Welch Allyn Atlas User manual

Welch Allyn Medical Division
Patient Monitor
Operator Manual

WELCH ALLYN ATLAS PATIENT MONITOR i
SERVICE MANUAL 6200-43E REV. A
Drawings and/or illustrations and/or part numbers contained in this document
are for reference purposes only. For current revisions call the Welch Allyn
Customer Service phone number listed in Section 1 page 2.
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ii WELCH ALLYN ATLAS PATIENT MONITOR SERVICE MANUAL 6200-43E REV. A
Contents PAGE
Section 1: General Information
1.1 About the Atlas ............................................................................................................ 1
1.2 TechnicalHelpInformation,WorldwideTechSupport PhoneNumber........................... 2
1.3 Product Model Number Structure ................................................................................. 3
1.4 MainMenuArchitecture ................................................................................................ 6
1.5 Atlas System Block Diagram ........................................................................................ 7
Section 2: Service (See User Manual 6200-42E for Atlas Specifications)
2.1 IncomingInspection,Checklist ...................................................................................... 1
2.2 Repair Tests ............................................................................................................. 2-4
Table 2-1 :Tools Required for Service, Calibration and Software Loading ................... 5
Table 2-2:Software/Firmware Revision Levels ............................................................ 6
2.3 Calibration Procedures
BP Calibration - Section 2.3.1 ........................................................................... 7
ETCO2Calibration(623Modelsonly) - Section 2.3.2.........................................7&8
CO2Reset (623Modelsonly)- Section 2.3.3 ........................................................ 9
Printer Calibration -Section 2.3.4 ....................................................................... 10
Battery Voltage Calibration(Models 622xx and623xx only)-Section2.3.5 .... 10&11
TemperatureMeasurementSubsystemCalibration-Section2.3.6 ...................... 12
SetBatteryCharge Voltage-Section 2.3.7 .......................................................... 13
2.4 Software
SoftwareChart#2.4.1.......................................................................................... 14
DownloadingOperatingSystem2.4.................................................................... 15
2.5 DownloadingNVRAMTextfiles ............................................................................15&16
2.6 DownloadingSoftwareandNVRAMTextfiles............................................................. 16
2.7 Product Numbering Structure .................................................................................... 17
Section 3: Troubleshooting (Also see Atlas Operator’s manual Appendix E)
3.1 FunctionalTests/ Initial Diagnostic Steps ...................................................................... 1
3.2 TechnicalTroubleshootingTables:Complaint/Cause/CorrectiveAction ....................... 12
3.3 Top LevelTroubleshooting Index .................................................................................. 15
3.4 Diagnostic Tests and Test Setups ............................................................................... 17
Section 4: Disassembly and Repair
About Section 4 .................................................................................................................... 1
4.1 Model 200 Dissassembly .............................................................................................. 2
4.2 Model 200 Re-assembly.............................................................................................. 13
4.3 OtherModelsnotes ..................................................................................................... 15

WELCH ALLYN ATLAS PATIENT MONITOR iii
SERVICE MANUAL 6200-43E REV. A
Appendix Section:
A...............................................................................................................theory of operations
B...................................................................................................................... repair parts list
C....................................................................................interconnect diagram 620396 Rev A
D...................................................................... electricalschematics and circuit boardlayouts
E...........................SafetyTests:RequiredEquipmentandProceduresandTestResults Form

Section1-GeneralInformation
SERVICE MANUAL 6200-43E REV. A WELCH ALLYN ATLAS PATIENT MONITOR 1
1.1 About the Atlas Monitor
The Atlas combines in one unit all the necessary mea-
surements for patients under anesthesia, for surgical
recovery, or bed side monitoring. See Section 1.3 for a
complete listing of product models and options.
According to the standards of care for Nurse Anesthe-
tists and Anesthesiologists, all patients receiving con-
scious sedation are to be continuously monitored
throughout theprocedure and recovery phase by ECG,
SpO2, and NIBP. CO2 monitoring is a requirement dur-
ing gas anesthesia (when patient is ventilated).
The Atlas combines a CRT to display ECG and CO2
waveforms and LEDs for the other numeric values to
maximize visibility and viewing angle. Although not
designed to be a transport product, the monitor has an
integral handle and it is small and light enough at 13 lb
to be easily moved. A one hour battery enables the
monitor to be moved with the patient from the surgery
room to recovery room. It also maintains unit operation
for up to an hour when power is interrupted.
IMPORTANT: for a complete description on the func-
tion and use of the Atlas, as well as user safety warn-
ings, cautions, and warranty information, read and
understand the Atlas Operator’s Manual part number
6200-42E (English). Other languages are available.

Section1-GeneralInformation
SERVICE MANUAL 6200-43E REV . A
2 WELCH ALLYN ATLAS PATIENT MONITOR
1.2
Help Information Allserviceandrepairsmust beperformedbyfullytrained
and properly equipped personnel, using genuine
replacementpartsand correctprocedures. Failuretodo
sowillinvalidatetheproductwarranty.
Read and understand all safety warnings and
servicenotes printedinthisServiceManual andthe
Operator’s Manual part number 6200-42E. If in
doubt about any precaution or procedure, for
phone help, or to order additional copies of the
Atlas Operator’s Manual, contact:
Customer Service
WelchAllyn,Inc.
4341 State Street Road, PO Box 220
Skaneatles Falls, NY 13153-0220 U.S.A
Telephone [phone]
When calling, refer to the model number on the
bottomoftheAtlas. TheModelNumberisthefirstthree
digitsoftheSerialnumbernumber foundonthebottom
oftheAtlas.
Treat all returned opened Nasal CO2 Sample Lines
and watertraps as Bio Hazard material and dispose
of them in an approved manner.
Troubleshootingassistanceiscontained inSection3of
this manual to help determine which board is
malfunctioning.Thismanualdoesnotsupportrepairing
theprintedcircuitboards.
Year2000Information:TheAtlas isY2Kcompliantand
will notencounter “Year 2000”problems.
Safety Warnings

Section1-GeneralInformation
SERVICEMANUAL 6200-43E REV A WELCHALLYNATLASPATIENTMONITOR 3
1.3 Product Model Number Structure
621S0 ECG,NoninSpO2,NIBP
621SP ECG,NoninSpO2,NIBP,Printer
622S0 ECG,NoninSpO2,NIBP,Temp,Respiration,Battery, RS232
622SP ECG,NoninSpO2,NIBP,Temp,Respiration,Battery,RS232,Printer
622N0 ECG,NellcorSpO2, NIBP, Temp, Respiration, Battery,RS232
622NP ECG,NellcorSpO2, NIBP, Temp, Respiration,Battery, RS232, Printer
623SP ECG,NoninSpO2,NIBP, ETCO2,Temp,Respiration,Battery,RS232,Printer
623NP ECG,NellcorSpO2,NIBP, ETCO2, Temp, Respiration, Battery,RS232,Printer
SUFFIX:
Useletterdesignationforlanguagelocalizationasfollows:
E=English, F= French, G= German, I= Italian, S= Spanish, P= Portuguese C=Chinese,
J= Japanese
Usenumberdesignationforlinecordlocalizationasfollows:
1 = US, Canada, Japan Version
2 = European Version
4 = United Kingdom Version
6=Australian Version

Section1-GeneralInformation
4 WELCHALLYNATLAS PATIENTMONITOR SERVICEMANUAL6200-43EREVA
1.4 Main Menu Architecture
Alsonotethatthisisforthe623xxsystem.
•Ona 622xP system, deletethe CO2Reset box, theCalibrate CO2item,andthe CO2
units item.
•Ona 621xP system, deletethe CO2Reset box,the Calibrate CO2item, the CO2
units item, Respiration speed item, the Temperature units item, and the Battery
test item.
•Onsystemswithoutprinters(621x0and622x0)delete thePrinter test pattern item.
*
*TheDisplayA/DChannelsalso lets you press <SET> up and downtodisplayadditional
setsofinformation,butdoesnotchangethemenupagethatyouareon, just writes
differentinformationontherightsideofthescreen.

Section1-GeneralInformation
SERVICEMANUAL 6200-43E REV A WELCHALLYNATLASPATIENTMONITOR 5
Section 1.5 Atlas System Block Diagram

Section 2 - Service
SERVICEMANUAL6200-43EREV. A WELCHALLYNATLASMONITOR 1
2.1 Incoming Inspection
o2.1.1 Inspect shipping package and product
for damage. Make a record of possible
shipping damage.
2.1.2 List accessories in box.
opower cord
oSpO2probe
oECG leads
oECG lead cable
oCuff(s)
oOperator Manual
onasal C02Line
oECG Electrode(s)
otemperature probe
oBP tubing
opaper
oloose parts, describe
o2.1.3 Clean and disinfect by following the
instructions printed in the Operator
Manual.
o2.1.4 Operate the Atlas to verify the customer
complaint before making any changes to
the unit. Call the customer if the complaint
is unclear.
NOTE: Perform REPAIR TESTS in
Section 2.2 to fully inspect the
Atlas monitor before and after
servicing. Refer to Section 3
for Troubleshooting help.
2.1.5 If the unit has caused or is suspected of
having caused an injury of any type:
DO NOT DISASSEMBLE OR REPAIR
THEUNITINANYWAY.
Contact Welch Allyn Customer Service
immediately.
Service Intervals for
Calibration and Main-
tenance are listed in
Atlas Operator’s
Manual Appendix C.

Section 2 - Service
2 WELCH ALLYN ATLAS MONITOR SERVICE MANUAL 6200-43E REV. A
2.2 Repair Tests 2.2.1 Blood Pressure System Leakage Test:
Unit must not leak more than 5 mmHg in a 15
second interval while attached to a 100 cc
volume at test pressures of 50mmHg and
250mmHg.
Need:
100cc (+10/-0cc) test cavity
stopwatch
squeeze bulb
2.2.1.1 Connect Atlas to test 100cc volume and
Setra Gage as shown in Figure 2.3.1.1
2.2.1.2 Turn Atlas ON
2.2.1.3 PressTime and Date button to access
OptionsMenu.
2.2.1.4Press Lead Selectbuttonto select
ServiceMode.SelectVerify Manometer
2.2.1.5Pressurize the Atlas withsqueezebulb
to50mmHg.
NOTE: Allow reading to stabilize for 15 seconds.
2.2.1.6Observe pressure for 15additional
seconds.Unitshouldnotleak more than
5mmHgduringthistime.
2.2.1.7Performthisprocessat 250mmHg
2.2.2 Dump Test:
Unit must be able to deflate a 500 cc volume
from greater than 260.0 mmHg to less than
15.0 mmHg in 10 seconds or less.
2.2.3 Manometer Accuracy Test
Internal temperature of the unit must be less
than 32.0 degrees Celsius before performing
test.
2.2.3.1 The primary transducer must be within +/-
0.75 mmHg at 0 +/-0.3 mmHg. The safety
transducer must be within +/-1 mmHg at
0+/-0.3 mmHg.
2.2.3.2 The primary transducer must be within +/-
1.5 mmHg at 50 +/-5.0 mmHg. The safety
transducer must be within +/-1.5 mmHg at
50 +/- 5.0 mmHg.
2.2.3.3 The primary transducer must be within +/-
1.5 mmHg at 150 +/-5.0 mmHg. The
safety transducer must be within +/-4.5
mmHg at 150 +/- 5.0 mmHg.
2.2.3.4 The primary transducer must be within +/-
Manometer Accuracy Test
BP Dump Test
BP Leak Test

Section 2 - Service
SERVICEMANUAL6200-43EREV. A WELCHALLYNATLASMONITOR 3
2.2.4 Deflation Test:
With the unit connected to a large adult cuff
and a target inflation pressure of 200 mmHg*
have the unit perform a complete “normal”
BP cycle.
For steps two and three, the size of the step
must be between 3.0 mmHg and 11.0 mmHg.
Step 4 and all other steps above or equal to
40 mmHg, step size must be between 7.0
mmHgand 11.0 mmHg. All steps below 40
mmHg, except for the last step, will be
between 4.5 mmHg and 10 mmHg. The last
step will be between 0.01 mmHg and 10
mmHg.
2.2.5 Charge Voltage Test:
Check battery charging circuit:
Specification :No Load: 6.85VDC across
right pin (+) and left pin (-) of Main PCB
battery charge connector.
2.2.6 Hardware Fail Safe Tests
2.2.6.1 Over Pressure Test:
Atlas hardware must detect over
pressure on unit pneumatic system
between 296.0 mmHg and 329.0 mmHg.
2.2.6.2 Over 15 mmHg Test:
Atlas hardware must detect if the
pneumatic system has been pressurized
greater than 15 mmHg for more than 155
seconds but less than 180 seconds.
2.2.6.3 Under 15 mmHg Test:
Atlas hardware must detect if the
pneumatic system has been pressurized
less than 15 mmHg for more than 25.0
seconds but less than 35.0 seconds
before alowing new inflation cycle in “non-
Stat” Auto Mode.
2.2.7 RS232 Test:
The RS232 communication operation
will be confirmed with successful
serial transmit and receive.
2.2.8 Printer Option Test:
The printer must be able to print out the test
pattern . Inspect print quality.
RS232 Test
Printer Option Test
Deflation Test
Charge Voltage Test
Hardware Fail Safe Tests
* Go to service mode
screen and set initial
pressure to 200mmHg.

Section 2 - Service
4 WELCH ALLYN ATLAS MONITOR SERVICE MANUAL 6200-43E REV. A
ECG Test
SpO2Test
2.2.9 ECGTest:
Use a calibrated simulator to check
performance.
NOTE:Thereis no calibration for the ECG or
impedance Respirationsubsystems.
If theperformancedoesnotmatchuptothat
expectedusingacalibratedsimulatorthen
therecouldbea problem with the cable, leads,
connectors,wiringorthemainboarditself. If
themainboardisfaultythenreplace it.
2.2.10SpO2Tests:
Need:
Appropriate Phantom finger set
SpO2cuff and cable
Or:
Nellcor or Nonin (as fitted) simulator
(replaces cuff to drive subsystem)
Or:
Calibrated SpO2simulator that has a cuff
fitting that simulates a perfused finger
Nonin: Settings for NoninPatient Simulator
8000S are 98% O2/ 80 BPM. SpO2 board
accuracy after 25 second stabilization period
must be within +/-2%O2and +/- 2BPM.
Nellcor: Settings for Nellcor Patient Simulator
SRC-2 are 81% O2and 112 BPM. SpO2board
accuracy after 25 second stabilization period
must be within +/-2% O2 and +/- 2 BPM.
2.2.11TEMP ACCURACY VERIFICATION
Need:
Calibrated thermometer (DIGITAL OR GLASS)
small insulated container with cover for warm water
2.2.11.1Fill container wtih approximately 96 degree
F water
2.2.11.2Attach temperature probe neaqr the sensing
part of the thermometer and insert into the
warm water.
2.2.11.3Accuracy must be within +/- 0.2 degrees F.
Temperature Test
NOTE:There is no
calibration for the SpO2and
Pulse subsystem. If the
performance does not
match up to that expected
using a calibrated simulator,
or the Phantom finger set,
then the subsystem board
must be replaced.
NOTE:
Section 3 of this Service
Manual contains
troubleshooting steps for
the ECG subsystem.
These tests will help
determine if the main
board is faulty.

6 WELCH ALLYN ATLAS MONITOR SERVICE MANUAL 6200-43E REV. A
Section 2 - Service
LEDOMmetsySgnitarepOredaoltooBroclleNninoNnoyrP
OS12699/8/9,0004.10.AA99/02/6,0000.10.AA7V
PS12699/8/9,0004.10.AA99/02/6,0000.10.AA7V
OS22699/8/9,0004.10.AA99/02/6,0000.10.AA7V
PS22699/8/9,0004.10.AA99/02/6,0000.10.AA7V
ON22699/8/9,0004.10.AA99/02/6,0000.10.AA79/71/210.0.2.1V
PN22699/8/9,0004.10.AA99/02/6,0000.10.AA79/71/210.0.2.1V
PS32699/8/9,0004.10.AA99/02/6,0000.10.AA7V00.1VE.0
PN32699/8/9,0004.10.AA99/02/6,0000.10.AA79/71/210.0.2.1V00.1VE.0
Table2-2:Software/Firmwarerevisionlevels

Section 2 - Service
SERVICEMANUAL6200-43EREV. A WELCHALLYNATLASMONITOR 7
2.3.1 BP Calibration :
Need: 500cc vessel (approximate)
calibrated digital manometer
squeeze bulb with one-way valve
tubing and T fittings
PC with HyperTerminal *
serial cable
2.3.1.1 Connect:manometer, bulb,and500ccvessel
toBPportwith“T”connectors,AtlastoPC
withserialcable.
2.3.1.2 TurnAtlasONandstartHyperTerminalonPC.
2.3.1.3 Entercommands onSerialinterface:
Pangea> bp valve close<ENTER>
Pangea> bp safety off<ENTER>
2.3.1.4 Entercommand:
Pangea> bp cal 5000
Do not press <ENTER> yet!
2.3.1.5 Raisepressure with bulb to as close to
50.00mmHg aspossibleorslightly higher. Let
thepressurebleeddowntoexactly
50.00mmHg. Nowpress<ENTER>.Takeno
morethan3minutesforthisstep.
2.3.1.6 Entercommand:
Pangea> bp cal 25000<ENTER>
2.3.1.7 Repeatstep2.3.1.5 with 250.00 as target.
Press<ENTER>when pressuredeterioratesto
250.00mmHG.
2.3.1.8 Entercommand:
Pangea> nvram write<ENTER>
2.3.1.9 Disconnectserialcableandinstrumentsand
cyclepoweron Atlas. BP cal complete.
2.3.1.10Verifyaccuracyofpressuresettings
byrepeatingstep2.3.1.3then2.3.1.5and
compareAtlasfrontpanelreadingwithSetra
readout. Do this at 50.00mm and 250 mm Hg.
2.3.2 ET CO2 Calibration: 623 Models only
Need: Tankofapproximately10%CO2,balanceN2
(certified)BloodGasMixture
TubingandTconnectors
Watertrap andscrubber
2.3.2.1 Insertwatertrap.Power up.
2.3.2.2 PlacetheinstrumentintoService Mode: Press
Date/TimeLeadSelectbutton.
2.3.2.3 Select Calibrate CO2
Message “Remove CO2water trap” will
appear.
2.3 Calibration
2.3.1 BP Calibration
Caution: Improper use, stor-
age, handlingofcompressed
gas vessels can cause injury
or death! Follow gas manu-
facturerssafetyprocesses.
Setra
500cc volume
Figure 2.3.1.1
2.3.2 ET CO2 Calibration
*Access and set up
HyperTerminal:
1-Start
2-Settings
3-Control Panel
4-Add/Remove Programs
5-Windows Setup
6-Communications
7-selectHyperTerminal
8-APPLY
Settings are:
9600 Baud, 8 bit word, 1 stop bit
noparity, no flowcontrol
ANSIcharacterset
FindHyperTerminal in Programs,
Accessories
NOTE: The Scrubber looks
similar to a watertrap, but
is filled with white granules.
It is included with model
623XX.
NOTE:Replace water trap
every 6 hrs of use. Treat
water trap and used
NasalCO2 Sample lines
as bio hazard material!

Section 2 - Service
8 WELCH ALLYN ATLAS MONITOR SERVICE MANUAL 6200-43E REV. A
2.3.2.4 Remove water trap from water trapsocket.
2.3.2.5 Message “Install scrubber” will appear .
2.3.2.6 Attach scrubber to water trap.
2.3.2.7 Insertscrubber/watertrapassembly into water
trapsocket.
Message “Enter span gas value using
<Set> button” will appear.
2.3.2.8 Changethedefaultvalue(10%) to thevalueof
span gas being used (calibrated 8% to 12%
concentrationknownto ±0.01%).
2.3.2.9 Press <BP Start/Cancel>
Message: “Sampling”appearswhile the
instrumentissamplingthescrubberair.
2.3.2.10Wheninstructed,removethe scrubber from
theCO2watertrap.Donotremovewatertrap.
2.3.2.11 Attach the calibrated source of CO2gas
to the CO2side-stream sampling tube as per
Figure2.3.2.11
2.3.2.12Adjust theCO2 regulator justenoughto
allowasmallamountofgastoflowoutofthe
vent(approximately3 PSI).
Important: Once positive flow is
established, let the it flow for one minute
before pressing the Continue button and
actually sampling.
After one minute, press the Continue
button to let the Atlas start sampling CO2. .
2.3.2.13 Press<BPStart/Cancel>
Message: “CO2calibration successful” or
“CO2 calibration failed” will appearon
the CRTdisplay.
(Note: SerialCommunicationis not the cause ofafailure
if the Prion Serial appears in the Service Screen.
Thereforetheproblemiswiththeboardorconnections
andnotserialcommunicationproblems.)
2.3.2.14PressTrend buttontoExit.
To calibrate the CO2system in years 2022 or later it is
necessarytoresetthesystemclocktoanearlieryear,
performthecalibration,andthensettheclocktothe
correctyearagain. Theservice center should keep a
record of this since the Cal display in the Service Mode
screenwillbeincorrect.
CO2
watertrap
vent
Figure 2.3.2.11
Note: Adjust regulator to
approximately2PSI.
valve
NOTE:Replace water trap
every 6 hrs of use. Treat
water trap and used
NasalCO2 Sample lines
as bio hazard material!
SR856: CO2Calibration
beyond the year 2021

Section 2 - Service
SERVICEMANUAL6200-43EREV. A WELCHALLYNATLASMONITOR 9
NOTE: There may be a
message indicating a 5
minute Warming Up period.
2.3.3 CO2 RESET
Need: Watertrap and Scrubber
2.3.3.1 Press the Date/Time button on the lower
right of the monitor. The Set Date and Time
and Other Options menu will be displayed.
2.3.3.2 Select the Reset CO2selection by pressing
the CO2/RESP ALARMS Off button.
CO2Reset screen will appear.
2.3.3.3 Follow the instructions on the screen.
“Remove the CO2watertrap”.
“Install the CO2Scrubber onto theCO2
watertrap.”
NOTE: The Scrubber looks similar to a watertrap,
but is filled with white granules. It is included
with model 623XX.
2.3.3.4 Remove the tubing from the watertrap and
attach the Scrubber to the watertrap.
2.3.3.5 Insert the watertrap/Scrubber combination
into the watertrap socket.
2.3.3.6 Messages: The system will report that it is
Sampling. The system will then report Reset
Complete.
2.3.3.7 Removethewatertrap/Scrubberfrom the
watertrapsocket.
2.3.3.8 DetachtheScrubberfromthewatertrapand
reattachthetubing.
2.3.3.9 Replacethewatertrapinthewatertrapsocket.
2.3.3.10PressTrend to returntothe waveform
screen.
2.3.3 CO2 RESET

Section 2 - Service
10 WELCH ALLYN ATLAS MONITOR SERVICE MANUAL 6200-43E REV. A
2.3.4 PRINTERCALIBRATION
Need:
PC with HyperTerminal
Serial cable
Connector
2.3.4.1 Use HyperTerminal to get strobe width
settings for printer normal for waveforms -
text for trend
Advanced configuration printing:
Pangea> nvram get
printer_strobe_width_normal<ENT>
(normal value 130)
Pangea> nvram get printer_strobe_width_text<ENT>
(normal value 70)
2.3.4.2 Change values - larger number for darker
printing. Change with:
Pangea> nvram set printer_strobe_width_normal XXX
Pangea> nvram set printer_strobe_width_text YYY
2.3.4.3 Test and reset until satisfied.
2.3.4.4 PressTrendbuttontoexittheServiceMode.
2.3.5 BATTERYVOLTAGECALIBRATIONformodels
622XX and 623XX.
NOTE: CHECKBATTERYVOLTAGE CALIBRATION
AFTERREPLACINGMAINPCB.
Need:
DC power supply rated: 7 VDC at 5A
Batteryeliminatorcable-Atlasbatteryplugonone
end,interfacetothepowersupply on the other.
Thereshouldbeaccessforvoltmeter probes at
theAtlasendof the cable when it is installed
DMM / DVM with 10mV resolution on a 10V scale
PCwithHyperTerminal
Serialcableandconnector
2.3.5.1. Connect serial cable to PC and Atlas
2.3.5.2 RemovebatteryfromAtlas
2.3.5.3 Setthepower supply to 6.8V+/-200mV
2.3.5.4 Connectthepowersupplytothe Atlas battery
connector.
2.3.5.5 Turn AtlasON.
2.3.5.6 Reducethepowersupplyto6.0V
2.3.5 BATTERY VOLTAGE
CALIBRATION
2.3.4
PRINTER CALIBRATION
Note: Two lines are displayed:
Waveform +128, Text +70
These two numbers are factory
defaultsandagoodstarting point
if the system is printing very
poorly or not at all.
TheLEFT<SET>button controls
the Waveform setting, up and
down. The RIGHT <SET> but-
ton controls the Text setting, up
and down. Make changes tothe
settings as needed, where a
larger number = darker printing
and a smaller number = lighter
printing. Make initial changes of
about 10 points each time. After
making an adjustment, press
<TREND> to exit the Service
Mode.

Section 2 - Service
SERVICEMANUAL6200-43EREV. A WELCHALLYNATLASMONITOR 11
2.3.5.7 Measurethevoltageatthe battery connector
(attheAtlas)to the nearest 10mV.
NOTE: Donotmeasureatthepower supply,since
cableresistancewillintroduceerror.
2.3.5.8 AttheHyperTerminal,type:
Pangea>power cal XXXX<ENTER>
(where XXXX represents the measured voltage in
millivolts no decimal point.) For example, if you
measured 6.010V at the battery connector, use the
command “power cal 6010<ENTER>”.
2.3.5.8 TheAtlaswillrespond:
raw=ZZZZ mV true = 6010mVOK
(where ZZZZ is the raw uncalibrated reading that the
instrument made.)
2.3.5.9Reducethepowersupplyto 5.6 volts. You
shouldsoonhearthe “low battery”alarm.
2.3.5.10Measure the voltageatthebatteryconnector
tothenearest10mV.
2.3.5.11At theHyperTerminal,type:
Pangea>power cal XXXX<ENTER>
(where XXXX represents the measured voltage in
millivolts no decimal point.) For example, if you
measured 5.590V at the battery connector, use the
command “power cal 5590<ENTER>”.
2.3.5.12 TheAtlaswillrespond:
raw=ZZZZ mV true = 5590mVOK
(where ZZZZ is the raw uncalibrated reading that the
instrument made.)
2.3.5.13 Finish by typing: (this will re-boot ATLAS)
Pangea> hw reset<ENTER>
2.3.5.14 TurnAtlasOFFandremovethepower
supply.
2.3.5.15 Re-Installthebattery.