Toshiba Alexion Service Manual
No. 2D201-177EN*F
SERVICE MANUAL 2
FOR
TOSHIBA SCANNER
TSX-033A
(2D201-177EN*F)
TOSHIBA MEDICAL SYSTEMS CORPORATION 2011-2013
ALL RIGHTS RESERVED
Trademarks
MicrosoftWindows is a registered trademark of Microsoft Corporation in the United States
and other countries.
Alexion is a trademark of Toshiba Medical Systems Corporation.
This manual may include trademarks of other companies.
Note that the mark and the mark may or may not be used in this manual.
IMPORTANT!
1. No part of this manual may be copied or reprinted, in whole or in part,
without prior written permission.
2. The contents of this manual are subject to change without prior notice
and without legal obligation.
3. The contents of this manual are correct to the best of our knowledge.
Please inform us of any ambiguous or erroneous descriptions, missing
information, etc.
No. 2D201-177EN*F
REVISION RECORD
REV. DATE
(YYYY-MM)
REASON
/AUTHOR CHANGED
PAGE
SER. DOC.
No. PRODUCT.
INI. 2011-09 Mr. Tezuka ------- TM-WI2
*A 2012-03 Change of configuration of PC BOX supplied as
service part
Mr. Sato
Subsections
4.5.2.11,
4.5.2.13
*B 2012-04 Support of improvement requests Mr. Tezuka Sections 2, 3
*C 2012-07 Use of GMSC PWB Mr. Oishi All pages TM-WI2G
*D 2012-08 Support of new OPCONTM PWB due to
Section 3
discontinuation of production Mr. Sawanaga
*E 2012-12 Support of EU Installer Mr. Kawanabe Subsection 2.8
*F 2013-05 Change of ADI PWB Mr. Kurihara Section 4
No. 2D201-177EN*F
3
THIS PAGE IS LEFT BLANK INTENTIONALLY.
No. 2D201-177EN*F
4
How to Use This Manual Effectively
No. 2D201-177EN*F
5
1. Notation Conventions
This manual uses the following conventions for word usage in addition to the signal words
(refer to "General Safety Information") that indicate remarks related to safety precautions.
Carefully read the contents of this manual before performing service work.
NOTE: Indicates information of interest to users of equipment as to exceptional
conditions or operating procedures.
2. Organization of the Service Manuals
The following 2 volumes are provided as service manuals for the Alexion system
(TSX-033A).
Service manual organization
Alexion service
manuals
Service manual 1
(2D201-176EN)
Service manual 2
(2D201-177EN)
Configuration of the gantry
Mechanical section of the patient couch
Gantry/couch control section
X-ray system
Data acquisition section
Data transmission unit
Console
Power distributor
No. 2D201-177EN*F
6
Table of Contents
How to Use This Manual Effectively .................................................................. 5
General Safety Information .................................................................................... 13
1. THE X-RAY SYSTEM ................................................................ 21
1.1 Configuration ............................................................................................... 22
1.2 Specifications .............................................................................................. 22
1.3 Principles of Operation ........................................................................ 23
1.4 Operation Method ..................................................................................... 24
1.4.1 Turning ON/OFF the power supply ......................................................... 24
1.4.2 Single unit exposures ................................................................................... 24
1.5 X-ray High-Voltage Generator ......................................................... 25
1.5.1 Composition ...................................................................................................... 25
1.5.2 Operating principle ........................................................................................ 26
1.5.3 Operating principle of the AC/CONTROL section ............................. 27
1.5.4 Operating principle of the INV/HV section ........................................... 28
1.6 Outline of the X-ray Tube System ................................................ 30
1.6.1 Configuration .................................................................................................... 30
1.6.2 Specifications ................................................................................................... 30
1.7 Overload Protection (OLP) Management Functions ...... 32
1.7.1 Functional description .................................................................................. 32
1.7.2 Calculation and monitoring of the anode heat capacity ................ 32
1.7.3 Short-term monitoring of the rating ........................................................ 32
1.7.4 Short-term monitoring of the nominal rating ...................................... 33
1.8 Tools and Instruments .......................................................................... 34
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1.9 Notices .............................................................................................................. 35
1.9.1 Floating section ............................................................................................... 35
1.9.2 Power cable ....................................................................................................... 35
1.9.3 Precautions for rotation ............................................................................... 36
1.9.4 Handling the high-voltage cable .............................................................. 37
1.9.5 Replacing the fuse ......................................................................................... 40
1.9.6 Using the tube voltage meter .................................................................... 40
1.9.7 Tube ammeter .................................................................................................. 41
1.9.8 Other ..................................................................................................................... 42
1.10 Replacing the X-ray Tube ................................................................... 43
1.10.1 Connection and operation check ............................................................. 43
1.10.2 X-ray tube aging .............................................................................................. 46
1.10.3 If adjustment ..................................................................................................... 47
1.11 Troubleshooting ........................................................................................ 61
1.11.1 X-ray high-voltage generator troubleshooting ................................... 61
1.11.2 Troubleshooting flowchart for main circuit ......................................... 68
1.11.3 X-ray tube troubleshooting ......................................................................... 78
1.11.4 XC error log reference procedures ......................................................... 81
2. DATA ACQUISITION SECTION ................................... 87
2.1 Introduction ................................................................................................... 88
2.2 Configuration ............................................................................................... 88
2.2.1 Components ...................................................................................................... 88
2.2.2 Configuration table ........................................................................................ 89
2.2.3 Layout drawing ................................................................................................ 90
2.3 Overall Operation ...................................................................................... 91
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2.4 Main Detector ............................................................................................... 92
2.5 REF Detector ................................................................................................ 93
2.5.1 Connections between the main detector, the REF detector,
and the DAS ...................................................................................................... 93
2.5.2 Correspondence between the main detector channels
and the DAS channels .................................................................................. 94
2.6 DAS ................................................................................................................... 103
2.6.1 T-CONVERTER PWB ................................................................................... 103
2.6.2 T-CONTROL PWB ......................................................................................... 103
2.7 DAS Power Supply ................................................................................ 124
2.7.1 5.7 V power supply .................................................................................... 124
2.7.2 3.3 V power supply .................................................................................... 125
2.7.3 24 V power supply ...................................................................................... 125
2.8 Identifying Problems ............................................................................ 126
2.8.1 Notices on work ............................................................................................. 126
2.8.2 Tools and instruments................................................................................ 126
2.8.3 Possible problems and troubleshooting ............................................ 127
2.8.4 DAS integrator-dependent abnormality .............................................. 132
2.8.5 DAS gain-dependent abnormality .......................................................... 132
2.8.6 Slice thickness-dependent abnormalities .......................................... 132
2.8.7 Check of the DAS supply voltage .......................................................... 133
2.9 Repair .............................................................................................................. 133
2.9.1 Before repair ................................................................................................... 133
2.9.2 Replacement of the DAS PWB (Removing and remounting a
PWB) ................................................................................................................... 134
2.9.3 Replacement of the main detector ........................................................ 136
2.9.4 Replacement of the REF detector .......................................................... 141
2.9.5 Setting after replacing the temperature controller ......................... 144
No. 2D201-177EN*F
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3. DATA TRANSMISSION UNIT ....................................... 151
3.1 Introduction ................................................................................................. 152
3.2 Beam Emitting/Receiving Section (MUDAT) ...................... 154
3.2.1 Functions of the MUDAT ........................................................................... 154
3.2.2 Composition .................................................................................................... 154
3.2.3 External view .................................................................................................. 159
3.2.4 System diagram and operating principle ........................................... 161
3.3 IF Unit (Interface Unit) [OPCONTM, GCIFM] ....................... 163
3.3.1 Functions of the IF unit .............................................................................. 163
3.3.2 Operating principle ...................................................................................... 163
3.3.3 External appearance .................................................................................... 169
3.4 LED Display and Switch Setting .................................................. 170
3.4.1 OPCONTM PWB ............................................................................................. 170
3.4.2 GCIFM PWB ..................................................................................................... 179
3.5 Installing the CPU Data for the OPCONTM PWB ............. 188
3.5.1 Tools and equipment used ....................................................................... 188
3.5.2 Preparation ...................................................................................................... 188
3.5.3 Installation of the PWB data ..................................................................... 190
3.5.4 Changing the data version identification label ................................ 192
3.6 Troubleshooting ...................................................................................... 194
3.6.1 Malfunction of the data transmission section .................................. 194
3.6.2 Malfunction of control system data communication ..................... 194
3.6.3 Malfunction of DAS data communication ........................................... 199
3.6.4 Procedure for checking the luminescence ........................................ 210
3.6.5 Procedure for disassembling the MUDAT .......................................... 214
3.6.6 Operation check after MUDAT work ..................................................... 215
No. 2D201-177EN*F
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4. CONSOLE .............................................................................................. 217
4.1 Outline ............................................................................................................. 218
4.1.1 The configuration of the console ........................................................... 218
4.1.2 Internal configuration of the Navibox .................................................. 219
4.1.3 Components of the Navibox .................................................................... 220
4.2 Power Supply, Signals, and Connection
Diagrams
4.2.1 Power system connection diagram ...................................................... 221
4.2.2 Signal system connection diagram ...................................................... 222
....................................................................................................... 221
4.3 Power Controller ..................................................................................... 223
4.3.1 External appearance of the power CONT ........................................... 223
4.3.2 Setting the DIP switches of the power CONT ................................... 224
4.3.3 Connection diagram of the power CONT ............................................ 225
4.3.4 Power control ................................................................................................. 226
4.4 Operation Section .................................................................................. 228
4.4.1 Configuration .................................................................................................. 228
4.4.2 Monitor .............................................................................................................. 229
4.4.3 Keyboard .......................................................................................................... 229
4.4.4 Mouse ................................................................................................................ 231
4.5 System/Acquisition Section (Navibox) ................................... 232
4.5.1 Configuration .................................................................................................. 232
4.5.2 PC BOX ............................................................................................................. 233
4.5.3 ADI PWB ........................................................................................................... 254
4.5.4 Multi drive ........................................................................................................ 257
4.5.5 USB port (for option license installation) ........................................... 257
4.5.6 System disk, image disk, and raw data disk ..................................... 258
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4.5.7 HUB ..................................................................................................................... 261
4.6 Malfunction Diagnosis Program .................................................. 264
4.6.1 Malfunction diagnosis program (hwtest) ............................................ 264
4.6.2 Malfunction diagnosis program (hwtest) menus and details of
each test ........................................................................................................... 266
4.6.3 Executing the independent test program (diag) .............................. 267
4.6.4 Independent test program (diag) execution results ...................... 268
4.7 Signal Tables (External Cables) ................................................... 272
5. POWER DISTRIBUTOR ....................................................... 281
5.1 Functions ...................................................................................................... 282
5.2 Cable Connection ................................................................................... 284
5.3 Settings .......................................................................................................... 285
5.4 Use ..................................................................................................................... 286
5.5 Replacing the Fuse ................................................................................ 286
No. 2D201-177EN*F
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General Safety Information
No. 2D201-177EN*F
13
1. Meaning of Signal Words
In this manual, the signal words DANGER, WARNING, and CAUTION are used
regarding important safety instructions. The signal words and their meanings are defined as
follows. Please understand their meanings clearly before reading this manual.
Signal word Meaning
DANGER
WARNING
CAUTION
CAUTION
Indicates an imminently hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
Indicates a potentially hazardous situation which, if not avoided, may
result in property damage.
No. 2D201-177EN*F
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2. Safety Precautions
Please observe the following precautions to ensure the safety of the service engineer as well as
operators when servicing this equipment.
DANGER: 1. This system is not explosion-proof. Therefore, do not use
flammable or explosive gases near the system. If flammable or
explosive gases enter the system, a fire or explosion may occur.
2. Do not remove the covers of the console monitor and X-ray high-
voltage generator in the gantry because there are high-voltage
sections inside them. If the covers are removed, accidental
contact may occur, causing electric shock and possibly death.
When it is necessary to connect measuring instruments such as
an oscilloscope to a circuit of the floating section for any reason,
be sure to observe the following precautions.
Use a differential probe or isolation probe.
Do not leave the probe cable dangling when the probe is
connected to the measuring point. Doing so may cause shock
or short-circuit with the exposed GND section of the connector.
When several measuring points are monitored simultaneously
using an oscilloscope, note that the ground levels of the probes
become common.
3. If it is necessary to rotate the gantry with the cover open, take
special precautions to ensure that persons are not accidentally
caught in the rotation section.
4. When disconnecting the high-voltage cable, observe the following
to fully discharge its residual charge in order to ensure safety
during servicing work.
Turn power OFF and wait 10 minutes or more.
When the high-voltage cable has been disconnected,
simultaneously ground two of the three pins at the top of the
bushing in all three combinations. Repeat all combinations
twice or more.
Do not touch the top of the bushing.
Place a cap, vinyl cover, etc. over the tip of the bushing to
protect it.
5. When it is necessary to touch the slip ring or brushes (for
example, to clean the slip ring or to replace the slip ring brushes),
turn OFF all the breakers on the distribution board in advance.
Otherwise, an electric shock will result.
No. 2D201-177EN*F
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DANGER: 6. Gantry rotation may continue even if an eXam Plan is interrupted.
Particularly when servicing work (phantom replacement etc.) is
performed with the gantry cover open, observe the following.
Be sure to terminate the eXam Plan and confirm that rotation of
the rotation section has stopped.
Turn OFF CP320 (power to the rotation servo motor).
7. Do not remove the covers of the console monitor and X-ray high-
voltage generator in the gantry because there are high-voltage
sections inside them. If the covers are removed, accidental
contact may occur, causing electric shock and possibly death.
WARNING: 1. Before starting service procedures, turn OFF the breaker and all
the system power switches on the distribution board. (To ensure
safety.)
2. Make sure that ground cables are securely connected for
electrical shock prevention and stable system operation.
3. The system employs a laser beam device. Do not look directly
into the laser beam, as doing so could injure your eyes.
4. After opening the gantry front cover, support the cover with two
supporting poles to the rear of the cover. Use the supporting
poles correctly.
If the supporting poles are used incorrectly or the cover is lifted
inadvertently, the supporting poles may fall causing the cover to
close suddenly due to its weight, resulting in injury.
5. Since the rotation section of gantry may rotate suddenly,
carefully install the CT scanner. (For example, when console is
changed to "eXam Plan" during operation or a short-circuit is
caused by any part being touched with the probe of the
measuring instrument.)
6. If a part of the rotation section of gantry is to be removed, be
sure to engage the rotation lock pin of the rotation drive section.
Otherwise, the rotation section may rotate suddenly due to the
weight imbalance caused by removal of the part, and a worker
may get caught in the rotation section and be seriously injured
as a result. Hold the rotation section firmly when pulling out the
rotation lock pin.
7. After completing the work, be sure to confirm that all mounting
screws of the cover are tightened firmly.
If the gantry is tilted with the screws not tightened firmly, the
cover may open, fall, or interfere with objects around it, leading
to injury or damage.
No. 2D201-177EN*F
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CAUTION: 1. Do not modify or repair the system without permission.
Failure to do so may result in system malfunction or incorrect
system operation.
2. When repair or replacement work must be temporarily interrupted,
take appropriate measures such as closing the covers etc. to ensure
safety.
3. Connecting or using any device in combination may cause the
system to operate unstably or dangerously.
4. Make sure that the power supply, frequency, voltage and voltage
fluctuation values conform to the specifications of the system.
5. Make sure that all cable connectors are connected correctly and
that the cables and oil hoses are arranged properly.
6. Make sure that no cooling oil leaks.
7. Before starting X-ray exposure, check whether the necessary
protective measures have been taken, so that the door is closed, no
persons or X-ray sensitive materials such as film are in the scanner
room, and X-rays do not leak from the scanner room.
8. When tilting the gantry, never place your foot on the stand base
cover. Your foot may be caught, resulting in injury.
9. When replacing the X-ray tube, observe the following precautions.
Be careful about the tube because the tube may move
longitudinally during this work.
Insert the rotation lock pin into the rotation lock pin retaining
plate securely.
10. Take precautions against electric shock because power is supplied
up to the input terminal of MC113 in the servo unit even when the
circuit protector CP1 of the gantry stationary section is turned OFF.
11. Disconnect CN451 of the KGTSM (GMSC) PWB to turn OFF the
power of tilt motor, rotation servo system, couch etc.
If the safety circuit is defective or if your operation was incorrect,
the tilt, rotation motor or couch may move.
12. Do not perform high-speed rotation while the SOT mounting plate is
removed. Interference may occur or cables may be caught in the
rotation section.
(Note that this precaution does not need to be observed when all
four SOT mounting plates are removed.)
No. 2D201-177EN*F
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CAUTION: 1. Keep the site room at proper temperature and humidity, and well ventilated.
Keep the system protected from unnecessary vibration or shock.
2. When cleaning or disinfecting the system, take care not to damage the system.
* Use only the specified disinfectants and lubricants in the specified manner
and frequency. Failure to do so may result in discoloration or cracking of the
surface finish, or in damage to rubber or plastic parts.
* Do not clean the unit with organic solvents (such as paint thinner) or
abrasive cleansers because they may cause damage or discoloration.
3. When the gantry is to be tilted with the front cover open, be extremely careful
not to allow the front cover to come into contact with the ceiling or the patient
couch. Otherwise, the system may be damaged.
4. Never pull the cable when disconnecting the connector. Doing so may damage
the cable.
5. When removing the dome cover, be sure to disconnect the connectors located
at the top of the gantry. Otherwise, cables may be severed.
6. When connecting the cables of the starter at the time of replacing the X-ray
tube, be sure to refer to the circuit diagrams and check the marker placed on
the cable to perform correct cable connection. Incorrect connection may cause
damage to the anode rotation mechanism.
7. Do not bend the belt as it contains fiber. The belt will not function normally if
bent.
8. Do not apply an excessive force to the brake release lever when installing the
brake release lever handle. The brake release lever may be damaged.
9. Be extremely careful when handing the hydraulic hose. The hydraulic hose is
very fragile (minimum permissible bending radius: 45 mm). If the hose is bent,
it will be permanently damaged and can no longer be used.
10. Do not perform ON/OFF operation of SW320 during gantry rotation. Doing so
may damage the servo-amplifier. To turn OFF the power, use CP320.
11. Do not perform continuous scanning (that is, a set of start and stop operations
performed consecutively) more than ten times. Doing so may damage the
servo-amplifier.
If repetitions of continuous scanning are required, stop for two minutes after
scanning is performed ten times.
12. When mounting/removing the bushing to/from the X-ray tube receptacle, do not
remove the bushing suddenly or rotate the cable. Doing so may damage the
pin section on the tip of the bushing.
13. When performing wiring again, do not bundle the power cable with the signal
cables.
14. When adjusting the XC maintenance program parameters, do not change the
settings for parameters other than If. Doing so may damage the generator.
No. 2D201-177EN*F
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3. Precautions for Service Work
Countermeasures against static electricity
If service work is performed at sites at which countermeasures against static electricity
are not taken, be sure to take countermeasures against static electricity to prevent the
PWBs from being damaged and to ensure quality.
[Examples]
When performing service work such as replacement of PWBs, be sure to wear a wrist
strap.
If PWBs must be put down somewhere, they must be placed on an antistatic mat.
NOTE: Periodic inspection
Be sure to perform periodic inspection to confirm that appropriate countermeasures
against static electricity are being taken (the antistatic mechanism functions normally).
(Perform continuity check.)
<Additional information>
Manufacturer : Sumitomo 3M, Inc.
Model name : 8012J
Product name : Conductive plastic product portable field service kit
Items contained : Antistatic mat ············ 1
Wrist strap ················ 1
4.5-m ground cable ····· 1
No. 2D201-177EN*F
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No. 2D201-177EN*F
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CHAPTER 1
THE X-RAY SYSTEM
No. 2D201-177EN*F
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1.1 Configuration
The X-ray system comprises the following components:
Component Model Features
X-ray high-voltage
generator
X-ray tube CXB-200E Anode heat capacity: 2000 kHU,
CXB-350A/2A Anode heat capacity: 3500 kHU,
1.2 Specifications
The specifications of the X-ray system are given below:
Item Specifications
Radiation method Continuous
Tube voltage
Tube current 10 to 300 mA*1
Radiation time Differs according to the direction from the central system.
80, 100, 120, or 135 kV (3%)
10-mA increments (3-mA increments up to 5%)
(0 to 100 s: 5%)
CXXG-010A/3 Incorporates the control circuit, high-
frequency inverter.
Maximum output of 36 kW
line voltage of 200 V or more)
made by Varian
made by Varian
*1
(42 kW at a
Focus 2 focuses
Anode rotation 2700 min-1 to 3600 min-1 (depending on line frequency).
Power required 3-phase, 200 VAC, 50/60 Hz
Voltage fluctuation Less than 10% (including -5% fluctuation under load)
*1 The maximum output value and the maximum tube current depend on the system
output limit.
For 16-kW systems, the maximum output value is 16 kW and the maximum tube
current is 200 mA.
No. 2D201-177EN*F
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1.3 Principles of Operation
The block diagram of the X-ray system is shown below.
System
communication
Interlock
Control from
outside
Tube voltage
feedback
Tube current
feedback
OLP
management
Operation
control
Door switch
External lamp
Slice counter
Inverter
feedback control
Filament
feedback control
High-voltage
tank
Rotor control
To each
transformer
Inverter driver
Filament
heating circuit
Filament
transformer
3-phase, 200 VAC,
50/60 Hz
Line noise
filter
Rectification
Smoothing
Inverter
High-voltage
transformer
Rectification
X-ray tube
Cooling unit
Block diagram of the X-ray system
FilamentStator coil
Anode and
cathode
No. 2D201-177EN*F
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1.4 Operation Method
Switching of the power supply, the control method as a single unit, and the operating
conditions are explained.
1.4.1 Turning ON/OFF the power supply
Turning ON the power supply
Turn ON the power supply of the
system (console) according to
the normal procedure.
Turning OFF the power supply
Turn OFF the power supply of
the system (console).
*1: The power-ON status may continue for a certain period depending on the DAS
timer setting.
1.4.2 Single unit exposures
Select "DCA test" or "If Remote" from the system maintenance menu at the console
side.
The power is supplied to the gantry, and the
X-ray high-voltage section starts changing the
smoothing capacitor. The main relay is turned on
in about 6 seconds, charging is completed, and the
system becomes ready for operation.
The main relay are turned off and electric discharge
of the smoothing capacitor begins. When heat
build-up of the X-ray tube is high, the gantry power
supply maintains its energized state for cooling.
When the required cooling time elapses, the power
supply will go off automatically.
*1
No. 2D201-177EN*F
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1.5 X-ray High-Voltage Generator
1.5.1 Composition
The configuration of the X-ray high-voltage generator is shown below.
(1) AC/CONTROL section
(2) INV/HV section
(3) Interconnecting cables
X-ray high-voltage generator
No. 2D201-177EN*F
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1.5.2 Operating principle
A three-phase power supply is connected to the AC/CONTROL section.
The input range is from 170 to 230 VAC. The XCS PWB installed in the AC/CONTROL
section functions as an interface with the system.
The AC/CONTROL section outputs approximately 300 VDC. This DC voltage is
supplied to the INVERTER/HV section. The DC voltage is used to supply power to the
inverter and the filament circuit. The output cable of the INVERTER/HV section is
connected to the X-ray tube via the two Federal Standard X-ray connectors. The output
cable from the cathode is also connected to the floating filament of the X-ray tube.
DANGER: Before disconnecting cables or
removing covers, wait for at least 5
minutes after turning OFF the power
supply. Failure to observe this warning
may result in serious injury or death.
The AC/CONTROL and INVERTER/HV sections contain some
parts that are not insulated. A dangerous voltage may be
present even if the contactor is OFF.
No. 2D201-177EN*F
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1.5.3 Operating principle of the AC/CONTROL section
The AC/CONTROL section supplies the required direct current power to the inverter
circuit. The AC/CONTROL section consists of three main subassemblies (chassis
assembly, system control PWB, and AC PWB). Its input is connected to the K1
contactor, the CR1 rectifier, and the DC output connector. The K1 contactor performs
failsafe shutdown of the voltage in the major sections.
(1) AC PWB
The AC PWB has a filtering function, a soft start circuit function, and a monitoring
function.
If a voltage of more than 75 VDC is present in the AC PWB, display is performed
with neon tube DS1.
(2) System control PWB
The system control PWB has an inverter control function, a kV and mA monitoring
function, and an error detection function.
The LED indicator locally displays the status of the generator.
POWER ON : Indicates that +5 V power supply is present in the
system control PWB.
TEST MODE : Indicates that switch SW1 is in test mode.
FAULT (problem) : Indicates that the generator is in error mode. Detailed
data concerning the error is provided by digital I/O.
HV ON (high-voltage ON) : Indicates that a high voltage (more than 10 kV) is
present in the output from the generator.
SPARE : This is mainly used for repair at the factory. This
indicates the phase mode of the inverter. The display
"LED on" indicates outside the phase mode.
FIL ON (filament ON) : Indicates that the filament is ON.
STARTER ON : Indicates that the starter is ON. (Not used)
CONTACTOR ON : Indicates that the contactor is ON.
No. 2D201-177EN*F
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1.5.4 Operating principle of the INV/HV section
The INV/HV section is a DC-DC converter that consists of three main assemblies: the
inverter assembly, the high-voltage multiplier, and the high-voltage transformer.
DC input is applied to the resonance inverter. The inverter operates in phase mode and
frequency mode. The maximum operating frequency of the inverter is approximately
30 kHz. The output of the step-up transformer is approximately 5 kV Pk AC. This is
supplied to the two half-wave multipliers. These multipliers comprise a double-voltage
rectification circuit. The input voltage is sequentially doubled by the serially connected
multipliers.
The rated output of the multiplier is a DC voltage of ±70 kV. This is supplied to the
X-ray tube. The INV/HV section is connected to the AC/CONTROL section via the
control cable and the DC power cable.
(1) Inverter assembly/inverter PWB
The inverter assembly contains the inverter heat sink, the cooling fan, the DC input
connection section, the IGBT, and the inverter PWB.
WARNING: The gate drive circuit and the IGBT inverter circuit are high-
voltage circuits. Do not perform repair or maintenance work
on these circuits and do not attempt to measure these
circuits using a probe. If it is necessary to touch them, be
sure to first check that there is no DC voltage relative to
earth (chassis) using a tester or equivalent device.
NOTE: No calibration is required on site. The generator can be repaired without
performing recalibration. The inverter assembly and the high-voltage module
are components that cannot be replaced on site. Calibration of the highvoltage module is performed by the inverter PWB. Therefore, the high-voltage
module and the inverter PWB cannot be replaced individually.
If a power supply of more than 75 VDC is present in the inverter PWB, the neon
tube lights.
(2) High-voltage module
This high-voltage module contains the high-voltage multiplier, the high-voltage
feedback divider, the filament transformer, and the anode/cathode connectors.
The high-voltage module is fully encapsulated. As described in the previous
subsection, the high-voltage module is not replaceable on site.
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(3) XCS PWB
PX71-07786 Gr.2
Part Name XCS2
PWB No. YWM1634
ROM No. C10051-XX
Connection diagram 3XW71-1848
Mounting position Within the AC/CONTROL section
Functions
Communication control Y
Output of basic control signals Y
Monitoring of internal status Y
Selection of output voltage and
Y
current
Tube current modulation control Y
(Sure Exposure,
Sure Exposure 3D
(XY modulation)
*1
)
Control of OLP Y
Holding of power supply for
Y
cooling the X-ray tube
Backup of the basic information
Y
memory
Control of the slice counter Y
Control of the dedicated starter Y
*1: Sure Exposure 3D is enabled only when a system supporting this function is
used in combination.
No. 2D201-177EN*F
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1.6 Outline of the X-ray Tube System
This subsection describes the configuration and specifications of the X-ray tube system.
1.6.1 Configuration
The X-ray tube system comprises the X-ray tube unit and the heat exchanger, which are
connected via the cooling oil circulating hose. The X-ray tube is mounted on the gantry
rotation section. They cannot be separated because of air-tight structure.
Hose
1.6.2 Specifications
Model
Anode heat capacity (kHU) 2000 3500
Anode cooling rate (kHU/min)
(maximum)
Maximum tube voltage (kV) 150 140
Dimensions of the focus (mm)
(Pinhole method)
(Slit method)
X-ray tube mass (kg) Approx. 33 Approx. 34
Heat exchanger mass (kg) Approx. 17 Approx. 17
X-ray tube unit
CXB-200E,
Varian GS-2078/A
252 285
Small: 0.9 0.9
Large: 1.5 1.0
Small: 1.1 1.3
Large: 1.7 1.7
Heart exchanger
CXB-350A/2A
Varian GS-3078/A
Small: 0.9 0.9
Large: 1.5 1.0
Small: 1.1 1.1
Large: 1.7 1.7
No. 2D201-177EN*F
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