out
kinked
Tubing.
*
Apply
the
Sleeves
so
that
two
fingers
can
fit
snugly
between
each
Sleeve
and
the
patient's
leg.
eTurn
the
Controller
off
and
restart.
If
the
Controller
displays
the
same
fault,
the
unit
reguires
servicing.
HI
High
The
Controller
is
unable
to
bring
the
pressure
down
to
within
2mmHg
of
the
set
pressure
during
five
consecutive
cycles.
The
pressure
in
the
Sleeves
is
consistently
above
the
set
pressure.
The
Controller
will
shut
off
and
display
this
code.
Potential
Causes
Sleeves
are
too
tight.
eFlow
control
valve
is
stuck.
Corrective
Actions
«
Apply
Sleeves
so
that
two
fingers
can
fit
snugly
between
each
Sleeve
and
the
patients
leg.
*Turn
the
Controller
off
and
restart.
If
the
Controller
displays
the
same
fault,
the
unit
reguires
servicing.
dl
Internal
Diagnostic
One
If a
power
transducer
failed
shorted,
the
associated
solenoid
valve
would
stay
open.
The
microprocessor
would
detect
this
condition,
shut
the
Controller
off
and
display
this
code.
The
Controller
should
be
returned
to
the
manufacturer
for
re-
pair.
d2
Internal
Diagnostic
Two
Upon
start-up,
the
microprocessor
performs
diagnostic
tests.
If
the
Controller
fails
to
pass
all
of
these
tests,
it
will
not
start
and
this
fault
code
will
be
displayed.
The
Controller
should
be
returned
to
the
manufacturer
for
re-
pair.
TTT
ㆍ ㆍ
Code
Fault
Type
Description
d3
Internal
This
fault
is
detected
only
during
special
test
conditions
Diagnostic
and
should
not
occur
during
normal
operation.
Three
The
Controller
should
be
returned
to
the
manufacturer
for
repair.
d4
Internal
This
fault
is
detected
only
during
special
test
con-
Diagnostic
ditions
and
should
not
occur
during
normal
operation.
Four
The
Controller
should
be
returned
to
the
manufacturer
for
repair.
Watchdog
Circutt
If
the
Microprocessor
cannot
continue
normal
software
execution,
the
watchdog
will
trip.
This
causes
the
Controller
to
go
into
reset
and
restart
normal
operation.
If
the
cause
of
the
disruption
is
still
present,
the
unit
will
continue
to
attempt
to
reset,
which
will
cause
the
alarm
to
beep
at
a
1.0
Hz
rate.
If
the
cause
of
the
disruption
was
transient,
such
as
a
high
energy
RF
pulse,
the
Controller
will
restart.
This
will
cause
all
of
the
settings
to
revert
to
their
default
states,
i.e.
the
COOLING
will
be
OFF,
the
AUDIBLE
ALARM
will
be
ON,
and
the
pressure
will
be
set
at
45mmHg.
Contraindications
The
SCD
Compression
System
may
not
be
recommended
for
patients
with
the
following:
1.
Any
local
leg
condition
in
which
sleeves
would
interfere
such
as:
a.
Dermatitis
b.
Vein
ligation
(immediate
postoperative)
c.
Gangrene
d.
Recent
skin
graft
2.
Severe
arteriosclerosis
or
other
ischemic
vascular
disease.
3.
Massive
edema
of
legs
or
pulmonary
edema
from
congestive
heart
failure.
4.
Extreme
deformity
of
leg.
5.
Suspected
existing
deep
venous
thrombosis.
Cautions
1.
When
this
device
is
used
in
the
Operating
Room,
keep
Sleeve
Cooling
OFF
to
maintain
air
guiescence.
2.
Federal
law
restricts
this
device
to
sale
by
or
on
the
order
of
a
physician.
3.
Explosion
Hazard.
Do
not
use
in
the
presence
of
flammable
anesthetics.
Service
and
Maintenance
Introduction
The
service
technician
should
be
familiar
with
the
operator's
portion
of
this
manual
and
the
operating
principles
of
the
SCD
5325
Controller.
The
fault
codes
displayed
by
the
Controller
are
useful
in
diagnosing
service
problems.
If
a
Controller
is
to
be
returned
for
service,
a
de-
scription
of
any
fault
code
displayed
should
accompany
the
unit.
This
manual
describes
service
procedures
to
the
board
level.
If
a
component
failure
on
a
circuit
board
is
suspected,
the
unit
should
be
returned
for
service.
It
is
recommended
that
the
instru-
ment
be
returned
with
the
circuit
board
in
place,
as
removal
of
the
board(s) involves
additional
risk
of
mechanical
damage
and
damage
from
electrostatic
discharge.
Warranty
and
Factory
Service
The
Kendall
Healthcare
Products
Company
warrants
that
your
SCD
5325
Controller
is
free
from
defective
material
and
workmanship.
Our
obligation
under
this
warranty
is
limited
to
the
repair
of
instruments
returned
to
the
service
address
indicated
below,
transportation
charges
prepaid,
within
one
year
of
delivery
to
the
original
purchaser.
Specifically,
we
agree
to
service
and
or
adjust
any
instrument
as
required
if
returned
for
that
purpose,
and
to
replace
and
repair
any
part
which,
upon
our
examination,
is
proven
to
have
been
defective.
This
warranty
does
not
apply
to
the
Tubing
Assembly
or
the
individual
disposable
leg
Sleeves,
or
tc
equipment
damaged
through
shipping,
tampering,
negligence,
or
misuse,
including
liquid
immersion,
autoclaving,
or
ETO
sterilization.
THIS
LIMITED
WARRANTY
DOES
NOT
COVER,
AND
IS
INTENDED
TO
EXCLUDE,
ANY
AND
ALL
LIABILITY
ON
THE
PART
OF
THE
COMPANY,
WHETHER
UNDER
THIS
LIM-
ITED
WARRANTY
OR
ANY
WARRANTY
IMPLIED
BY
LAW,
FOR
ANY
INDIRECT
OR
CONSEQUENTIAL
DAMAGES
FOR
BREACH
HEREOF
OR
THEREOF.
EXCEPT
AS
EX-
PRESSLY
PROVIDED
ABOVE
IN
THE
LIMITED
WARRANTY,
THE
COMPANY
HEREBY
NEGATES
AND
DISCLAIMS
ALL
EXPRESS
AND
IMPLIED
WARRANTIES,
INCLUDING
THE
WARRANTIES
OF
MERCHANTABILITY
AND
FITNESS FOR
A
PARTICULAR
PUR-
POSE.
Some
states
do
not
allow
the
exclusion
or
limitation
of
incidental
or
consequential
damages,
sc
the
foregoing
limitation
or
exclusion
regarding
damages
may
not
apply.
Also,
this
Limited
Warranty
gives
you
specific
legal
rights,
and
you
may
also
have
other
rights
which
vary
from
state
to
state.
THIS
SERVICE
MANUAL
IS
INTENDED
FOR
USE
AS
A
GUIDE
TO
TECHNICALLY
QUAL
FIED
PERSONNEL
WHEN
EVALUATING
INSTRUMENT
MALFUNCTIONS.
IT
IS
NOT
TC
BE
CONSTRUED
AS
AUTHORIZATION
TO
PERFORM
WARRANTY
REPAIRS.
UN-
AUTHORIZED
SERVICE
WILL
VOID
THE
WARRANTY.
CALIBRATION
USING
THE
PROCEDURES
OUTLINED
IN
THIS
MANUAL
VOIDS
THE
FACTORY
CALIBRATION
WARRANTY.
Instruments
requiring
warranty
repairs
must
be
shipped,
prepaid
and
insured,
to
the
Service
Center.
The
Kendall
Healthcare
Products
Company
maintains
service
facilities
with
the
capa-
bility
to
promptly
repair
the
SCD
5325
Controller.
In
the
event
of
any
service
maintenance
problem,
contact
the
Service
Manager.
The
toll-free
number
is
(800)
765-4324.
If
the
instrument
is
to
be
returned
for
service,
please
call
the
above
number
to
obtain
a
return
materials
authori-
zation
number
and
send
it
prepaid
and
insured,
in
the
original
carton
to:
Service
Manager
Electronic
Assembly
Corporation
585
Enterprise
Drive,
Bldg.
#4
Neenah,
WI
54956
Filter
Maintenance
There
are
two
filters
used
in
the
SCD
5325
Controller—an
external
filter
and
a
compressor
filter.
Both
filters
can
be
accessed
by
removing
the
rear
cover
of
the
Controller.
To
do
this,
remove
the
two
screws
at
the
back
of
the
Controller.
It
is
very
important
that
the
external
air
filter
be
cleaned
frequently
to
insure
continued
trouble-free
operation.
The
Controller
should
never
be
run
without
the
filter
in
place.
To
clean
the
external
filter,
lift
it
from
the
Controller
and
brush
loose
dust
and
lint
from
the
surface.
Wash
the
filter
in
a
mild
detergent
solution,
dry
thoroughly,
and
reinstall.
Removal
of
the
rear
cover
also
exposes
the
compressor
filter.
This
filter
should
be
cleaned
monthly
or
more
frequently
if
the
external
filter
shows
frequent
clogging.
Remove
the
screw
in
the
center
of
the
filter
housing
and
remove
the
housing.
The
filter
is
mounted
on
fingers
on
the
inside
of
the
housing.
Remove
the
filter
element
from
the
housing
and
wash
in
a
mild
deter-
gent
solution,
rinse
and
dry
thoroughly.
Do
not
use
oil
on
the
filter.
Inspect
the
filter
for
lint
before
reassembly.
Lint
suppression
is
essential
to
prevent
the
malfunction
of
the
pump
and
solenoid
valves.
Reassemble
carefully
making
sure
that
the
housing
is
properly
seated
on
the
pump
casting.
Replace
the
rear
cover
and
retaining
screws.
Ventilation
Obstruction
of
the
back
and
rear
vents
should
be
avoided.
Free
flow
of
air
is
necessary
to
prevent
overheating
and
premature
component
failure.
Fuses
Blown
fuses
should
be
replaced
with
ones
of
the
proper
rating
and
type.
This
instrument
uses
two
3AG
slow-blow
fuses:
1.
1.0-ampere
2.
0.4-ampere
If
a
fuse
blows
a
second
time,
it
should
be
presumed
that
the
instrument
is
defective
and
requires
further
service.
CAUTION:
Unplug
the
Controller
before
removing
the
fuses.
Electrical
Safety
Periodic
inspection
should
include
a
resistance
check
from
the
power
plug
grounding
prong
tc
the
metal
chassis
inside
the
instrument.
This
resistance
should
not
exceed
0.1
ohm.
If
ground
resistance
exceeds
this
value
or
the
insulation
integrity
of
the
unit
has
been
compromised
through
mechanical
damage,
the
Controller
should
be
returned
to
the
service
center
for
testing
and
repair.
CAUTION:
Be
sure
that
the
Controller
is
disconnected
from
the
power
source
before
removing
the
top
cover.
A
potential
SHOCK
HAZARD
exists
when
the
top
cover
is
removed
even
with
the
unit
turned
off.
Cleaning
The
Controller
case
can
be
cleaned
with
a
soft
cloth
dampened
with
water.
If
necessary,
a
mild
disinfectant
and/or
detergent
can
be
used,
but
excess
fluid
should
be
avoided.
The
Controller
should
be
wiped
with
a
clean,
dry
cloth
afterward.
Do
not
immerse
in
water.
The
SCD
5325
Controller
cannot
be
effectively
sterilized
by
liquid
immersion,
autoclaving,
or
ETO
sterilization.
To
do
so
will
irreparably
damage
the
Controller.
Electrical/Electronics
Description
The
electronics
of
the
instrument
are
located
on
two PC
boards
that
can
be
found
back
to
back,
beneath
the
membrane
switch
panel
in
the
top case
cover.
There
is
no
high
voltage
on
the
PCB’s.
The
upper
board
is
the
display
board
and
contains
the
LED’s
and
associated
electronics
which
display
information
about
the
state
of
the
Controller
during
normal
operation,
as
well
as
in
the
fault
mode
or
the
various
calibration
and
diagnostic
modes.
The
lower
board
is
the
control
board.
It
contains
voltage
regulation
circuits,
analog
condition-
ing
circuits,
the
pressure
transducer,
the
microprocessor
and
the
input
circuits
to
read
the
switches.
The
board
also
contains
output
drivers
to
turn
on/off
the
solenoid
valves,
control
the
flow
control
valve
and
sound
the
alarm.
A
pressure
transducer
provides
the
microproces-
sor
information
on
the
operating
pressure
of
the
system,
which
it
uses
to
modify
the
flow
of
ail
through
the
flow
control
valve.
rator
input
is
provided
through
the
membrane
switch
panel.
Component
failure
will
result
in
de-energizing
the
solenoid
valves
and
the
closing
of
the
flow
control
valve.
This
will
release
pressure
from
the
attached
leg
sleeves.
Pneumatics
Description
The
compressor,
driven
by
a
low
noise
linear
motor,
runs
continuously
while
the
Controller
is
on.
Air
can
be
directed
from
the
compressor
to
the
sleeve
cooling
chambers
during
the
60
second
vent
phase
by
pressing
the
Sleeve
Cooling
button
on
the
membrane
switch
panel.
This
causes
the
solenoid
valve
SV4
to
be
energized
during
the
VENT
phase.
Air
flow
to
the
solenoid
valve
manifold
assembly
is
controlled
by
the
flow
control
valve
which
is
driven
by
the
linear
stepper
motor
in
response
to
step
patterns
from
the
microproces-
sor.
From
the
manifold
assembly,
it
is
gated
to
the
sleeve
chambers
during
the
11
second
compression
phase
by
energizing
solenoid
valves
SV1,
SV2,
and
SV3
in
seguence.
At
the
end
of
this
period,
all
three
solenoid
valves
are
de-energized
simultaneously
which
disconnects
the
compressor
from
the
sleeves
and
allows
the
valves
to
vent
to
atmosphere.
The pressure
transducer
monitors
the
pressure
in
the
ankle
portion
of
the
circuit
and
provides
data
input
to
the
microprocessor
for
closed
loop
control.
Port
Identity
The
Tubing
Set
connecting
the
Sleeves
to
the
Controller
is
attached
to
the
fitting
on
the
front
of
the
Controller
in
the
lower
left
hand
corner.
Inside
this
fitting
are
four
ports
which
are,
from
left
to
right:
ANKLE,
COOLING,
CALF,
and
THIGH.
(See
Schematic.)
Controller
Start-Up
Routine
PHASE
I:
When
the
Controller
is
turned
on,
it
commences
a
series
of
tests
lasting
six
sec-
onds:?
1.
All
LED’s
light
and
the
beeper
sounds
for
0.5
seconds.
2.
The
FAULT
and
two
Seven
Segment
LED's
light
(Displaying
“88”).
Then
the
FAULT
LED
extinguishes.
3.
The
Cycle
Monitor
LED’s
light
and
extinguish.
4.
The
SETTING
and
RUN;
COOLING;
and
AUDIBLE
ALARM
LED’s
light.
The
Beeper
sounds
briefly
and
those
LED’s
extinguish.
PHASE
II:
The
set
pressure
is
displayed
and
the
SETTING
LED
flashes.
During
this
phase,
the
flow
control
valve
is
adjusted
to
a
predetermined
start
position.
This
process
will
take
from
2
to
6
seconds,
depending
upon
the
position
of
the
valve
when
the
Controller
was
last
turned
off.
PHASE
III:
The
normal
operating
cycle
begins
with
ankle
inflation.
At
this
time,
the
AU-
DIBLE
ALARM
indicator
relights.
*
Detection
of
inoperative
LED's
and
the
Beeper
function
is
the
user's
responsibility.
The
start-up
routine
also
tests
micro-
processor
function
and
system
memory.
If
a
fault
condition
is
detected,
either
a
[D(n)]
fault
code
will
be
displayed
or
the
unit
will
repeatedly
go
into
reset
which
will
result
in
a
long beep
at
a
1
Hz
rate.
10
Calibration/Test
Methods
Introduction
The
SCD
5325
Controller
has
several
special
calibrating
and
test
modes
that
can
be
used
to
verify
the
pressure
transducer
calibration
and
proper
function
of
the
flow
control
valve
and
it
drive
circuits.
They
can
also
verify
the
microprocessor,
solenoid
valve
and
pneumatic
functio.
ality.
Calibration
Procedure
Equipment
Required:
A
regulated
air
source
with
a
constant
output
pressure
(less
than
1%
vari:
tion)
set
at
45.0mmHg.
.
NOTE:
The
pressure
transducer
used
in
the
SCD
5325
Controller
is
a
state-of-the-art,
highly
precise,
and
nearly
drift-free
device.
It
is
not
expected
to
require
recalibration
for
several
years
of
continuous
use
Performing
the
following
calibration
procedure
voids
the
factory
calibration
warranty.
1.
Unplug
the
Controller.
2.
Remove
the
rear
filter
cover
and
external
filter.
(See
FILTER
CLEANING.)
3.
Turn
the
Controller
over
and
remove
the
four
screws
located
around
the
shelf
bottom.
4.
Carefully
turn
the
Controller
right
side
up
and
rotate
it
until
the
front
is
facing
you.
5.
Gently
lift
the
top
cover
straight up
until
it
just
clears
the
internal
components.
Tilt
it
to
the
left
until
it
can
be
rested
on
its
left
side.
(Make
sure
the
various
electrical
and
pneumatic
connections
between
the
control
PCB
and
the
rest
of
the
unit
are
not
dislodged.)
6.
Carefully
disconnect
the
Luer
Lock
connector
in
the
middle
of
the
Tubing
that
is
attached
tc
the
Pressure
Transducer.
7.
Plug
the
unit
into
a
wall
outlet.
CAUTION:
ELECTRICAL
SHOCK
HAZARD.
Do
not
touch
the
electrical
components
on
the
chassis.
The
PCBs
are not
at
line
voltage.
8.
Locate
the
variable
potentiometer
on
the
control
PCB.
This
is
the
calibration
adjustment.
9.
Place
the
Controller
in
the
calibration
mode
by
pressing
and
holding
the
hidden
Monitor
Bt
(the
center
of
the
black
bar
area
to
the
left
of
the
display;
see
PRESSURE
MONITORING)
wt
turning
on
the
Controller.
The
Controller
will
cycle
from
ankle
to
calf
to
thigh
to
vent
every
seconds.
10.
Using
a
mating
Luer
fitting,
connect
the
calibrated
air
pressure
source
to
the
Pressure
Transducer.
11.
The
seven
segment
display
should
read
45mmHg.
11
12.
If
the
display
does
not
read
45mmHg,
adjust
the
potentiometer
until
the
display
shows
45mmHg.
Center
the
adjustment
so
that
turning
the
potentiometer
an
equal
distance
in
either
direction
causes
the
display
to
shift
to
the
next
higher
or
lower
number.
13.
Carefully
remove
the
calibrated
air
source
from
the
pressure
transducer
and
re-attach
the
tubing
from
the
Controller.
14.
Carefully
replace
the
top
cover
and
turn
the
Controller
over.
15.
Replace
the
four
screws.
(Do
not
over-tighten.)
Replace
the
external
filter
and
the
rear
filter
cover.
12
Valve
Function
Test
The
following
describes
a
Valve
Function
Test
which
can
be
used
to
exercise
the
flow
contrc
valve
under
the
control
of
the
microprocessor.
This
test
is
not
part
of
the
normal
testing
and
maintenance
routine,
but
can
be
used
in
the
event
of
disassembly
to
verify:
eThe
correct
wiring
and
connection
of
the
solenoid
valves.
_
©The
correct
wiring
and
connection
of
the
flow
control
valve.
eThe
correct
orientation
and
connection
of
the
pneumatic
circuit.
eThat
there
are
no
leaks
or
blockage
of
the
pneumatic
circuit.
eThat
the
solenoid
and
flow
control
valves
are
operating
correctly.
Equipment
Required
e
Four
Dwyer
Flow
Rate
Gauges
#RMC-101
(Range
of
5
to
50
SCFH).
Other
flow
meters
1
work,
but
will
require
some
experimentation
to
determine
the
optimum
range.
(The
out
is
influenced
by
the
back
pressure
of
the
flow
meters.)
e
One
Harness
Coupling
-
Kendall
part
number
HC-78.
e
Four
lengths
of
flexible
tubing
-
3/16"ID.
X
24"
Vinyl
or
Rubber.
Assemble
as
shown
in
the
illustration
located
in
the
Appendix.
Procedure
1.
Attach
the
Flow
Meter
Assembly
to
the
Tubing
fitting
on
the
front
of
the
SCD
Controlle
2.
Press
and
hold
the
Up
and
Down
arrow
buttons
while
turning
on
the
Controller.
This
places
the
Controller
in
the
Stand-by
Mode.
The
Display
will
show
“Sb.”
3.
Press
the
Audible
Alarm
button.
eThe
Beeper
will
sound
seven
times.
*The
ankle
solenoid
valve
will
open
and
the
flow
control
valve
will
begin
to
open.
This
1
be
indicated
by
the
sequential
lighting
of
the
segments
of
the
ten
segment
display
that
is
part
of
Cycle
Monitor.
The
number
of
segments
lit
is
an
approximate
indication
of
the
position
of
the
valve.
For
example,
five
segments
lit
indicates
the
valve
is
half
open.
As
the
valve
opens,
the
ank:
flow
meter
will
show
a
corresponding
smooth
rise.
*The
beeper
will
sound
and
the
flow
control
valve
will
pause
for
five
seconds
when
hal!
way
open.
eThe
flow
control
valve
will
continue
to
open.
When
it
is
fully
open,
the
beeper
will
sor
and
the
valve
will
pause
for
five
seconds.
*The
flow
control
vaive
will
close
to
the
halfway
point,
the
beeper
will
sound
and
the
valve
will
pause
for
five
seconds.
13
ve
eThe
flow
control
valve
will
close
all
the
way.
The
ankle
solenoid
valve
will
close
and
the
calf
solenoid
valve
will
open.
eThe
sequence
will
be
repeated
for
the
calf,
thigh
and
vent
circuits
except
that
the
flow
control
valve
will
not
pause
at
the
halfway
point.
A
corresponding smooth
rise
should
be
seen
on
the
appropriate
flow
meters
for
the
calf
and
thigh
circuits.
The
vent
circuit
does
not
pass
through
the
flow
control
valve,
so
the
associated
meter
will
snap
to
a
higher
value
immediately
and
stay
there
during
it’s
portion
of
the
test.
eWhen
the
vent
circuit
has
completed
its
cycle,
the
Controller
will
return
to
the
Stand-by
Mode.
DISASSEMBLY/REASSEMBLY
Instruction
Card
Replacement
1.
Remove
the
two
rear
filter
cover
screws
and
lift
off
the
filter
cover.
2.
Pull
the
cord
from
the
notch
located
between
the
case
top
and
the
handle.
3.
Insert
the
new
cord
through
the
notch
from
the
handle
side
and
apply
a
metal
crimp
or
tie
a
knot
in
the
end
of
the
cord.
4.
Replace
the
filter
cover
and
reinstall
the
two
filter
cover
screws.
Case
Removal
CAUTION:
SHOCK
HAZARD.
Disconnect
line
cord
from
the
power
supply.
CAUTION:
Disassembly
of
the
case
and
particularly
the
disconnection
of
pneumatic
and/or
electronic
components
can
disrupt
the
function
and
calibration
of
the
instrument.
It
is
strongly
recommended
that
the
Calibration
Check
and
Valve
Function
Test
be
performed
upon
reassembly.
Remove
the
case
components
in
the
following
sequence:
(See
illustration
located
in
the
Appendix.)
1.
Remove
the
rear
filter
cover.
To
remove
the
filter
cover,
remove
the
two
screws
located
at
the
rear
of
the
Controller,
and
lift
off.
2.
Remove
the
external
filter.
3.
Remove
top
cover.
To
remove
the
top
cover,
turn
the
Controller
upside
down
and
remove
the
four
screws
located
at
the
four
corners
of
the
raised
shelf.
Hold
the
cover
to
the
base
and
turn
the
Controller
right
side
up.
With
the
Controller
facing
you,
lift
the
cover
and
rotate
it
to
your
left
90
degrees
and
lay
it
on
its
side.
14
Note
the
location
and
orientation
of
the
connectors
from
the
base
components
on
the
cı
trol
PCB.
Remove
the
connectors
by
gently
pulling
straight
out.
Very
gently
disconnect
the
Leur
Lok
that
connects
the
pneumatic
circuit
to
the
pressur
transducer.
Circuit
Board
Removal
The
control
and
display
PC
boards
are
located
on
the
under
side
of
the
case
top,
beneath
th
control
panel.
The
boards
are
stacked
with
the
control
board
being
the
outer
board
when
th
case
top
is
viewed
from
the
bottom.
CAUTION:
Use
a
ground
strap
when
handling
any
electronic
components.
1.
Note
the
location
and
orientation
of
all
the
pneumatic
and
electrical
connections
to
the
chassis.
2.
Disconnect
all
the
pneumatic
and
electronic
leads
to
the
chassis.
3.
Remove
the
four
mounting
screws
located
at
the
four
corners
of
the
control
board
and
ge
separate
the
boards
until
the
connector
between
the
two
boards
is
free.
4.
Remove
the
mounting
nut/spacers
holding
the
display
board
and
lift
the
display
board
«
CAUTION:
It is
not
recommended
that
components
on
the
PC
boards
be
removed
or
replaced.
If
a
ci
board
is
suspected
of
being
faulty,
it
can
be
returned
for
repair
or
replacement
by
calling
the
toll-free
service
number
(800)
765-4324.
Circuit
Board
Installation
CAUTION:
Use
a
ground
strap
when
handling
any
electronic
components.
1.
Carefully
align
the
display
board
with
the
mounting
screws.
2.
Replace
the
four
mounting
nut/spacers
to
secure
the
display
board.
3.
Align
the
mating
connectors
on
the
display
and
control
boards.
Gently
press
them
togethe
4.
Replace
the
four
mounting
screws
to
secure
the
control
board.
Compressor
The
Compressor
is
driven
by
a
linear
motor
integral
to
the
unit.
Air
is
pumped
by
a
spring
loaded
piston
oscillating
in
a
60
Hertz
magnetic
field.
With
the
outlet
port
open
and
line
vol
at
115
volts,
the
compressor
will
draw
approximately
1
ampere
rms.
If
the
outlet
port
is
clos:
the
current
will
drop
to
approximately
0.75
amperes
rms.
15
uit
ge
[The
field
coil
is
energized
from
the
power
line
through
a
rectifying
diode.
If
an
ohmmeter
is
used
to
test
field
coil
continuity,
it
must
be
polarized
to
obtain
forward
conduction
of
the
diode.
Further,
the
voltage
applied
in
a
continuity
test
must
be
adequate
to
produce
forward
conduc-
tion.
The
Diode
Test
Function
of
digital
multimeters
can
be
used
for
this
test.
Some
ohmmeters
are
not
suitable.
elf
the
diode
is
shorted,
the
compressor
will
not
function;
however,
the
current
draw
will
be
approximately
normal.
«The
diode
is
located
inside
the
case
and
its
replacement
would
require
disassembly
of
the
compressor.
This
should
not
be
attempted.
Special
jigs
and
fixtures
are
required
to
insure
proper
alignment
during
reassembly.
elf
the
diode
is
shorted,
it
is
possible
to
connect
a
second
diode
in
series,
but
located
external
to
the
compressor.
Such
a
repair
should
be
attempted
only
by
an
experienced
technician
and
in
a
configuration
that
does
not
compromise
electrical
safety.
The
diode
polarity
does
not
affect
compressor
function.
«The
diode
rating
should
be
3
amperes
and
at
least
800
volts
PIV.
NOTE:
The
compressor
used
in
the
instrument
is
not
a
user
serviceable
component.
Special
jigs
and
fixtures
are
required
for
assembly
to
ensure
proper
alignment.
Do
not
disassemble.
Solenoid
Valves
The
solenoid
valve
that
connects
the
pump
to
the
Sleeve
Cooling
Port
is
a
2-way,
normally
closed
type.
When
energized,
it
passes
air
to
the
port;
when
de-energized,
flow
is
blocked.
Its
coil
resistance
is
about
90
ohms.
The
solenoid
valves
connecting
air
flow
from
the
flow
control valve
to
the
ANKLE,
CALF,
and
THIGH
ports
are
arranged
in
a
block
and
are
of
the
3-way,
normally
closed
type.When
energized,
these
valves
pass
air
to
their
respective
Sleeve
ports.
When
de-energized,
pump
air
is
blocked
and
air
pressure
in
the
Sleeves
is
released
through
the
port
on
the
top
of
that
particular
valve.
Coil
resistance
for
each
of
these
three
valves
is
about
80
ohms.
The
coils
on
all
four
valves
are
removable
by
removing
the
nut
at
the
top
of
the
valve.
Any
debris
in
the
air
lines
could
cause
mechanical
malfunction
of
the
solenoid
valves.
If
_
this
is
suspected,
the
valve
tubing
should
be
disconnected
and
the
valve
flushed
with
filtered
compressed
air
through
the
port
while
energizing
the
valves
respectively
from
a
24
volt
supply.
Double
filtration
of
incoming
air
guards
against
debris
entering
the
compres-
sor.
If
debris
is
present,
it
may
indicate:
a.
Failure
to
clean
the
filters
when
needed.
b.
Physical
breakdown
of
some
component
of
the
pneumatic
circuit,
for
example,
degradation
of
a
section
of
tubing.
Low
voltage
from
the
24-volt
supply
can
also
cause
solenoid
valve
malfunction.
Normal
solenoid
voltage
requirement
is
24
to
32
VDC.
16
Case
Reassembly
1.
Place
the
case
base,
with
the
complete
chassis
installed,
on
the
bench
in
front
of
you
wit
front
of
the
Controller
towards
you.
2.
Place
the
case
top
on
its
left
side
to
the
left
of
the
case
base.
The
front
of
the
case
top
shot
be
toward
you
with
the
under
portion
of
the
case
top
towards
the
case
base.
*Reconnect
all
of
the
electrical
connections
in
the
proper
location
and
orientation
of
leads
from
the
chassis
components.
Replace
the
connectors
by
gently
pushing
strai
in.
*Reconnect
the
Luer
Lok
by
rotating
both
connectors
one-quarter
turn
counterclock
Then
rotate
clockwise
to
lock.
Particular
care
should
be
taken
to
avoid
bending
th
on
the
pressure
transducer.
3.
Lift
the
case
top
and
place
it
over
the
case
base.
Carefully
align
the
two
halves.
Turn
the
closed
Controller
over
and
reinstall
the
four
screws.
«Turn
the
unit
right
side
up
and
perform
the
Valve
Function
Test
and
Calibration
C
Procedure.
17
he
зе
it
ise.
eads
SCD™
5325
CONTROLLER
Specifications
Model
#
:
5325
UL
Listing:
Built
to
UL
544
Standard
Compression
Type:
Sequential,
Gradient
Pressure
Compression
Cycle:
11
Seconds
Compression,
60
Seconds
Decompression
Preset
Pressure:
45mmHg
Recommended
Pressure
Range:
35mmHg
-
55mmHg
Audible/Visual
Alarms:
Low
Pressure,
High
Pressure,
Internal
Electronics
Malfunction
Sleeve
Cooling
Function:
Yes
Cycle
Monitor:
Yes
Power
Cord:
Hospital
Grade
Plug
Controller
Height:
6-1/2”
Controller
Width:
8-5/8”
Controller
Depth:
13”
Weight:
14.3
lbs.
Voltage:
115
VAC,
115
VA,
60Hz
Shipping
Unit:
Each
Ship Case
Dimensions:
Height,
11”;
Width,
10”;
Depth:
15-1/2”
Shipping
Weight:
17.6
lbs.
Tubing
Assembly:
Included
Operator’s
Instructions:
Included
Service
Manual:
Included
16
|
|
Flow
Meter
Assembly
=
一
一
-一
一
一
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