Toshiba EXCELART Vantage MRT-1503 S5 W5 X5 S3 W3 X3 MRI Service Manual 2D900-030EN – 2007

Toshiba EXCELART Vantage MRT-1503 S5 W5 X5 S3 W3 X3 MRI Service Manual 2D900-030EN – 2007

The Toshiba EXCELART Vantage MRT-1503 S5 W5 X5 S3 W3 X3 MRI Service Manual 2D900-030EN – 2007 is a detailed service reference for the EXCELART Vantage series superconducting MRI system models MRT-1503/S5, MRT-1503/W5, MRT-1503/X5, MRT-1503/S3, MRT-1503/W3, and MRT-1503/X3. Its coverage runs from magnetic-field safety and operating environment requirements through controller electronics, RF generation and reception, the superconducting magnet and refrigerator, gantry hardware, patient couch mechanisms, gradient power supplies, transformer cabinet equipment, and the optional shim coil amplifier. The manual is organized around service work, with system block diagrams, board settings, LED indications, wiring and connection information, troubleshooting sections, replacement procedures, adjustments, service parts references, and operational checks.

System and Service Scope

This Toshiba EXCELART Vantage MRT-1503 service manual begins with the precautions required when working around an energized superconducting magnet. It addresses magnetic medical prostheses, metallic accessories, tools and measuring instruments, access control in the MRI room, emergency action during a quench, very low-temperature cryogen hazards, and precautions specific to the short-axis magnet used in MRT-1503 systems. The system chapter then identifies the main equipment configuration: gantry, patient couch, wall cabinet, controller, RF cabinet, gradient power supply and control cabinet, refrigerator, transformer cabinet, supervisory unit, QD whole-body RF coil, cables, and accessories.

Technical reference material in the early system section gives the service engineer important operating and interface data. The magnet is identified as a 1.5-tesla superconducting type with a 655 mm aperture and liquid helium cryogen. The manual distinguishes gradient performance between the S5/W5/X5 group and the S3/W3/X3 group, and it documents RF transmission data, magnet-bore dimensions, room temperature and humidity requirements, power supply requirements, and patient couch dimensions, positioning accuracy, and maximum load. It also lists compatible RF coils and optional units used with the system, helping the reader understand how the base configuration can be equipped.

Controller, RF and Signal-Path Service

A major portion of the Toshiba EXCELART Vantage MRT-1503 S5 W5 X5 S3 W3 X3 MRI Service Manual 2D900-030EN – 2007 is devoted to the controller and its electronics. The controller coverage identifies the G-CONT, power, RM, ETCM, Gigabit Ethernet hub, FEP-PC/PC-VAP, reconstruction engine, UPS, CPU cabinet, control box, control pad, monitor, keyboard, mouse, and related operator-room equipment. Detailed board sections explain the RM, RSV5, WGV3, RFCV5, GRC, CANV2, TCIF, RAW, DF, and ETCM boards, including functions, switch settings, connectors, standard configurations, and LED indications. Cable diagrams show 100-VAC distribution, signal links, network connections, and internal controller wiring.

The replacement chapter goes beyond identification and includes component access and service procedures for the control cabinet, server PC, and CPU cabinet. It covers items such as hard disks, memory modules, network and RAID cards, graphics hardware, power supplies, and drives, with photographs and location drawings that help relate the written procedure to the actual cabinet hardware.

The RF cabinet section follows the signal path through the RF unit and RF amplifier. It covers the RF chassis, RXM chassis, RFIF, ADIF, FSM, DADM and RXM boards, DC power supplies, board settings, LED indications, analog signal I/O, adjustment terminals, internal wiring, and optical signal connections. Maintenance procedures include RF amplifier replacement, RF cabinet relocation, RF chassis access, PWB replacement, PS1 and PS2 replacement, and power-supply output adjustment. A separate RF amplifier subsection describes composition, ratings, operation, MRI-system connection, methods for locating faulty sections, and replacement.

Magnet, Gantry and Patient Couch Coverage

The magnet system chapter is built around the service risks and procedures unique to superconducting MRI equipment. It provides precautions for very low-temperature cryogen and the superconducting magnet, then covers the magnet structure, quench conditions, rupture-disk replacement, quench-valve leak checks, quench vent-line checks, abnormal helium boil-off, shield-temperature measurement, O-ring handling, and liquid-helium refilling guidance. The Magnet Supervisory Unit section includes functions, operation, replacement, circuit diagrams, and spares. The APD refrigerator material addresses structure, couplings, charging and venting, status displays, troubleshooting, and compressor internal wiring.

Gantry coverage identifies ferromagnetic-material locations, warning labels, cable connections, the magnet-bore light, flow switch, cover removal, and vacuum-chamber removal. The SIDE-RF system and QD whole-body coil sections add board-level and RF-coil troubleshooting material. The patient couch chapter explains operating principles for vertical and horizontal movement, the mechanical structure, cover removal, hydraulic-cylinder replacement, pump-unit oil-level adjustment, UP/DOWN limit switching, couch-height adjustment, horizontal travel limits, guide-roller adjustment, and port pin assignments.

IMAGES PREVIEW

Gradient Power, Transformer and Shim Systems

The gradient power supply chapter covers both CASCADE-type and DX-type systems. It identifies the applicable power-supply types, ratings and service tools, then works through boards, block and connection diagrams, error finding, part replacement, and service parts. The CASCADE material includes the GSSU and its D11/D112 DAC, D12 regulator, D14 modulator, D16 CAN/Service, and D17 I/O boards. The DX section covers the GCU boards, inrush control and rectifier boards before moving into its troubleshooting and replacement procedures. These sections are particularly useful when a service task requires tracing a gradient-system fault from control signals through the high-power hardware rather than treating the power supply as a single replaceable unit.

The transformer cabinet chapter explains the system transformer and the optional vacuum pump unit that maintains vacuum in the gantry vacuum chambers. It includes external views, connection information, vacuum-pump structure and operation, diaphragm and bearing replacement, pressure switch and timer material, and a troubleshooting list. The optional shim coil amplifier chapter closes the technical coverage with requirements for use, ratings, operating principles, AMP module and interface-board details, power circuitry, cables, troubleshooting, abnormal-image symptoms associated with shim amplifier faults, temporary countermeasures, part replacement, and operational checks.

File Details

• Manual type: Service Manual
• Brand: Toshiba
• Series: EXCELART Vantage
• Models: MRT-1503/S5, MRT-1503/W5, MRT-1503/X5, MRT-1503/S3, MRT-1503/W3, MRT-1503/X3
• Document number: 2D900-030EN
• Initial revision: 02/’07
• Language: English
• Pages: 604
• File format: PDF

Chapters Covered

• 1. SCOPE
  • Precautions Related to the Magnetic Field
• 2. OPERATING ENVIRONMENT
  • Power Voltage
  • Operating Temperature and Humidity
• 3. SYSTEM
  • Standard Configuration
  • Combinable Units (optional)
  • System Block Diagram
  • Classification of Equipment
  • Influence on Peripheral Units
  • Cleaning
• 4. CONTROLLER
  • Descriptions and Locations of Warning Labels
  • External View and Configuration
  • Controller Cable Connections
  • Settings of the Switches on the Boards and the Units and Descriptions of the LEDs
  • Replacement Procedures
• 5. RF CABINET
  • Overview
  • Warning Labels on the RF Cabinet
  • Fuses and Breakers (NFBs)
  • Precautions Regarding the RF Cabinet
  • Operating Principles
  • Composition of the RF Unit
  • Internal Wiring
  • External Connections (Optical Signals)
  • Maintenance and Replacement Procedures
  • RF Amplifier
• 6. WALL CABINET
  • Outline
  • GIF V5 Board
  • Troubleshooting for the Patient Couch and Gantry System
• 7. MAGNET SYSTEM
  • Overview
  • Superconducting Magnet
  • Magnet Supervisory Unit (MSU)
  • APD Refrigerator
• 8. UNITS OF THE GANTRY
  • Locations of Ferromagnetic Materials
  • Warning and Caution Labels
  • Cable Connections in the Gantry
  • Light in the Magnet Bore
  • Flow Switch
  • Removing the Gantry Covers
  • Removing the Vacuum Chambers
  • SIDE-RF System
  • QD Whole-Body Coil
  Complete PDF Bookmark Tree

  Complete Bookmarks

  The complete bookmarks in the “Toshiba EXCELART Vantage MRT-1503 S5 W5 X5 S3 W3 X3 MRI Service Manual 2D900-030EN – 2007” are as follows:

  Safety Precautionsp. 4

  +1. SCOPEp. 14

  +1.1 Precautions Related to the Magnetic Fieldp. 15

  1.1.1 Magnetic medical prosthesesp. 16

  1.1.2 Metallic accessoriesp. 18

  1.1.3 Metallic tools, appliances, and measuring instrumentsp. 19

  1.1.4 Countermeasures against emergencies in the MRI room (superconducting MRI system)p. 21

  1.1.5 Precautions for the short-axis magnetp. 22

  1.1.6 Other precautionsp. 22

  +2. OPERATING ENVIRONMENTp. 27

  2.1 Power Voltagep. 27

  2.2 Operating Temperature and Humidityp. 27

  +3. SYSTEMp. 29

  3.1 Standard Configurationp. 29

  3.2 Combinable Units (optional)p. 30

  3.3 System Block Diagramp. 31

  3.4 Classification of Equipmentp. 32

  +3.5 Influence on Peripheral Unitsp. 32

  3.5.1 Data on the magnetp. 32

  3.5.2 Data on the gradient fieldp. 35

  3.5.3 Data on the radio frequency (RF) emissionp. 35

  3.5.4 Data on the magnet borep. 35

  3.5.5 Data on the patient couchp. 35

  3.6 Cleaningp. 36

  +4. CONTROLLERp. 37

  4.1 Descriptions and Locations of Warning Labelsp. 37

  +4.2 External View and Configurationp. 38

  4.2.1 G-CONT unitp. 42

  4.2.2 Power unitp. 42

  4.2.3 RM unitp. 43

  4.2.4 ETCM unitp. 45

  4.2.5 Hub unit (for Gigabit Ethernet)p. 46

  4.2.6 FEP-PC unit (PC VAP unit)p. 46

  +4.2.7 Reconstruction engine unitp. 47

  4.2.7.1 AP-PC unitp. 47

  4.2.7.2 Server PC unitp. 47

  4.2.8 UPS (uninterruptible power supply) unitp. 48

  4.2.9 Operator room unitp. 49

  4.3 Controller Cable Connectionsp. 54

  +4.4 Settings of the Switches on the Boards and the Units and Descriptions of the LEDsp. 59

  4.4.1 RM boardp. 59

  4.4.2 RSV5 boardp. 60

  4.4.3 WGV3 boardp. 65

  4.4.4 RFCV5 boardp. 71

  4.4.5 GRC boardp. 75

  4.4.6 CANV2 boardp. 92

  4.4.7 TCIF boardp. 95

  4.4.8 RAW boardp. 96

  4.4.9 DF boardp. 99

  4.4.10 ETCM boardp. 104

  4.4.11 Gigabit Ethernet hub unitp. 109

  +4.4.12 FEP-PC unit (PC-VAP unit)p. 111

  4.4.12.1 PRB3 boardp. 120

  +4.4.13 UPS (uninterruptible power supply) unitp. 122

  4.4.13.1 Overviewp. 124

  4.4.13.2 External dimensions and part namesp. 125

  4.4.13.3 Operation (normal start)p. 129

  4.4.13.4 Basic operationp. 131

  4.4.13.5 Protective functionsp. 133

  4.4.13.6 Maintenance and inspectionp. 136

  4.4.14 Control boxp. 139

  4.4.15 LCD monitorp. 144

  +4.5 Replacement Proceduresp. 147

  4.5.1 Replacement of components in the control cabinetp. 148

  4.5.2 Procedure for replacing the service parts in the server PCp. 149

  4.5.3 Procedure for replacing the service parts in the CPU cabinetp. 155

  +5. RF CABINETp. 163

  5.1 Overviewp. 163

  5.2 Warning Labels on the RF Cabinetp. 166

  5.3 Fuses and Breakers (NFBs)p. 175

  5.4 Precautions Regarding the RF Cabinetp. 176

  5.5 Operating Principlesp. 177

  +5.6 Composition of the RF Unitp. 178

  5.6.1 Slot composition of the RF chassis and the RXM chassisp. 178

  5.6.2 RFIF board and ADIF boardp. 180

  5.6.3 FSM boardp. 181

  5.6.4 DADM boardp. 181

  5.6.5 RXM board (in the RXM chassis)p. 181

  5.6.6 DC power supply units in the RF unitp. 182

  5.6.7 Board settingsp. 188

  5.6.8 LED indicationsp. 197

  5.6.9 Analog signal I/Op. 200

  5.6.10 Adjustment terminalsp. 200

  5.6.11 RF unit errorsp. 201

  5.7 Internal Wiringp. 202

  5.8 External Connections (Optical Signals)p. 208

  +5.9 Maintenance and Replacement Proceduresp. 209

  5.9.1 RF Amplifier Replacementp. 209

  5.9.2 Replacement or relocation of the RF cabinetp. 212

  5.9.3 Pulling out the RF chassisp. 215

  5.9.4 Replacement of PWBs inside the RF chassisp. 216

  5.9.5 Replacement of PWBs inside the RXB chassisp. 217

  +5.9.6 Replacement of the PS1 unitp. 218

  5.9.6.1 Removing the PS1 unitp. 218

  5.9.6.2 Installing the new PS1 unitp. 218

  +5.9.7 Replacement of the PS2 unitp. 218

  5.9.7.1 Removing the PS2 unitp. 218

  5.9.7.2 Installing the new PS2 unitp. 218

  5.9.8 Adjustment of the PS1 output voltagesp. 219

  5.9.9 Adjustment of the PS2 output voltagesp. 220

  +5.10 RF Amplifierp. 221

  5.10.1 Outlinep. 221

  5.10.2 Compositionp. 222

  5.10.3 Power ratingsp. 223

  5.10.4 Amplifier operationp. 223

  +5.10.5 Connection with the MRI systemp. 224

  5.10.5.1 Outlinep. 224

  5.10.5.2 System I/F cablep. 225

  5.10.5.3 BNC connector (Refer to figure 5.10-2.)p. 225

  5.10.5.4 HN connector (Refer to figure 5.10-2.)p. 225

  +5.10.6 Methods for finding faulty sectionsp. 226

  5.10.6.1 If an error occursp. 226

  5.10.6.2 Error occurrence status display and LED status displayp. 226

  5.10.7 Replacementp. 226

  +6. WALL CABINETp. 227

  6.1 Outlinep. 227

  6.2 GIF V5 Boardp. 232

  6.3 Troubleshooting for the Patient Couch and Gantry Systemp. 237

  +7. MAGNET SYSTEMp. 239

  +7.1 Overviewp. 239

  7.1.1 General precautionsp. 239

  7.1.2 Precautions for handling the very low-temperature cryogenp. 241

  +7.1.3 Precautions for handling the superconducting magnetp. 243

  7.1.3.1 Emergency helium discharge pipe system and ventilationp. 243

  7.1.3.2 Precautions against vacuum failurep. 246

  7.1.3.3 Precautions at the time of maintenancep. 246

  7.1.3.4 Other precautions for handling the unitsp. 247

  +7.2 Superconducting Magnetp. 248

  7.2.1 Safety labelsp. 248

  7.2.2 Outline drawingp. 254

  7.2.3 Description of each partp. 255

  7.2.4 Quenchp. 256

  +7.2.5 Replacement of the rupture diskp. 260

  7.2.5.1 Replacing the main rupture diskp. 260

  7.2.5.2 Replacing the auxiliary rupture diskp. 262

  7.2.5.3 Checking the integrity of the service turret and the valve sealp. 262

  7.2.6 Leak check for the quench valvep. 263

  7.2.7 Checking the quench vent line blanking flangep. 263

  7.2.8 Abnormal level of helium boil-offp. 264

  7.2.9 Measuring the shield temperaturep. 266

  7.2.10 Handling of the O-ringp. 269

  7.2.11 Hints and tips for LHe refillingp. 269

  +7.3 Magnet Supervisory Unit (MSU)p. 272

  +7.3.1 Functions and operationp. 272

  7.3.1.1 D1 module (monitor)p. 273

  7.3.1.2 D2 module (He, EIS, and battery)p. 275

  7.3.1.3 D3 module (ERDU)p. 278

  7.3.1.4 D4 module (processor)p. 280

  +7.3.2 MSU replacement procedurep. 282

  7.3.2.1 Boards D1 to D4p. 283

  7.3.2.2 Removing the DC power modulep. 284

  7.3.2.3 Replacing the DC power supply unit and battery packp. 286

  7.3.2.4 Replacing an external batteryp. 288

  7.3.3 Circuit diagramsp. 290

  7.3.4 Sparesp. 303

  +7.4 APD Refrigeratorp. 304

  7.4.1 Precautions of the APD refrigeratorp. 304

  7.4.2 Definition of symbols used in this subsection and on the refrigeratorp. 307

  7.4.3 Safety labelsp. 308

  7.4.4 Appearance and structure of the refrigeratorp. 309

  7.4.5 Handling of Aeroquip couplingsp. 310

  7.4.6 Charging or ventingp. 311

  7.4.7 System status displayp. 315

  +7.4.8 Troubleshootingp. 316

  7.4.8.1 Error conditionsp. 317

  7.4.8.2 Clearing error conditionsp. 318

  7.4.8.3 Restarting after an error conditionp. 318

  7.4.8.4 Troubleshooting guidep. 319

  7.4.9 Compressor internal wiringp. 321

  +8. UNITS OF THE GANTRYp. 323

  8.1 Locations of Ferromagnetic Materialsp. 323

  8.2 Warning and Caution Labelsp. 325

  8.3 Cable Connections in the Gantryp. 328

  8.4 Light in the Magnet Borep. 328

  8.5 Flow Switchp. 329

  8.6 Removing the Gantry Coversp. 330

  8.7 Removing the Vacuum Chambersp. 336

  +8.8 SIDE-RF Systemp. 337

  8.8.1 Generalp. 337

  8.8.2 Troubleshooting related to the SIDE-RF systemp. 341

  8.8.3 RFSB boardp. 341

  8.8.4 GETB boardp. 343

  +8.9 QD Whole-Body Coilp. 344

  8.9.1 Outlinep. 345

  8.9.2 Bobbin and tuning sectionp. 346

  8.9.3 Circuit sectionp. 347

  8.9.4 Troubleshooting for the RF coil systemp. 348

  +9. PATIENT COUCHp. 350

  9.1 Overviewp. 350

  9.2 Sections Where Magnetic Parts Are Usedp. 351

  +9.3 Principles of Operationp. 352

  9.3.1 Couch controlp. 352

  9.3.2 Vertical movement drive of the patient couchp. 356

  9.3.3 Couchtop horizontal movement drivep. 358

  +9.4 Structural Description of the Couch Main Bodyp. 359

  9.4.1 Couchtop horizontal movement drivep. 364

  9.4.2 Couchtopp. 365

  9.4.3 Vertical movement mechanical controlp. 366

  9.4.4 Vertical movement drive sectionp. 367

  +9.5 Mounting and Removing the Coversp. 368

  9.5.1 Outline of workp. 368

  9.5.2 Detailed work proceduresp. 368

  +9.6 Replacement and Adjustment of Partsp. 374

  9.6.1 Replacing the hydraulic cylinder as a whole setp. 374

  9.6.2 Oil level adjustment of the pump unitp. 377

  9.6.3 UP and DOWN limit switching and couch height adjustment (see figures 9.6-3, 9.6-4, and 9.6-5)p. 377

  9.6.4 Couchtop horizontal movement limit switching and adjustment (see figures 9.6-6 and 9.6-7)p. 380

  9.6.5 Adjustment of the couchtop guide rollerp. 382

  9.7 Pin Assignment of Each Portp. 383

  +10. GRADIENT POWER SUPPLYp. 390

  +10.1 Outlinep. 391

  10.1.1 Types of gradient power supply and ratingsp. 391

  10.1.2 Differences between the KL and TELI gradient power suppliesp. 392

  10.1.3 Types of KL gradient power supplies and differences between themp. 393

  10.1.4 Types of TELI gradient power supplies and differences between themp. 394

  10.1.5 Tools required for servicingp. 394

  10.1.6 Reference: Temperature, humidity, and condensationp. 395

  +10.2 CASCADE-Type Gradient Power Supplyp. 397

  10.2.1 Caution labelsp. 397

  10.2.2 Name and function of each sectionp. 399

  10.2.3 Block diagram and connection diagramp. 405

  10.2.4 D11 (or D112) DAC board in the GSSUp. 407

  10.2.5 D12 REGULATOR board in the GSSUp. 409

  10.2.6 D14 MODULATOR board in the GSSUp. 414

  10.2.7 D16 CAN/Service board in the GSSUp. 417

  10.2.8 D17 I/O board in the GSSUp. 420

  +10.2.9 Troubleshootingp. 423

  10.2.9.1 D12 REGULATOR boardp. 424

  10.2.9.2 D14 MODULATOR boardp. 427

  10.2.9.3 D17 I/O boardp. 435

  10.2.9.4 Failure of the power stagep. 435

  10.2.9.5 Failure of the soft-start circuitp. 438

  10.2.9.6 The gradient power supply cannot be turned ONp. 439

  +10.2.10 Part replacement proceduresp. 440

  10.2.10.1 Boards in the GSSU (Gradient Small Signal Unit)p. 440

  10.2.10.2 Current sensor unitp. 443

  10.2.10.3 Power stagesp. 446

  10.2.10.4 D32 rectifier boardp. 450

  10.2.10.5 D31 soft-start boardp. 452

  10.2.10.6 Fan (below the power stages)p. 453

  10.2.10.7 Choke coilp. 454

  10.2.10.8 AC line filterp. 455

  10.2.10.9 Manifold (water distributor) and manifold couplersp. 456

  10.2.10.10 Soft-start contactorp. 457

  10.2.10.11 Separating the gradient power supply from the control cabinetp. 459

  10.2.11 Service partsp. 463

  +10.3 DX-Type Gradient Power Supplyp. 468

  10.3.1 Caution labelsp. 468

  10.3.2 Name and function of each sectionp. 470

  10.3.3 Block diagram and connection diagramp. 476

  10.3.4 DACG1 board in the control board chassis (GCU)p. 480

  10.3.5 PWMG1 board in the control board chassis (GCU)p. 483

  10.3.6 COBG1 board in the control board chassis (GCU)p. 485

  10.3.7 Inrush control boardp. 494

  10.3.8 Rectifier boardsp. 496

  10.3.9 Troubleshootingp. 497

  +10.3.10 Part replacement proceduresp. 509

  10.3.10.1 Boards in the control board chassisp. 509

  11.3.10.2 Current sensor unitp. 512

  10.3.10.3 Power stagesp. 515

  10.3.10.4 Rectifier board unitp. 519

  10.3.10.5 Inrush control boardp. 521

  10.3.10.6 Fan (below the power stages)p. 522

  10.3.10.7 Choke coilp. 523

  10.3.10.8 AC line filterp. 524

  10.3.10.9 Manifold (water distributor) and manifold couplersp. 525

  10.3.10.10 Soft-start contactorp. 526

  10.3.10.11 Low-voltage fusesp. 527

  10.3.10.12 DC power supplyp. 528

  10.3.10.13 Separating the gradient power supply from the control cabinetp. 531

  10.3.11 Service partsp. 534

  +11. TRANSFORMER CABINETp. 540

  11.1 Outlinep. 540

  11.2 External Viewsp. 541

  11.3 System Transformerp. 543

  +11.4 Vacuum Pump Unit (Option)p. 545

  11.4.1 Precautions for handling the vacuum pump unitp. 545

  11.4.2 Structure of the vacuum pump unitp. 545

  11.4.3 Function of each partp. 548

  11.4.4 Vacuum pump operating procedurep. 548

  11.4.5 Structure of the vacuum pumpp. 550

  11.4.6 Replacing the diaphragms in the vacuum pumpp. 550

  11.4.7 Replacing the bearings in the vacuum pumpp. 550

  +11.4.8 Procedure for replacing the diaphragms and associated componentsp. 551

  11.4.8.1 Replacing the diaphragmsp. 552

  11.4.8.2 Replacing the valvesp. 555

  11.4.8.3 Replacing the non-return valvesp. 557

  11.4.8.4 Replacing the O-ringsp. 558

  11.4.8.5 Replacing the head gasketsp. 559

  +11.4.9 Pressure switchp. 560

  11.4.9.1 Set value checking procedurep. 561

  11.4.9.2 Unit selection procedurep. 562

  11.4.9.3 Zero adjustment procedurep. 564

  11.4.9.4 Switch functionsp. 565

  11.4.10 Timerp. 568

  11.4.11 Troubleshooting listp. 569

  +12. SHIM COIL AMPLIFIER (OPTION)p. 571

  12.1 Outlinep. 571

  12.2 Requirements for Usep. 571

  12.3 Ratingsp. 571

  12.4 Compositionp. 572

  12.5 Operating Principlesp. 572

  +12.6 Operations of Each Sectionp. 573

  +12.6.1 Basic operations of the shim coil amplifierp. 573

  12.6.1.1 Outlinep. 573

  12.6.1.2 Turning ON the power of the shim coil amplifierp. 573

  +12.6.2 AMP module (figure 12.6-4)p. 580

  12.6.2.1 Front panel (figure 12.6-6)p. 580

  12.6.2.2 GAIN STAGE PWB (figure 12.6-4)p. 581

  +12.6.3 SHIMD IF PWB tray (figure 12.6-5)p. 581

  12.6.3.1 Tray (figure 12.6-7)p. 581

  12.6.3.2 SHIMD IF PWB (figure 12.6-5)p. 582

  12.6.4 POWER PWB (figure 12.6-8)p. 583

  12.6.5 Power supply section (figure 12.6-9)p. 584

  +12.6.6 Connection cablesp. 585

  12.6.6.1 Interconnecting cables and connecting sectionsp. 585

  12.6.6.2 Function of each interconnecting cablep. 585

  12.6.6.3 Signal cables within the chassis and their functions (figure 12.6-10)p. 586

  +12.7 Troubleshootingp. 588

  12.7.1 Precautions during troubleshootingp. 588

  12.7.2 Troubleshooting proceduresp. 588

  12.7.3 Meanings of LEDsp. 589

  +12.7.4 Details of troubleshootingp. 590

  12.7.4.1 AMP modulep. 590

  12.7.4.1.1 When the HV READY LED on every AMP module is not lit (figure 12.6-6) (No HV FLT LED on the AMP modules is lit)p. 590

  12.7.4.1.2 When the HV FLT LED is lit (figures 12.6-2, 12.6-4, and 12.6-6)p. 590

  12.7.4.1.3 When the 15V READY LED is not lit (figures 12.6-2 and 12.6-6) (15V READY LED on the SHIMD IF PWB is lit)p. 590

  12.7.4.1.4 When the CURRENT ERROR LED lights (figures 12.6-2, 12.6-4, and 12.6-6)p. 591

  12.7.4.1.5 When the FUSE ERROR LED lights (figures 12.6-2 and 12.6-4)p. 591

  12.7.4.1.6 When the OVER TEMP LED lights (figures 12.6-2 and 12.6-4)p. 591

  12.7.4.2 SHIMD IF PWB trayp. 592

  12.7.4.2.1 When the HV FLT LED lights (figure 12.6-7)p. 592

  12.7.4.2.2 When 15V READY LED and/or 5V READY LED is not lit (figures 12.6-2, 12.6-5, and 12.6-7)p. 592

  12.7.4.2.3 When the ALL READY LED is not lit (figure 12.6-7)p. 592

  12.7.5 Abnormal image generation due to malfunctioning shim coil amplifierp. 593

  +12.7.6 Temporary countermeasures in case of shim coil amplifier failurep. 594

  12.7.6.1 Precautionsp. 594

  12.7.6.2 Procedures for taking the temporary countermeasures (also refer to figure 12.6-3)p. 594

  12.7.6.3 Recovery procedures (also refer to figure 12.6-3)p. 595

  +12.8 Procedures for Parts Replacementp. 596

  +12.8.1 AMP module replacement and adjustment proceduresp. 596

  12.8.1.1 Tools and jigs required for replacementp. 596

  12.8.1.2 Replacement procedures (also refer to figures 12.6-2, 12.6-4, and 12.8-1)p. 596

  12.8.1.3 AMP module offset adjustment proceduresp. 598

  12.8.2 SHIMD IF PWB replacement procedures (also refer to figures 12.6-2 and 12.6-5)p. 598

  +12.9 Operational Checksp. 599

  12.9.1 Starting up the unitp. 599

  12.9.2 Checking the output currentp. 599

  12.10 Caution Labelsp. 601

• 9. PATIENT COUCH
  • Overview
  • Sections Where Magnetic Parts Are Used
  • Principles of Operation
  • Structural Description of the Couch Main Body
  • Mounting and Removing the Covers
  • Replacement and Adjustment of Parts
  • Pin Assignment of Each Port
• 10. GRADIENT POWER SUPPLY
  • Outline
  • CASCADE-Type Gradient Power Supply
  • DX-Type Gradient Power Supply
• 11. TRANSFORMER CABINET
  • Outline
  • External Views
  • System Transformer
  • Vacuum Pump Unit (Option)
• 12. SHIM COIL AMPLIFIER (OPTION)
  • Outline
  • Requirements for Use
  • Ratings
  • Composition
  • Operating Principles
  • Operations of Each Section
  • Troubleshooting
  • Procedures for Parts Replacement
  • Operational Checks
  • Caution Labels

Taken as a whole, the chapter structure gives a technician a system-level path from safety and environmental checks to cabinet and board identification, signal tracing, fault isolation, mechanical access, component replacement, adjustment, and post-service operational checks. It combines system architecture with subsystem-level service detail, so the reader can move between the MRI system as a complete installation and the individual controller, RF, magnet, gantry, couch, gradient, transformer, refrigerator, and shim-amplifier assemblies involved in a repair.

Service, Diagnose and Repair with the Correct Reference

The Toshiba EXCELART Vantage MRT-1503 S5 W5 X5 S3 W3 X3 MRI Service Manual 2D900-030EN – 2007 supports a wide range of practical service work: tracing controller and RF faults, interpreting board LEDs and switch settings, checking cable and optical-signal paths, troubleshooting the patient couch and gantry, servicing magnet-support and refrigerator equipment, replacing specified electronic and mechanical components, working through gradient power-supply faults, and carrying out documented adjustments and operational checks. For equipment this complex, using the correct procedures, connection diagrams, settings, safety precautions, and model-specific specifications matters when diagnosing a fault or returning a serviced subsystem to operation.

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