Qdr 4000 service manual

Gas Spring It is not necessary to remove any covers to remove and replace either Gas Spring. Remove the retaining clip from the top of the gas spring, and remove the spring from the stud. Remove the nut that holds the lower stud in place and take the stud and spring out together. Prior to installing the new spring, lubricate the ball studs at both ends with white lithium grease.

Put the lower stud on the new spring and attach. Install the top of the spring to the top stud, and replace the retaining clip. With the C-arm in the AP position, use the Motor Control Pad to move the table out as far as it will go, for easier access.

Turn off the QDR computer and instrument power switches, and main power circuit breaker. Remove the rear tank cover covers the C-arm Interface board. Unplug all cables to the C-Arm Interface Board. Remove 4 Phillips screws and remove the board.

To replace the C-Arm Interface Board reverse the steps. Perform the Test Scan Modes procedure in the Installation section of this manual. Remove the lower C-arm cover by removing 2 Phillips screws and sliding it out from the front.

Also remove the bottom cover. Pull the XRC forward far enough to access the cables. Unplug the cables and remove the XRC. To replace the XRC reverse the steps. Using the Motor Control Pad, move the table up and in as far as it will go, and center the C-arm, for easier access to the FD. Unplug the 2 FD cables from the C-arm Interface board. Remove the FD by lifting it up while tilting it slightly forward and out. If present, ensure these are in place when re-installing the FD.

Replace the 3 hex head screws. Ensure that the curved spring washers are placed curved downward so that the washer compresses when the screw is tightened. Replace the cables. Replace the screws in the XRC assembly. Perform the Aperture Calibration procedure in the Alignment and Calibration section of this manual.

Perform Detector Flattening in the Alignment and Calibration section of this manual. Using the Motor Control Pad, move the table up and in as far as it will go, for easier access. Remove the XRC see procedure above. Remove the FD see procedure above. Lock the C-arm in place be securing the shipping brackets on each side of the arm. Carefully slide the tank out of the C-arm onto a pallet requires 2 people.

Remove the old tank from the tank tray, and install the new tank on the tray. Top View of Tank Remove the cable assembly from the old tank, and install it on the new tank see Figure Remove the Filter Drum support brackets from the old tank, and install on the new tank see Figure Slide the tank tray, with tank installed, back in place in the C-arm, and replace the Lbrackets.

Remove the 2 shipping brackets on each side of the C-arm. Replace the Filter Drum assembly. Replace the X-ray Controller assembly. Before turning on the Scanner, check the tank cable connections to ensure that they are correct. Starting with the Check Tube kV Peak Potential procedure in the Installation section of this manual, perform all the procedure in that section in order, with the exception of the Calibrate Motors and Check Laser Positioning Offset procedures.

Remove the top C-arm cover. Remove the three cables at the Mux board. Remove the two screws holding down the back of the detector assembly, and also remove the ground wire.

Remove the detector assembly cover. Remove the 6 Phillips screws holding the detector assembly to the box, and remove the entire detector assembly from the box. Note: Place the assembly on something soft such as the table pad so as not to damage the detectors. With the Mux board facing up, remove the 12 Phillips screws holding the Mux board to the center metal plate. Gently remove the Mux board from the center metal plate can be done by prying gently and evenly around all sides with a large flat blade screwdriver.

After the Mux board has been removed, loosen do not remove the screws on all three detector boards 4 on each board. Remove the screws on the detector board being replaced, and remove the detector board. Replace the detector board reverse the steps and the Mux board see above procedure. Remove the 4 bolts holding the detector assembly on rubber grommets to the C-arm see Figure Remove the detector assembly. Laser Assembly 6. To replace the laser only, loosen the laser clamping screw.

To replace the laser assembly remove the three mounting screws. To adjust the laser, loosen the laser clamping screw, turn the laser on and rotate it until the correct alignment is seen. The C-arm should be in the AP position. Remove the rear C-arm shoulder cover by removing 4 Phillips screws. Unplug the cables on the ADC board. Remove 4 Phillips screws, and remove the ADC board. To replace the ADC board reverse the steps. The power module is located at the bottom of the computer stand.

Figure shows a rear view of the power module with the side panel removed. Unplug the power cord. Remove the power module rear cover 4 Phillips screws. Locate the 28V Power Supply and unplug all cables 3 connectors.

Remove the 4 nuts holding the 28V Power Supply and remove the supply. Reverse the steps to install the new 28V Power Supply. Locate the 15V Power Supply and unplug all cables 2 connectors. Remove the 4 nuts holding the 15V Power Supply and remove the supply.

Reverse the steps to install the new 15V Power Supply. Locate the Line Filter and remove 5 push-on spade connectors. Remove the 4 nuts holding the Line Filter and remove it. Reverse the steps to install the new Line Filter. Isolation Transformer To remove and replace the Isolation Transformer refer to Figure and follow the procedure below: 1. Locate the Isolation Transformer and unplug all cables.

Remove the 4 nuts holding the Isolation Transformer and remove the transformer. Reverse the steps to install the new Isolation Transformer. Remove the side control panel 8 Phillips screws. Remove all connectors from the Power Controller Board. Remove 4 Phillips screws and slide the board out. Reverse the steps to install the new Power Controller Board. If replacement is necessary, the keyboard, monitor or printer are replaced as an entire unit.

Refer to the computer service manual for computer servicing information. Aperture Stepper Motor To remove and replace the Aperture Stepper Motor refer to Figure and follow the procedure below: 1. Unplug the motor cable. Remove the 2 Phillips screws from the motor shaft bracket. Remove the motor mount 2 Phillips screws and remove the motor assembly. Remove the motor from the motor mount, and remove the end lock nut and flat washer. Transfer the dampening pad to the new motor.

Reverse the steps above to install the new motor. Move the aperture back far enough to expose the screws that hold the PCB bracket. Remove the 2 PCB bracket screws. Unplug the cables and install the new PCB on the bracket. Loosen the 2 belt tension nuts and the belt clamping nut.

Remove and replace the belt ensure the belt is under the pem stud. Tension the belt moderately tight remove slack , and tighten the belt tension nuts. Move the aperture towards the potentiometer until it stops.

Tighten the belt clamping nut do not over tighten. Move the aperture back until the motor shaft bracket screw holes line up. Install the 2 Phillips screws holding the motor shaft bracket.

Rotary Potentiometer To remove and replace the Rotary Potentiometer refer to Figure and follow the procedure below: 1. Remove the Aperture Position Belt refer to the procedure above. Remove the potentiometer pulley. Replace the potentiometer pulley pulley goes all the way down on the shaft. Refer to the Aperture Position Belt procedure and replace the belt.

Remove the Aperture Assembly by removing 4 Phillips screws that secure the assembly, and 2 Phillips screws that secure the aperture motor mount, to the drum end plates. Unplug the PCB cable. Remove and replace the PCB ensure that the encoder wheels are not touching the sensors. Replace the Aperture Assembly. Remove the Aperture Assembly by removing 4 Phillips screws that secure the assembly, and 2 Phillips screws that secure the aperture motor mount, to the drum end plates refer to Figure Loosen the 2 drum motor mount screws, the idler screw and the outer pulley set screw.

Remove the belts. Install the Filter Drum Alignment Pin , small end first, through the slotted holes and into the small hole at the base plate.

If the pin is installed properly, the drum will not rotate. Install the tooth belt on the back pulley ensure the belt is positioned under the idler. Install the tooth belt on the front pulley. Tighten the 2 drum motor mount screws the motor mount is spring loaded to seek proper tension. Tighten the idler screw the idler is spring loaded to seek proper tension. Tighten the outer pulley set screw. Remove the Filter Drum Alignment Pin. Remove the Aperture Assembly.

Remove the drum belts see procedure above. Remove the stepper motor pulley. Remove and replace the motor 4 flathead Phillips screws. Replace the pulley, use Loctite on the set screw. Refer to the Drum Belts procedure above and replace the belts.

Remove the aperture assembly and drum belts see procedures above. Remove the 2 drum motor mount screws see Figure Remove 6 screws from underneath the drum assembly base plate 4 screws hold the end plates and 2 screws hold the motor mount spring tensioner block.

Remove the side plates and lead shields 3 Phillips screws on each side. Remove the drum encoder PCB and both encoder wheels. Remove both drum belt pulleys. Remove the drum. Remove one drum endcap 4 Phillips screws and remove the inner drum. Replace the bearings. Reassemble the drum and replace and tighten the screws in the endcap.

Replace the 2 endplates. The endplate with the cutout for the PCB goes on the drum end away from the alignment hole see Figure Replace the lead shields and side plates 6 screws.

Drum Outer Bearings Align the 2 endplates onto the holes on the recessed area on the base plate. Orient the front endplate towards the 2 slotted holes. Orient the rear endplate on the opposite set of holes and position so that the endplate side with cutout for PCB is facing the "C" cutout of the base plate.

Insert the Drum Spacing Fixture between the endcap and the front endplate. Push the filter drum against the fixture to center it between the two blocks. Do not remove the fixture at this time. Install the spacers and pulleys at the front endplate see Figure Ensure that the pulley set screws line up with the flat, and use Loctite on set screws.

Press the filter drum against the fixture, and the pulley against the endplate, while tightening the set screw. Note: Leave the outer pulley set screw loose until belts are installed. Remove the Drum Spacing Fixture. Replace the inner encoder wheel see Figure Press squeeze together the drum and encoder wheel against the endplate and tighten the set screw use Loctite Replace the outer encoder wheel.

Replace the drum encoder PCB. Ensure that the encoder wheels do not contact the sensors. Replace the stepper motor assembly 2 screws on the motor mount, and 2 screws on the base plate. Leave the motor mount screws loose for now. Replace the drum belts see the Drum Belts procedure. Tighten outer pulley set screw after belts are installed. Refer to the Aperture Assembly procedure and install the aperture assembly.

When replacing, be sure each ground lug is fastened to a ground connection, usually to the ground plane of the PCB at that end. Use a star washer between the ground lug and the ground plane.

Be sure the ground lug does not short out any component on the PCB. Please note: 1. If the "Used On" column is blank, this means that the part is used on all models. The four general categories are: Problem Refer to the section titled Many components of the system have LEDs indicating the presence of necessary voltages and the state of some signals. Section 8 is helpful in locating these LEDs and observing the state of the system.

Power Component Locations Component Laser does not turn on Possible cause Safety feature if system thinks C-arm is at head of table Corrective action Restart in Service mode 2. In most but not all cases, an error message accompanies QDR motion problems. The following suggestions apply to a QDR system that exhibits a motion problem. Start by identifying the bad axis if it is not obvious. Ask the operator for symptoms and check the error log. See Figure for possible motion directions.

Refer to This may cause problems if reversed. Left , right TZ To Operate pedestal motors by service switches located on the TZ Drive board TZ Drive Board heading, Section 2 Block diagram and interconnection chart for the TZ motor subsystem Section 8 Troubleshoot TZ drive problems Note: The pedestal drive test cable is used to isolate pedestal problems from driver problems.

Do not run the TZ motors for more than 30 seconds continuously. Exceeding the rating causes an overheat condition and shuts down the motor. After shut down, the motors must cool for at least 5 minutes before running. However, if the motor encoder is not properly calibrated it may be damaged. Perform simple table and C-arm movements Run Utility 2.

From QDR main window, select utilities, service utilities, sqdriver. The display is dynamic, allowing control panel functions to be tested.

Table X-ray tank Collimator See Figure The following suggestions apply to a QDR system that exhibits a vertical stripe in the display: Check The following suggestions apply to a QDR system that exhibits a horizontal stripe in the display: Check Tube kV peak potential Tube current X-ray beam alignment Signal strength and noise Aperture position and aperture belt Filter Drum is turning Filter Drum belt Green LEDs on C-Arm Interface board Aperture plate assembly, first precollimator, second precollimator and collimator for specs of lead and other deformities.

Object being scanned appears to the left or right of the scan window Check Detector array. It may be too far forward or back inside the upper arm assembly. Laser alignment Run If IC is not seated properly, replace the board.

Data, power, and ribbon cables for proper seating. Possible cause Refer to X-ray beam misaligned X-ray beam quality problems X-ray beam alignment on aperture Signal output level should not rise or fall by a significant margin. Measure X-ray peak potential and tube current waveforms. Make sure they are both stable and within specs. If so, test X-Ray Controller.

Check motor drive belts for excessive play. Ensure all hardware on the arm, frame, and drives are secure and clear of moving assemblies C-arm, etc.

If so, replace and restart system testing. No X-Rays If Try to align the X-ray beam to the drop-off points per the alignment procedure. Recheck the position of aperture 10 with the alignment block and pin. If the block and pin line up, the alignment brackets need to be repositioned. Check captive screws and jam nuts.

Using glow paper, assure that the X-ray beam is hitting the front and back on the detector array equally. If not, this may indicate that the X-ray tube has shifted within the letharge. Perform further verification before replacing the X-ray tank. Checking C-Arm Parallelism 3. If the aperture and detector array window are aligned, remove the aperture assembly and inspect the cup and disk.

Look for any debris or lead fragments, When replacing the cup and disk, align the apertures as closely as possible to the detector array window. Inspect the upper and lower arm assemblies and make sure they are not misaligned. This is done by aligning the 10 aperture. If the alignment process involves moving the aperture so far over that aperture 10 moves out of alignment with the X-ray beam origination from the collimator cup and pre-collimator disk, then there is an alignment problem.

You may need to reposition the tank or the upper arm assembly. Referring to Figure , assure dimension x1 is equal to x2. If this fails, inspect the aperture assembly for any loose hardware or excessive play in the aperture plate. If the belt is too tight, it may cause encoder readback errors and cause the calibration program to fail.

Check for loose, misaligned, or defective aperture assembly, collimator cup, or precollimator disk. Refer to X-ray Alignment Problems, above. Check the X-ray peak potential and tube current waveforms and monitor for waveform distortion. This may indicate a defective interconnection cable, X-ray tank, or power supply. Check output signal level. You may have to reset the ADC gain level. Check for bad detectors in the detector array assembly.

Check the filter drum to see that it is installed correctly. Check for lead fragments in the X-ray beam. Inspect the collimator cup, disk, and aperture assembly. If a failure occurs during a whole body or lateral flattening, recheck the AR and TX motor cal files.

The X-rays may be hitting the table edge. Make sure the drives are operating normally. Examine the Detector Flattening scans for any unusual indications.

If an error message is displayed, go to the Detector Flattening heading on page Be sure to turn the laser OFF when visually inspecting the shutter and aperture. When troubleshooting the laser, refer to the following: Make sure Shutter is open and not obstructing the beam Motor drives have been calibrated Page , Figure Pages to If Laser does not turn on Laser crosshair beam is defective Laser does not turn off Suggestions Software is inhibiting laser when table head is near the laser Move the C-arm to the center of the table and retry.

Do the following: 1. Shut off instrument power switch on console. Disconnect Molex laser power connector. Turn laser power on. Check computer. Check AY motor calibration file. If data is corrupt or uncalibrated, laser may not turn on, despite position of C-arm. It is important that you tighten the screws using the proper torque specifications and the proper sequence.

Tighten screw 1, then 2, then 3, and then 4. After screw 4, continue around the edge of the gasket in a clockwise direction, tightening alternate screws, until returning to 4.

Continue around the edge of the gasket in a clockwise direction, tightening all the remaining screws. Bladder Gasket Screws Tightening the Transformer Seal Screws Tighten the Transformer Seal screws using the torque settings in the table above and the sequence in the figure below. Tighten screws 1 through 6 in the sequence as indicated. Starting at the screw next to screw 6, move in a clockwise direction and tighten alternate screws.

Repeat this pattern in a clockwise direction and tighten all remaining screws. Note: The three Tank Cover Gasket screws at the rear of the tank and shown below are the most critical locations for oil leaks. Always check these screws if a leak is suspected. Important: Do not remove screws located on the tank. There are no field replaceable units or required adjustments inside the tank, so there is no reason to loosen or remove any screws on the tank.

NOTICE The QDR system meets applicable FDA radiation performance standards through its useful and expected life provided no components or parts are removed from the system and no unauthorized adjustment or unauthorized replacement of certified components is performed. If the CV of the database exceeds 0. The customer is further advised to perform a weekly backup of the patient database dbArchive and a monthly backup of the QC database QC archive. No other regular maintenance activity is recommended or required of the customer.

Compare these printouts with those from the last PM for possible problems, and keep the printouts with the service records for this system. X-ray production should be monitored by a Victoreen P or equivalent. Kohler Co. Youre covered. No matter where you are. Every Kohler power system is reliable because total integration is engineered in from the start.

So when the utility power fails, accurate monitoring, immediate communication and seamless engagement of standby power is never in doubt. Kohlers distribution network, including thirteen sales offices, covers countries throughout the Asia-Pacific region, which receives power systems manufactured in Kohlers Asia facilities.

To help cater to individual installation environments, Kohler also offers a range of accessories including controls, silencers, enclosures, fuel tanks and block heaters. Engine Bore, mm Stroke, mm Cyl, L 2. Bore, mm Stroke, mm Cyl, L 7.

Feature codes refer to specific option descriptions but are not part numbers for ordering purposes. Contact your authorized distributor for ordering options for a given generator set. X Several options possible; contact your authorized distributor. FD01 Available at no additional cost. The DEC design offers simplicity with a reduced number of buttons to operate your generator set.

Integrated maintenance monitoring programs on-screen display of future maintenance operations Built-in troubleshooting tool guides the user in the event of any alarms or faults Ability to send e-mail, SMS or Fax in the event of any alarms or faults as an option Optional tropical insulation of the circuit boards to provide protection in extremely humid conditions Compliance with various requirements or regulations CE, UL, etc.

Screen with contrast adapted to all types of lighting Five languages featured, with numerous other optional languages Remote monitoring and field updates via USB connection.

If the source changeover switch is not chosen, the DS module can be fitted in the control unit. The kohler dec control unit enables operation in both manual and automatic modes.

Modular in design, it offers high-quality basic functions, allowing easy and reliable operation of your generator set. Overload or short circuit fault Overspeed fault 1 Differential relay triggered fault Automatic standby Speed and voltage stabilization Preheating plug Switch from normal to emergency 2 Remote start order Three-phase mains detection 3 Light test Fault reset Prewiring for auto startup Regulated 12V battery charger Adjustable differential protection time and threshold Sound alarm Permanent isolation controller.

Engine speed indicator Battery voltage indicator Working hours counter Fuel solenoid valve control Starter control Preheating plug Water preheating Oil pressure fault Water temperature fault Nonstarting fault Overspeed fault 1 Genset ready to supply Charging alternator fault General alarm General fault Panel light Emergency stop fault. To increase the reliability and safety of our changeover system, VERSO now enables switch changeover.

This control unit uses a 4-pole system, with voltages from to V. The control units are designed to enable even cables with large cross-sections to be easily connected.

The control unit can be opened via the front panel and both side panels, providing easy access to the terminal connections. Direct access to the main setting controls means that it is simple to use and any possible configuration modifications can be made easily.

This manual control is used to change over the switch in the event of an electrical control fault. Switch configuration A Three phase B Single phase E Direct switching from grid to generating set F Switching from grid to generating set via neutral point G France only H Operation Nominal voltage adjustment Adjustment of period of mains supply loss Adjustment of period of mains supply return 2nd source present Automatic operation mode.

TSI Both innovative and original in design, the TSI is perfectly suited to applications where the transfer of a main source to a replacement source is crucial for the running of your installations. Straightforward and easy to use, the special feature of this module is that it is automatically configured when voltage is provided from the grid side.

Electronic switching of the power source means that the unit can be continuously self-supplied. Feet Meters 4. Note: Refer to Figure to determine clearances needed to lower the unit. Remove the two vertical caster bars on the side if installed.

Section 3 - Installation 2. Place the unit where it will be used but leave room behind it to install the C-arm. The caster bars must be removed: 1. Lift the left side of the scanner. Remove the caster bar. Set the left side of the scanner down. You may cause damage to the computer components. If necessary, remove the front panel Section 6.

Remove the carriage brackets holding the lower and upper carriage to the base. Slide the tank all the way to the left. Remove the bolts and washers holding the right caster bar to the scanner. Lift the scanner.

Gently set the scanner to the floor. Note: The four 4 caster bars must be returned to Hologic in the box provided include brackets and chocks. Refer to Figure and remove the 2 Carriage Shipping Brackets. There is one on the near right and another on the far left. Note: The mounting hardware for the C-Arm may already be installed when the system is shipped. Refer to Figure and remove this hardware before proceeding. Refer to Figure and: 1. Remove the back cover 4 screws.

Place the C-arm into the X-carriage assembly so that the mounting studs pass through the mounting holes. Note: Do NOT attach washers and nuts at this time. Attach the mounting screws and washers. Do not tighten. Fasten the brace to the X-Carriage Assembly. Do not tighten any of the six mounting screws. Fasten the ground strap to the ground lug. Install the mounting stud nuts and washers. Remove the top cover 10 screws. Feed the cables up through the C-arm channel and through the hole below the high voltage power supply.

Referring to Figure , connect the four cables as indicated. Top Cover Cables. Top Mounting Screw 2x Brace 2x 19 1 2! Adjusting Screws 4x Back Cover.

Cable and Power Bundle To install the operator console: 1. Unpack these components and set up as pictured in Figure Note: You may need to assemble the console stand. The directions are in the box that the console is shipped in. Mount the power strip on the back on the stand. Holes should be provided. If not, use nylon wraps.

Plug the printers power cord into the power strip. Plug the monitors power cord into the power strip. Referring to Figure , plug the mouse, monitor, printer and keyboard cables into the cable bundle. Plug the extension cord from the cable bundle into the receptacle in the power strip. Connecting the Operator Console Note: To gain access to the back of the computer, it may be helpful to remove the bellows behind the computer.

To do this, refer to Section 6. At the scanner end of the cable bundle: 1. Route the four gray computer cables through the Computer Cable Notch see Figure in the left side panel. Referring to Figure , plug each cable into its corresponding receptacle.

They are all labeled. This could damage the components when power is turned on. The system should be properly set to the voltage available at the customer site before it is shipped. If set improperly, it could damage the system. Refer to Figure to check for proper voltage jumpers on the isolation transformer.

The location of the isolation transformer is shown in Figure Checking the Source Voltage Jumpers Note: At this point it is recommended that you power up the system and check for general operation. Make sure that the computer boots up properly and that the scanner operates as it should.

If there is a problem, the table and front panel are removed for easy troubleshooting. Using the screws provided, and referencing Figure 1. Insert the Lexan panel into the cutout in the table. Fasten with four screws provided. Lexan Panel. Installing the Lexan Panel 3. To check this, refer to Figure and: 1. Tighten both mounting screws. Torque down the six bracket screws until they just begin to touch the metal but leave room for adjustment.

Do the same for the two mounting stud nuts. Section 3 - Installation 4. Measure the distance from the top of the Lexan panel to the bottom of the C-arm. Maneuver the C-arm vertically to achieve a distance of Tighten all the mounting screws.

Recheck the C-arm distance. If out of specification, repeat this procedure. Hologic installs the Operating System and all the optional software the customer ordered on the computer before the system is shipped from the factory.

If, by chance, you do need to install additional software, use the installation notes that come with it. When you boot the system for the first time, it asks you for the license agreement number.

The licensing information is shipped with the system. You must enter this information or you can not proceed further. Follow the instructions given after you boot the system. When Windows 95 or later starts after you power on the computer, it checks the operation of memory, the disks and other internal options.

If you suspect any problems, you should check the following computer options and peripherals for proper operation: Device 3. Go to Section Now that you have made a preinstallation cursory check of the computer, software, and the basic functions on the scanner, you must verify the scanner operation in detail and make all necessary adjustments. Use the following table as a guide to which checks and adjustments to do and the order in which to do them.

Section 4. Radiation Measurement Report Entry? Section 3. Procedure Insert the Spine Phantom number into the patient data base. Run AutoScan and do 20 scans. Analyze 20 scans. Add the 20 scans to the QC database. Print QC plots and other important information. Go to Users Guide Section Complete the following reports and return to them to Hologic when you finish the installation.

Section 4 4. See the product specifications in Section 1 for power requirements. Turn on computer power and, with an AC voltmeter, measure the voltage at the outlet the unit will be plugged into.

See Figure for the configurations of the isolation transformer. QDR Technical Manual 2. Set both traces on the screen centerline. Set both channels to AC. X-Ray Controller Test Points 5. Channel 1 displays a positive-going pulse, volts in amplitude and 0.

Channel 2 displays a line-frequency sine wave with a peak amplitude of approximately V see Figure Filter Wheel Pickoff Pulse Waveform 7. Adjust the scope trigger level so that both signals appear stable. Note: Locate where the sine wave crosses the horizontal centerline 0 V of the scope in a positive-going direction. If necessary, magnify the display by changing the sweep speed to 0.

Ideally, the time at which this crossing occurs should correspond to the middle of the channel 1 pulse. If the line voltage positive-going axis crossing: a is not centered on the pickoff pulse, perform the following steps. Do not touch it with your bare hands. Loosen the motor bolts 4 until you can turn the motor by hand.

Note: Do not over-loosen the bolts. Otherwise the calibration will change when you retighten them. Restart the motor. Restart the filter wheel motor. While observing the scope, turn the motor until the AC signal zero crossing falls within the pickoff pulse. Tighten all motor screws. Note: If the pickoff pulse can not be adjusted because it is out of range: Stop the motor. Loosen the four motor screws until the belt loosens. Move the belt in relation to the pulley by just one tooth.

Hand tighten screws to restore belt tension. Follow the procedure in step 13 above. QDR Technical Manual If problem gets worse, move the belt two teeth in the opposite direction and repeat steps above. Then repeat step If it does not, you must repeat this section.

The High Voltage Power Supply HVPS is located in the tank assembly and should be tested for proper tube voltage and current and corrected if necessary. Note: If the tube current is out of specification, there may be a problem with the tank or the X-ray controller. If the tank or the X-ray controller is replaced, beam alignment, leakage, scatter, patient dose, and filter wheel alignment must be rechecked and the system calibration must be reverified.

Gain access to the tank assembly by removing the front panel. Note: You may want to remove the table for better access. Remove the X-ray controller cover 2 screws and 2 nuts.

This board has a floating ground and may actually be volts with respect to the chassis ground. Note: Power the scope from the same source as the QDR to assure proper phase of waveforms and to minimize noise.

Connect the channel 1 probe to TP5 on the X-Ray controller board. Connect the channel 2 probe to TP6 on the X-Ray controller board. Set both channels to GND, place trace on the bottom line of the screen and then set both channels back to DC. Restore power to the X-ray controller board by releasing the emergency stop switch.

Do not continue until this number remains constant. Remove any articles from the table to minimize scatter. View the two small positive pulses that appear on the scope and grow larger after about six seconds. Adjust the scopes trigger level until the display is stable see Figure Verify that the pulse amplitudes are: 7. The following procedure details the steps to check and adjust the X-ray pulse energies. These energies must be kVp and kVp. To check and adjust them: 1.

Set up scope and probes as described in the previous section. Note: While the X-rays are on, the X-ray light on the arm must also be on. Adjust the scope to display the waveform in Figure Adjust R38 until the second highest peak of the large pulse is between Adjust R39 until the second highest peak of the small pulse is between 6. Note: When the X-rays turn off, the computer beeps several times. Also, you should do a scan on the phantom to be sure that d0 is between and If not, you may need to adjust the voltages.

To increase d0, increase the separation between kV and 70 kV. To check for the proper X-ray tube current: 1. Set up the scope as described in Section 4. Connect the channel 1 probe to TP7. Connect the channel 2 probe to TP8. Set both channels to GND, and place the trace on the bottom line of the screen. Set both channels to DC.

Do not place any objects in the beam path. Adjust the scope to display a waveform as pictured in Figure Note: If the scope does not display the proper current wave forms, the XRC or the tank assembly may have to be replaced.

Before doing this, it is advised that you contact Hologic field support personnel to discuss the situation. Double-check the readings and make sure the scope is calibrated properly. Replacing the tank assembly is a costly and time-consuming task. Divide the peak signal on the scope by 3. Refer to Section 3. Verify that the Lexan panel is installed see Figure Install the X-ray Beam Alignment tool See Figure The scope displays six pulse amplitudes, the largest of which is approximately Clamp Screws top and bottom Slide tool back to this point.

C-Arm top view. Adjusting the Main Detector Slightly flex the arm left to right and front to back and observe the scope. If this is the case, skip to step If not, proceed to step Gain access to the detector assembly see Figure Loosen the screws on the top and bottom of the holding bracket.

The top screw allows the detector to move forward while the bottom screw allows the detector to move from side to side. Move the detector left-right and forward-back to determine the location at which the pulse amplitudes are maximized.

When the maximum-signal position has been located, turn the beam off and tighten the detector mounting screws. Turn the beam back on and verify that the maximum signal amplitude is still present. If not, repeat steps Remove the tool if installed. Reinstall the C-arm top cover. The amplitude of the largest pulse displayed on the oscilloscope should be The control potentiometer which does this is on the side of the PMT HV supply itself, and can be accessed after the C-arm top cover is removed.

If the detector or PMT HV supply have not been replaced and the amplitude of the largest pulse is less than Note: The system's calibration must be verified as described in Section 4. The laser beam alignment check and adjustment are done using a pointed metal tool in this case, we use a pair of needle-nose pliers. Press the Laser button on the Operator Control Panel. Place the needle-nose pliers on the table as pictured in Figure so that the laser beam just touches the pointed tip of the pliers.

Laser Alignment--Placing Tool 3. Scan of Pliers as Seen on Screen Note: It is imperative that you do not move the tool during this procedure. If it does move, you must realign the laser steps 1 and 2 above. Note: At this point, the laser beam and the blue arrow are at the same point. The laser beam must be at the tip of the tool. If not, you must adjust the laser beam Section 4. Select utility.

Select Emergency Motion. Press 0 on the keypad Position Light. Go to the next section. To adjust the laser beam, you must gain access to the laser diode assembly. Do the following: 1.

Remove the top cover of the C-arm if not already removed. Referring to Figure , locate the laser diode assembly. Laser DiodeSide View from Right 3. Referring to Figure , adjust the laser beam so that it is at the tip of the pliers. Note: You must loosen the lock nut to adjust the laser in the X direction. Be sure to tighten when finished.

Repeat the laser check procedure in Section 4. Replace the top cover onto the C-arm. Theory Radiation leakage from the Tank Assembly results from a defect in the lead liner of the tank or its cover. If there is a hole in the lead liner, the resulting leakage manifests in a pencil beam.

If there is a crack in the lead liner, the resulting leakage manifests itself as a fan beam. If a leak is found, the meter indicates a spike in the reading. If this occurs, you must then move the probe one meter approx. Remove the front panel, if installed Section 6. Move the C-arm as far forward as possible.

Place the leakage test tool over the aperture see Figure Set the survey meter to RATE. Slowly move the meter probe Victoreen Model P or equivalent about all accessible surfaces, see table above for meter response times to detect any leaks.

If a leak is detected a spike in the reading measure that point at a one meter approx. Position the survey meter one meter approx. The reading must be 1. Record the highest reading in the service report. Replace the front panel. Scatter is the amount of radiation that bounces off of any material as the X-ray beam goes from the source to the detector. Before starting:. Position the C-arm so that the laser is just to the left of the meter without touching it.

Scan the meter. Verify that the entire meter has been scanned. That is, the entire meter can be seen on the monitor. Record the meter reading. This should be between 3. Place the spine phantom in the center of the scan area. Using a survey meter Victoreen P or equivalent , measure the radiation at a distance of 1 meter approx. Note: Move the meter slowly. Refer to the Victoreen P response time table, p. Record the highest observed reading. This should not exceed 0. Note: Skip steps 1 and 2 on initial installation.

Note: Do not proceed unless power has been on for at least 60 minutes, and the detector has stabilized. Using the spine phantom shipped with the machine, run 20 scans as described below. Following the default protocol or, for existing installations, the protocol determined in step 1 , analyze the 20 scans. If the CV exceeds 0. Repeat steps before proceeding. Compute 0. Note the system's BCF.

Note: The BCF is listed on every scan. Reboot the computer. BAT file has been changed. Run 10 more spine phantom scans, analyze them and add them to the QC database. In either case, the BMC should now be within 0. Verify that the BMD is within 0. Repeat step 5 in Section 4. TXT and spine phantom baseline scan and include these in the installation report. Reproducibility is checked by scanning the spine phantom shipped with the unit 10 consecutive times. The plot screen does not display the coefficient of variation for absolute radiation directly.

Put the results in the QC database if you have not already done so. Select Database. Select Plot. Select HiA.

Plot the data for the 10 scans in step 1. Assure that the SD is 14 or less. Repeat for LoA by repeating steps This result must also be 14 or less. Section 5 5. PART NUMBER Power Inlet Assy. X-Drive Lead Screw Assy. Y-Drive Lead Screw Assy. Ball Bearing Assembly. Figure Figure Figure Figure Figure Encoder Interface. Hi Res Monitor 3. Section 6 6. The scanner instrument contains dangerous voltages, mechanics and heat that may cause serious bodily harm. Refer to Figure and follow these procedures: 1.

Make sure that the system is not in use. Note: It is good practice to ask the operator for permission to shut the system down. The green LED should go off. Remove scanner power by switching the Instrument Power switch to the 0 position. Remove operator console power by switching the Computer Power switch to the 0 position. Remove power to the entire system by setting the Main Circuit Breaker to the 0 position. Remove power from the system by removing the power cord from the facility power outlet.

You must gain access to the inside of the scanner to perform many of these procedures. You can do this by: a Removing the front panel Section 6. Note: You can follow the procedure in Section 6. Eight sets of screws and washers hold the table to the frame. To remove the table, refer to Figure and: 1. Remove the table pad if present. Remove the eight screws and their washers. To install the table onto the scanner frame: 1. Set the table in place on the frame.

Insert the eight fastening screws. Place the table pad on top of the table if previously removed. Note: Be sure to replace the Lexan panel if it is not inserted in the table. To remove the front panel, face the scanner from the front and: 1. Disengage the front panel screw by turning it turn Figure Removing the Table and Front Panel 2.

Slide the front panel to the left to disengage the holding brackets. Tilt out and lift the front panel to remove. Remove the ground strap. To install the front panel onto the scanner unit, refer to Figure and: 1.

Place the front panel onto the frame via the lower holding clips. You must tilt the top of the panel forward to align the brackets properly. Reconnect the ground strap. Tilt the top of the front panel so it touches the top of the scanner frame and slide to the right.

Engage the front panel screw turn. For this procedure, refer to To remove the C-arm, refer to Figure and Figure and: 1. Disconnect the four cables and the cable clamp Figure Feed the cables through the hole below the high voltage power supply and then through the C-arm channel. Note: Place the cables where they will not get damaged. Remove the mounting stud nuts and washers. Remove the ground strap from the ground lug. Top Mounting Screw 2x Brace 2x 2!

Removing the C-Arm top view 7. Remove the brace fastening hardware which secures the C-arm to the Upper-Carriage Assembly. Remove the mounting screws and washers. Lift the C-arm from the Upper-carriage assembly, being careful not to damage the cables. Be sure to clear the cables as they pass through the cutout. Connect the four cables and the cable clamp as indicated. Install the top and back C-arm covers.