GE DPX-NT Service Manual

Document Information for:

LU44246ADW

Type
Name
Revision
State

Drawing Print
LU44246ADW

3
Release

ECO 2086536

Description
Originator

DPX-NT,MD Service Manual
212027348_jennifer_lynn_pakter

File List

1. LU44246ADW_s1_r3.pdf

Approval Information
Person Action Date and Time

212018997_connie_c_hottman Approved 05/20/2010 2:26:30 PM GMT
212027348_jennifer_lynn_pakter Approved 05/11/2010 7:39:55 PM GMT

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GE Healthcare

DPX-NT and MD+ Service Manual

Date: Mar 2010

Part No.: LU44246

Revision 3

ECO 2086536

Headquarters

GE Medical Systems Lunar
3030 Ohmeda Drive
Madison, WI 53718-6704
USA
[phone]

Europe

GE Medical Systems IT GmbH
Munzinger Strasse 3-5
D-79111 Freiburg
Germany
[phone]
[phone] (Fax)

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© 2009 by GE Healthcare

Asia/Pacific

4-7-127 Asahigaoka
Hino-shi, Tokyo 191-8503
Japan
[phone]
[phone] (Fax)

Germany

Beethoven Str. 239
D-42655 Solingen
Germany
[phone]
[phone] (Fax)

www.gehealthcare.com

China

No. 19 Changjiang Road
Wuxi, Jiangsu, 214028
P.R.C.
[phone]
[phone] (Fax)

France

GE Healthcare Lunar
11 Avenue Morane
Saulnier
78457 Velizy
France
[phone]
[phone] (Fax)

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DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

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Revision History

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 3 of 141

Revision Date Author Description

3 Mar 2010 Jennifer Pakter 1. Updated English Only Disclaimer (added

languages since last revision).

2. Added detailed test work instructions to
Section 5.6.

3. Removed test grid and referenced
LUSE0002 in its place.

2 Dec 2010 Jennifer Pakter 4. Updated English Only Disclaimer (added

languages since last revision).

5. Updated Sections 1.0 and Chapter 5 to
comply with MD.

6. Added NT/MD+ revision information to
Section 2.0

7. Added OMD information to Section 2.4.1

8. Removed system labels

9. Updated Appendix

1 Jun 2009 Jennifer Pakter 1. Updated contact information on cover due

to facility moves

2. Added English Only disclaimer in multiple
languages

3. Updated labels

4. Added appendix that lists associated
service documentation.

Previous revisions were under part number
LU8392 last revision C approved on CO L6631
in Oracle Engineering. Revision History was
not recorded in document until Rev. 1.

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DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

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This document contains confidential or proprietary information of GE Healthcare.

䄺

ᤞܫ

ᤞܫ

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 5 of 141

Neither the document nor the information is to be reproduced, distributed, used
or disclosed, either in whole or in part, except as specifically authorized by GE
Healthcare.

GE Healthcare makes no warranty of any kind with regard to this material, and
shall not be held liable for errors contained herein or for incidental or
consequential damages in connection with the furnishings or use of this manual.

Read through this manual thoroughly before attempting to service any
components. Unauthorized service may void system warranties or service
contracts. Consult the GE Healthcare Customer Support Department prior to
attempting any servicing.

WARNING

(EN)

ɉɊȿȾɍɉɊȿɀȾȿɇɂȿ

(BG)

(ZH-CN)

(ZH-HK)

(ZH-TW)

This service manual is available in English only.
x If a customer's service provider requires a language other than english, it is the

customer's responsibility to provide translation services.

x Do not attempt to service the equipment unless this service manual has been

consulted and is understood.

x Failure to heed this warning may result in injury to the service provider, operator

or patient from electric shock, mechanical or other hazards.

Ɍɨɜɚ ɭɩɴɬɜɚɧɟ ɡɚ ɪɚɛɨɬɚ ɟ ɧɚɥɢɱɧɨ ɫɚɦɨ ɧɚ ɚɧɝɥɢɣɫɤɢ ɟɡɢɤ.

x Ⱥɤɨ ɞɨɫɬɚɜɱɢɤɴɬ ɧɚ ɭɫɥɭɝɚɬɚ ɧɚ ɤɥɢɟɧɬɚ ɢɡɢɫɤɚ ɞɪɭɝ ɟɡɢɤ, ɡɚɞɴɥɠɟɧɢɟ ɧɚ

ɤɥɢɟɧɬɚ ɟ ɞɚ ɨɫɢɝɭɪɢ ɩɪɟɜɨɞ.

x ɇɟ ɢɡɩɨɥɡɜɚɣɬɟ ɨɛɨɪɭɞɜɚɧɟɬɨ, ɩɪɟɞɢ ɞɚ ɫɬɟ ɫɟ ɤɨɧɫɭɥɬɢɪɚɥɢ ɢ ɪɚɡɛɪɚɥɢ

ɭɩɴɬɜɚɧɟɬɨ ɡɚ ɪɚɛɨɬɚ.

x ɇɟɫɩɚɡɜɚɧɟɬɨ ɧɚ ɬɨɜɚ ɩɪɟɞɭɩɪɟɠɞɟɧɢɟ ɦɨɠɟ ɞɚ ɞɨɜɟɞɟ ɞɨ ɧɚɪɚɧɹɜɚɧɟ ɧɚ

ɞɨɫɬɚɜɱɢɤɚ ɧɚ ɭɫɥɭɝɚɬɚ, ɨɩɟɪɚɬɨɪɚ ɢɥɢ ɩɚɰɢɟɧɬa ɜ ɪɟɡɭɥɬɚɬ ɧɚ ɬɨɤɨɜ ɭɞɚɪ,
ɦɟɯɚɧɢɱɧɚ ɢɥɢ ɞɪɭɝɚ ɨɩɚɫɧɨɫɬ.

ᴀ㓈ׂ᠟ݠҙᦤկ㣅᭛⠜ᴀDŽ

x བᵰᅶ᠋ⱘ㓈ׂ᳡ࡵҎ䳔㽕䴲㣅᭛⠜ᴀˈ߭ᅶ᠋䳔㞾㸠ᦤկ㗏䆥᳡ࡵDŽ
x ᳾䆺㒚䯙䇏ᅠܼ⧚㾷ᴀ㓈ׂ᠟ݠПࠡˈϡᕫ䖯㸠㓈ׂDŽ
x ᗑ⬹ᴀ䄺ৃ㛑ᇍ㓈ׂ᳡ࡵҎǃ᪡԰Ҏ៪ᙷ㗙䗴៤⬉ߏǃᴎẄӸᆇ៪݊Ҫᔶ

ᓣⱘӸᆇDŽ

ءࣚ೭֫םႛ༼ࠎ૎֮ءΖ

x ଣૉড়֪ࣚ೭ࠎᚨ೸Ꮑ૞૎֮א؆հࣚ೭֫םΔড়֪ڶຂٚ༼ࠎ៬᤟ࣚ೭Ζ
x ೈբ೶ᔹءࣚ೭֫ם֗ࣔػࠡփ୲Δܡঞ֊֎ቫᇢፂଥ๻ໂΖ
x լᙅൕءᤞܫࢨᄎחࣚ೭ࠎᚨ೸Εጻ࿮ࠎᚨ೸ࢨఐԳ࠹ࠩᤛሽΕᖲඳࢤࢨࠡה

ٲᙠΖ

ءፂଥ֫םႛڶ૎֮Ζ

x ૉড়֪ፂଥᐗ೸Ꮑ૞૎֮א؆፿ߢΔᚨطড়֪۞۩༼ࠎ៬᤟ࣚ೭Ζ
x ᓮ֎ᇢቹፂଥء๻ໂΔೈ ൞բᔹࠀᛵᇞءፂଥ֫םΖ
x ૉآఎრءᤞܫΔױ౨ᖄીፂଥᐗ೸Εᖙ܂୉ࢨఐ൛ڂᤛሽΕᖲඳࢨࠡהٲᙠۖ

࠹႞Ζ

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READ THIS FIRST

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 11 of 141

Using This Manual

A person who will be performing service work on the DPX-NT / MD+ should use this
manual in the following manner:

Read the Safety and Overview Chapters to familiarize yourself with the scanner
as a whole and with the genera lfunction of the circuit boards.

Chapter 3 should be understood completely as it explains the Diagnostics
Software (built in – requires a password for access).

The Chapter 4 and Chapter 5 contain common procedures and troubleshooting
information and can be read as needed, but are good sources of information.

When a problem arises, Chapter 4 should be referenced. Check the table of
contents for Chapter 4 to see if the problem being experienced is described. If
so, refer to the appropriate page. If not, try to generalize the problem (e.g. the
Detector is repeatedly running into the front of the scanner and reversing and
then running back into the front of the scanner. This is a mechanical problem in
general, specifically with Transverse Mechanics, check that subsection of
Chapter 4 for the subsystem experiencing the fault.

This manual commonly references other Sections and pages of the manual as
needed, so often procedures in the Chapter 5 and the Appendix are referred to
as ways to solve problems described in Chapter 4.

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DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

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Table of Contents

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 13 of 141

Chapter 1: Safety 15

1.0 General Safety 17

1.1 Symbols and labels found on the DPX-NT / MD+ 18

1.2 Emergency Stop Button 22

1.3 Laser Exposure 23

1.4 Shutter Indicator 24

1.5 Cautions, Warnings, and Notes 24

1.6 Safety Concerns 25

1.7 Scatter Radiation 26

1.8 Controlling Computer and Accessories 29

1.9 Peripheral configurations 29

Chapter 2: System Overview 33

2.0 DPX-NT / MD+ System 37

2.1 Electronics 38

2.2 DPX-NT / MD+ Block Diagrams 40

2.3 DPX-NT / MD+ Fusing 43

2.4 Combined Single Board Controller cSBC 43

2.5 X-ray Source 61

2.6 Display Panel 62

2.7 High Voltage Power Supplies 63

2.8 D-MAX Board (DPX-NT (A) ONLY) 63

2.9 XORB Board (DPX-NT (A) ONLY) 63

2.10 Detector Sub System 64

2.11 X-Ray Collimator Subsystem 64

2.12 DPX-NT / MD+ Specifications 65

2.13 Secondary Calibration / Daily QA 76

Chapter 3: Service Software 81

3.0 Diagnostic Software 83

3.1 The Tools Menu 84

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3.2 Tools / Diagnostics Menu 85

Page 14 of 141

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

3.3 Diagnostic Scan Modes 88

3.4 Error Log 88

3.5 Service Options 93

Chapter 4: Troubleshooting 95

4.0 Diagnostic Failure Codes 97

4.1 Transverse Motion failure 97

4.2 Longitudinal Motion failure 100

4.3 Failure of the DC Power Supply 104

4.4 Emergency Stop Button 104

4.5 Tube Head Thermostat 105

4.6 Communication Error 105

4.7 Other Diagnostic Failure Codes 105

4.8 Failing Quality Assurance Test 106

4.9 Reference Counts 109

4.10 Arcing 112

4.11 Imaging Problems 114

4.12 Failing Alignment Test Results 116

4.13 Indicator Failures 118

4.14 Communications Failures 120

4.15 Viewing Quality Assurance Trends 120

4.16 MAX Board Troubleshooting 121

4.17 OMI/OMD Board Troubleshooting 122

4.18 SBC Troubleshooting 122

4.19 XORB Troubleshooting 123

Chapter 5: Service Procedures 125

5.0 Reloading LUNAR Software 127

5.1 Peaking the Detector 127

5.2 Tube Head Replacement 128

5.3 Lower Cable Bundle Replacement 129

5.4 Upper Cable Bundle Replacement 132

5.5 Tube Head Control Cable Replacement 134

5.6 Tests to Perform after Service 137

Appendix: Associated Service Documentation 141

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1

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 15 of 141

Safety

This chapter highlights safety devices and features a Service
Engineer should know before servicing a DPX-NT / MD+
system.

Chapter Contents:

1.0 General Safety

1.1 Symbols and labels found on the DPX-NT / MD+

1.1.1 Symbols

1.1.2 Labels

1.2 Emergency Stop Button

1.3 Laser Exposure

1.4 Shutter Indicator

1.5 Cautions, Warnings, and Notes

1.5.1 Caution Statements

1.5.2 Warning Statements

1.5.3 Note Statements

1.6 Safety Concerns

1.7 Scatter Radiation

1.8 Controlling Computer and Accessories

1.8.1 Electrical Safety

1.9 Peripheral configurations

1.9.1 Standard room configuration

1.9.2 Small room configuration

Figure 1-1. The DPX-NT / MD+ Display Panel
Figure 1-2. Laser Warning Label (All systems except Canada)
Figure 1-3. Laser Warning Label (Canadian Systems only)
Figure 1-4. Laser Warning Symbol (on display panel)
Figure 1-5. Source (x-rays) off - Shutter closed (green)
Figure 1-6. Source (x-rays) on - Shutter open (yellow)
Figure 1-7. Potential Pinch Points on the DPX-NT / MD+
Figure 1-8. DPX-NT Iso-Dose Diagram
Figure 1-9. DPX-MD+ Iso-Dose Diagram

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Page 16 of 141

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

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1.0 General Safety

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 17 of 141

x DO NOT attempt to service the DPX-NT / MD+ without first reading

this manual.

x DO NOT attempt any repairs without prior instructions from

authorized LUNAR personnel.

x In order to maintain electrical safety and electromagnetic

compatibility, the Lunar DPX-NT / MD+ is only to be connected to a
computer, printer, and peripherals that meet IEC requirements for
safety, such as IEC 950/ EN 60950 - “Safety of information
technology equipment, including electrical business equipment” and
IEC 601-1-2 - “Medical electrical equipment”, Part 1: General
requirements for safety, 2. Collateral Standard: Electromagnetic
compatibility - Requirements and tests.

x Ionizing Radiation: Exposure: When power is applied, this

equipment may generate ionizing radiation. Take precautions that no
part of the body passes through the x-ray beam when the equipment
is energized. Avoid scatter radiation during warm-up and testing by
maintaining a safe distance from the x-ray beam. See the Safety and
Specification manual for equipment appropriate distance and other
precautions regarding ionizing radiation. All operators must be
properly trained regarding ionizing radiation and take adequate steps
to protect against injury.

x Electric Shock: This equipment contains high voltages. When the

tabletop/panels/ shrouds are removed, visually confirm that power
cord is unplugged and remains unplugged until power is required to
complete the procedure. When servicing while energized, take
precautions to prevent electric shock.

x Moving Parts and Pinch Points: Avoid moving parts and pinch

points (e.g. belt/pulley, arm/back rail, green wheels/rail).

x Sharp Edges: Take precautions to prevent injury from contact with

component edges (e.g. OMI/OMD wheel, arm slot cover).

x Hot Surfaces: Keep hands clear or allow components to cool before

servicing. (e.g. stepper motors, hard drives, power supplies and
microprocessors).

x Heavy Lifting: Obtain help lifting or moving any object weighing over

EHS limits. Ask for assistance when maneuvering awkward objects
(e.g. tabletop).

x Laser Radiation: Do not stare into the laser beam at any time. The

reflection from the tabletop or shutter/collimator assembly is sufficient
to determine if the laser is on.

x Follow appropriate Lockout/Tagout procedures as described in

MyLearning training course GEMS-EHS-LOTOAth.

x Wear appropriate PPE (Personal Protective Equipment) while

servicing the equipment, e.g. eye protection and steel-toe/composite­toe shoes.

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1.1 Symbols and labels found on the DPX-NT /

Page 18 of 141

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

MD+

1.1.1 Symbols

x The following symbols are found on the DPX-NT / MD+, in the

Operators manual, and in the Service Manual.

Attention: contains important safety information such as the
location of a pinch point.

Emergency Stop Button: shows the location of the emergency
stop button.

Power On: shows the location of the Power On indicator.

Laser On: shows the location of the Laser On indicator.

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Shutter Open:

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 19 of 141

shows the location of the Shutter Open indicator.

X-ray On:

Type B Equipment:

shows the location of the X-Ray On indicator.

shows that the scanner has Type B

protection against electrical shock.

Protective Earth:

shows the location of a protective earth

terminal.

Functional Earth:

shows the location of a functional earth

terminal.

1.1.2 Labels

• The following labels are found on the DPX-NT / MD+ Scanner.

Laser Caution Label:

Shows that the scanner uses

a Class II laser.

Laser Caution Label:

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Canada only

Tube Head Assembly Label (All

Page 20 of 141

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

DPX-MD+ and DPX-NT System
Number 72000 and higher): This

label gives tube head assembly and x­ray source characteristics information.
It is located on the tube head
assembly and the foot panel of the
scanner.

Tube Head Assembly Label (DPX­NT System Number 71999 and
lower): This label gives tube head

assembly and x-ray source
characteristics information. It is
located on the tube head assembly
and the foot panel of the scanner.

A definition of each symbol on this label follows:

Inherent
Filtration

Tube
Insert

X-ray
Source

High Voltage Power Supply: This

label gives high voltage power supply
(x-ray generator) information. It is
located on the high voltage power
supply(s), and foot panel of the
scanner.

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Focal
Point

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X-ray Controller: This label shows x-ray controller

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 21 of 141

compliance. It is located on the foot panel of the scanner.

Collimator Assembly: This label gives collimator assembly
information. It is located on the collimator and foot panel of
the scanner.

Warning Label and Radiation Symbol: The Warning label
shows that the system uses ionizing radiation. It is found only
on systems delivered in the United States. Always obey
instructions for safe operation.

Radiation Label: This label shows that the system uses ionizing
radiation.

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Grounding Reliability Label:

Page 22 of 141

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

This label states that
grounding reliability can only be maintained when using a
“Hospital Grade” or “Hospital Only” receptacle. It is only found
on systems delivered in the United States.

Note: When replacing a certified component (x-ray controller, x-ray

tube head, collimator or high voltage power supply(s)) also
install the duplicate certified component label (supplied with
the repalcement certified component) on the foot end panel of
the scanner. The label for the new part should be palced
directly over the laber for the part it is replacing.

Refer to DXSE3001 DPX-NT / MD+ Label Replacement
Procedure (Chapter 5Appendix I - this manual) for specific
instructions.

1.2 Emergency Stop Button

• The Emergency Stop Button is located on the front of the scan arm of the
DPX-NT / MD+ scanner (see Figure 1-1). When pressed, power is
removed from the X-ray tube head, the laser, and the shutter is closed.
Power is also removed from the scan arm motors, allowing the operator/
patient to push the scan arm out of the way.

Figure 1-1. The DPX-NT / MD+ Display Panel

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1.3 Laser Exposure

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 23 of 141

• The DPX-NT / MD+ is equipped with a Class II Laser device. This laser is
used for patient positioning. A Class II rating indicates a low power visible
laser that is not normally hazardous to eyesight but has the potential to
be hazardous if viewed directly for an extended period of time. Because
of this potential hazard, DO NOT stare directly into the beam while the
laser is in operation, and DO NOT allow the beam to shine directly into
the patients' eyes. No specific eye protection is required with a Class II
laser.

• A amber laser-on indicator, located on the front of the scan arm, is lit
when the laser is on. The program activates the laser during positioning
for an image acquisition. The program then turns off the laser when you
begin the scan. The emergency stop button will turn off the laser.

• There is a caution label (Figure 1.2) on the scan arm near the Display
Panel.

Figure 1-2. Laser Warning Label (All systems except Canada)

Figure 1-3. Laser Warning Label (Canadian Systems only)

Figure 1-4. Laser Warning Symbol (on display panel)

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Note: DO NOT STARE INTO THE BEAM while the laser is

operating.

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1.4 Shutter Indicator

Page 24 of 141

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

• This symbol is used to indicate an open-shutter condition in accordance
with the safety standards established by the International
Electrotechnical Commission (IEC).

Figure 1-5. Source (x-rays) off - Shutter closed (green)

Figure 1-6. Source (x-rays) on - Shutter open (yellow)

• This symbol appears near the yellow X-ray shutter-open indicator light.
The X-ray shutter-open indicator light is located on the Display Panel on
the scan arm near the front.

Note: When the x-ray on / shutter open symbol appears in literature

associated with the DPX-NT / MD+ scanner, it will be used to
indicate that the procedure being described results in an open­shutter condition. During these times personnel should
exercise caution to avoid excessive exposure to the X-rays.

1.5 Cautions, Warnings, and Notes

• This manual contains warning and caution statements wherever
appropriate for your safety. The warnings and cautions used throughout
the manual are based on the safety standards established by the
International Electrotechnical Commission (IEC). In addition, the manual
uses notes to attract the reader's attention to important information.

1.5.1 Caution Statements

A caution statement reflects a condition
that, if not avoided, could cause
equipment or property damage.

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1.5.2 Warning Statements

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1.5.3 Note Statements

Note: This symbol turns the reader's attention to important

information which may otherwise be overlooked.

1.6 Safety Concerns

A warning statement reflects a potentially
hazardous condition that, if not avoided, could
result in serious injury.

Because the DPX-NT / MD+ Densitometer
contains moving parts, there are places on the
scanner where there is a danger of pinching.
Operators should be aware of these pinch

points to avoid injury to the patient or
themselves. Labels applied at the LUNAR factory indicate the
location of the pinch points. The pinch points and their labels
are shown in the figure 1-7.

Figure 1-7. Potential Pinch Points on the DPX-NT / MD+

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DO NOT touch live components on the DC power supply - when

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DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

the cover is off of the supply some components (such as the
heat sinks) are at line voltage and present a shock hazard

1.7 Scatter Radiation

• There is some scatter radiation from the DPX-NT / MD+ when it is
running. Figure 1-8 shows the radiation dosages while the scanner is
running at 1.50 mA at certain distances.

• These dosages are relatively insignificant as the allowed yearly dosage
for a person working with radiation emitting equipment is 5000 mRem.
Radiation however should be avoided when possible.

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Figure 1-8. DPX-NT Iso-Dose Diagram

DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

Page 27 of 141

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Figure 1-9. DPX-MD+ Iso-Dose Diagram

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DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

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1.8 Controlling Computer and Accessories

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1.8.1 Electrical Safety

• IEC and UL/CSA certification

Note: Not all scanners produced are built to IEC / UL / CSA

standards - IEC / UL / CSA compliant scanners bear the
appropriate mark on the foot end panel when the scanner was
produced and shipped in its compliant form

IEC:

To maintain electrical safety, all computer equipment and accessories
connected to the scanner must meet IEC standards for safety, such as IEC
950, “Safety of information technology equipment, including electrical
business equipment,” and IEC 801-5, “EMC Surge Immunity Requirements.”
The computer and all accessories must have “CE” labels.

UL/CSA:

accessories connected to the scanner must have saftey agency approvals fo
UL/CSA and comply with these standards.

To maintain electrical safety, all computer equipment and

See Operators manual for host computer / peripheral
configurations

1.9 Peripheral configurations

The correct connection of the computer and all
peripherals is necessary to maintain electrical safety.
The signal cable of the scanner is intended only for
connection to an approved computer. Call LUNAR
Support or your LUNAR distributor before adding
peripherals.

1.9.1 Standard room configuration

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The computer, peripherals, and all other equipment

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DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

must be located more than 1.83 m from the scanner.

Use an outlet strip to power the computer and all peripherals.

The outlet strip must be mounted off the floor so that it
does not touch other equipment.

0If the outlet strip was provided by LUNAR, it has a maximum output of 15A,
120VAC.

Only system-related equipment should be powered by the outlet strip.

A modem and/or network connection can be made at any time if you are using
the standard room configuration.

1.9.2 Small room configuration

The computer, peripherals, and all other equipment
must be powered with an isolating transformer if the
room is too small to maintain at least 1.83 m of
separation between the scanner and all other
equipment.

The isolation transformer supplied by LUNAR (part number 8544) has a
maximum output of 400/500VA.

Only system-related equipment should be powered by
the isolation transformer. Failure to use an isolation
transformer can cause leakage currents in excess of
100 microamperes.

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A modem and/or network connection can only be

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made in the small room configuration if all exposed
metal surfaces of the computer and peripherals are
out of the patient environment.

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DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

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System Overview

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2

This chapter provides an overview of the DPX-NT / MD+ system.

• In addition the chapter contains a brief discussion of major
subsystems.

• This Chapter contains the DPX-NT / MD+ Block Diagrams

2.0 DPX-NT / MD+ System

2.0.1 DPX-NT / MD+ Electronics

2.1 Electronics

2.1.1 Electronics Pan

2.1.2 Power specifications

2.2 DPX-NT / MD+ Block Diagrams

2.2.1 DPX-NT (A) Systems (71999 and lower) Power Distribution
Block Diagram (AC entrance)

2.2.2 DPX-NT (A) System (71999 and lower) Block Diagram

2.2.3 DPX NT(B) / MD+ (systems 72000 and higher) Block Diagram

2.3 DPX-NT / MD+ Fusing

2.4 Combined Single Board Controller cSBC

2.4.1 Motion Control

2.4.2 Patient Positioners

2.4.3 X-ray Source Control

2.4.4 Shutter / Collimator Drive

2.4.5 End of Exposure Alarm

2.4.6 Panel LED's

2.4.7 HVPS Control

2.4.8 ADC

2.4.9 mA Low Range

2.4.10 Detector Interface

2.4.11 Comparators and Reference DAC's

2.4.12 Bias Control

2.4.13 Communications Ports

2.4.14 Diagnostic LED's

2.4.15 Laser Control

2.4.16 Power Distribution

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2.5 X-ray Source

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2.5.1 X-ray generation and Spectrum

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DPX-NT/MD+ Service Manual (Rev. 3 - 2010)

2.6 Display Panel

2.7 High Voltage Power Supplies

2.8 D-MAX Board (DPX-NT (A) ONLY)

2.8.1 D-MAX Board Function

2.9 XORB Board (DPX-NT (A) ONLY)

2.10 Detector Sub System

2.10.1 Detector Overview

2.11 X-Ray Collimator Subsystem

2.12 DPX-NT / MD+ Specifications

2.12.1 Component specifications

2.12.2 Functional specifications

2.12.3 Maximum scan area (long x transverse)

2.12.4 Programs

2.12.5 Environmental specifications

2.12.6 Storage and transport environment

2.12.7 X-ray generator specifications

2.12.8 LUNAR 8548 and 8297 X-ray tube housing assemblies

2.12.9 Laser specifications

2.12.10 Compatible components

2.12.11 FDA certified components (US only)

2.13 Secondary Calibration / Daily QA

2.13.1 Secondary Calibration overview

2.13.2 Starting the Daily QA (secondary calibration)

2.13.3 Peak Test

2.13.4 Functional Tests

2.13.5 Reference Value Test

2.13.6 Tissue Value Test

2.13.7 BM Chamber Measurements

2.13.8 Daily QA Results

2.13.9 QA Database

Figure 2-10. DPX-NT (A) Systems (71999 and lower) Power Distribution
Block Diagram

Figure 2-11. DPX-NT (A) Systems (71999 and lower) System Block Diagram
Figure 2-13. DPX-NT / MD+ display panel
Figure 2-14. Reference axis and target angles for tube housing assembly
head assembly
Figure 2-15. Anode heating/cooling curves

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Figure 2-16. Cathode emission characteristics