GE PRODIGY Service Manual

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PRODIGY

Part Number: LUN7396 Revision: C

Service Manual

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ii Prodigy Service Manual

This document contains confidential or proprietary information of GE-Lunar Corp. 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-Lunar Corp.

GE-LUNAR Corporation 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-LUNAR Customer Support Department prior to attempting any servicing:

608-828--2663

608-826-7107 (Fax)

is a registered trademark of General Electric Company.

PRODIGY® is a trademark of GE-LUNAR Corporation.

Windows NT® is a trademark of Microsoft Corporation

Prodigy Service Manual iii

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iv Prodigy Service Manual

READ THIS FIRST

Using This Manual:

A person who will be performing service work on the PRODIGY 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 general function 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 Appendix are referred to as ways to solve problems described in Chapter 4.

Information Requested By GE-LUNAR:

When requesting assistance from GE-LUNAR, please provide the following information:

System Number (DF+xxxxx)

Institution or Doctor's name

Location

Complete list of symptoms

Names and part numbers of parts needed for service

Prodigy Service Manual v

In addition to the information above, an Error Log printout and QA’s and QA history or other failing diagnostic test printout (Alignment Test etc.) will also help to improve the accuracy of our diagnosis:

For problems with specific patient scans, it is recommended that you copy the scan files to diskette, and send it, with a description of the problem, to the Applications Department at GE LUNAR.

vi Prodigy Service Manual

1 1112

Safety

Chapter 1:Safety

This chapter highlights safety devices and features a Service Engineer should know before servicing a PRODIGY system.

Chapter Contents:

1.0 General Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

1.1 Symbols and labels found on the PRODIGY . . . . . . . . . . . . . . . . . . 1-15

1.1.1 External Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

1.1.2 Internal Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

1.1.3 Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

1.2 Emergency Stop Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

1.3 Laser Exposure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

1.4 Shutter Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

1.5 Cautions, Warnings, and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

1.5.1 Caution Statements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

1.5.2 Warning Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

1.5.3 Note Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

1.6 Safety Concerns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

1.6.1 Pinch points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

1.6.2 Laser safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

1.6.3 Radiation safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

1.6.4 Scatter Radiation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

1.7 Controlling Computer and Accessories . . . . . . . . . . . . . . . . . . . . . . 1-26

1.7.1 Electrical Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

1.7.3 Peripheral Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

1.7.4 Standard r oom configuration (system no. DF+12000 and greater)126

1.7.5 Small room configuration (system no. DF+12000 and higher) 1-27

1.7.6 Scanner power output configuration (system no. DF+11999 and

lower) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

1.7.7 W all outlet configurat ion (system no. DF+11999 and lower) . . 1-27

Figure 1-1. The PRODIGY Display Panel . . . . . . . . . . . . . . . . . . . . . . . 1-19

Figure 1-2. Laser Warning Label (U.S. systems only) . . . . . . . . . . . . . . 1-20

Figure 1-4. Laser Warning Label (International systems only). . . . . . . .1-20

Figure 1-5. Source (x-rays) off - Shutter closed (green). . . . . . . . . . . . . 1-21

PRODIGY Service Manual (Rev C - 2000) Safety113

Figure 1-6. Source (x-rays) on - Shutter open (yellow). . . . . . . . . . . . . . 1-21

Figure 1-7. Potential Pinch Points on the PRODIGY . . . . . . . . . . . . . . .1-23

Figure 1-8. PRODIGY Iso-Dose Diagram. . . . . . . . . . . . . . . . . . . . . . . .1-25

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

1-14 Safety PRODIGY Service Manual (Rev C - 2000)

1.0 General Safety

• DO NOT attempt to service the PRODIGY without first reading this manual.

• DO NOT attempt any repairs without prior instructions from authorized LUNAR personnel.

• In order to maint ain electrical safety and electromagnetic compatibility, the Lunar PRODIGY is only to be connected to a computer, printer, and peripherals that are certified to be compliant with IEC 950/EN 60950 Safety of inf ormation technol ogy equip ment, i ncludin g electri cal busi ness equipment and IEC 601-1-2 Medical electrical equipment, Part 1: General requiremen ts for safet y, 2. Collateral Standard : El ec trom agn et ic compatibility - Requirements and tests. Emergency Stop Button

1.1 Symbols and labels fou nd on the PRODIGY

1.1.1 External Symbols

• The following symbols are found on the PRODIGY, 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 butt on.

Power On: shows the location of th e Pow er O n in di c at or an d the switch position for Power On.

Power Off: shows the switch position for Power Off.

Laser On: shows t he locati on of the Las er On indi cator. It is found

only on systems delivered internationall y.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) Safety1-15

Shutter Open: shows the location of the Shutter Open indicator.

X-ray On: shows the locati o n of th e X-Ra y On ind ic a to r.

Type B Equipment: shows that the scanner has Type B

protection against electrical shock.

1.1.2 Intern al Symbols

• The followin g symbo ls are found insi de th e PRODIGY, and in the Ser vice Manual.

Protective Earth: shows the locati on of a Protective Earth Terminal.

Functional Earth: shows the location of a Functional Earth Terminal.

1.1.3 Labels

• The following labels are found on the PRODIGY Scanner.

Laser Caution Label: Shows that the scanner u ses a Class II laser. This label is not found on systems shipped to Canada.

Laser Caution Label: Canada only

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

1-16 Safety PRODIGY Service Manual (Rev C - 2000)

Tube Head Assembly La bel (system number DF+12000 and gr eater ): This label gives tube head

assembly and x-ray source characteristics information. I t is lo cat ed on the t ub e hea d ass embly and the foot panel of the scanner.

Tube Head Assembly La bel (system number DF+11999 and lower): This label gives tube he a d

assembly and x-ray source characteristics information. I t is lo cat ed on the t ub e hea d ass embly and the foot panel of the scanner.

A definition of each symbol on this label follows:

Inherent Filtration

Tube Insert

X-ray Source

Focal Point

System Label (system number DF+12000 and greater): This label gives system input power

requirements and compliance information. It is located on the foot panel of scanners. The CE mark shows compliance with UL/CSA and the Medical Device Directive 93/42/EEC.

System Label (system number DF+11999 and lower): This label gives system input power

requirements and compliance information. It is located on the foot panel of scanners. The CE mark shows compliance with UL/CSA and the Medical Device Directive 93/42/EEC.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) Safety1-17

High Voltage Power Supply: This label gives high voltage power supply (x-ray generator) information. It is located on the positive and negative power supplies, and foot panel of t he scanner.

X-ray Controller: This label shows x-ray controller 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 radiat ion.

Grounding Reliability Label: This label states that grounding reliability can only be maintained when using a “Hospital Gra de” or “Hospi tal Only” r eceptacle. I t is only f ound on systems delivered in the United States.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

1-18 Safety PRODIGY Service Manual (Rev C - 2000)

1.2 Emergency Stop Button

• The Emergency S top Bu tton is a round red butt on locat ed on t he scanne r display panel (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 ar m motors, al lowing the operator /patie nt to push the scan arm out of the way.

Figure 1-1. The PRO DIGY Display Panel

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) Safety1-19

1.3 Laser Exposure

• The PRODIGY is equipped with a Class II Laser device. This laser is used for patient posi tioning. A Class II rati ng indicates a low power vis ible laser that is not normally hazardous to eyesight but has the potential t o 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' e y es. No specific eye protection is required with a Class II laser.

• A amber laser-on indicator, located on the front of th e 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 sc an arm near the Display Panel.

Figure 1-2. Laser Warning Label (U.S. systems only)

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

Figure 1-4. Laser Warning Label (International systems only)

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

operating.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

1-20 Safety PRODIGY Service Manual (Rev C - 2000)

1.4 Shutter Indicator

• This symbol is used to indicate an open-shutter condition in acco rdance 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 s hutter-open indicator light. The X-ray shutter-open indicator light is located on the Display Panel on the scan arm near the fr ont.

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

associated with the PRODIGY scanner, it will be used to indicate that the pr ocedur e being descr ibed resul ts in an openshutter condition. During these times personnel should exercise cautio n 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 Internationa l 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.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) Safety1-21

1.5.2 Warning Statements

1.5.3 Note Statements

Note: This symbol turns the reader's attent ion to important

information whi ch may otherwise be overlooked.

1.6 Safety Concerns

1.6.1 Pinch points

The Warning label below identifies the location of possible pinch points

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

Because the PRODIGY Densitometer contains moving parts, there are places on the scanner where there is a danger of pinching. Operat ors should be aware

of these pinch points to avoid injury to the patient or themselves. When the scanner arm is in motion, make sure possible pinch point locat ions are clear at all ti mes. L abels appli ed at the LU NAR fac tory indicate the location of the pinch points. The pinch points and the ir labels are shown in the fi gure 1-7.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

1-22 Safety PRODIGY Service Manual (Rev C - 2000)

Figure 1-7. Potential Pinch Points o n the PRODIGY

1.6.2 Laser safety

Do not touch the AC Surge Suppressor (located on the AC terminal block) it may be hot.

Do not electrically connect the isolation transformer bolt head to ground, doing this will short out the transformer

Scan table isolated outlet strip must be appropriately connected.

DO NOT STARE INTO THE LASER BEAM during patient positioning and Quality Assurance procedures.

The label that foll ows i s located on the sc anner ar m and shows the loca tion of the laser aperture.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) Safety1-23

1.6.3 Radiatio n safety

X-ray exposure: The system makes radiation when el ectric voltage is

supplied to, a nd cur rent f lows t hrough , the x-ray tube. D uring a measu remen t, the shutter opens to let a beam of radiation pass through the scanner table and patient. The radiation field at the table top is 19.2 mm x 3.3 mm. Lead oxide shielding surrounds the x-ray tube in sert inside the tube housing assembly and reduces radiation levels around the scanner table.

Skin entrance dose: Table 1 of the PRODIGY Operators Safety and Specifications manual shows irradiation times and skin entrance doses.

1.6.4 Scatter Radiation

• There is some scatter radiation from the PRODIGY when it is running. Figure 1-8 shows the radiation dosages while the scanner is running at

3.00 mA at certain distances.

• These dosages ar e 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.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

1-24 Safety PRODIGY Service Manual (Rev C - 2000)

Figure 1-8. PRODIGY Iso-Dose Diagram

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) Safety1-25

1.7 Controlling Computer and Accessories

1.7.1 Electrical Safety IEC and UL/CSA certification

IEC: To maintain elect ric al sa fe ty, all computer equi p me nt and accessorie s

connected to the scanner must meet all IEC require m ents 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 the CE label.

UL/CSA: To maintain elec trical safety, all computer equipment and accessories conn ected to th e sc ann er mu st h ave safet y a gen cy appr o val s for UL/CSA.

1.7.2 Electromagnetic interference

Although the sca nner meets safety standards regarding electromagnet ic interference (EN60601-1-2), you may still e x perience a loss of performance under extreme el ectromagnetic conditions. Maximize the distance betwee n the scanner and ot her equipment, and use a dedicated power line, to avoid interference to and from the scanner.

1.7.3 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 periph erals .

Note: The scanner's output power strip can be used to supply the

Host PC with isolated power. If it is to be used the foll owing conditions must be met. If the conditions cannot be met, the scanner's output power strip cannot be used.

Note: See also Peripheral Block Diagrams - Section 2.2.3

1.7.4 Standard room configuration (system no. DF+12000 and greater)

The computer, peripherals, and all other equipment 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. If your 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.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

1-26 Safety PRODIGY Service Manual (Rev C - 2000)

A modem and/or netwo rk connecti on can be mad e at any t ime if you ar e using the standard room configuration.

1.7.5 Small room configuration (system no. DF+12000 and higher)

You must power the computer, peripherals, and all othe r equipment with an isolating trans for m er if th e roo m is to o sm a ll to ma in ta in at le as t 1. 83 m of separation between the scanner and all other equipment.

The isolation transformer supplied by LUNAR 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 leakag e currents in excess of 100 microamperes.

A modem and/or net work connection can only be made in the small room configuration if all exposed metal surfaces of the computer and peripherals are out of the patien t en v iro n me n t.

1.7.6 Scanner power output configuration (system no. DF+11999 and lower)

LUNAR recommends that you use scanner power output to provide isolated power to the computer and all peripherals. The power strip must be mounted off the floor such that it does not touch other equipment. The computer and ALL peripherals must be powered by the scanner. All other equipment must not be powered by the scanner and must be located more than 1.83 m from the scanner. Failure to u se sc ann er po we r out pu t ca n ca use le aka ge cu r rent s in excess of 100 micr oamperes.

If a network and/or modem connection is needed, refer to the wall outlet configuration.

1.7.7 Wall outlet configuration (system no. DF+11999 and lower)

As an option to scanner power output, a wall out let can be used to power the computer and peripherals. Isolated power from the scanner must not be used to power any equipment if a wall outlet is used. All exposed metal surfaces of the computer, peripherals, and other equipment must be located more than

1.83 m from the scanner. A network and/or mod em conne ction can be made to the comp uter if power is

supplied from a wall outlet as described abov e.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) Safety1-27

This page left blank intentionally.

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

1-28 Safety PRODIGY Service Manual (Rev C - 2000)

2 1112

System Overview

Chapter 1:System Overview

This chapter provides an overview of the PRODIGY system.

• In addition the chapter contains a brief discussion of majo r subsystems and illustrations of the PRODIGY power system.

• This Chapter contains the PRODIGY Block Diagrams

2.0 PRODIGY System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33

2.0.1 PRODIGY Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33

2.1 Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35

2.1.1 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35

2.1.2 Electronics Pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35

2.1.3 Scan Arm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36

2.1.4 Power specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36

2.2 PRODIGY Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-38

2.2.1 PRODIGY I (System numbers DF+11999 and lower) Power

Distribution Block Diagram (AC entrance) . . . . . . . . . . . . . . . . . 1-38

2.2.2 PRODIGY System Blo c k Diag ram PRODI GY I Sys tem Block

Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-39

2.2.3 PRODIGY I Peripheral Configuration Block Diagrams . . . 1-40

2.2.4 PRODIGY II System / Power Block Diagram . . . . . . . . . . 1-41

2.3 PRODIGY Fusing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42

2.4 PRODIGY I (system number s DF +11999 and lower) Single Board

Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43

2.4.1 SBC Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43

2.4.2 SBC Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43

2.4.3 SBC / Host PC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44

2.5 PRODIGY II Combined Single Board Controller (cSBC) (systems

DF+12000 and greater) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-45

2.5.1 cSBC System Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-45

2.5.2 cSBC Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-46

2.5.3 TRANS / LONG MOTOR Control and Status . . . . . . . . . . . . . 1-50

2.5.4 AGS ROLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51

2.5.5 AGS DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51

2.5.6 SCANNER RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-52

2.5.7 GE-LUNAR Model 7861 X-ray Generator Errors. . . . . . . . . . . 1-53

2.5.8 DC FAIL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54

PRODIGY Service Manual (Rev C - 2000) System Overview229

2.5.9 DCA / AGS / BIAS DAC's . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54

2.5.10 KV/mA DAC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-55

2.5.11 ARC/FIL DAC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-55

2.5.12 PEAK DAC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-55

2.5.13 MAX PLD Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-55

2.5.14 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-56

2.5.15 MASTER RESET. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-56

2.5.16 SUICIDE RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-57

2.5.17 MISC OUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-57

2.5.18 MISC IN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-57

2.5.19 Stepper Motor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-58

2.5.20 OMI Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-59

2.5.21 Patient Positioners. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-59

2.5.22 Limit Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-59

2.5.23 X-ray Source Control / Mechanical Interlocks . . . . . . . . . . . .1-59

2.5.24 Shutter / Collimator Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-60

2.5.25 End of Exposure Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-60

2.5.26 Panel LED's. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-60

2.5.27 HVPS Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-60

2.5.28 ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-61

2.5.29 mA Low Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-61

2.5.30 Detector Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-61

2.5.31 Communications Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-62

2.5.32 Debug RS-232 Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-62

2.5.33 Diagnostic LED's . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-62

2.6 Power Distri bution (PRODIGY II Systems DF+1200 and greater) . .1-64

2.7 Tube Head and X-ray Insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-65

2.7.1 X-ray generation and Spectrum. . . . . . . . . . . . . . . . . . . . .1-65

2.8 X-ray Generator (High Voltage Power Supply(ies)) . . . . . . . . . . . . . 1-66

2.9 MAX Board (PRODIGY I systems DF+11999 and lower only) . . . . .1-67

2.9.1 MAX Board Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-67

2.9.2 Dedicated +28VDC power supply . . . . . . . . . . . . . . . . . . .1-67

2.10 XORB Board (PROD IGY I Systems DF+11999 and lower only). . .1-68

2.11 Detector Sub System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-69

2.11.1 Detector Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-69

2.11.2 Detector Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-69

2.11.3 Detector Daughter Board Overview. . . . . . . . . . . . . . . . .1-70

2.11.4 Detector Daughter Board Operation . . . . . . . . . . . . . . . .1-71

2.11.5 Detector Mother Board Overview. . . . . . . . . . . . . . . . . . .1-72

2.11.6 Detector Mother Board Operation . . . . . . . . . . . . . . . . . .1-72

2.12 FOINK (PRODIGY I Systems DF+11999 and lower only) . . . . . . . 1-74

2.12.1 FOINK Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-74

2.12.2 Motion Control and Detection . . . . . . . . . . . . . . . . . . . . .1-74

2.13 Display Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-75

2.14 Audible X-RAY OFF Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-77

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-30 System Overview PRODIGY Service Manual (Rev C - 2000)

2.15 X-Ray Collimator Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-78

2.16 PRODIGY Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-79

2.16.1 Component specifications. . . . . . . . . . . . . . . . . . . . . . . . 1-79

2.16.2 Functional specifications. . . . . . . . . . . . . . . . . . . . . . . . . 1-79

2.16.3 Maximum scan area (long x transverse). . . . . . . . . . . . . 1-79

2.16.4 Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-80

2.16.5 Environmental specifications. . . . . . . . . . . . . . . . . . . . . . 1-80

2.16.6 Storage and transport environment. . . . . . . . . . . . . . . . . 1-81

2.16.7 X-ray gene rator (system no. DF+12000 and higher). . . . 1-81

2.16.8 X-ray gene rator (system no. DF+11999 and lower) . . . . 1-83

2.16.9 GE-LUNAR 8022 x-ray tube . . . . . . . . . . . . . . . . . . . . . . 1-85

2.16.10 GE-LUNAR 8743 x-ray tube head assembly (system no.

DF+12000 and higher) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-86

2.16.11 LUNAR 6838 x-ray tube head assembly (system no.

DF+11999 and lower). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-87

2.16.12 Laser specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-88

2.16.13 Compatible components . . . . . . . . . . . . . . . . . . . . . . . . 1-89

2.16.14 FDA Certified Components (USA Only) . . . . . . . . . . . . 1-89

2.17 Secondary Calibration / Daily QA. . . . . . . . . . . . . . . . . . . . . . . . . . 1-91

2.17.1 Secondary Calibration overview . . . . . . . . . . . . . . . . . . . 1-91

2.17.2 Starti ng the Dail y Q A (se c on d ary calibration) . . . . . . . . . 1-91

Peak Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-92

2.17.3 Tests Performed in the Secondary Calibration . . . . . . . . 1-92

2.17.4 QA Database. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-94

Figure 2-9. PRODIGY System Exploded View of External Covers and

associated hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33

Figure 2-10. PRODIGY I NTC thermistor on the Primary Terminal Block1-35

Figure 2-11. PRODIGY I Power Distribution Block Diagram . . . . . . . . . 1-38

Figure 2-12. PRODIGY I (system s DF+11999 and lower) Block Diagram1-39 Figure 2-13. PRODIGY I (Systems DF+11999 and lower) Peripher al

Configuration Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-40

Figure 2-14. PRODIGY II Sy st em / Powe r Blo c k Dia g ram . . . . . . . . . . . 1-41

Figure 2-15. Detector Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-69

Figure 2-16. Detector Daughter Board Operation . . . . . . . . . . . . . . . . . 1-71

Figure 2-17. PRODIGY Detector Module . . . . . . . . . . . . . . . . . . . . . . . . 1-73

Figure 2-18. PRODIGY display panel. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-75

Figure 2-19. Reference axis and target angles for tube head assembly 1-85

Figure 2-20. Anode heating/cooling curves . . . . . . . . . . . . . . . . . . . . . . 1-86

Figure 2-21. Cathode emission characteristics . . . . . . . . . . . . . . . . . . . 1-88

Figure 2-22. X-ray tube assembly heating/cooling curves . . . . . . . . . . . 1-88

Figure 2-23. PRODIGY Daily QA printout with expected values . . . . . . 1-95

Table 2-1. PRODIGY I (Systems DF+11999 and lower) Fuses . . . . . . . 1-42

Table 2-2. PRODIGY II (systems DF+12000 and greater) Fuses. . . . . . 1-42

Table 2-3. PRODIGY Component Specifications . . . . . . . . . . . . . . . . . . 1-79

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-31

Table 2-4. X-ray generator technical information. . . . . . . . . . . . . . . . . . .1-81

Table 2-5. Table 4. X-ray generator technical information. . . . . . . . . . . .1-83

Table 2-6. LUNAR 8022 X-ray tube technical information.. . . . . . . . . . .1-85

Table 2-7. LUNAR 8743 x-ray tube assembly technical information. . . .1-86

Table 2-8. LUNAR 6838 x-ray tube assembly technical information. . . .1-87

Table 2-9. Laser specifications.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-88

Table 2-10. FDA certified componen ts (system no. DF+12000 and higher).189

Table 2-11. FDA certified components (system no. DF+11999 and lower).1-90

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-32 System Overview PRODIGY Service Manual (Rev C - 2000)

2.0 PRODIGY System

The PRODIGY includes the patient table and frame, X-ray tube, X-ray generator, detector, and arm. Its physical specifications are summarized in section 2.15.

The PRODIGY has a mechanical design with two separate motion systems that are capable of simultaneous operation. These are transverse, and longitudinal. Both motion systems are dri v en by stepper motors.

2.0.1 PRODIGY Electronics

The internal components of the scanner are safely secured by a number of panels, including the scanner's tabletop.

Figure 2-9. PRODIGY System Exploded View of External Covers and

associated hardware

• The front and side panels are secured by screws from the inside.

• The rear panel is se cured by screws from the outside.

• The table top is screwed down from the top.

Note: Prima ry Service access to the electronics of the scanner is

through the table to p.

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-33

• The Detector electronics (in the scan arm) are secured by an upper and lower shroud, held in pl ac e by scre w s.

• Each metal panel is grounded to the electronics pan.

It is not usually necessary to remove the front and back panels for most service needs. However, if access is needed to the Front and Rear Longitudinal Car riages, these can be removed.

The back panel is secured by hex socket head -head screws and must be slid out of the way, for it is between the Arm Column and the frame.

If access is needed to the detector, Transverse Limit Switches or the other components mounted above in the arm, the covers of the arm must be removed.

• The upper scan arm shroud can be removed by loosening the two screws holding it in place (on the back of the arm column) and tipping it forward.

• The lower cover is held in place by four screws, two in the front and two in the back, be sur e to remove the ground wire for the metal portion of the lower cover as well

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-34 System Overview PRODIGY Service Manual (Rev C - 2000)

2.1 Electronics

2.1.1 Cautions

PRODIGY I electronics use Negative Temperature Coefficient (NTC) thermistors to limit the in rush current of the AC isolation transformer and the Detector Mother Board. These devices have a high resistance when cold and decrease in resist ance when warm.

PRODIGY electronics are static sensitive, take static control precautions before servicing scanner circuitry.

Figure 2-10. PRODIGY I NTC thermistor on the Primary Terminal Bl ock

• A cool down period of 30 seconds is required before power is turned on on the system.

PRODIGY I ONLY: Failure to allow the system to “cool down” may cause the circuit breaker for the AC line to tri p and / or the + 12VDC for the Detector Mother Board (DMB) will not come up to +12 VDC.

Note: The error log entry "DMB Power Cycle observed" is an

indicator tha t the DC power to the Detector Mother Board has been interrupted and the system should be powered down for 30 seconds to restore power to the Detector Mother Board.

PRODIGY I ONLY: The NTC’s can get hot - they are located on the AC terminal block and on the DC terminal bl ock be ca r eful w h en s ervi cin g t hes e areas of the scanner.

2.1.2 Electronics Pan

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-35

The electronic c omponents of the PRODIGY are mount ed on the grounded Electronics Pan which is horizontally fastened inside the frame.

Note: Append ix 2 A contains a la yout drawi ng of the Electr onics Pan

for PRODIGY I and PRODIGY II systems.

PRODIGY I Systems (System numbers DF+11999 and lower):

• There are four l ow-volt age linear DC power sup plies ( under 30V DC), and two high-voltag e DC power s upplies (t o supply 7 6kV to the x -ray tube ) on the pan.

• In addition to t he pow er su pp li es, t he e lec tro ni cs mou nt ing ch ass is h ol ds four printed circuit boards, a stepper motor controller, the audible a larm, an AC entrance/line filter/fuse holder, an isolation transformer and a terminal strip for AC power distribution to the Host PC and peripherals.

PRODIGY II Systems (System numbers DF+12000 and greater):

• There is one low- voltage DC s witching power su pply (unde r 30VDC), and one high-voltage D C power supply (x-ray generat or - supplies 76kV to the x-ray tube) on t he pan.

• In addition to t he pow er su pp li es, t he e lec tro ni cs mou nt ing ch ass is h ol ds one printed cir cui t bo ar d, a st ep per mot or c ont rol le r, and an A C en tran ce/ line filter/fuse holder.

2.1.3 Scan Arm

• The scan arm contains one high-voltage power supply (1000VDC / +12 VDC input) is located in the upper arm near the X- ray detector and provides power to t he Detector Array.

• The scan arm also houses the detector and 5 associated printed circuit boards, and a stepper motor contoller.

2.1.4 Power specifications

Leakage current

• Total System with Isolation Transformer: <100 microamperes.

• Scanner Table alone: <100 microamperes.

Scanner input power

• PRODIGY I ONLY: The scanner has 12 d ifferent nominal in puts: 100, 110, 115, 120, 125, 127, 200, 220, 230, 240, 250, and 254 VAC. During installation, the scanner is configured for the nominal input which best matches the voltage on site.

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-36 System Overview PRODIGY Service Manual (Rev C - 2000)

• PRODIGY II ONLY: The scanner can accept any AC input be tween 100 and 254 VAC.

• Voltage may fluctuate ±10% from the nominal value without a loss of scanner performance.

• The nominal input (range of inputs) can be found on the system label.

• The rated power input is 1500 VA.

• The input power must meet IEEE 519-1992 for pow er quality and total harmonic distortion (THD <5%).

Scanner output power (PRODIGY I system numbers DF+11999 and lower only)

• The scanner has 3 different nominal out puts: 100, 120, 240 VAC.

• The nominal volt ag e outp ut of t he s cann er is show n o n the sys te m lab el .

• The computer and all peripherals which use the scanner output power must be rated for this voltage.

• The maximum power output is 400 VA.

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-37

2.2 PRODIGY Block Diagrams

The block diagrams for the PRODIGY system follow:

2.2.1 PRODIGY I (System numbers DF+11999 and lower) Power Distribution Block Diagra m (AC ent ranc e)

Figure 2-11. PRODIGY I Power Distribution Block Diagram

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-38 System Overview PRODIGY Service Manual (Rev C - 2000)

2.2.2 PRODIGY System Block Diagram PRODIGY I System Block Diagram

Figure 2-12. PRODIGY I (systems DF+11999 and lower) Block Diagram

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-39

2.2.3 PRODIGY I Peripheral Configuration Block Diagrams

Figure 2-13. PRODI GY I (Systems DF+11999 and lower) Peripheral

Configuration Block Diagrams

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-40 System Overview PRODIGY Service Manual (Rev C - 2000)

2.2.4 PRODIGY II System / Power Block Diagram

Figure 2-14. PRODIGY II System / Power Block Diagram

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-41

2.3 PRODIGY Fusing

PRODIGY I (system numbers DF+11 999 and lower) Fuses

Fuse Rating Type*

F1 (Computer AC) T 2.0 AL 5x20MM F2 (Computer AC) T 2.0 AL 5x20MM F3 (+5, +/-12 VDC

PS (1))

F4 (+5, +/-12 VDC

PS (2)) F5 (+26VDC PS) T 2.5 AL 5x20MM F6 (+28VDC PS) T 0.63 AL 5x20MM

F7 (+5, +/-12VDC

PS (1))

F8 (+5, +/-12VDC

PS (2))

F9 (+26 VDC PS) T 2.5 AL 5x20MM

F10 (+28 VDC PS) T 0.63 AL 5x20MM

MAX PCB F1 F 0.5 AL 1/4x1 1/4 in.

All fuses are 250V , low breaking capacity ( 25A minimum)

Table 2-1. PRODIGY I (Systems DF+11999 and lower) Fuses

T 1.25 AL 5x20MM

PRODIGY II (systems DF+12000 and greater) Fuses

Fuse Rating Type

Condor PS

COndor PS

All fuses are 250V , low breaking capacity ( 25A minimum)

Table 2-2. PRODIGY II (systems DF+12000 and greater) Fuses

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-42 System Overview PRODIGY Service Manual (Rev C - 2000)

F3.15 AH 5x20 mm

2.4 PRODIGY I (system numbers DF+11999 and lower) Single Board Controller

2.4.1 SBC Functions

The microprocessor-based Single Board Controller (SBC) provides overall operation and con trol of the scan table.

Control Functions

• Control of x-ray source power supplies, and shutter / collimator in a fail safe manner.

• Provides control signals for two external stepper motor drives (Centent) to scan patient in a fail safe manner and senses limit switch actuation at the limits of travel (via FOINK see 2.11).

• Controls the detector array (communicates with the Detector Mother Board, section 2.10.2).

• Responds to exter nal scanner failure signals ( interrupts generated by SBC, FOINK see 2.11, and Detector Mother Board see 2.10).

Communication

• Communicates with PC host via an optically isolated RS-422 interface.

• Collects data from the detector array.

2.4.2 SBC Reset

All SBC circuitry resets when the microprocessor resets. This is done during power up, and can also be done over the communication port (via the host), through connections to other circuit boards (especially the Detector Mother Board, as a fail -safe shutdown), the by pressing the reset button on the SBC, by pressing the Emergency Stop Button on the arm, or when a fault is detected by the SBC or the FOINK (section 2.11.1).

Error Conditions Sensed by the SBC:

• Loss of Communications with the Detector Mother Board (DMB).

• Loss of Communications with the Host PC.

• Limit Switch tripped when shutter is open.

• Limit Switch depressed when commands are being sent.

• Failure in x-ray source kV programming

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-43

• Interrupt sent by FOINK

The DMB will reset the SBC if it detects an error. Error Conditions of the DMB sensed by the SBC:

• PLD programming failure

• Loss of +5 or +12 VDC

• Loss of Communications with SBC

• Corrupt FIRMWARE

•FLASH RAM Failure

• DTR Reset button on the DMB is pressed

2.4.3 SBC / Host PC Interface

The SBC communicates with the Host PC via an RS-422 interface. This is a serial connection capable of transmitting more data than a standard RS-232 port. As it is not a standard serial port a R S-485 card must be installed into one of the Host P Cs expansi on slots an d the po rt must be configu red correct ly for the PRODIGY t o opera te corr ectl y (see D XPC20 00 chapter 5 appen dices ).

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2-44 System Overview PRODIGY Service Manual (Rev C - 2000)

2.5 PRODIGY II Combined Single Board Controller (cSBC) (systems DF+12000 an d greater)

The cSBC printed wiring board (PWB) is an eight layer rectangular board measuring 7.400" x 8.100". The PWB is mounted in the via four mounting holes located 1/4" from each corner and 2 additional interior mounting holes. The components are p rimari ly s urface mount , wi th boar d co nnector s, headers and a few single-style ICs being the only exceptions.

Four layers we re dedicated for routing layers. Sensitive s ignals were noted and routed manu ally and isola ted f rom mor e power ful signals to r educe s ignal interference and crosstalk on the same routing layer. The main power and ground planes wer e s tacke d a dj ace ntly on th e c ent ral i nn er l aye rs t o inc re ase inter-planar c apacitance thus reducing ground bounce and power suppl y noise. Traces on the top and bottom layers were kept as short as reasonably possible and tapped down to an internal trace layer through vias.

Component placem ent is arranged to separate analog from digital circuitry. Further isolat ion was achieved by segmenting the power and ground planes into analog and d igital secti ons an d denyi ng anal og/d igital plane over lap, th us preventing digital noise from couplin g into the analog section. All scanner control I/O is run via conn ectors locat ed on the +24V plane section. The +24 V plane is fully optically isolated from both the analog and digital plane areas to prevent motor noise from coupling int o the analog section, to prevent DC switching noise from radiating on scanner cables, and to prevent ESD presented at cable inputs from reaching the digital IC's.

2.5.1 cSBC System Architecture

The cSBC employs an Intel 80C251 micro-controller as its processor. This processor provides 1K of on-board RAM and no on-board ROM. The controller is clocked at 16 MHz using a crystal.

cSBC Memory Space

The cSBC is designed to support a JEDEC-standard, non-volatile FLASH memory device up to 512K x 8 bits in size for code and f ixed data. The board supports either 128K or 512K SRAM memory device as needed for program volatile memory. Complete address decodi ng is provided via the MAX PLD, the CBSC bus master, allowing the address space to be arbitrary an d changed via the PLD code. The 80251 can address four 64K segments, referred to as 0x00, 0x01, 0xFE and 0xFF as per Intel literature. The firmware has the ability to map any FLAS H or SRAM seg ment t o any CPU segme nt via SFR’s in the MAX PLD.

FLASH RAM

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-45

At startup the CPU executes the boots code which programs the FLEX PLD and then maps in eithe r NT or Pro digy ru ntim e firmw are as appr opriat e based on the most signif icant bit of the CCA REV register. To switch from boot code to run code the firmware jumps to SRAM and executes a code snippet which pages the boot code out of 0xFF and the desired f irmware into 0xFF. The snippet then jumps from SRAM back to 0xFF to execute the firmware. A boot jumper, JP4 is provided to optionally force the CPU to remain in the boot code. When the boot jumper is installed the b oot code runs the host port at

115.2KB.

SRAM

The cSBC contains a single 128K x 8 bit SRAM which provides read/write memory. The SRAM's segments are arbitrarily mapped to any CPU segment by the CPU mapping registers.

2.5.2 cSBC Functions

The microprocessor -based Single Board Controller (cSBC) provides overall operation and co ntrol of the scan table.

FLEX PLD Peripherals

The majority of s c anner related programmable logic functionality is contained in the FLEX PLD, an Alt era EP F6024 AQC 20 8-3 de vic e. De vic e prog r ammi ng is handled exclusively by the CPU. On each cold boot the CPU reprograms the FLEX devices from an image stored in it's FLASH. As such a firmware download of a new FLE X image is required to permanently upgrade the PLD code.

The functional c omponents of the programmabl e logic are discussed in the following subs ections. Polarity of operation can be inferred from bit names and use of preceding slash for inverted logic bits.

Note that ports A-F are reloaded with default values at time of CPU reset and remain in the default state until SCANNER_RESET has been cleared and new values are wr it ten by the firm w a re. Defa ults for port F and all othe r registers are invoked at power up only.

PORT A

Bit Name R/

0 trans_enable R/W 0 Transverse motor enable – low blocks trans motor pulses and

1 /trans_fwd R/W 0 Transverse motor direction control. 2 /shutter_open_ctrl R/W 1 Shutter solenoid control. 3 trans_lsw_override R/W 0 Transverse limit switch override – prevent limit switch contact

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Def. Description

forces Centent drive to standby current level.

from blocking step pulses at hardware level.

2-46 System Overview PRODIGY Service Manual (Rev C - 2000)

4 long_enable R/W 0 Longitudinal motor enable – low blocks trans motor pulses and

forces Centent drive to standby current level. 5 /long_fwd R/W 0 Longitudinal motor direction control. 6 long_lsw_override R/W 0 Longitudinal limit switch override – prevent limit switch contact

from blocking step pulses at hardware level 7 /collimator_open_ctrl R/W 1 Collimator solenoid control.

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-47

PORT B

Bit Name R/

0 /trans_front_lsw R N/A Transverse front limit switch position. 1 /trans_back_lsw R N/A Transverse back limit switch position. 2 /long_foot_lsw R N/A Longitudinal foot limit switch position. 3 /long_head_lsw R N/A Longitudinal head limit switch position. 4 trans_count_eq[0] R N/A Set when transverse step counter equals zero. 5 long_count_eq[0] R N/A Set when longitudinal step counter equals zero. 6 /shutter_open_sense R N/A Shutter limit switch position. 7 /collimator_open_sense R N/A Collimator limit switch position.

Def. Description

PORT C

Bit Name R/

/long_rev_pos

R N/A Patient positioner (joystick) input.

Def. Description

/long_fwd_pos

/trans_rev_pos

/trans_fwd_pos

/hvps_ac_relay

/motor_fail_enable

ags_enable

/motor_power

R N/A Patient positioner (joystick) input. R N/A Patient positioner (joystick) input. R N/A Patient positioner (joystick) input. R/W 1 Enable AC power to X-ray HVPS. R/W 1 Arm logic to shutdown scanner if OMI inputs not sensed. R/W 0 Enable detector automatic gain control feedback circuit. R/W 1 Enable 24VDC to the stepper motor drives (a.k.a. Centents).

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2-48 System Overview PRODIGY Service Manual (Rev C - 2000)

PORT D

Bit Name R/

flex_max_i/o_[0]

flex_max_i/o_[1]

flex_max_i/o_[2]

flex_max_i/o_[3]

flex_diag_3

pit_enable

flex_diag_1

/laser_on

R/W 0 Output signal to MAX PLD (diagnos tic use only). R/W 0 Output signal to MAX PLD (diagnos tic use only). R/W 0 Output signal to MAX PLD (diagnos tic use only). R/W 0 Output signal to MAX PLD (diagnos tic use only). R/W 0 Firmware controlled diagnostic LED. R/W 0 Enable Programmable Interval Timer output pulses. R/W 1 Firmware controlled diagnostic LED. R/W 1 Patient locator laser control.

PORT E

Bit Name R/

low_range_dac

R/W 0 Switches mA DAC from 2.048V to 0.500V reference.

Def. Description

trans_motor_accel

low_range_adc

long_motor_accel

hvps_vendor_id

iq_hvps

/hvps_enable_status

/power_up

R/W 0 Enables motor interrupt on every micro step. R/W 0 Switches ADC from 5.000V to 0.500V reference. R/W 0 Enables motor interrupt on every micro step. R N/A For 7681 supply, 0 = Spellman, 1 = Bertan. R N/A Set by resistor placement to indicate 0311/0312 supplies. R N/A Enable status monitor from 7681 supply. R N/A Set to indicate cold boot.

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-49

PORT F

Bit Name R/

/motion_fail_enable

long_motor_fail_axis

/hvps_enable

flex_diag_2

/arm_estop_sense

spare_jmp_[1]

spare_jmp_[0]

cpu_p1_2

R/W 1 Arm scanner shutdown if OMI pulses w/o step pulses. R/W 0 Motor fail circuitry axis control, clear for transverse. R/W 1 Enable output to 7681 supply. R/W 0 Firmware controlled diagnostic LED. R N/A Emergency stop sense bit. R N/A Unused input, resistor or jumper selectable on CCA. R N/A Unused input, resistor or jumper selectable on CCA. R N/A Firmware controlled diagnostic LED.

PORT G

Bit Name R/

adc_mux_[0]

R/W 0 ADC analog MUX input selection control bit.

Def. Description

adc_mux_[1]

adc_mux_[2]

adc_mux_[3]

adc_mux_enable

8ms_clock

unused

R/W 0 ADC analog MUX input selection control bit. R/W 0 ADC analog MUX input selection control bit. R/W 0 ADC analog MUX input selection control bit. R/W 0 ADC MUX output enable control. R/W 0 Clock output provided to MAX PLD. N/A N/A For expansion. N/A N/A For expansion.

2.5.3 TRANS / LONG MOTOR Control and Status

Dual axis stepper motor control is provided entirely by the FLEX PLD . To make a typical move the firmware loads a starting velocity into the 16 bit VELOCITY register, the total number of steps for the move into the 16 bit TARGET register, and step at which to next interrupt the CPU into the 16 bit STEP register. Velocity is in ter ms of per iods of th e 2.0MHz fundamen tal clock per micro step pulse to the stepper drive. The drives provide 10 micro steps per full step. The firmware can track move status by reading the 16 bit READ register.

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2-50 System Overview PRODIGY Service Manual (Rev C - 2000)

As part of the setup for a move the host and/or fi rmware must enable the motors via the /motor_power, trans_enable, and long_enable outputs and setup the trans_lsw_override, long_lsw_override, /motion_fail_enable, / motor_fail_ena ble, and l ong_m otor_f ail_ axis outputs as desire d. I f the syste m is in scanner reset for any reason the FLEX PLD will over-ride the / motor_power output and prevent 24V power from reaching the motor drives. Addressing for t he motor control interface is provided below.

2.5.4 AGS ROLL

This is a read only 8 bit register which returns the count of AGS roll-over events since the previous read of the regis ter. The AGS roll counter is reset on read only - it is not tied to the PIT's sample clock.

2.5.5 AGS DAC

This port provides R/W access to the AGS circu it's 8 bit U/D counter. The counter is tied via a dedicated 8 bit bus to the AGS DAC. The DAC's analog voltage is tied t o the gain control input of the variable gain amplifier (VGA) used to control gain of the detector input signal. As such the firmware can read this counter to determine the current DAC voltage level and hence gain level. If ags_enable is low this port gives t he firmware direct contr ol of the AGS DAC as a parallel R/W device. If ags_ena ble is high, the firmwar e can write to the port but the DAC will continue to respond to UP/DOWN requests from the AGS DCA circuitry and hence quickly return to the AGS current operating voltage.

HE/LE COUNTERS

These read only ports provide access to the 16 bit e vent counters which are incremented ea ch time the DCA circuitry detects an input pulse within the HE or LE windows (as defined by the LEL, LEH, HEL, and HE H DAC settings). These counters are read in two 8 bit bus cycles, MSB then LSB. The event counters themsel ves cons ist of a count ing eleme nt and a bus el ement. On the rising edge on the PIT output pulse the counting elements are latched to the bus element. The PIT output is also tied to CPU external INT 1 and as such the firmware interrupt handler then has until the next rising PIT edge to read the counters before the bus elements are la tched over with the next sample count and data is lost.

PIT MSB/LSB

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-51

The PLD provides a programmable interval tim er (PIT) to the CPU. The PLD prescales it's i nput clock to generate a PIT base clock of 100KHz. The CPU writes a 2 by te word to the PIT rel oad regi ster MSB /LSB. T he CPU the n raise s the pit_enable bit to start the timer. In response to the rising edge on the pit_enable, the PIT loads the reload word in to it's counting element and begins counting down. When the count rolls und er the PIT asserts / SAMPLE_INT, reloads the counting element, and begins another count down sequence. The /SAMPLE_INT line is tied internally to the HE and LE event counters and causes a synchronous latch of both counting elements. The / SAMPLE_INT line is also tied to the processor's 2nd external interrupt line, / INT1. The CPU interrupt handler reads the latched event counters and ships the data to the host.

2.5.6 SCANNER RESET

The scanner reset register is used to provid e failsafe shutdown operation of the scanner. A falling edge on any of the inputs to this register will latch the current value of th e re gister and drop t he / SCAN_FAIL_ANY output. The MAX PLD latches the mast er res et regi st er a nd rai ses C PU_RE SET i n r e sponse to the falling edge on /SCAN_FAIL_ANY. The MAX PLD also provides SCANNER_RESET as the logical OR of CPU_RESET and!/ SCAN_FAIL_ANY. The FLEX PLD uses it's SCANNER_RESET input as the enable bit to the tri-state buffer s used to drive all safety c ritical output lines including shutter control, HVPS relay control, motor relay control, etc. As such the scanner is locked into a fail-safe mode whenever SCANNER_RESET is asserted.

The MAX's master reset register will remain latched until the nex t rising edge on the HOST_RTS input. When the cSBC is latched into reset by a scanner error it will remain in CPU reset until the host drops the RTS line and reasserts it. It will rema in in sc anner re set unti l t he CPU r eads th e scann er r eset register following the next raising edge of the RTS line at which the condition causing the /SCAN _ FAIL_ANY has bee n cl ea re d. The firm w a re pa s ses the value of the reset registers to the host to allowing the host to display appropriate error messages to the operator. The host will be unable to perform any scanner related operations until the SCANNER_RESET has been cleared. Red diagnostic LED's (see 2.5.33) are provided for both scanner and CPU reset lines. The CPU reset lin e is tied to the host CTS output such that the host se es a CTS e vent when t he cSBC en ters C PU reset. The host code provides a CTS event handler which reads the reset registers and prompts the use r accordingly.

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2-52 System Overview PRODIGY Service Manual (Rev C - 2000)

The firmware can also initiate a reset sequence in response to fatal error conditions by writing a 'death code' to the suicide reset register. Resets can also be initiated by the manual push button on the cSBC and by a low 5VDC power conditio n as sens ed by th e MAX70 5 superv isor. The scanner regis ter is also latched at the end of read cycles such that curr ent status can be ascertained by a double read. A bit map of the scanner reset register is provided belo w

Bit Name R/

thermostat_open_sense 1 /external_estop_sense R N/A Emergency stop input from external options block. 2 /dc_power_fail R N/A Loss of one or more of +5VDC,+12VDC,-12VDC, or +24VDC. 3 /long_motor_fail R N/A Motor failure detected on longitudinal axis. 4 /trans_motor_fail R N/A Motor failure detected on transverse axis. 5 /dmb_error R N/A DMB dropped it’s CTS indicating a DMB reset event. 6 /motion_fail R N/A OMI pulses detected without step pulse (manual arm motion). 7 /watchdog_reset R N/A Watchdog time-ou t indicates firmware crash.

R N/A Tube head thermostat over temperature.

Def. Description

2.5.7 GE-LUNAR Model 7861 X-ray Generator Errors

The HVPS error re gister is used to monitor the status of the 7681 X-ray source HVPS. If the register value is not equal to 0xF when /hvps_enabl e is low, the FLEX will raise the HVPS_ERROR_INT output to the MAX PLD. The MAX PLD latches t hi s i nt o t he II R regi st er an d is sue s an inte rr u pt to the C PU. As such status of the HVPS is monitored when the unit is enabled. The handler for HVPS interrupt reads this register to determin e the cause of the interrupt. The HVPS register is also latched at the end of read cycles such that current status can be ascertained by a double read. A bit map of the register is provided below.

Bit Name R/

0 /hvps_error_0 R N/A Error code bit from 7681 supply. 1 /hvps_error_1 R N/A Error code bit from 7681 supply. 2 /hvps_error_2 R N/A Error code bit from 7681 supply. 3 hvps_enable_status R N/A Set when /hvps_enable == /hvps_eanble_status 4 Unused N/A N/A Expansion room. 5 Unused N/A N/A Expansion room.

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Def. Description

PRODIGY Service Manual (Rev C - 2000) System Overview 2-53

6 Unused N/A N/A Expansion room. 7 Unused N/A N/A Expansion room.

2.5.8 DC FAIL

The DC fail error register latches the status of the DC power monitors at the time of reset. If sc anner reset code indicates /dc_power_fail the firmware can read this register to iden tify the specifi c DC source fa ilur e. The reg iste r is also latched at the end of read cycles such that current status can be ascertained by a double read.

Bit Name R/

0 /plus_scanner_fail R N/A Loss of +24V power input. 1 /plus_analog_fail R N/A Loss of +12V power input. 2 /minus_analog_fail R N/A Loss of -12V power input. 3 Unused N/A N/A Expansion room. 4 Unused N/A N/A Expansion room. 5 Unused N/A N/A Expansion room. 6 Unused N/A N/A Expansion room. 7 Unused N/A N/A Expansion room.

Def. Description

2.5.9 DCA / AGS / BIAS DAC's

The cSBC uses a sing le 10 b it oc ta l DA C, t he Lin ear Technology LTC1660, to generate the A GS a nd DA C wi nd ow r ef eren ce vo lt ag es an d the bia s pr og ram voltage. The DAC u tilize s a serial interfa ce and as suc h is not ac cessed with a traditional CPU write cycle. To load the device the firmware writes to the DAC address listed a bove, in response to which the MAX drops the /CS line to the device. The firmware then manipulates the local serial bus clock and data lines to load the DAC setting. The desired DAC channel address in encoded into the first 4 bits of the output data word. A read is then made to the DAC address, in response to which the MAX raises the /CS line. See device data sheet and analog section below for further DAC details.

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2-54 System Overview PRODIGY Service Manual (Rev C - 2000)

2.5.10 KV/mA DAC

The cSBC uses a single 12 bit dual DAC, the Linear Technology LTC1454, to generate the HVPS kV and mA program voltages. The DAC utilizes a serial interface and as such is not accessed with a traditional CPU write cycle. To load the device the firmware writes to the DAC address listed above, in response to which the MAX drops the /CS line to the device. The firmware then manipulates the local serial bus clock and data lines to load the DAC setting. Both DAC channels must be written together, CHA (kV) first followed by CHB (mA) in a 24 bit stream pa c ke t. A read is then ma de to th e DA C address, in response to which the MAX raises the /CS line. See device data sheet and analog section below for further DAC details.

2.5.11 ARC/FIL DAC

The cSBC uses a single 10 bit dual DAC, the Linear Technology LTC1661, to generate the HVPS filament limit and arc detect threshold voltages. The DAC utilizes a serial interface and as such is no t accessed with a traditional CPU write cycle. To load the device the firmware writes to the DAC address listed above, in response to which the MAX drops the /CS line to the device. The firmware the n m ani pula te s t he l ocal ser i al bu s c lo ck and da ta l ines to l oad t he DAC setting. T he de sir ed DAC c hanne l add ress in e ncoded into the f ir st 4 bits of the output data w ord. A read is then made t o the DAC addr ess, in resp onse to which the MAX raises the /CS line. See dev ice data sheet and analog section below for further DAC details.

2.5.12 PEAK DAC

The cSBC uses a 12 bit DAC, the Linear Technology L TC8043, to generate the detector peak gain voltage. The DAC utilizes a serial interface and as such is not accesse d with a trad itiona l CPU wr ite cyc le. To load the device the firmware manipulates the local serial bus clock and data lines to output load the DAC setting and then perf orms a write/read cycle to the DAC address listed above to pulse the DAC's load line low. See device data sheet and analog section below for further DAC details.

2.5.13 MAX PLD Peripherals

The programmable logic section is based on an Al tera MAX EPM7128STC100-15 device. The configuration pins for this device are t aken to a JTAG style 10 pin hea der to al low fo r in-ci rcui t progr ammin g of the de vice from the Altera By te-Blaster. The MAX device is FLASH based (non-volatile) and is programmed at the time of CCA assembly. The functional components of the programmabl e logic are discussed in the following subsections.

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-55

2.5.14 Interrupts

The CPU's interrupt capacity is effectively increased by running several interrupt signals to a register in the MA X PLD and tying the register output to the CPU external INT 0 input. Th e firm war e in te rrup t ha n dl er for INT 0 then reads this regi ster to identify the sour ce of the interrupt and handles it accordingly. The firmware then writes a bit masked '1' back to the IIR to clear the bit of the interrupt it has serviced (the R/C in the table stands for READ/ CLEAR).

Bit Name R/

0 HOST_UART_INT R/C N/A Host UART interrupt. 1 DEBUG_UART_INT R/C N/A Debug UART interrupt. 2 DMB_UART_INT R/C N/A DMB UART interrupt. 3 HVPS_ERROR_INT R/C N/A HVPS error interrupt. 4 8mS_CLOCK R/C N/A 8ms clock tick interrupt from FLEX PLD. 5 POWER_FAIL_INT R/C N/A Power down pending in 5ms interrupt from DC supply. 6 Unused N/A N/A Expansion room. 7 Unused N/A N/A Expansion room.

Def. Description

2.5.15 MASTER RESET

The master reset regi st er w il l for ce a CPU and sc ann er r ese t condi t ion on the falling edge of any of its listed inputs. The contents of the register wil l be latched at the ti me of reset such that when the CPU n ext comes out of reset the firmware can read the register to determi ne what caused the preceding reset and report the ap p rop ri ate co de to th e ho s t. If th e res e t was ca use by the CPU_RST_WR inpu t, th e sui cid e r ese t regi st er con ta in s the s pec ific err or code. If the reset was cause by the /SCAN_FAIL_ANY input, th e scanner reset register contains the specific error code.

The CPU and scanner resets will remain latched until the next rising edge of the RTS input. At this time the CPU reset wil l be cleare d if /PO WE R _ RES ET bit is not asserted and the scanner reset will be cleared if /SCAN_FAIL_ANY is high.

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2-56 System Overview PRODIGY Service Manual (Rev C - 2000)

Bit Name R/

0 /POWER_RESET R N/A MAX705 supervisor detects VCC < 4.65V. 1 /HOST_RTS R N/A RTS reset request from host via comm line. 2 /MANUAL_RESET R N/A Push button pressed. 3 Unused R N/A Expansion room, reads as ‘1’. 4 Unused R N/A Expansion room, reads as ‘1’. 5 Unused R N/A Expansion room, reads as ‘1’. 6 CPU_RST_WR R N/A Write to the suicide register, read suicide reg for error code. 7 /SCAN_FAIL_ANY R N/A Scanner reset register latched, read scanner reg for error code.

Def. Description

2.5.16 SUICIDE RESET

The CPU Reset SFR is a byte register into which th e CP U can write a failure code. In response to the wri te th e M AX PL D will store th e fa ilu re co de and assert the CPU_RE SET line. The CPU_RESET line will be released on the next rising edge of the host RTS, at whi c h time the CPU will be able to read the bit code from this SFR to determine the cause of the previous reset.

2.5.17 MISC OUT

The misc. output register is used to control the misc. output functions listed in the following table.

Bit Name R/

0 Unused N/A N/A Expansion room. 1 MAX DIAG_2 R/W 0 Firmware controlled diagnostic LED. 2 DMB HWPT R/W 0 Enable direct connect of host and DMB XCVR’s, bypassing

3 RESET OVERRIDE R/W 1 Enable override of CPU_RESET sign al. Set to 1 on po wer-up such

4 Unused N/A N/A Expansion room. 5 Unused N/A N/A Expansion room. 6 Unused N/A N/A Expansion room. 7 Unused N/A N/A Expansion room.

Def. Description

UART’s, for maximized scan data bandwidth DMB to host.

that firmware can load the FLEX PLD at power-up regardless of the host RTS state.

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-57

2.5.18 MISC IN

The misc. output register is used to control the misc input functions listed in the following table

Bit Name R/

0 BOOT JUMPER R N/A JP4, placed to force firmware to remain in boot code. 1 CPU_P1_2 R N/A Input from CPU port 1, pin 2 (diagnostic use only). 2 Unused N/A N/A Expansion room. 3 Unused N/A N/A Expansion room. 4 Unused N/A N/A Expansion room. 5 Unused N/A N/A Expansion room. 6 Unused N/A N/A Expansion room. 7 Unused N/A N/A Expansion room.

Def. Description

2.5.19 Stepper Motor Control

The stepper motors use the same interface desi gn as used on IQ and Prodigy. The FET exhibits a lower voltage drop and hence provides more available power at the drives for a given source voltage - e ssentially recovering the voltage lost in drop ping the D C supp ly fr om t he 26V u sed on IQ /Prod igy t o the 24V which is readil y available in commercial switchers. Diodes are placed in series on the Centent power lines to prevent back EMF generated when the arm is moved manu ally from reachin g th e 24 V pl anes and damagi ng the cSBC. A dual FET circuit is used to minimize the voltage drop on the 24V plane due to in-rush current when the motors are enabled. A circuit in the FLEX implements a 2 st ag e tur n on when t he fi r mwar e lo wers /mot o r_ena bl e. Q15 is enabled firs t to provide 24V to the Centents through R381 and R384, thus limiting the in-rush current. After the current pulse has stabilized Q14 is enabled to bypass the inrush limiting resistors. Q15 is then disabled and the motors are at full power. An PTC is provided on the source of Q15 such that the current limiting resistors will not be smoked if Q15 is inadvertently left enabled.

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2-58 System Overview PRODIGY Service Manual (Rev C - 2000)

2.5.20 OMI Input

The optical mot ion inte rru pt (OMI) sub-sys tem con nects to the transve rse an d longitudinal OMI CCA's. The OMI CCA's are located on the far end (the gear end farthest from the motor) of each drive axis. When the axis is in motion a small toothed wheel spins through the OMI opto's beam and pulses are sensed back on the cSBC. In this manner the system can sense a drive circuit, motor, or belt failure which might otherwise result is a concentrated exposure point during a patient scan. The OMI in puts are similar to those used on the DPX-IQ. 74LS14's are added for hysteresis which provides a clean direct int erface to the PLD. As on Prodigy, logic in the FLEX PLD is used to qualify the CH A and CH B inputs into a single 'valid motion' output. Based on the phases of the square wave inputs on CH's A&B , the FLEX is able to sense a change in direction. The circuit provides hysteresis to reject false motion inputs r esu lti ng fr o m scan ner vib r atio n wh en a whee l edg e st ops in the center of the opto beam at the end of a move.

2.5.21 Pati ent Positioners

Four optically isolated inputs are provided for patient positioning. These are used by the firmware to implement a joystick mode which is used in conjunction with the laser to position the X-ray beam as desired over the patient immediately prior to a scan. 74LS14 inverters are used to provide hysteresis and isolate the FLEX PLD inputs from the slow rise times of the opto output signals.

2.5.22 Limit Switches

Four optically isolated inputs are provided for limit switches. These are used by the firmware t o define the transverse and longitudinal table limits. 74LS14 inverters are use d to provid e hysteres is and isol ate the FL EX PLD inpu ts from the slow rise times of the opto output signal s.

2.5.23 X-ray Source Control / Mechanical Interlocks

The cSBC is designed such that a high on the scanner reset net disables all scanner functi onality and assures a know, fail safe, s tate. All scanner control outputs are driven by the FLEX PLD. The FLEX outputs drive the low side of a PS2501 opto coupl er emitter. The far side of all these opto circuits are configured such that the opto has to be energized for the scanner function to be active. As such the FLEX has to sink current to energize the opto and activate the desired scanner functi on. Internally the FLEX code defines these outputs as tri-st ate buffers, each of which has their enable line tied to the scanner reset net. As such a scanner reset wil l force all these FLEX scanner outputs to a high impedance state, de-energizing the opto's and di sabling the scanner.

The FLEX device is SRAM based and hence must be reprogr ammed by the CPU at power up. When the device is not programmed all I/O pins default to the high impedance state. As such the scanner will also be in a fail safe state when the FLEX is not progra mmed. The CPU po rt 1, pin 2 al so runs di rectly to the FLEX's ENABLE pin.

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-59

The cSBC provide a failsafe mechanism independent of the programmable logic via the +5V_IO circuit. If one or more of either the E-stop, external Estop, or tube thermostat is open, the FET driving the +5V_IO net from the +5VDC plane will be disabled. The +5V_IO net prov ides power to the emitter anode of all opto's w hic h dri ve c r itic al scan ne r fun ctio ns. As suc h t he s can ner will enter a failsafe state in response to these mechanical interlocks, even in the event of a PLD device failure. The +5V_IO FET will also be disabled by either a HOST_RTS or CPU_RESET.

2.5.24 Shutter / Collimator Drive

The shutter and colli mator solenoi d drive circuit s are the same as that used on Prodigy I. The FLEX dr ives an isolation opto which in turn switches a pair of FET's to control solenoid current. The f irst FET is used for an ini tial 'hard hit' on open commands. It p resents 24V directly to the solenoid for several hundred msec's, resulting in a large initial current pulse to the sol enoid. The second FET provi des t he 'ho ld' cu rrent throu gh a p air of curre nt l imit ing pow er resistors. The hold FET is tied directly to the /shutter_open_ctrl bit. Note that the collimator dr ive i s popul ated o nly for NT -A an d IQ upgrad es whic h use the old style IQ coll imator assembly. The nominal values of the power resistors is changed betwee n the NT and Prodigy II BOM's to support both t he traditional linear solenoi d of IQ, and the rotary solenoid of Prodigy. A jumper or DNP'd resistor is used to drive the IQ_SHUTTER line to the FLEX such that both mechanical an d op ti c al shut t er li mi t sw i tc h es are sup p ort ed .

2.5.25 End of Exposure Alarm

An on-board end of exposure alarm is provided. The alarm chosen is the board mount equiv alent of that used on Prodigy I.

2.5.26 Panel LED's

The 4 panel LED's, power on, X-ray on, source exposed, and laser on, are all driven PS2501-2 opto's through 750R0 / 1W current limiting resistors.

2.5.27 HVPS Cont rol

The HVPS analog control interface is designed to provide maximum performance at min imum cost. A single, 16 channel multiplexed, 16 bit, high accuracy, ADC is used in conjunction with several lower cost, lower bit resolution DA C's. Abso lute acc uracy of DAC's is poor but erro rs are ca librated out by the f i rmw are w hi ch mon ito rs t he ac tu al D AC ou tp ut v ia t he A DC. I n th is scenario DAC integral non-linearity (INL) specs are not important, sufficient differential non-linearity (DNL) is all that is required. Serial DAC's and ADC's are chosen to conserve board space and simplify routing. Serial parts are typically also lower cost as their maximum band width is limited by the serial baud rate.

The HVPS AC is enab led via a relay controlled by the cSBC. The line is primarially us ed to di sa ble the H VPS by r emov in g the A C to t he HVPS vi a the relay. AC Power to th e HVPS can be left on for up to one hour after generation of x-r ays to prevent AC cycling between concurrent scans.

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2-60 System Overview PRODIGY Service Manual (Rev C - 2000)

A jumper and/or DNP'd resistor pad is provide to drive the IQ_HVPS line, which the firmware reads to determine which HVPS it is intended to operate. The PWB provides lem o styl e conne ctor pa ds for us e with t he tra diti onal 0311/ 0312 HVPS and MAX CCA. For the 7681 HVPS the lemos are DNP'd and a single DB-25 connector is used to control the HVPS. Tranzorb pa ds are provide on the PWB and are expected to be populated only if deemed necessary by EMC t esting. A n opto bank is also provide d to suppor t the dig ital interface to the 7681. See Lunar dwg 7681-SP C for details.

2.5.28 ADC

The Burr Brown ADS8320 16 bit, serial, single channel ADC was chosen for the cSBC for its high resolution, and excellent accuracy.

An Analog devices AD 586 +5V voltage reference is used. The part was selected for it low noise and high accuracy

Overall the ADC and reference give the cSBC +/-5mV analog accuracy 11.2 DAC's

A single LTC1454 12 bit, serial, dual channel, DAC is used to provide the kV and mA program voltages. The part was chosen for it low cost, ready availability at nati onal distr ibutor s, and e xcell ent DNL speci fica tions. The DAC is used in the x2 configuration such that the full scale output is twice the reference voltag e . Voltage output s feed ba ck to th e ADC M UX su c h that firmware can calibrate out DAC INL errors.

A single LTC1661 10 bit, serial, dual channel, DAC is used to provide the arc threshold and f ilame nt cur rent l imit input volta ges t o the ne w 7681 HVPS. T he part was chosen for it low cost, ready availability at national distributors, and reasonable DNL specifications. Voltage outputs are not fed back to the ADC MUX as high accuracy is not required on these threshold inputs.

2.5.29 mA Low Range

To support future scan modes , an mA l ow r an ge ci rcui t is p rovi ded . Th e FLE X PLD provides a contr ol bit by which the firmware can switch the mA DAC reference volta ge from 2.048 V to 0.5V, hence decreasing the LSB si ze, hence allowing the firmware to take smaller voltage steps when ramping to low uA settings. A second control bit is provided to switch the ADC from 5.0 to 0.5V reference.

2.5.30 Detector Interface

The cSBC provides a RS-422 communications post to the Detector Mother Board. The CSBC does not participate in any Detector data manipulation, all analysis and Detector control is performed at the DMB.

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-61

2.5.31 Communications Ports Host RS-422 Port

The host I/O port provides optical isolation per medical leakage requirements of EN 60601-1-1, Annex BBB, section 7. QT's 6N136 opto's are used to provide the required 115.2KB operational band width and the required 2500 Vrms standoff at a reasonable price. Opto inputs and outputs are routed through the MAX PLD to suppor t th e hardwa re pass though mode to the DMB . A DB-9 female connector is provided on the host side of the isolation barrier. RS-232 is support ed by populating the XCVR U26. RS-422 is supported by U21 and U37, the RS-422 XCVR's. A simple charge pump circuit is used to generate +5V_ ISO on the host side of the barrier. Prodigy II will populate the RS-422 section and run at 115.2KB.

2.5.32 Debug RS-232 Port

The debug port is provided such that the firmware can echo status messages and other informat ion to a dumb ter minal to support debuggi ng, de velopm ent, testing, and servicing. The port is fu lly driven by a 16550 compatible UART is fully connected to a DB-9 header using the standard PC comm port pinout. The firmware can be configured to accept input from the debug port if required. The port is expected to be depopulated in the final product ion BOM to minimize cost.

2.5.33 Diagnostic LED's

16 diagnostic LED's are provided by the cSBC. Functionality is liste d below

LEDColor Function Description (status indicated when lit)

D13 Green +24V +24V DC input from supply present. D14 Green +12V +12V DC input from supply present. D15 Green -12V -12V DC input from supply present. D7 Gre en +5V +5V DC input from supply present. D16 Red FLEX CONFIG FLEX PLD not programmed. D20 Red CPU RESET CPU in reset mode. D19 Red SCANNER RESET Scanner in reset (failsafe) mode. D27 Red AGS ROLL AGS roll over or under detected. D29 Amber FLEX DIAG 1 Diagnostic LED for misc use by firmware, control reg in FLEX. D31 Amber FLEX DIAG 2 Diagnostic LED for misc use by firmware, control reg in FLEX. D22 Amber MAX DIAG 2 Diagnostic LED for misc use by firmware, control reg in MAX. D28 Amber TRANS OMI Valid transverse motion sensed by OMI circuitry.

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2-62 System Overview PRODIGY Service Manual (Rev C - 2000)

D22 Amber LONG OMI Valid longitudinal motion sensed by OMI circuitry. D25 Amber HE COUNT Valid high energy photon event sensed by DCA circuitry. D23 Amber LE COUNT Valid low energy photon event sensed by DCA circuitry. D21 Amber HVPS ENABLE 7681 HVPS enabled.

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-63

2.6 Power Distribution (PRODIGY II Systems DF+1200 and grea te r)

The PRODIGY II system r educes scann er cost by using a sin gle switc hing DC power supply which provide s +5,+/-12, and +24VDC. T he suppl y is connec ted directly to the cSBC via J14. J13 is provided as a power out connector to run power to the DMB for Prodigy II. 0R0 bypass resistor are provided to allow flexibility in grounding and filtering schemes. The PWB is divided into 4 ground plane regio ns - DGND fo r +5V digita l returns , AGND for +/-12 V analog returns, SCNGND for +24V returns, and ISO_GND for the host I/O island. Large zeners and rectifiers are provided for over-voltage and reverse-voltage protection. Standard capacitor filter banks are provided. For EMC all cable exits other tha n host and DMB I/O are located over the 24V planes. The 24V plane is separated from the 5V plane via optical isolation to prevent 5V noise from reaching cables (radiated EMC) and to pre v ent motor noise and ESD pulses from reaching the digital and analog IC's. The 24V plane contains primarily power FET switches and power resistors used to control scanner motors, X-ray source, LED, et c. The +/-12 V planes con tain analog ele ctroni cs used for detector and HVPS control. A +12V r egulator is used to produce 12VDC for the Centent drives of off +24VDC, maintaining isolation from the +12V plane. An addi tional +5V regulator is us ed to make 5V for the OMI's of off +12V mo tor s. 4 opto cha nne ls are use d t o sens e the pr e sen ce of th e 4 DC input voltages. The opto outputs are used to drive 4 gree n power on indicator LED's and to allow t he CPU to detect power outs.

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2-64 System Overview PRODIGY Service Manual (Rev C - 2000)

2.7 Tube Head and X-ray Insert

The Tub e Head consists of an oil-filled metal housing which contains a fixedanode X-ray Insert (essentially a vacuum tube diode), lead-type shielding, collimating devices, a filament transformer, electrical connectors, and a Cerium (K-edge) filter.

THe X-ray genera tor provides a constant 76kV potential. mA control circuit regulates the fialment current via filament temperature to amintain the programmed current emission. The X-ray generator only provides mA monitor and mA limiting. PRODIGY I systems (DF+11999 and lower) have MAX CCA, PRODIGY II systems (DF+12000 and greater have mA c ontrol internal to the x-ray generator.

2.7.1 X-ray generation and Spectrum

• The X-ray Insert converts current into x-rays by accelerating the electrons acros s a l ar ge pot en ti al fr om t he ca th od e int o a t un gst en tar ge t on the anode.

• The x-rays produced by the x-ray insert are filtered by the cerium filter to produce a dual energy spectrum. The x-ray spectrum has peaks at 62 and 38 kV.

• Insert potential is provided by a/the High Voltage Power Supply(ies).

• The tube current is set by the (c)SBC at 0.15 mA or 3.00 mA depending on the acquisition type.

• Tube Current is set by the (c)SBC and regulated by the MAX Board (PRODIGY I) or the Power Supply (PRODIGY II systems).

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-65

2.8 X-ray Generator (High V oltage Power Supply(ies))

The PRODIGY X-ray production system combines a constant potential x-ray generator (cons isting of either one or two high vo ltage po wer suppli es) and an X-ray tube. The x-rya generator provides a continuous output of 38 kV each and up to 5 mA (PRODIGY I) or 3.5 mA (PRODIGY II) to the X-ra y tube. The x-ray insert anod e is composed of a tungsten alloy. The specifications of the X-ray generation subsystem is outlined in sect ion 2.16.7.

• The High Voltage Powe r Supp ly(ies) provide the an ode/cat hode pot ential to the X-ray insert.

• PRODIGY I scanners use two high-voltage power supplies (±40kVDC). During normal op eration, 76kVp is applied (+38kV at the anode and 38kV at the cathode).

• PRODIGY II scanner s use a single high-voltage power supply (±40kVDC). During normal operation, 76kVp is applied (+38kV at the anode and -38kV at the cathode).

• The High Voltage Power Supplies are controlled by the (c)SBC.

• These power suppli es are powered by t he AC li ne vol tage and h ave the ir own built in fusing.

• The AC power is routed thru the isolation transformer (PRODIGY I Only) and the supply(ies) are enabled via a relay (see sect ion 2.1.1).

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2-66 System Overview PRODIGY Service Manual (Rev C - 2000)

2.9 MAX Board (PRODIGY I systems DF+11999 and lower only)

2.9.1 MAX Board Function

• The Tube Head and MAX Board work with the dedicated +28VDC power supply to supply tube head current.

• The current is set by the SBC (see section 2.4).

• MAX board actuall y regulates current to the f ilament transformer in the Tube Head.

2.9.2 Dedicated +28VDC power supply

• The +28 VDC dedicated power supply is switched on (for fail-safe purposes) by a solid-s tate relay.

• When errors are detected by the SBC, (for example, loss of arm motion) the relay will switch off and prevent production of x-rays.

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-67

2.10 XORB Board (PRODIGY I Systems DF+11999 and lower only)

The XORB printed cir c uit board provides protect ion to various circuits (low voltage) from tr ansients within the HVPS and tube head (see 2.1.1 for location).

• There may be occasional static discharges within the Tube Head. The transients caused by these static discharg es (arcs) are shunted to ground through the array of transorbs present on the XORB board.

• There is no safety ha zard to pers onnel, howeve r , the elect ronics coul d be damaged were no protection provided.

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2-68 System Overview PRODIGY Service Manual (Rev C - 2000)

2.11 Detector Sub System

2.11.1 Detector Overview

• 16 individual CZT (cadmium zinc telluride) crystals which convert X-ray energy directly to electrical charge

• The charge pulse generated by the individ ual detectors is directl y proportional to the photon energy that generated the charge pulse (see

2.16.9 for spect rum information).

• The array of 16 CZT crystals each act as pixel detectors, from which the data is combined to f orm the densitometry data se t.

• The Detector elec tronics amp lify , discrimin ate and counts x- rays for all 16 detector eleme n t s.

• The detector communicates with the SBC.

• The Detector has 5 PCB associated with it, the Detector Mother Board (DMB) and 4 identic al Detector Daughter Boards (DDB’s).

• The detector h as its o wn dedi cate d H igh Voltage Powe r Supp ly, used for supplying detector bias.

2.11.2 Detector Operation

Figure 2-15. Detector Block Diagram

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-69

The Detector is held at 450 VDC bias. When a X-ray strikes the detector an electron pair is cr eated (sm all bl ack arrows i n the blo ck diagra m). Th is charge pair induces a small amount of current in th e CZ T crystal.

A charge sensitive pre-amp then converts the current to voltage and passes the signal along to the Detector Daughter Board for processing and analysis. The signal out of the pre-amp i s a +5 to +10 mil livolt DC sign al, each ev ent on each channel creates a small “blip”.

2.11.3 Detector Daughter Board Overview

• Each DDB processes the data from 4 of the 16 detector elements simultaneously.

• Each detector element is handled as a separate channel.

• Each DDB is respo nsible for:

• Pulse Shaping

• Gain Adjust

• Energy discrimination (high or low energy)

• Event counting

• Each DDB is electronically identical

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2-70 System Overview PRODIGY Service Manual (Rev C - 2000)

Figure 2-16. Detector Daughter Board Operation

2.11.4 Detector Daughter Board Operation

Gain Stage / Pulse Shaping

The Detector Daughter Board takes the +5 to 10 millivolt signal, strips off the DC offset and shapes the pulse into a bi-p olar pulse. This signal is further amplified to 2.4 VDC and is then fed to a bank of 4 pair s of comparators.

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-71

The four fine gain co ntrol comparators are set up in two windows around the High Energy signal. If the signal falls into the lower window a signal is sent to the programmable logic (PLD). The PLD then sends an amplify signal to a DAC which in turn increases gain slightly at the pulse shaping amplifier, so that the High Energy Signal is +2.4 VDC. If the High Energy signal fall s into the upper window, the fine gain is adjusted down slightly by the same mechanism at the pulse shaping amplifier, again so that the High Energy Signal is + 2.4 VDC.

The fine gain adju st is applied to the entire signal on a particular channel at the pulse shaping amplifier, therefore the Low Energy Signal’s gain is adjusted along with the High Energy Signal.

The 4 comparators of the Gain Stage are set by digital to analog converters (DAC’s) which use reference values stored in the Flash RAM of the Detector Mother Board.

Energy Discrimination an d Pulse Counting

The amplifie d and g ain a djust ed p ul se is simul t ane ously f ed t o a sec ond b ank of 4 comparators wh ich are divided again into two sets of windows. The windows of the Discrimination stage are centered around the High and Low Energy pulses. These com parators are also se t by DAC’ s whic h are set by the DMB Flash RAM.

Each time a pulse falls into the High Energy window, a counter in the programmable logic (PLD) is ticked, the same h appens for the Low Energy window. These two data si gnal s ar e then pa ssed t o the D MB, w hi ch tra nsmi ts the data to the SBC.

2.11.5 Detector Mother Board Overview

• Contains 4 slot s for the DDB’s (see figure 2-9)

• Contains a slo t for the Test Point Board (part of the PRODI GY tool ki t see figure 2-9)

• The Detector Mother Board provides +5 V, ±12 V plus digital and analog grounds to the Detector Daughter Boards.

• The Detector Mother Board communicate s with the SBC via RS-422 link.

• The patient positioning laser is controlled by the SBC via the DMB (See figure 2-9).

2.11.6 Detector Mother Board Operation

The Detector Mother Board (DMB) contains a processor and Flash RAM, which supplies programming data to the detector subsystem. The data for all comparator settings is stored here (set values), detector Bias programming data, firmware to prog ram th e PL D’s of the 4 DDB’s, the Peak va lu e calculation operation for the detec tor (see section 2.17 for a discussion of the Secondary Calibration (QA)).

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2-72 System Overview PRODIGY Service Manual (Rev C - 2000)

If the Flash RAM i s c orr upt , t he DMB w i ll r ea d f rom t he Fi rmw are on th e S BC. The Flash RAM can be reprogrammed from the Host / SBC.

The DMB has a processor, which is responsible for performi ng the Peak calculation dur ing a Secondary Calibration (QA), programming the 4 DDB PLD’s and handles all communications wit h the SBC. The DMB processor sends the SBC stat us rep or ts an d e cho es b ack all co mman ds tha t are se nt to it.

The DMB will reset the SBC if it detects an error. Error Conditions of the DMB sensed by the SBC:

• PLD programming failure

• Loss of +5 or +12 VDC

• Loss of Communications with SBC

• Corrupt FIRMWARE

•FLASH RAM Failure

• DTR Reset button on the DMB is pressed

Figure 2-17. PRODIGY Detector Module

1 = Test Point Board, 2 = Detector Daughter Boards (4), 3 = Patient Positioning laser and

Detector Mother B oa rd I nt erf ace, T he De te ct or Mot he r Bo ar d i s t he hor i zon tal ci r cui t boa r d

that the DMB’s and Test Point Board are plug ged into.

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-73

2.12 FOINK (PRODIGY I Systems DF+11999 and lower only)

2.12.1 FOINK Functions

• The FOINK Board optically isolates contr ol circuitry (SBC) from the rest of the scanners electronics (see pan layout Appendix 2B).

• Shutter solenoid

• Scanner Motor Controllers

• Display Panel indicators and controls

• Monitors 5 different interrupts, all of which are capable of resetting the SBC (shutting down x-ray production)

• Emergency Stop Switch - open circuit - (loss of signal - failsafe)

• Tube Head Thermocouple - circuit open (loss of signal - failsafe)

• Longitudinal Motion Interrupt - source open no movement (OMI)

• Transverse Motion Interrupt - source open no movement (OMI)

• Failure of the +28 VDC Power Supply

2.12.2 Motion Control and Detection

• Motor pulses, RUN/HOLD signals and direction are generated by the SBC.

• The RUN/HOLD signals are optically isolated on the FOINK board before being sent to the Centent motor drivers. Th e Centents supply current to the stepper motor windings.

• Both the transverse and longitudinal drive systems have slotted disks attached which pass through optical interrupters (OMI) for motion detection. Sho uld mo ti on st op d uri ng p atie nt sca nni ng , the FOI NK s end s an interrupt to the SBC, which is reset and x-ray production is halted.

• Limit switch es at e ach e nd of the s canner and each end of the arm si gnal the SBC whenever motion reaches either end or side of the scanner. If a limit switch is tri pped during a patient scan, the mot or associ ated with the tripped limit switch is halted, the SBC is reset and the shutter is closed.

• There is a dedicated DC power supply for the motion control circuitry , supplying +26VDC. The +26VDC ground is isolated from the logic ground to reduce noise (see section 2.1.1 for location)

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2-74 System Overview PRODIGY Service Manual (Rev C - 2000)

2.13 Display Panel

• The Display Panel of the PRODIGY, located on the front face of the upper arm, is the main operator interface outside the host computer.

• Four indicator s display system status.

• A green Light E mitt in g Diod e ( L ED) i nd ic at es a power- o n c ond iti on; i t lights when the +26VDC power supply comes on.

Figure 2-18. PRODIGY display panel

Power on LED is lit whenever scan table power is on.

• A yellow LED indicates if the laser is on

The laser on LED is lit when the SBC signals the DM B to turn the laser on, the LED is swi tc h ed on by the DMB.

• An amber X-ray On LED indicat es that x-rays are being produced (current is flowing through the X-ray Insert), though exposure is not necessarily taking place.

The X-ray on LED is lit when more than X current is flowing through the X-ray insert.

• The yellow Shutter Open LED comes on is the Shutter open and exposure possibl e.

The Shutter open LED is controlled by the SBC, the SBC will allow the shutter to open even if the lamp is no t lit (shutter open indicator is also on the PC controller screen).

Note: It is not recommended that scanner operation be continued if

These LED's signal the operator of exposure to x-rays and must be replaced as soon as possible.

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-75

• Rocker switches on the panel allow operator control of the beam position.

The Rocker switches are enabled by the SBC via the FOI NK.

Note: The rocker switches are also referred to as the joystick in the

PRODIGY Service Manual and the PRODIGY Service Software.

• The Emergency stop button (red), is to be used on ly in emergency situations; it resets the (c)SBC and halts x-ray production.

The FOINK or cSBC detects if this normally closed circuit is opened (fail-safe operation).

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2-76 System Overview PRODIGY Service Manual (Rev C - 2000)

2.14 Audible X-RAY OFF Signal

• An audible signal notifies the operator that there is a “safe” condition when the Shutter is cl os e d.

• The FOINK or cSBC board senses the closure of t he Shutter or the cessation of current through the X-ray Insert (+28VDC Power Supply or Model 7861 HVPS) and switches on the audible signal if either of these occur during an expo sure.

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PRODIGY Service Manual (Rev C - 2000) System Overview 2-77

2.15 X-Ray Collimator Subsystem

• The Shutter i s actuated by a rotary solenoid using +26 VDC, the voltage is reduced to a holdi ng voltage of 12VDC after the shutter is opened.

• This solenoid i s controlled by signals generated on the SBC, and optically isolated through the FOINK bo ard on PRODIGY I systems.

• An optical interrupter (OMI) detects the shutter open condition and reports shutter position information back to the (c)SBC.

• This assembly is located on top of the X-ray Tube Head.

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2-78 System Overview PRODIGY Service Manual (Rev C - 2000)

2.16 PRODIGY Specifications

2.16.1 Component specifications

Table 2-3 give s specifications for standard components shipped with the PRODIGY system.

Table 2-3. PRODIG Y Component Specifications

Component Specifications

Dimensions: 262.3 cm x 109.3 cm x 128.3 cm

Scanner table*

Console table 78.5 cm x 63.3 cm x 48.1 cm

Computer

Windows

Internet Explorer version 4.01 with service pack 2 Fast Serial I/O board (L U NAR pa rt nu mb er 71 5 1)

Weight: ap proximately 272.16 kg

Maximum patient weight supported: 136 kg

Greater than 266 Mhz Pentium

128 MB RAM

Greater than 1GB hard disk

17” SVGA monitor (800x600x16-bit color)

LS-120 Super drive

CD ROM

Modem

NT version 4.0 operating system with servi c e

pack 6

Printer

W x D x H—44.0 x 40.0 x 19.6 cm

*Depth is measured from the front edge of the scanner table to the back edge of the scanner arm. Height is measured from the top of the scanner arm to the bottom of the scanner arm.

*Width is measured from the front edge of the scanner table to the back edge of the scanner arm. Height is measured from the top of the scanner arm to the bottom of the scanner arm.

#Some languages may require 1024x768x16-bit color to fit the translated software text on the screen

@GE-LUNAR Recommends Diskeeper Lite (Executive Software - http:// www.execsoft.com - Glendale, California, USA)

HP DeskJet 930C

2.16.2 Functional specifications

General specifications

Focal spot to image receptor distance is 67 cm. Attenuation equivalence of patient suppor t table is 0.7 mm Al.

2.16.3 Maximum scan area (long x transverse)

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-79

• AP Spine Measurements

40.3 cm x 18 cm

• Femur Measurements

20.2 cm x 18 cm

• Dual Femur Measurements

20.2 cm x 18 cm (each femur - two scan areas)

• Total Body Measurements

197.5 cm x 60 cm measurement field

2.16.4 Programs

Note: Depending on the number of options purchased, not all of the

options listed below may be included with the PRODIGY system software:

• AP spine measurement and analysis

• Femur measurement and analysis

• Total Body measurement and analysis.

• Forearm measurement and analysis

• Lateral spine measurement and analysis

• Quality Assurance

2.16.5 Environmental specifications

Operational envir onment

Adhere to the spec ifications that follow during scanner operation:

••Ambient Space (Interior Subcomponents)–For scanner operation and servicing, do no t block t he area ar ound the scan ner tab le. Make sur e there is a minimum cle arance of 30. 5 cm at the hea d and foot ends of the scanner table, at le ast 15.2 cm for the arm side, and 45. 7 cm for the operator side.

• Ambient Space (Ventilation)–Do not block the cooling vents on the computer and scanne r table. Make sure there is 15.2 cm from the console table to the wall for cable clearance and computer plugs.

• Dust, Fumes and Debris–Install the system in a clean, ventilated area. Dust and other airborne debris can cause the di skette drive heads and other sensitive mechanical components to malfu nction. GE-LUNAR recommends that smoking is not permitted in the scanner room.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-80 System Overview PRODIGY Service Manual (Rev C - 2000)

• Humidity–Make sure the humidity for the scanner area is 20%–80%, non-condensing.

• Static Electricity–Install and operate the system in a static-free area. Adhere to minimum hu midity requirements to pr event malfunctions caused by static electricity.

• Shock and Vibration–Make sure the scanner table does not receive shock greater than 1 G for more than 1 millisecond. Make sure the scanner table does not receive vibrations greater than 0.25 G at 5 Hz.

• Temperature–Make sure t he temperature during system operation is 65°F–81°F (18°C–27°C).

Note: When the system is turned off, or there is a power failure,

allow the system to be on and let it warm for one hour. After one hour, complete a Quality Assurance procedure.

2.16.6 Storage and transport environment

Adhere to the spec ifications that follow for scanner storage and transportation:

• Humidity, 0% to 95% non-condensing.

• Atmospheric pressure, 500 to 1060 hPa.

• Temperature, -40° to 70° C.

2.16.7 X-ray generator (system no. DF+12000 and higher)

Table 2-4. X-ray generator technical information.

Classification Class I Equipment IEC 601-2-7 5.1

Degree of protection against electrical

shock

Protection agai nst ingress of liquids

Connection to s upply mains Power supply cord IEC 601-2-7 6.1g)

Mode of operation Continuous IEC 601-2-7 6.1m)

Maximum X-ray tube voltage 76 kV IEC 601-2-7 6.1m)

Maximum X-ray tube current 3 mA IEC 601-2-7 6.1m)

Rated mains voltage 100-240 VAC IEC 601-2-7 6.1j)1

Type B equipment IEC 601-2-7 5.2

Ordinary medical electrical equip-

ment

IEC 601-2-7 5.3

Number of phases in mains 1 IEC 601-2-7 6.1j)2

Mains frequency 50/60 Hertz IEC 601-2-7 6.1j)3

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-81

Required over-current releases 15 Amp dedicated service IEC 601-2-7 6.1j)5

X-ray tube dissipates 243W max.

into surrounding air through forced

Heat dissipative components

air convection. Flow rate: 36 m

IEC 601-2-7 6.1 t)

(approx.) Temp. rise of air stream

25° C (approx.)

Allowable high vo lta ge supplies

Spellman SBD40PN280X2890 or

Bertan 2907.

Allowable tube head assemblies LUNAR model 8743 or equivalent

Original language of accompanying docu-

ments

Maximum continuous kV, mA at nominal

rated kV

Maximum intermittent kV, mA at nominal

rated kV

Maximum continuous kV, mA at maximum

Maximum intermitten t kV , mA at maximum

Continuous kV, mA for maximum electric

output power

Intermittent kV, mA for maximum electr ic

output power

English IEC 601-2-7 6.8.1

76 kV, 3 mA

IEC 601-2-7 6. 8.1 and 50.2.101-102

IEC 601-2-7 6. 8.2

Nominal electric power 0.243 kW

0.20 mAs. Parameters: 76 kV, 0.10

Lowest curren t tim e pr od uc t

mA,

2 seconds.

Nominal shortest irradiation times 2 seconds.

Method of x-ray tube voltage measure-

ment

Method of x-ray tube current measure-

ment

V oltage divider in high voltage

power

supply.

Shunt resistor in hi gh voltage suppl y

return line.

Line normal to the tube port, cen-

X-ray tube assembly reference axis

tered

on tube port as shown in Figure 4.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

IEC 601-2-7 6. 8.2

IEC 601-2-7

50.106.1

IEC 601-2-7

50.106.2

IEC 601-2-7

6.1j)5) 50.107.1

2-82 System Overview PRODIGY Service Manual (Rev C - 2000)

Reference loading conditions

8.21 x 10

Joules, 3 mA, 76 kV for 1

hour.

IEC 601-1-3

29.204.2

Focal spot to Image Receptor distance 67 cm

Attenuation equivalence of patient support

table.

0.7 mm Al

2.16.8 X-ray generator (system no. DF+11999 and lower)

Table 2-5. Table 4. X-ray generator technical information.

Classification Class I Equipment IEC 601-2-7 5.1

Degree of protection against electrical

shock

Protection agai nst ingress of liquids

Ordinary medical electrical equip-

Connection to s upply mains Power supply cord IEC 601-2-7 6.1g )

Mode of operation Continuous IEC 601-2-7 6.1m)

Maximum X-ray tube voltage 76 kV IEC 601-2-7 6.1m)

Type B equipment IEC 601-2-7 5.2

ment

IEC 601-1-3

29.203.2

IEC 601-1-3

29.206.2

IEC 601-2-7 5.3

Maximum X-ray tube current 5 mA IEC 601-2-7 6.1m)

Rated mains voltage

100, 110, 115, 120, 125, 127, 200,

220, 230, 240, 250, and 254 volts

IEC 601-2-7 6.1j)1

Number of phases in mains 1 IEC 601-2-7 6.1j)2

Mains frequency 50/60 Hertz IEC 601-2-7 6.1j)3

Required over-current releases 20 Amp dedicated service IEC 601-2-7 6.1j)5

X-ray tube dissipates 305W max.

into surrounding air through forced

Heat dissipative components

air convection. Flow rate: 36 m

IEC 601-2-7 6.1t)

(approx.) Temp. rise of air stream

25° C (approx.)

Spellman X2112/X2113/ rev. K and

Allowable high vo lta ge supplies

higher. Bertan 2411P and 2411N

rev. A and

higher. LUNAR p/n 0311 and 0312.

Allowable tube head assemblies LUNAR model 6838 or equivalent

Original language of accompanying docu-

ments

English IEC 601-2-7 6.8.1

IEC 601-2-7 6.8.1 and 50.2.101-102

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-83

Maximum continuous kV, mA at nominal

rated kV

76 kV, 4 mA

IEC 601-2-7 6. 8.2

Maximum intermitten t kV , mA at maximum

Maximum continuous kV, mA at maximum

Maximum intermitten t kV , mA at maximum

Continuous kV, mA for maximum electric

output power

Intermittent kV, mA for maximum electr ic

output power

76 kV, 5 mA

61 kV, 5 mA

76 kV, 5 mA

76 kV, 4 mA

76 kV, 5 mA

Nominal elec tri c power 0.4 kW

7.89 mAs. Parameters: 76 kV, 2.63

Reference current time product

3 seconds.

Nominal shortest irradiation times 3 seconds.

No specific wait period was

Repetition rate for loading during tests

Time between tests was approxi-

20 seconds.

mA,

imposed.

mately

IEC 601-2-7 6. 8.2

IEC 601-2-7

50.104.4

Method of x-ray tube voltage measure-

ment

Method of x-ray tube current measure-

ment

X-ray tube assembly reference axis

Reference loading conditions

Leakage radiation was measured at the

following load ing factors.

V oltage divider in high voltage

power supply.

Shunt resistor in hi gh voltage suppl y

return line.

Line normal to the tube port, cen-

tered

on tube port as shown in Figure 4.

1.09 x 10

Joules, 4 mA, 76 kV for 1

hour.

3mA, 76 kV IEC 601-1-3

IEC 601-2-7

50.106.1

IEC 601-2-7

50.106.2

IEC 601-2-7

6.1j)5) 50.107.1

IEC 601-1-3

Focal spot to Image Recepto r distance 67 cm IEC 601-1- 3

Attenuation equivalence of patient

support table.

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

0.7 mm Al IEC 601-1-3

2-84 System Overview PRODIGY Service Manual (Rev C - 2000)

Figure 2-19. Ref e rence axis and target angles for tube head assembly

2.16.9 GE-LUNAR 8022 x-ray tube

Table 2-6. LUNAR 8022 X-ray tube technical information.

Nominal anode input power 361 Watts IEC 613/1989

Maximum anode heat co ntent 6000 Joules IEC 613/1989

Anode heating and cooling curves Refer to figure 5. IEC 613/1989

Anode target material Tungsten IEC 601-2-28

Reference axis Refer to figure 4. IEC 601-2-28

Target angle

78° (reference to nor-

mal)

IEC 601-2-28

Nominal focal spot values 0.5 IEC 336/1982

Maximum useful voltage 95 kVp

Maximum filament current 2.2 Amperes

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

Not Applica-

ble

Not Applica-

ble

PRODIGY Service Manual (Rev C - 2000) System Overview 2-85

Figure 2-20. Anode heating/cooling curves

2.16.10 GE-LUNAR 8743 x-ray tube head assembly (system no. DF+12000 and higher)

• Beam filtration is permanently fixed with a minimum 2.9 mm Aluminumequivalent.

Table 2-7. LUNAR 8743 x-ray tube assembly technical information.

Inherent filtr ation >2.9 mm Al/70 kV

Filament characteristics Refer to Figure 6.

Nominal x-ray tube voltage

Single load rating 228 W (3 mA, 76 kV) for up to 15 min.

Serial load rating

Maximum x-ray tube assembly heat con-

tent

X-ray tube assembl y heating and cooling

curves

76 kV - Anode to Cathode

38 kV - Anode to Earth

38 kV - Cathode to Ea rth

228 W (3 mA, 76 kV) for up to 15 mi n.

with a

5 min. cool down time between mea-

surements.

260 Kjoules

Refer to Figure 7.

IEC 522/

1976

IEC 613/

1989

IEC 613/

1989

IEC 613/

1989

IEC 613/

1989

IEC 613/

1989

IEC 613/

1989

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-86 System Overview PRODIGY Service Manual (Rev C - 2000)

Maximum continuous hea t dissipation

243 Wat ts (3mA x 76kV + 15W fila-

ment)

IEC 613/

1989

Maximum symmetrical radiation field

3.5 mm/19.4 mm at a dis ta nc e from the focal spot of 220 mm.

Dimensions 17 cm x 19.4 cm x 11 cm

Weight 8.6 kg

2.16.11 LUNAR 6838 x-ray tube head assembly (system no. DF+11999 and lower)

• Beam filtration is permanently fixed with a minimum 2.9 mm Aluminumequivalent.

Note: Beam qua lity has a m inimum fi rst half -value layer of 3 .2 mm of

Al at 76 kV.

Table 2-8. LUNAR 6838 x-ray tube assembly technical information.

Inherent filtr ation >2.9 mm Al/70 kV IEC 522/1976

Filament characteristics Refer to Figure 6. IEC 613/1989

IEC 806/

1984

IEC 601-2-

76 kV - Anode to Cathode

Nominal x-ray tube voltage

38 kV - Anode to Earth

IEC 613/1989

38 kV - Cathode to Ea rth

361 W (4.75 mA, 76 kV) for up to 4

Single load rating

min.,

IEC 613/1989

59 sec.

361 W (4.75 mA, 76 kV) for up to 4

Serial load rating

min.,

59 sec. with a 10 min. cool down

IEC 613/1989

time between measurements.

Maximum x-ray tube assembly heat con-

tent

X-ray tube assembly heating and cooling

curves

260 kJoules IEC 613/1989

Refer to Figure 7. IEC 613/1989

Maximum continuous heat dissipation 361 Wat ts IEC 613/1989

Maximum symmetrical radiation field

3.5 mm/19.4 mm at a di st an ce fr o m the focal spot of 220 mm.

IEC 806/1984

Dimensions 17 cm x 19.4 cm x 11 cm IEC 601-2-28

Weight 8.6 kg IEC 601-2-28

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-87

Figure 2-21. Cathode emission characteristics

Figure 2-22. X-r ay tube assembly heating/cooling curves

2.16.12 Laser specifications

Table 3-9 gives the specifications for the GE-LUNAR laser.

Table 2-9. Laser specifications.

Output Power <1mW

Wavelength 635nm

Beam Diameter at

aperture

4x1mm

Aspect Ratio 4.0 to 1

Divergence 24 degrees

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-88 System Overview PRODIGY Service Manual (Rev C - 2000)

Table 2-9. Laser specifications. (continued)

Radiant Exposure 0.0001 W

Integrated Radiance 46 W

Current Draw 105 mA

Voltage Input 4-6 VDC

Safety Rating Class II

2.16.13 Compatible compon ents

For customers located internationally, make sure the computer is certified to local requirements. The computer must meet the minimum requirements that follow:

• Greater than 266MHz Pentium

• 128 MB RAM

• Greater than 1 GB Hard Disk

• 8X CD ROM

• 14” SVGA monitor with at least 800x600x16-bit color

• Windows NT version 4.0 operating system with service pack

• Internet Explorer version 4.01 with service pack 2

2.16.14 FDA Certified Components (USA Only)

Tables 2-9 and 2-10 list components certified to the FDA for use with PRODIGY scanners and is updated periodically. Contact GE-LUNAR for a current listing of compatible components.

Table 2-10. FDA certified components (system no. DF+12000 and higher).

Component Description

X-ray Controll er LUNAR single board controller 7635

High Voltage Power

Supplies

Bertan

SBD40PN280X2890

Tube Head Assembly LUNAR X-Ray Tube Head Assembly 8743

Collimator

LUNAR PRODIGY Collimator Assem-

Model: 2907

Spellman

bly

Model:

LUNAR Model

7681 7681

8915

Bertan High Voltage Corp., 121 New South Road, Hicksville, NY

Spellman High Voltage Electron ics Corp., 475 Wireless Boulevard, Hauppauge, NY

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-89

Table 2-11. FDA certified components (system no. DF+11999 and lower).

Component Description LUNAR Model #

X-ray Controller

High Voltage Power

Supplies

LUNAR PRODIGY single board con-

troller

Spellman

Models:

PTV40N200X2113 PTV40P200X2112

Bertan

Models:

2411 N 2411 P

5447

0311 0312

Tube Head Assembly LUNAR X-Ray Tube Head Assembly 6838

Collimator

Spellman High Voltage Electronics Corporation Ha uppauge, NY

Bertan Associates, 121 New South Road, Hicksville, NY

LUNAR PRODIGY Collimator Assem-

bly

6893

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-90 System Overview PRODIGY Service Manual (Rev C - 2000)

2.17 Secondary Calibration / Daily QA

2.17.1 Secondary Calibration overview

• Daily QA (Quality Assurance) tests the integrity of the scanner so operator knows it is operating within specifications.

• Daily QA (Secondar y Calibrati on) adjusts t he calibrat ion of the s canner to offset any cha nges due to the tube aging, temperature varying, or when certain components ar e changed.

• A third type of function, QC Phantom, is another method for testing system performanc e. A QC pha ntom is scann ed usi ng st andard soft ware and results are stored (aluminum spine in luci te).

• Daily QA ensures the system is operating properly by running 3 types of tests:

• A peak test to adjust ph oton counting electronics.

• A functional test that checks the indicator lights, motion system, shutter, tube output, and detector performance.

• A test that measures a secondary calibration object with different bone chambers and tissue plugs which correct for system aging and prevents long-te r m dri fts .

• On many tests, the results must be calculated for all 16 detectors separately. The display for the test will consist of the mean value.

• All tests are ru n all of the time. The tests ar e executed and test results reported as each test completes. Test results include pass/fail and any quantitative information when appropriate.

2.17.2 Starting the Daily QA (secondary calibration)

Operator presses [F5] to st art [Dai ly QA] whi ch presen ts a plot of the last used parameter from the last Daily QA run. (Default display is the medium bone chamber.) At this point operator can interactively manipulate the data in QA database to create tables and graphs that can be prin te d.

Tech presses [Start] to start running Daily QA tests. Software displa ys in structions to pos iti o n ca li bration block on the ta bl e. Tech

places block on tabletop silk screen and click [ OK] to start. The UI locks out all ot her operations except Stop button. Scan arm moves to the "Home" position. In this case, Home is always at head

of scanner for QA independent of user setting for Home.

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-91

2.17.3 Tests Performed in the Secondary Calibration Detector Mother Board Self Test

The DACs and Flash RAM of the Detector Mother Board are tested.

Find Block

The scanner perform s a scout scan to find the block. If block is not properly positioned, the scanner will prompt the user to Reposition standard more accurately.

The software automatically finds landmarks within the secondary phantom. This reduces the need for exact positioning on the table top.

Peak Test

During this test, the shutter opens with the x-rays on. This test adjusts the sensitivity of the photon counting electronics. The test

determines the optimal voltage setting for the detector amplifier so the maximum number of phot ons are detec ted. With the shutter open th e software adjusts the volt age setting for the detector amplifier, acquiring counts at the different amplifie r settings.

The detector peak test then determines the optimal voltage setti ng for the detector amplif iers bas ed on t he resul ts. T he actual peak se tting i s take n from the high energy count rates, the low energy channel is essentially blocked by the brass spillover piece in the QA standard.

Beam Stop test

Measures the movement of the source shutter. A functional test checks the shutter LSW and ensures the shutter stops al l photons.

Motor motion and limit switches

OMI Interrupt function - the OMI signal is tested by verifying the OMI Interpol signal is present when the scan arm is stationary.

Each motor (tran svers e, longi tudi nal) w ill be run b etwe en hard limi ts and back to home position. If the hard limits do not engage, this is a failure. Also compare steps against predetermined scan window size.

If a failure occurs the number of steps taken, the expected value and the direction the arm w as tra ve li ng is noted in th e erro r lo g.

Spillover test

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-92 System Overview PRODIGY Service Manual (Rev C - 2000)

Measures the effect of high energy photons registering as low energy photons in the det ector system. The beam passes through a brass piece that stops all low energy photons. The detector then measures the number of low energy photons detected as a measure of spillover. Spillover should be less than 13%. Spillover with the CZT detector will degrade about 0.2% per year.

Spillover Stability test

As part of the secondary calibration, the change in spillover must be

calculated on a p er ele ment basis and smoot hed over t he l ast 3 p assin g QA' s. Daily QA measur e s actu a l sp il lo ve r an d s t or es it in Q A da ta ba s e. As pa rt of primary calibration, the spillover value used during that calibration is stored. The delta spillover calculation using the spillover from pr imary calibration and the running average of the last five spillover measurements. This information is in the scan file.

Reference Value Test

The output of the x -r ay tube is measured as part of a Reference Value (old term was air) measurement. This is measured at various currents between 3mA and 0.150mA.

Note: Not al l curren ts tha t are r amped t o / test ed are used to perfo rm

patient scans.

Reference Value measurement

The HE/LE counts are measured as the number of photons counted by detector. This value is used in all bone density calculations. It must be stored in the systems data file. Limits for low/hi gh counts -

• Reference value m easurements will be performed at various currents. These reference values are stored separately for all detector elements.

• Reference Value measurements for all cu rrent se ttings ar e actu ally made through lucite sections of the secondary calibration block.

Reference value ratio test

The HE/LE ratio for each reference value is calculated for each tube current tested in reference value measurement.

Detector Pre-AMP test

The detector Pr e-amplif iers a re teste d by remo ving detect or bias and veri fying that the signal out lines of the detector are not noisy.

Tissue Value T est

Tissue secondary calibration

• The system measures two tissue eqivilent materials (lucite and Acetron).

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-93

• Store measured va lues for each chamber per element in QA database.

• The system determines the%fat for two different materials with different compositions.

• Three%fat values are displayed - lean, mid a nd fat

• These calculate d%fat v alues are compared again st ex pecte d values and checked against limits for the mean, standard deviation.

BM Chamber Measurements

The system acquires point measurements on the 3 bone chambers (approx 12 seconds / measurement) using the 3ma medium scan mode. The system determines th e bone mi nera l cont ent for th e thre e chamb ers o f dif fe rent si zes and densities.

• Measured values for each chamber are stored on a per element basis in the QA database.

• These calculated BM values are compared against expected values and checked against limits for the mean, standard deviation.

• A slope is calcul ated and this adjustment is used as a secondary BMD calibration to offset long term drifts in system performance.

Daily QA Results

At the end of Dai ly QA, a r eport is aut omatical ly pr inted. If p rinte r is n ot on l ine or fails, post an error to screen.

If Daily QA fails, post an error message that says "Unsuccessful QA Recommend repeating procedure."

• If a QA fails the error log wil l co nt ai n de ta iled information on the failure.

Test results are saved automatical ly to a database. Appropriate secondary calibration and Reference Value information is

recalculated from QA database using an average of the 3 previous passing test results. This information is stored in each scan file.

A view with plot of medium bone chamber is gener ated, and user the user is allowed to manipulate data interactively.

2.17.4 QA Database

A historical record of system performance is maintained by storing key QA parameters in a database.

• 3mA Results - fat is hidden - only bone results are v iewable

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to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-94 System Overview PRODIGY Service Manual (Rev C - 2000)

Lunar Corporation

726 Heartland Trail

Madison, WI 53717

1.051 Daily QA Measurement Date 3/20/00 Time 9:07:32 AM

1.007 BMD Medium (High mA) 0.971g/cm

0.971g/cm Deviation -0.82%

Trend Summary

0.957 Mean BMD Medium (High 0.971g/cm CV Total Sessions 3

0.907 1/17/00 2/8/00 3/1/00 3/23/00

____________________________________________________________________________

Functional Tests Secondary Calibration Test Value Status Test Mean %CV Status

Block Position Pass BMD Peaking 1400-3300 Pass Large Batch1 or 2 <=1% Pass Beam Stop <=15 Pass Medium <=2% Pass Mechanical Test Small <=3% Pass Transverse 620mm min Pass Tissue Longitudinal 1980mm min Pass Lean <=50% Pass Mean % Spillover 5% to 13% Pass Mid <=20% Pass Spillover Stability -1% to 1% Pass Fat <=10% Pass Reference Counts Calibration Status Pass High mA 15% from Primary Cal System Status Ratio at High mA Ratio Pass Pass

Detector Status Pass

*The BMD & Tissue values are Batch dependent and can be found in service options *Transverse - Total counts/20 with the result in millimeters

*Longitudinal - Total counts/10 with the result in millimeters *Spillover Stability is spillover with respect to time.

Prodigy

LUNAR

(2.10)

Figure 2-23. PRODIGY Daily QA printout with expected values

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

PRODIGY Service Manual (Rev C - 2000) System Overview 2-95

This document contains confidential or proprietary information of GE-Lunar Corp. Neither the document nor the information therein is

to be reproduced, distributed, used or disclosed, either in whole or in part, except as specifically authorized by GE-Lunar Corp.

2-96 System Overview PRODIGY Service Manual (Rev C - 2000)

GE PRODIGY Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0 General Safety

1.1 Symbols and labels fou nd on the PRODIGY

1.1.1 External Symbols

1.1.2 Intern al Symbols

1.1.3 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

1.6.1 Pinch points

1.6.2 Laser safety

1.6.3 Radiatio n safety

1.6.4 Scatter Radiation

1.7 Controlling Computer and Accessories

1.7.1 Electrical Safety IEC and UL/CSA certification

1.7.2 Electromagnetic interference

1.7.3 Peripheral Configurations

1.7.4 Standard room configuration (system no. DF+12000 and greater)

1.7.5 Small room configuration (system no. DF+12000 and higher)

1.7.6 Scanner power output configuration (system no. DF+11999 and lower)

1.7.7 Wall outlet configuration (system no. DF+11999 and lower)

2.0 PRODIGY System

2.0.1 PRODIGY Electronics

2.1 Electronics

2.1.1 Cautions

2.1.2 Electronics Pan

2.1.3 Scan Arm

2.1.4 Power specifications

2.2 PRODIGY Block Diagrams

2.2.1 PRODIGY I (System numbers DF+11999 and lower) Power Distribution Block Diagra m (AC ent ranc e)

2.2.2 PRODIGY System Block Diagram PRODIGY I System Block Diagram

2.2.3 PRODIGY I Peripheral Configuration Block Diagrams

2.2.4 PRODIGY II System / Power Block Diagram

2.3 PRODIGY Fusing

2.4 PRODIGY I (system numbers DF+11999 and lower) Single Board Controller

2.4.1 SBC Functions

2.4.2 SBC Reset

2.4.3 SBC / Host PC Interface

2.5 PRODIGY II Combined Single Board Controller (cSBC) (systems DF+12000 an d greater)

2.5.1 cSBC System Architecture

2.5.2 cSBC Functions

2.5.3 TRANS / LONG MOTOR Control and Status

2.5.4 AGS ROLL

2.5.5 AGS DAC

2.5.6 SCANNER RESET

2.5.7 GE-LUNAR Model 7861 X-ray Generator Errors

2.5.8 DC FAIL

2.5.9 DCA / AGS / BIAS DAC's

2.5.10 KV/mA DAC

2.5.11 ARC/FIL DAC

2.5.12 PEAK DAC

2.5.13 MAX PLD Peripherals

2.5.14 Interrupts

2.5.15 MASTER RESET

2.5.16 SUICIDE RESET

2.5.17 MISC OUT

2.5.18 MISC IN

2.5.19 Stepper Motor Control

2.5.20 OMI Input

2.5.21 Pati ent Positioners

2.5.22 Limit Switches

2.5.23 X-ray Source Control / Mechanical Interlocks

2.5.24 Shutter / Collimator Drive

2.5.25 End of Exposure Alarm

2.5.26 Panel LED's

2.5.27 HVPS Cont rol

2.5.28 ADC

2.5.29 mA Low Range

2.5.30 Detector Interface

2.5.31 Communications Ports Host RS-422 Port

2.5.32 Debug RS-232 Port

2.5.33 Diagnostic LED's