kENDALL SCD SEQUEL tyco Healthcare 6325 Installation and operating instructions

Operation &
Service Manual
MODEL 6325
COMPRESSION SYSTEM
#YCO / Healthcare
KENDALL

Parts Listing SCD Sequel Model 6325
To order repair parts listed here, call Kendall/Tyco Healthcare at [phone]. Contact Customer
Service for availability of parts not listed below.
Description Order Part Number
POWER SUPPLY PC BOARD 7774006780
CPU PC BOARD 7774006840
TRANSDUCER - PRESSURE 7774020504
COMPRESSOR (THOMAS, GAST) 7774010283
COMPRESSOR FILTER 7774031569
COMPRESSOR MUFFLER 7774031575
COMPRESSOR CABLE 7774090530
VALVE ASSEMBLY (KIP, SKINNER) 7774010300
TRANSFORMER 7774010301
FRONT ENCLOSURE ASSEMBLY (CASE, FOAM, LABELS) 7774109780
FRONT ENCLOSURE 7774031601
REAR ENCLOSURE ASSEMBLY (CASE, FOAM, LABELS) 7774109790
REAR ENCLOSURE 7774031600
NYLON HOOK PAD 7774170580
FAN GUARD 7774031602
FAN FILTER 7774031572
HOOK (BED) 7774031567
CASE RUBBER FEET 7774031570
ROCKER SWITCH 7774070156
BOARD TO BOARD CABLE 7774080385
POWER CORD ASSEMBLY 7774090529
STRAIN RELIEF 7774131980
TUBING, TRANSDUCER (1/8 X 1/4) 7774090551
TUBING,5/32 X 9/32 7774090579
TUBING,(COMP- MUFFLER), 5.50" 7774090540
FUSEHOLDER 7774010289
FUSE, .75 AMP 7774010290
SHRINK TUBING (FUSEHOLDER) 7774090533
FAN ASSEMBLY 7774109190
MEMBRANE SWITCH 7774070163
CAUTION LABEL 7774181923
GROUNDING LABEL 7774181924
OPERATING INSTRUCTIONS LABEL 7774181947
QUIET FOAM, LOWER FRONT 7774031576
QUIET FOAM, MIDDLE FRONT 7774031577
QUIET FOAM, UPPER FRONT 7774031578
QUIET FOAM, BOTTOM 7774031579
QUIET FOAM, CHASSIS 7774031580
QUIET FOAM, END 7774031599
F181957

Operation & Service Manual
MODEL 6325
Table of Contents
M GENERAL OPERATING INSTRUCTIONS
e Pre-Operation Check ....................................... 1
* Use of Bed Hook............................................ 1
+ Operation ....................................,..,.,,,,,4. 1
e Cycle Monitor ..........................,,.................. 1
© Comfort Cooling ...................................,........ 1
+ Power Cord Storage ........................................ 1
+ Sleeve Compatibility ........................................ 1
M FAULT CONDITIONS
e Fault Messages .................................,..,..,.. 24
ㆍ Watchdog Circuit .........................................1 4
M CONTRAINDICATIONS ...........................,............. 5
M CAUTIONS .............................,.,....,..........,.,. 5
E SERVICE AND MAINTENANCE
slntroduction............................. eee 6
e Warranty and Factory Service ............................... 6
+ Maintenance .........................................,.... 6-7
e Ventilation ................................................. 7
efFuses................................. eee 7
+ Electrical Safety ............................................ 7
e Cleaning .................................,............... 7
* Electrical/Electronics Description ........................... 7
e Pneumatic Description ...............................: Fer 8
e Portidentity ............................................ 8
» System Start-Up Routine .................................... 8
+ Pressure Monitoring ........................................ 8
(Continued on next page}

Operation & Service Manual
MODEL 6325
Table of Contents
(CONTINUED)
M CALIBRATION/TEST METHODS
.latroduction.............................. 1... eee 9
* Calibration Verification Procedure ........................... 9
.CalibrationProcedure..................................... 9-10
e General Function Test ...................................... 10
+ Procedure .....................,.......................... 10
Ш DISASSEMBLY/REASSEMBLY
»eCaseRemoval ............................................. 1
eCircuitBoardRemoval...................................... 1
+ Circuit Board Installation ................................... 1
+ Compressor..........................................,..... 1
+ Solenoid Valves ...................,...,.,.......,.......... 12
« Case Reassembly .......................................... 12
画 SPEEIFICATIONS ων νε νο ων κκ νε κκ 18
HE QUALITY SPECIFICATIONS .................................. 、.4
E FIGURE 1: Diagram of Bed Hook Use ........................... 15
@ FIGURE 2: System — View of Controls & Indicators ............. 16
@ FIGURE 3: Diagram of Power Cord Storage ..................... 7
M FIGURE 4: Pneumatics Schematic ............................. 18
E FIGURE 5: System — Exploded View ........................... 19
Ш FIGURE 6: Pneumatics & Electrical Circuits .................... 20
BB FIGURE 7: Electrical Schematic ............................... 2

General Operating Instructions
The SCD SEQUEL Compression System Model 6325 is designed to apply sequential gradient compression to the lower
limbs to prevent deep vein thrombosis in patients at risk.
M PRE-OPERATION CHECK
Before using the SCD SEQUEL Compression System on the
patient, verify that:
© The Tubing Set is properly connected to the System 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 Set.
© The left and right sides of the System are unobstructed
for free air flow.
© The System power cord is plugged into a grounded AC
receptacle of the correct voltage.
© No flammable anesthetic gases are present.
Ш USE OF BED HOOK
The SCD SEQUEL Compression System features a bed
hook.
This feature may be used by placing the System on
the footboard of the hospital bed with the System facing
away from the patient (see Figure 1).
NOTE: After placing the System on the footboard, confirm
that the System is securely held by the footboard, and does
not interfere with patient care.
E OPERATION
Turn the power switch on (located on the lower right side of
the System). The System performs a self-diagnosis and LED
check upon start-up. The LED segments illuminate, starting
at the top of the display panel. The System then begins
normal operation with ankle inflation. See Figure 2 for the
location of each control and indicator.
NOTE: When the System is turned on, the Sleeve Cooling
will be off. To activate Cooling, press the Cooling Button
while the machine is operating. The Cooling LED will
illuminate when the option is on.
In the case of a fault condition, the alarm will sound. The
appropriate fault code will be displayed and the System
will shut down.
M CYCLE MONITOR
The SCD SEQUEL Compression System has a Cycle
Monitor, which continuously displays the status of the
System’s compression sequence. The Monitor consists of
two back-lit panels which, when illuminated, read
INFLATE and VENT. These represent the two major divi-
sions of one complete cycle. During operation, the
INFLATE and VENT lights will illuminate to indicate which
part of the cycle the system is in. If the Sleeve Cooling is
off, the compressor will shut off during the Vent Cycle.
AUTOMATIC PRESSURE ADJUSTMENT
The SCD SEQUEL Compression System features micro-
processor controlled automatic pressure adjustment. This
feature automatically sets the pressure to 45mmHg and
maintains this set pressure even when the patient moves or
changes position.
After the start-up sequence, the System will set itself and
display 45mmHg. During the first few inflation cycles the
Controller will adjust itself to meet the 45mmHg. During
the initial setting period the decimal points on each side of
the 45 will display “.45.”
Within five cycles the System will stabilize between 43
and 47mmHg and the decimal points will turn off, leaving
“45”
displayed.
NOTE: Even after the initial 45mmHg pressure is reached,
the System will continue to make small adjustments in
order to maintain the 45mmHg.
MW POWER CORD STORAGE
Power cord storage for the SCD SEQUEL Compression
System is provided by wrapping the power cord around
the bed hook. This is shown in Figure 3.
E SLEEVE COMPATIBILITY
The SCD SEQUEL Compression System is designed for use
with SCD Sleeve Reorder #5330, 5329, 5480, 5345, and
5336.

Fault Conditions
Model 6325
Fault Messages ”
CODE FAULT TYPE
DESCRIPTION
SL System Low
There is less than 8mmHg pressure at the end of the first inflation cycle or at
the end of two consecutive cycles thereafter.
POTENTIAL CAUSES
* Tubing Set is not properly connected.
* There is a leak inside the System.
CORRECTIVE ACTIONS
© Ensure proper Tubing connections.
* Turn the System off and restart. If the System displays the same fault,
the unit requires servicing.
Lo
Low
The System is unable to bring the pressure up above 43mmHg for five consecu-
tive cycles. The pressure in the Sleeves is consistently below the set pressure.
POTENTIAL CAUSES
* Tubing is not properly connected.
* Sleeves are too loose.
CORRECTIVE ACTIONS
Ensure proper Tubing connections.
* Apply Sleeves so that only two fingers fit snugly between each Sleeve and
the patients leg.
* Turn the System off and restart. If the System displays the same fault,
the unit requires servicing.
SH
System High
Pressure has exceeded 90mmHg after 1.2 seconds of thigh cycle:
* On first cycle, System will switch to vent mode and adjust flow control
appropriately.
* On subsequent cycles, Systern will switch to the fault mode and
display this code.
(Continued on next page)
(1) When the microprocessor detects a fault condition, it interrupts the normal operation of the controller,
deactivates all valves, displays a fault code, and sounds an audible alarm. This alarm will remain
active until the System power switch is turned off.

Segue
Fault Conditions comwe
CODE FAULT TYPE DESCRIPTION
SH
System High
(continued)
POTENTIAL CAUSES
© Tubing Set is kinked.
© Sleeves are too tight.
CORRECTIVE ACTIONS
* Straighten out kinked Tubing Set.
+ Apply the Sleeves so that two fingers can fit snugly between each Sleeve and
the patients leg.
e Tum the System off and restart. If the System displays the same fault,
the unit requires servicing.
HI
High
The System is unable to bring the pressure down below 47mmH for five
consecutive cycles. The pressure in the Sleeves is consistently above the
set pressure.
POTENTIAL CAUSES
* Sleeves are too tight.
CORRECTIVE ACTIONS |
+ Apply the Sleeves so that two fingers can fit snugly between each Sleeve and
the patients leg.
* Turn the System off and restart. If the System displays the same fault,
the unit reguires servicing.
SP System Pressure
The System has not controlled to 35 - 55mmHg for 12 consecutive cycles.
POTENTIAL CAUSES
+ Sleeves are too tight.
CORRECTIVE ACTIONS
+ Apply the Sleeves so that two fingers can fit snugly between each Sleeve and
the patients leg.
e Turn the System off and restart. If the System displays the same fault,
the unit reguires servicing.
di internal
Diagnostic One
If the solenoid valve stays open, the microprocessor will detect this
condition, shut the System off, and display this code.
The System should be returned to the manufacturer for repair.

Model 6325
Fault Conditions commun
CODE FAULT TYPE DESCRIPTION
d2 Internal Upon start-up, the microprocessor performs diagnostic tests. If the System fails
Diagnostic Two to pass all of these tests, it will not start and this fault code will be displayed.
The System should be returned to the manufacturer for repair.
d3, d4 Internal These faults are indicated only during special test conditions and should not
Diagnostic Three, occur during normal operation.
Four
The System should be returned to the manufacturer for repair.
ds Internal This fault is indicated if the pump speed is not what is expected.
Diagnostic Five
The Compressor Outlet Filter should be replaced or the Muffler should be
cleaned. If fault reoccurs after replacement, the System should be returned to
the manufacturer for repair.
de internal This fault is detected if the pressure exceeds 25 mmHg after 54 seconds
Diagnostic Six of the vent cycle.
The System should be returned to the manufacturer for repair.
d7 - d9 Internal These codes have not been implemented.
Diagnostic Seven, They have been reserved for future use.
Eight, Nine
WATCHDOG
CIRCUIT
If the Microprocessor cannot continue normal function, the watchdog
circuit will trip. This causes the System 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 sound once every second.
If the cause of the disruption was transient, such as a high energy RF
pulse, the System will restart with the COOLING OFF.

SCD
9
の
Contraindications
The SCD SEQUEL 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
Severe arteriosclerosis or other ischemic vascular
disease.
Massive edema of legs or pulmonary edema from
congestive heart failure.
Extreme deformity of leg.
Suspected existing deep venous thrombosis.
Cautions
1.
2.
3.
WARNING: Do not attempt to repair or replace broken tubing connectors as hazardous inflation
When this device is used in the Operating Room, keep Comfort Cooling OFF to maintain air quiescence.
Federal (U.S.A.) law restricts this device to sale by or on the order of a physician.
Explosion Hazard. Do not use in the presence of flammable anesthetics.
of the sleeves may occur.
This product is a component of Kendall’s SCD System that is covered by various U.S. Patents. The
use of non-Kendall components in place of and/or in combination with this Kendall component may
constitute infringement of Kendall U.S. Patent(s). Kendall expressly states that no implied license with
respect to use of non-Kendall components is granted by the sale or lease of this component.
Other Patents Applied For

Service and Maintenance
Model 6325
M INTRODUCTION
The service technician should be familiar with the oper-
ator's portion of this manual and the operating principles of
the SCD SEQUEL Compression System. The fault codes dis-
played by the System are useful in diagnosing service prob-
lems. If a System is to be returned for service, a description
of the operating conditions and the fault code displayed
should accompany the unit.
This manual describes service procedures to the board
level, with an exploded view of the System shown in Figure
5. If a component failure on a circuit board is suspected, the
unit should be returned for service. It is recommended that
the instrument be returned with the circuit board in place,
as removal of the board(s) involves additional risk of
mechanical damage and damage from electrostatic dis-
charge (ESD).
E WARRANTY AND FACTORY SERVICE
The Kendall Healthcare Products Company warrants that
your SCD SEOUEL Compression System is free from defec-
tive material and workmanship. Our obligation under this
warranty is limited to the repair of Controllers returned to
the service address indicated at right, transportation charges
prepaid, within one year of delivery to the original pur-
chaser. Specifically, we agree to service and/or adjust any
Controller as reguired 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 Set or the individual disposable leg
Sleeves, or to eguipment damaged through shipping , tam-
pering, negligence, or misuse, including liquid immersion,
autoclaving, or ETO sterilization.
This limited warranty does not cover, and is intended to
exclude, any and alt liability on the part of the Company,
whether this limited warranty or any warranty implied by
law, for any indirect or consequential damages for breach
hereaf or thereof. Except as expressly provided above in the
limited warranty, the Company hereby negates and disclaims
all express and implied warranties, including the warranties
or merchantability and fitness for a particular purpose.
Some states do not allow the exclusion or limitation of inci-
dental or consequential damages, so the foregoing limita-
tion or exclusion regarding damages may not apply. Also,
this Limited Warranty gives you specific legal rights, and
you may also have other rights which may vary from state
to state.
This service manual is intended for use as a guide to
technically-qualified personnel when evaluating instrument
malfunctions. It is not to be construed as authorization to
perform warranty repairs. Unauthorized service will void the
warranty.
Controllers requiring warranty repairs must be shipped, pre-
paid and insured, to the Service Center. The Kendall Health-
care Products Company maintains service facilities with the
capability to promptly repair the SCD SEQUEL
Compression System. In the event of any service mainte-
nance problem, contact Customer Service. The toll-free
number is [phone]. If the instrument is to be
returned for service, please call the above number to obtain
an authorization return number and send it prepaid and
insured, in the original carton, to:
TYCO HEALTHCARE GROUP LP
98.6 Faichney Drive
Watertown, NY 13601
E MAINTENANCE
CAUTION:
Unplug the System before filter maintenance.
There are two filters used in the SCD SEOUEL Compression
System — a fan filter and a compressor outlet filter.
It is very important that the fan filter be cleaned frequently
to ensure continued trouble-free operation. The Controller
should never be run without the fan filter in place. To clean
the fan filter, gently pry the fan cover off the left side of the
System. Carefully remove the filter from the fan cover and
brush loose dust and lint from the surface. Wash the filter in
a mild detergent solution, dry thoroughly, and reinstall.
(Continued on page 7)

Service and Maintenance (60000
Mi MAINTENANCE (Continued)
Removal of the front cabinet exposes the compressor filter.
The filter is mounted below the compressor. The filter is
designed to exceed the life of the System. In the event the
filter becomes loaded, flow will become obstructed and the
System will repeatedly trigger a d5, LO, or SL alarm. When
this occurs replace the filter as follows:
Remove the inlet and outlet tube from the filter. Take the
filter off the Nylon hook pad, replace with a new filter, and
then reattach the tubing. Make sure the tube exiting the
compressor is connected to the inlet side of the filter.
Direction of flow is from the compressor to filter to valves
{see Figure 4), and is identified on the filter housing {avoid
kinking any tubing). Carefully replace front cabinet.
№ VENTILATION
Obstruction of the left fan cover and right vents should be
avoided. Free flow of air is necessary to prevent overheating
and premature component faiture.
圖 FUSES
CAUTION: Unplug the System before removing the fuse.
A blown fuse should only be replaced with a 3AG Slo Blo
fuse, 0.75 ampere.
If a fuse blows a second time, it should be presumed that
the instrument is defective and requires further service.
E ELECTRICAL SAFETY
CAUTION: Be sure the System is disconnecteď from the
power source before removing the front cover. A potential
SHOCK HAZARD exists when the front cover is removed
even with the unit turned off.
Periodic inspection should include a resistance check from
the power plug grounding prong to the metal chassis inside
the instrument. The chassis can be accessed by removing
the fan cover. 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 System should be returned to the
Service Center for testing and repair.
M CLEANING
The System cabinet can be cleaned as necessary with a soft
cloth dampened with water. If necessary, a mild disinfectant
and/or detergent can be used; excess fluid should be
avoided. The System should be wiped with a clean, dry
cloth afterward. Do not immerse in water.
The SCD SEQUEL Compression System cannot be effec-
tively sterilized by liquid immersion, autoclaving, or ETO
sterilization, as irreparable damage to the System will
occur.
MB ELECTRICAL/ELECTRONICS DESCRIPTION
The electronics of the controller are located on two PC
boards (see Figures 6 and 7). The first board can be found
beneath the membrane switch panel in the front case
cover. There is no high voltage on the PC boards. The CPU
board contains the LEDs and associated electronics which
display information about the state of the System during
normal operation, as well as in the fault mode or the var-
ious calibration and diagnostic modes. This board also
contains the pressure transducer, the microprocessor, the
buzzer, and the valve control.
The second board is the Power board. It contains voltage
regulation circuits, analog conditioning circuits, and motor
control circuitry.
Operator input is provided through the membrane switch
panel. Component or System failure will result in de-
energizing the valves and the compressor. This will release
pressure from the attached leg sleeves.

Model 6325
Service and Maintenance comue
Mi PNEUMATIC DESCRIPTION
The rotary vane compressor, driven by a low-noise brush-
less DC motor, runs only when needed. 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 compressor to turn on and the solenoid valve V to be
energized during the VENT phase (See Figure 4).
Air flow through the solenoid manifold assembly is con-
trolled by the motor control circuitry working with the
brushless DC motor. From the manifold assembly, the air is
gated to the sleeve chambers during the 11-second com-
pression phase by energizing solenoid valves A,C, and T in
sequence. 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
release sleeve pressure to the atmosphere. The ankle pres-
sure transducer monitors the pressure in the ankle portion
of the circuit and provides data input to the micro-
processor for feedback control (see Figure 6).
E PORT IDENTITY
The Tubing Set connecting the Sleeves to the System is
attached to the fitting on the rear of the System in the upper
left hand corner (as viewed from behind the System).
Inside this fitting are four ports which are, from left to
right: ANKLE, VENT (COOLING), CALF, and THIGH (see
Figure 4).
M SYSTEM START-UP ROUTINE
@ PHASE I:
When the System is turned on, a series of tests is com-
menced lasting three seconds'2):
1. All LEDs illuminate and the beeper sounds for
0.5 seconds.
2. The two seven-segment LEDs illuminate
(displaying “.88.") and then they go off.
3. The COOLING LED illuminates. The beeper
sounds briefly and the COOLING LED goes off.
4. The Cycle Monitor LEDs (INFLATE and VENT)
illuminate then go off.
+ PHASE Il:
The 45mmHg set pressure is displayed. During this
phase, the compressor flow is adjusted to a predeter-
mined start value.
® PHASE Ill:
The normal operating cycle begins with ankle inflation.
M PRESSURE MONITORING
The LED display that is used to display the 45 mmHg set
pressure and the fault codes can also be used to display the
actual pressure. Press the left end of the white horizontal
line of the contro! panel for two seconds. This will cause
the display to change to Pressure Monitor Mode. The
System will stay in this mode throughout the compression
and deflation portions of the current cycle (or the next
compression cycle if the button is pressed during the VENT
portion of the cycle). The last reading of the compression
portion of the cycle will be displayed for 30 seconds. At
the beginning of the next inflation cycle the display will
revert to displaying 45 mmHg pressure.
When the System is in the Pressure Monitor Mode, a
decimal point will flash on either side of the 7-segment
display, indicating that the actual pressure is being
displayed.
NOTE: While in the Pressure Monitor Mode, it is normal
for the displayed pressure to change rapidly during the
compression portion of the cycle.
(2) Detection of inoperative LEDs and the audible alarm function is the user's responsibility. The start-up routine also tests
microprocessor function and system memory. If a fault condition is detected, either a 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.

Calibration/Test Methods
See Disassembly/Reassembly procedure before testing.
M INTRODUCTION
The SCD SEQUEL Compression System has a special test
mode for pressure transducer Calibration Verification, pres-
sure transducer Calibration, and a general function test that
can verify microprocessor, solenoid valve, and pneumatic
functionality.
1, Factory calibration certification is void if the unit is
opened.
2. The unit should only be opened by persons trained in
Electrostatic Discharge prevention methods and
equipment.
@ CALIBRATION VERIFICATION PROCEDURE
Equipment Required: A regulated air source with a con-
stant output pressure set at 45.0 mmHg + 0.2 mmHg.
NOTE: The pressure transducers used in the SCD SEQUEL
Compression System are state-of-the-art, highly precise,
and virtually drift-free devices.
Complete the following steps to verify System Calibration:
1. Unplug the System.
2. Turn the System on its face and remove the five screws
located on the rear cabinet.
3. Carefully turn the System right side up so the front cab-
inet is facing you.
4. Gently lower the front cabinet toward you until the
components inside are accessible. (Make sure the var-
ious electrical and pneumatic connections between
the CPU Board and the rest of the unit are not dis-
lodged.)
5. Carefully disconnect the Tubing that is attached to the
Pressure Transducer on the Control Board.
6. Plug the System into a wall outlet.
CAUTION: ELECTRICAL SHOCK HAZARD.
Do not touch the electrical components on the chassis.
The PC Boards are not at line voltage.
7. Place the System in the Calibration Verification Mode
by first pressing the Hidden and Cooling Buttons
simultaneously while turning on the System. (The
Hidden Button is located on the control panel at the
very left end of the horizontal white line.) This places
the System in the Test Access Mode. The display will
show “01.” Press the Hidden Button until “04” appears
in the System display.
NOTE: Test Access Modes “01,” “02,” “05,” and “07”
require dedicated manufacturing test equipment and
are not intended for customer use. Do not use.
8. Press the Cooling Button to initiate the Calibration
Verification Mode. (The System will continuously dis-
play the pressure sensed at the pressure transducer.)
9. Connect the calibrated air pressure source to the
Pressure Transducer using a piece of Tubing.
10. Apply 45.0 + 0.2 mmHg. Read the pressure on the dis-
play.
11. Disconnect Tubing. With no pressure applied read the
display.
12. The display readings should be compared to the pres-
sure applied to verify proper calibration.
13. To exit Calibration Verification Mode, tum off the
System.
14. If the System requires calibration, proceed to the
Calibration Procedure step 7.
15. Unplug the Controller.
16. Reconnect the Tubing. Particular care should be taken
to avoid stressing or kinking the tubing.
17. Carefully replace the front cabinet and turn the
Controller on its face. Check for proper placement of
feet, foam, and tubing.
18. Refasten the five screws. (Do not over-tighten.)
@ CALIBRATION PROCEDURE
Equipment Required: A regulated air source with a con-
stant output pressure set at 45.0 mmHg + 0.2 mmHg.
NOTE: The pressure transducers used in the SCD SEQUEL
Compression System are state-of-the-art, highly precise,
and virtually drift-free devices. It is not expected to require
recalibration for several years or more of continuous use.
Complete the following steps to Calibrate the System:
1. Unplug the System.
2. Turn the System on its face and remove the five screws
located on the rear cabinet.
3. Carefully turn the System right side up so the front cab-
inet is facing you.
4. Gently rotate the front cabinet toward you until the
components inside are accessible. (Make sure the var-
ious electrical and pneumatic connections between
the CPU Board and the rest of the unit are not dis-
lodged.)
5. Carefully disconnect the Tubing that is attached to the
Pressure Transducer on the Control Board.
(Continued on page 10)

Calibration/Test Methods соли
Model 6325
Ἡ CALIBRATION PROCEDURE (Continued)
6.
11.
12.
13.
14.
15.
16.
17.
Plug the System into a wall outlet.
CAUTION: ELECTRICAL SHOCK HAZARD.
Do not touch the electrical components on the chassis.
The PC Boards are not at line voltage.
Place the System in the Calibration Mode by pressing
the Hidden and Cooling Buttons simultaneously while
turning on the System. (The Hidden Button is located
on the control panel at the very left end of the hori-
zontal white line.) This places the System in the Test
Access Mode. The display will show “01.” Press the
Hidden Button until “03” appears in the System display.
NOTE: Test Access Modes “01,” “02,” “05,” and “07”
require dedicated manufacturing test equipment and
are not intended for customer use. Do not use.
. Press the Cooling Button to initiate the Calibration
Mode. The System will now display the pressure in the
line.
. The INFLATE LED will be illuminated.
10.
Connect the calibrated air pressure source to the
Pressure Transducer using a piece of tubing.
With 45.0 + 0.2mmHg applied, press the Cooling
Button. (This will record the 45mmHg set point in
System software.)
The Vent LED will be illuminated.
Disconnect the tubing. With no pressure applied, press
the Cooling Button. (This will record the OmmHg set
point in System software.)
Turn the System off.
Reconnect the tubing. Particular care should be taken
to avoid stressing or kinking the tubing.
Carefully replace the front cabinet and turn the System
on its face. Check for proper placement of feet, foam,
and tubing.
Refasten the five screws. (Do not over-tighten.)
CAUTION: If the Cooling Button is pressed inadver-
tently during the Calibration other than when specified
in steps 8, 11, and 13, the System must be recalibrated.
IB GENERAL FUNCTION TEST
The following describes a General Function Test which can
be used to exercise the System. This test is not part of the
normal testing and maintenance routine, but can be used
in the event of disassembly to verify:
The correct wiring and connection of the solenoid
valves.
The correct orientation and connection of the pneu-
matic circuit.
There is no blockage or leaking in the pneumatic
circuit.
M PROCEDURE
1.
Press the Hidden and Cooling Buttons simultaneously
while turning on the System. (The Hidden Button is
located on the control panel at the very left end of the
white horizontal line.) This places the System in the Test
Access Mode. The display will show “01.”
Press the Hidden Button until “06” is on the System
display.
NOTE: Test Access Modes “01,” “02,” “05,” and “07”
reguire dedicated manufacturing test eguipment and
are not intended for customer use. Do not use.
During the procedure you will gently hold a finger near
each air outlet port on the back of the System to verify
air flow is present for each cycle at the correct port. The
order of the ports from left to right, looking at the back
of the System, is Ankle, Vent (Cooling), Calf, and Thigh
(see Figure 4). The flow will gradually increase for the
Ankle, Calf, and Thigh. The flow will start a maximum
and stop abruptly for the Vent.
To initiate the test, press the Cooling Button.
* The ankle solenoid valve will open, the System will
beep, and the compressor will run at minimum flow for
five seconds.
* The compressor will ramp up to maximum flow in
two seconds.
4 The System will beep and remain at full speed for
five seconds.
4 The ankle valve will close.
* The sequence will be repeated for the calf and thigh
portions.
9 At the end of the thigh portion, the thigh valve will
shut and the vent valve will open. The vent valve will
go immediately into maximum flow. This will last for
five seconds.
+ When the vent circuit has completed its cycle, the
System will return to the Test Access Mode.

Sige]
Disassembly /Reassembly
M 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 and
General Valve Function Tests be performed upon
reassembly. °
ESD WARNING: Unit should only be opened by person
trained in ESD methods and equipment.
Remove the case components in the following sequence:
(see Figures 5 and 6 located in the Appendix).
1. Remove front cover.
To remove the front cover, place the System on its face
and remove the five screws located on the back of the
unit.
2. With the System standing upright and facing you, care-
fully rotate the front cover toward you.
3. Note the location and orientation of the connectors
from the rear case components on the CPU Board.
Remove the connectors by gently pulling on each indi-
vidual connector. Some connectors have locking clips
that must be gently squeezed to disengage.
4. Very gently disconnect the Tubing at the pressure trans-
ducers on the CPU Board.
BE CIRCUIT BOARD REMOVAL
The CPU Board is located on the front case. The Power
Board is located on the rear case directly above the com-
pressor.
CAUTION: Use a grounded strap when handling any elec-
tronic components.
1. Note the location and orientation of all the pneumatic
and electrical connections to the PC Boards (see Figure
7). (Label cables and tubing if necessary.)
2. Disconnect all the pneumatic and electronic leads to
the PC Boards.
3. Remove the six mounting screws located on the CPU
Board.
4. Carefully slide the Power Board out of the System from
between the compressor and top of rear cabinet.
CAUTION: Components on the PC Boards should not be
removed or replaced. If a circuit board is suspected of
being faulty the unit should be returned for repair by
calling the toll-free service number [phone].
M CIRCUIT BOARD INSTALLATION
CAUTION: Use a grounded strap when handling any elec-
tronic components.
1. Carefully align the CPU Board with the mounting
bosses and fasten the six mounting screws.
2. Carefully slide the Power Board into the System
between the compressor and top of rear cabinet.
E COMPRESSOR
The Rotary Vane Compressor is driven by a state-of-the-art
brushless DC motor. Flow is controlled by adjusting the
rotational speed of the motor. The higher the speed, the
greater the flow. The motor control circuit which controls
the motor speed is located on the Power Board and is not
integral to the motor on the Compressor.
NOTE: The Compressor used in the instrument is not a user
serviceable component. Special jigs and fixtures are
required to ensure proper alignment during reassembly.
Do not disassemble.
Do not oil.

Disassembly/Reassembly como)
Model 6325
EE SOLENOID VALVES
+ All four solenoid valves are arranged in a 2-by-2 single
manifold.
The solenoid vaive that connects the pump to the
Sleeve Cooling (Vent) Port is a 2-way, normally closed
type. When energized, it passes air to the port; when
de-energized, flow is blocked.
The solenoid valve connecting air flow from the flow
control valve to the ANKLE, CALF, and THIGH ports 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 pres-
sure in the Sleeves is released through the port on the
top of that particular valve.
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 mal-
function 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. Filtration of incoming air guards against debris
entering the compressor. 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.
E UNIT REASSEMBLYG)
1. Place the rear case with the complete chassis installed,
on the bench in front of you with the front of the System
towards you.
2. Place the front case on its side with the bottom edge of
the front case against the rear base. The front case
should be toward you with the rear case behind.
@ Reconnect all of the electrical connections in the
proper location and orientation of the leads from
the System components. Replace the connectors by
gently pushing straight in.
@ Reconnect the Tubing on the pressure transducers.
Particular care should be taken to avoid stressing
the fittings on the pressure transducer.
3. Rotate the front case and place it over the rear case
base. Carefully align the two halves, making sure the
rubber feet are in place and aligned properly.
Turn the closed System on its face and reinstall the
five screws.
Turn the unit right side up and perform the General
Function Test.
(3) NOTE: It is recommended, before case reassembly, that any disassembly which involves
the electrical or pneumatic circuit requires a recalibration. (See Calibration Procedure.)

Sequel
Specifications
M MODEL #6325
UL Listing ....,........... Built to UL 544 Standard
Listing KFBQ File #E116754
Compression Type ....... Sequential, Gradient Pressure
Compression Cycle ......... 11 Seconds Compression,
60 Seconds Decompression
Set Pressure ....................,..... 45 mmHg
Bed Hook ................................. Yes
Power Cord Storage .................,....... Yes
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 inches
Controller Width ..................... 103/4 inches
Controller Depth ..................... 41/2 inches
Weight ...............................4 8.9 lbs.
Power Requirements ......... 115 VAC, 86 VA, 60 Hz
ShippinggUnit ............................. Each
Shipping Case Dimensions ....... Length - 13 3/8 inches
Width - 11 inches
Depth - 103/8 inches
Shipping Weight ........................ 12.2 lbs.
Tubing Set ............................ Included
Operating Instructions .............. Attached to unit
under handle
Operation & Service Manual .............. Included

Quality Specifications
Model 6325
M MODEL #6325
The following information is a brief description of the tests performed on all SCD SEQUEL Compression Systems to
ensure compliance to the prescribed System quality specifications and does not include clinical performance.
1.0
2.0
Electrical Tests
1.1 Power and Control Printed Wiring Board
Assemblies
The boards are tested on a board test fixture for the
following functions:
1.1.1. Individual component integrity
1.1.2 Component installation
1.1.3 Board calibration
1.2 Controller
1.2.1 Correct sequential activation of Inflate
and Vent LEDs
Cooling Button and LED function
Dielectric Voltage Withstand Test (Hi-Pot)
Power Switch function
Indicator lights and button functions
1.2.2
1.2.3
1.2.4
1.2.5
Pneumatic Functional Tests
2.1 Controller calibration at 45 + 2mmHg
2.2 Airflow supporting compression in the ankle,
calf, and thigh
System high pressure fault detection
System low pressure fault detection
2.3
2.4
3.0
4.0
5.0
Burn-In Requirements
While operating in the Burn-In Mode, the System
is run for 48 hours to enhance unit reliability.
Visual Attributes Inspection
4.1 Case parts appearance and alignment
4.2 Labeling
Final Product Inspection
Final release criteria utilizes 100% testing of
Systems for the following:
5.1 Calibration
5.2 Air flow levels
5.3 Cosmetic defects

Sequel 15
Figure 1
Diagram of Bed Hook Use

16)
Figure 2
Model 6325
System — View of Controls & Indicators
SET PRESSURE/
FAULT CODE
INDICATOR
INFLATE LED
ASSESS LED
HIDDEN BUTTON
COOLING LED
COOLING ON/OFF
BUTTON
POWER SWITCH