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Chapter 3 Theory of Operation

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Models QT-740 & QT-750 - Service Manual

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Summary of Contents for QT-740

Page 1: ...Models QT 740 and QT 750 Manual Part No DC30 007 Revision B Service Manual Fixed Elevating Float Top Radiographic Tables...

Page 2: ...copied photocopied reproduced translated or reduced to any electronic medium or machine readable form without prior consent in writing from Quantum Medical Imaging LLC Made in U S A Quantum Medical I...

Page 3: ...ice Manual i REVISION DATE TYPE OF MODIFICATION A 12 07 00 Initial Release B 1 5 01 Added long magnet adjustment tabletop width adjustment DC Motor Driver Bd replacement procedure Page Number Rev Page...

Page 4: ...Revision History ii Models QT 740 QT 750 Service Manual THIS PAGE INTENTIONALLY LEFT BLANK...

Page 5: ...ONNECTIONS 10 Power Input Connections Permanent Wiring Configuration 10 Bucky Power Input Connections 10 PBL Interlock Cable Connections 10 ALIGNMENT PROCEDURES 12 TABLE LEVELING 12 IMAGE RECEPTOR COL...

Page 6: ...MAINTENANCE 36 Visual Inspection 36 Functional Check for Model QT 750 Elevating Tables 36 Lubrication 38 REMOVAL REPLACEMENT PROCEDURES 38 Replacing the Drive Belt Model QT 750 Tables Only 38 Replaci...

Page 7: ...Chapter 1 1 SPECIFICATIONS...

Page 8: ...2...

Page 9: ...Tabletop Motion 4 Way Floating Tabletop Material Fiber resin phenolic Tabletop X ray Density 1 0 mm Aluminum Tabletop to Film Plane Distance approx 2 5 inches 63 5 mm TABLE BASE SPECIFICATIONS Width 4...

Page 10: ...0 5 0 Amps Long Term Current Model QT 740 0 05 Amps Model QT 750 0 20 Amps Locking System Power 24 VDC 4 35 Amp SYSTEM OPTIONS Abdominal compression band Lateral cassette holder for cross table work S...

Page 11: ...Chapter 1 Specifications Models QT 740 QT 750 Service Manual 5 Figure 1 Model QT 740 Table Configuration Diagram...

Page 12: ...Chapter 1 Specifications 6 Models QT 740 QT 750 Service Manual Figure 2 Model QT 750 Table Configuration Diagram...

Page 13: ...Chapter 7 2 ASSEMBLY INSTALLATION...

Page 14: ...8...

Page 15: ...Series X ray Generators POSITIONING THE TABLE BASE Place the table base in the approximate location where it will be mounted Ensure that the floor below the table is level When positioning the table...

Page 16: ...mpletely factory pre wired no connections are required to enable the internal circuitry Power Input Connections Permanent Wiring Configuration 1 To connect external wires to table either bring cables...

Page 17: ...apter 2 Assembly Installation Models QT 740 QT 750 Service Manual 11 POWER INPUT CABLE TERMINAL BOARD TB2 TERMINAL BOARD TB1 Figure 3 Connecting Input Power Cable Figure 4 System Ground Wire Connectio...

Page 18: ...ansverse travel of the x ray tube relative to the table set the tube transverse travel in the center detent position prior to performing align ment The following x ray alignment procedure may require...

Page 19: ...binet to tabletop frame 8 Move the tubestand and Receptor Cabinet simultaneously to check for contin uous alignment of the narrow beam of light to the cassette center line see Figure 5 9 If the light...

Page 20: ...ment procedures TABLETOP ASSEMBLY INSTALLATION CAUTION Be careful not to damage the Obstruc tion Sensors when installing the Tabletop Assem bly The following procedure describes how to install the Tab...

Page 21: ...ly onto the bearing assemblies from the right hand end of the table as viewed from front of table 6 Verify tabletop frame is square as follows a At one end of the table measure the distance between th...

Page 22: ...rail Ensure Brake Pad is parallel with respect to rail d Tighten two 2 hex head screws in Longitudinal Magnet Bracket 8 Reattach the End Trim Plate to the Tabletop Assembly 9 Re install the two 2 Tabl...

Page 23: ...ld remain locked while the tabletop is moving up or down 3 With the table running either up or down press the red Emergency Stop Switch Table up or down motion should stop Turn the Emergency Stop Swit...

Page 24: ...rams 2 Rotating the potentiometer clockwise CW increases speed counterclockwise CCW rotation decreases speed PEDAL DISABLE SWITCH OPERATIONAL CHECK 1 Depress the Pedal Disable Switch until the PEDAL D...

Page 25: ...djust obstruction sensors remove the Table Top Assembly refer to Table top Assembly Installation procedure in this chapter 4 Loosen the lower hex nut underside of Bearing Rail securing the switch to t...

Page 26: ...not ready for exposure 7 Try to take an x ray exposure and verify that no exposure is possible MODEL QT 750 COVERS INSTALLATION ADJUSTMENT PROCEDURE Proceed as follows after completing all wiring alig...

Page 27: ...h star washers and to Upper Front Cover using two 2 8 32 x 3 8 screws and external tooth star washers 8 Verify there is adequate clearance for the top covers test run the table up and down while check...

Page 28: ...Chapter 2 Assembly Installation 22 Models QT 740 QT 750 Service Manual Figure 13 Upper Rear Cover Installed UPPER REAR COVER...

Page 29: ...Chapter 23 3 THEORY OF OPERATION...

Page 30: ...24...

Page 31: ...nally and transversely The Receptor Cabinet rides on four linear ball bearings mounted to adjustable brackets attached to either side of the cabinet These bearings travel on the hardened and pol ished...

Page 32: ...foot pedal and push button are fully operational Receptor Cabinet Lock The Receptor Cabinet magnetic lock has its own release switch S5 for Receptor Cabinet positioning When S5 is pressed the Receptor...

Page 33: ...BIT outputs are applied through A1J1 9 and A1J1 1 to DC Motor Driver Board A2 H1 and H2 terminals Relays A1K5 and A1K6 are also energized in a similar fashion which releases the Motor Brake and redund...

Page 34: ...5B 7 enables the motor drive circuit for operation as described previously In the event a belt breaks S22 and or S23 open removing the ground at A1J2 19 Transistor A1Q4 turns on applying a low input t...

Page 35: ...ough A1U2A A1U4B and A1U1C When de energized the CONTROLLER input is open disabling the DC motor After 24 seconds from the time the active low DN signal was first applied the output at one shot A1U6A...

Page 36: ...n switch S13 located on the right Transverse Assembly cover just below the tabletop When S11 S12 or S13 is activated a high FLOAT signal is applied through 6 Way Table Control Board connector A1J2 18...

Page 37: ...ion to providing an emergency shut off function the Emergency Stop Switch serves as an indicator lamp that flashes at a 1 Hertz rate in the event one of the following faults occur Any of the obstructi...

Page 38: ...Chapter 3 Theory of Operation 32 Models QT 740 QT 750 Service Manual THIS PAGE INTENTIONALLY LEFT BLANK...

Page 39: ...Chapter 33 4 SERVICE INSTRUCTIONS...

Page 40: ...34...

Page 41: ...d by these skilled individuals Failure to follow manufacturer s or service personnel s recommendations may result in serious injury WARNING Personnel engaged in maintenance activities should exercise...

Page 42: ...erly and securely installed and free of corrosion or damage Check all electrical cabling and wiring for wear and fraying Perform an operational test and check table travel and positions applicable to...

Page 43: ...50 Service Manual 37 5 Lubricate points as shown in Figures 13 and 14 Use light weight machine quality oil only 6 Turn power on to the table Figure 15 Lubrication Points Table Frame Thompson Shafts Fi...

Page 44: ...ocations shown in Figures 15 and 16 at least every twelve months Model QT 740 requires lubrica tion at the locations shown in Figure 16 at least every twelve months REMOVAL REPLACEMENT PROCEDURES The...

Page 45: ...ower Perform an operational test and check table travel and positions Replacing the Sync Belt Model QT 750 Tables Only WARNING Remove any objects from the tabletop before continuing 1 Raise the table...

Page 46: ...pulley end of Lead Screw to Base Plate see Figure 18 Gently tap Block to remove it from Lead Screw 9 Remove Sync Belt from pulleys 10 Install replacement Sync Belt on pulleys 11 Verify the distance be...

Page 47: ...here is approximately 1 4 deflection c When belt tension is set tighten nut on Belt Tensioner 14 Verify Sync Belt Safety Switch is in open position if not motor will not operate Adjust switch height i...

Page 48: ...our 4 hex bolts 11 Be sure pulley on DC Motor is aligned with pulley on Lead Screw to within 1 16 After adjusting pulley position tighten set screw on DC Motor pulley 12 Connect replacement DC Motor w...

Page 49: ...OFF 5 ON 6 OFF 7 OFF 8 ON 8 Position replacement DC Motor Driver Board A2 on Board Mount ing Bracket and secure using screws removed in previous step 9 Connect plug into connector on DC Motor Driver B...

Page 50: ...Mounting Bracket and remove cabinet 3 Place new Receptor Cabinet inside Receptor Cabinet Mounting Brackets and install eight 8 10 32 x 1 2 screws Do not tighten screws 4 Position Receptor Cabinet in b...

Page 51: ...htly and pull the tray away from the housing REPLACEMENT PARTS AND ORDERING INFORMATION Table 2 provides a list of replaceable parts for the table Figures 22 through 28 show the locations of the repla...

Page 52: ...ot listed in Table 2 a complete description of the part including its function and location should be provided with the model number and serial number of the unit 10 Switch FLOAT Push But ton EL50 002...

Page 53: ...ns Models QT 740 QT 750 Service Manual 47 1 NOTE Model QT 750 Foot Pedal is shown below Model QT 740 Foot Pedal has only one switch Figure 22 Replaceable Parts Location Diagram 2 5 4 Figure 23 Replace...

Page 54: ...Chapter 4 Service Instructions 48 Models QT 740 QT 750 Service Manual 6 Figure 24 Replaceable Parts Location Diagram Figure 25 Replaceable Parts Location Diagram 7...

Page 55: ...Chapter 4 Service Instructions Models QT 740 QT 750 Service Manual 49 Figure 26 Replaceable Parts Location Diagram 8 9 10 Figure 27 Replaceable Parts Location Diagram 3 11 12 16...

Page 56: ...Chapter 4 Service Instructions 50 Models QT 740 QT 750 Service Manual Figure 28 Replaceable Parts Location Diagram 15 14 13 17 18 19...

Page 57: ...Chapter 4 Service Instructions 51 Models QT 740 QT 750 Service Manual...

Page 58: ...Chapter 51 5 DIAGRAMS...

Page 59: ...52...

Page 60: ...Chapter 5 Diagrams Models QT 740 QT 750 Service Manual 53 Figure 26 Model QT 740 Radiographic Table Wiring Diagram...

Page 61: ...Chapter 5 Diagrams Models QT 740 QT 750 Service Manual 54 Figure 27 Model QT 750 Radiographic Table Wiring Diagram...

Page 62: ...Chapter 5 Diagrams Models QT 740 QT 750 Service Manual 55 Figure 28 4 Way Table Control Board A1 AY40 017T...

Page 63: ...Chapter 5 Diagrams Models QT 740 QT 750 Service Manual 56 Figure 29 6 Way Table Control Board A1 AY40 002T Sheet 1 of 2...

Page 64: ...Chapter 5 Diagrams Models QT 740 QT 750 Service Manual 57 Figure 29 6 Way Table Control Board A1 AY40 002T Sheet 2...

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