Bennett x ray manual

Cabinet Top Cable Assembly. MA Station Figure Auto-Tech Anatom Figure ROI Selection Figure Exposure Factor Salection Edit Menu Procedure Figure Copy Master Verificaion Menu Jable Figure A.

PCB Location Figure Figure C. Stored Energy Module Layout by Mois! Table HFQ Series Figure Mode Selection Fiow Chart Figure Auto-Tech Menu with Modified Techniques. Tube Heating Display HFQ Generator Dimensions High Voltage Tank Connections.

Remote Switch Connection Diagram Figure Bucky Interconnection Diagram. Figure A-C. Cabinet Top Cable Assembly Figure Microprocessor Board, TP3 Figure Utlity Maintenance Menu Figure 6- Figure Calibration SeiectionV Figure MA Calibration Menu: 5 Figure Field Locations. Auto-Tech Anatomical Region Selection Main Program Edit Menu Figure Copy Master Verification Menu Figure System Test Program Selection menu Figure Example Displays for Memory Diag Figure Many options to meet the unique requirements of various treatment techniques.

High-performance system at outstanding value. Chiropractic Radiographic Generators. Powerful, high-quality imaging. Full-featured for general radiographic needs. Ideal for the value-conscious clinic. View The Summit Promise. Bennet X-Ray Service Pillars. Output kVp is selected by the microprocessor prior to the start of x-ray.

Data is loaded into the kVp digital to analog converter on Ad and A8. The following discussion will focus on only one system since the anode and cathode transformers are controlled separately and identically. A KV voltage divider circuit is built into each High Voltage transformer assembly. The KV output is sampled by this divider and compared to the required kVp. Adjustments are made to the system continually to hold the output KV constant for all line variations expected.

Operation of these circuits are as follows: A digital code corresponding to the output kVp is sent to the digital-to-analog converter, Ul, through the HF data bus on Jl. This generates a voltage at TP3 Proportional to kVp.

Slope and offset pots R5 and R2, together with the adjacent resistors, form a voltage scaling network providing the reference voltage at TP2. The actual codes necessary are computed during the digital kVp calibration procedure.

R14 - R16 and C5 form a loop gain compensation circuit. The output of US drives a flip-flop, U6, which generates a two phase output signal at pins 12 and These clock signals trigger dual one-shots in U9, which in turn, connects to the two drivers. This AC signal appears at J to J which will be amplified in A15 and applied to the resonant circuit and then to the high voltage transformer.

These operations occur only during the exposure time. If this is low, there will not be any loop oscillator output and therefore no x-ray exposure. UB is a re-triggerable one shot which has to be triggered every 2. This is decoded in U2 to provide an output pulse train at U, which resets U8, thus continuously enabling the x-ray. During normal system operation, x-ray is terminated at the end of the selected time interval by microprocessor control signals or, when the system is equipped with the optional Automatic Exposure Control AEC , exposure is terminated by the AEC control sensing the level of radiation.

However, x-ray can also be terminated as a result of a malfunction. The sampling of kVp voltages is one example of how exposure conditions are monitored. This is accomplished through the constant comparison of sample voltages in the High Voltage Transformer to a reference voltage.

If the sample voltage is correct, a logic low is generated; if not, a logic high exists and x-ray is terminated. If the sample voltage is correct, a logic low is generated at U3 Pin 8, which is connected to U7, which is, in turn, read by the microprocessor every 2.

However, should a logic high be found to exist, x-ray will be terminated. The microprocessor detects this as a kVp error and indicates the message "KVP? If the problem is in the cathode supply, the message "KVP-C? Generating an excessive kV would also serve to terminate exposure.

Should the sense voltage exceed a preset level, U12 pin 8 or pin 14 would provide a logic low which will hold U9 pin 5 low and disable U9, thereby terminating exposure. This in turn will cause U7 pin 11 to be at a logic low, which is connected to U8 pin 3 as well as U7 pin 9. A logic low at U8 pin 3 will disable U8, causing U8 pin 6 to stay at a logic low and disable U9, thereby terminating exposure. With U9 disabled, U3 pin 8 will be at a logic high, indicating a kVp error.

A digital code Proportional to the required filament current is computed by the microprocessor. U4 pin 14 goes low strobing the data into U2. The reference thus appears on U3 pin 14 and TP3 as a voltage between 0 and -5 volts, depending on the filament current required. An offset voltage determined by RR28 is summed with this reference and inverted, generating at TP1 a final reference voltage for the filament feedback. U1 is a pulse width modulated power supply control circuit.

The output of this circuit at U1 pin 11 and U1 pin 8 controls the invertor transistors Q5 and Q6, which in turn, control the output amplifier Q1-Q4, The output amplifier is configured as a bridge circuit. The primary of the filament transformer is connected in parallel with R24 through J2 pins 4 and 6 or 5 and 6, depending on whether the small or large filament is activated. When U1 pin 11 is low, Q2 and Of are on, so the current flows from the 30V power supply through Q4, through the filament transformer, through Q2 and then through the current sense resistors R12 and R When U1 pin 8 is low, the current flows through Q1, the filament transformer in the opposite direction, Q3, and the current sense resistors.

The voltage across R12 and RI3 is proportional to the filament current. This signal is filtered by R11 and C The filtered voltage is connected to Ul pin 1 and compared to the reference described above. U1 controls the pulse width of the output to control the filament current. One section of U3 senses whether the filament circuit is in regulation and causes the output at U to be at a logic low.

This buffer is enabled when the select lines are set at a code of 3', causing U to be at a logic low. US monitors the sense current through R It compares this to the maximum current allowed in the tube which is set at the factory using R If the maximum current is exceeded U5 pin 1 goes to a logic low causing US pin 8 to be at a logic high , or if U3 pin 7 indicates that the feedback is not working U3 pin 7 goes toa logic high , then the microprocessor will indicate a filament error and turn off the filament supply.

U7 pin 12 is at a logic low for large filament and at a logic high for small filament. Q7 energizes relay K1. The clock pulse occurs when the select lines are set to a "2", causing U to be at a logic low. The AEC sensor chamber detects the x-ray energy that enters the film cassette.

When the x-ray energy on the detector reaches the required amount, the x-ray is terminated. Compatible chambers used with this board function by providing a D. This D. To provide compatibility with various types of chambers, this board can be supplied with a volt power supply for use with chambers that do not have a built-in D. The volt power supply consists of oscillator U10 driving FET Q2, which Provides a switching voltage to the primary winding of transformer, T1.

R48 and R49 sample the output voltage and provide a feedback signal to U10 to keep the voltage constant. These control signals are decoded by latch U2 and decoder U1. U3 pin 8 being low closes switches U4 pins 2 and 3 and U4 pins 14 and U3 pin 14 being low closes switches U4 pins 6 and 7 and U4 pins 10 and Field selection is accomplished by U2 pins 5, 6 or 7 being high, in turn causing invertor U7 pins 12, 13, or 14 to be low, which enables fields 1, 2 or 3, respectively.

The fields can be enabled in any combination. This low level is connected through switch Us to invertor U7. The outputs of U7 U7 pins 17 and 18 reset the integrator in the selected chamber. US is divided into a summing amplifier, a comparator and an anticipator circuit.

The summing amplifier combines the ramp output voltage at TP4 with the anticipator output voltage at TP6. R15 is used to calibrate the circuit for the desired film density. The summed output voltage appears at TP7 and is one input to the U5 comparitor. The voltage is buffered and scaled with OP amp U6.

R32 allows calibration of the reference voltage measured at TP3. R33 allows for voltage offset adjustment of 0 volts, measured at TP2. The Anticipate ramp voltage is summed with the ramp voltage and applied to comparator U5, pin The key to the low input current for this system is the stored energy system. Plus and minus volt high efficiency, maintenance-free batteries are housed in compartments at the bottom of the system.

The positive charger voltage is connected to the battery through J U2 is used as a triac driver which, when activated, turns on the triac, QI, which then charges the battery through the current limiting resistors, 3, R32, and fuse Fl. When the desired battery voltage is achieved, QI turns off. The negative charge voltage is connected to the battery through JI pin 8. This voltage is sensed through the voltage divider R by U3 pin 2 and compared to the The output, U3 pin 1 goes low if the battery voltage goes low, turning on Q4, D9 and the opto coupler U4.

U4 is used asa triac driver, which when active turns on Q3, charging the battery through the current limiting resistors R19, R31 and fuse F2. When the desired voltage is achieved, Q3 turns off. The microprocessor checks for this voltage to be in a preset range. This voltage can be lowered by one of three comparitor outputs going low.

Input power is applied to JI pins 1 and 10 from the main circuit breaker to the transformer primary through F2. When the remote power switch TBI is set in the ON position closed , a ground path is provided for relays Ki and K2 to energize, closing the contacts and allowing input power to be applied to the system transformer T1 via E2 and E4. If the system is left with the power turned on and no x-rays are taken for a period of one hour, the microprocessor will time-out the system: it transmits a SHUTOFF signal logic low to Ji pin 3 energizing relay K3.

Normally closed relay K3 contacts open, removing the ground path from TBI and de-energizing relays K1 and K2 which remove input power from the system transformer Tl.

Relay K3 will then be latched in the energized position. K3 must be de-energized to turn the system power back on. The microprocessor time out system also functions in a similar manner to the board by removing the ground path at J1 pin 2.

The bleeder-resistors discharge the capacitors to remove any stored potential voltage. Normally closed contacts open, disconnecting the bleeder-resistors from the circuit. When the system is powered-off, relays K1 and K2 de-energize, causing the contact to close, providing a discharge path for the capacitors through bleeder-resistors R1 and R2. It provides a VSENSE signal to the microprocessor indicating that the line voltage is at the proper level to take an exposure.

In addition, two LEDs on the top side of the board illuminate to indicate that power is being applied to each capacitor bank. The circuit monitors anode and cathode voltages at the capacitor banks applied toJ1 pins 1 and 6, and pins 7 and 12, respectively.

With power on, a positive voltage from the anode capacitor bank is applied to U1 non-inverting input pin 3 and a negative voltage from the anode capacitor bank is applied to inverting input pin 2. These voltages cause Ul output pin 1 to generate a positive voltage which can be seen at TP1. This positive voltage causes LED D2 to illuminate, indicating that power is applied to anode capacitor bank. The cathode capacitor bank is monitored identically, with the output of Ul pin 7 generating a positive voltage at TP2 and illuminating LED D1.

The summed voltage is applied to U1, inverting input, pin 13 through R16 and potentiometer R J1 and J2 interconnect the board to the microprocessor board and OCP, respectively.

Typically, data from the microprocessor is sent to U1 and U2, the 8-bit buffer registers. The LCDEN signal a clock pulse from the microprocessor is buffered through two NAND gates and transmitted to the clock input of the buffer registers and B clock input of the multi-vibrator.

The two monostable multivibrators function to delay the LCDEN signal, thus allowing for data transfer time between the registers and drivers. Auto-Tech has the capability of recalling up to 72 techniques by storing up to 9 techniques in each of the 8 anatomical regions. Any of the existing x-ray techniques can be edited to suit the individual needs of your practice. For the purpose of this description, the LCD display is divided into 10 sectors as shown in Figure , below.

Each sector is controlled by the corresponding sector key located above or below that sector. Select the anatomical region where the technique is to be stored by pressing the corresponding sector key.

Select the Region of Interest for the particular anatomical region where the technique is located by pressing the associated sector key. To add a new ROI if a blank sector is available press a blank sector key. For example, see Figure To add a new ROI to the blank sector, press sector key 5. Turn the key switch on the rear panel of the OCP once to enter program edit mode.

The selected anatomical region 1 and ROI 6 will be displayed or blank for new ROD in the main program edit menu as shown in Figure Sector keys function as follows: 1. You can name an ROI containing up to seven alphanumeric characters. Blank spaces, the first selectable alphanumeric character before the letter "A", are displayed as a blank in the appropriate space.

Note: TUBE sector selection is disabled for single tube units. Select an mA station to be used by pressing the appropriate up or down. MA sector key to increase or decrease mA, respectively. Possible selections are 1 through There are ten available selections. In general, you should establish a cm range for the selected ROL The cm range is the total thickness range of the desired anatomical part. If the cm range is 10 or less, use 1 as a cm increment. If the range is between 11 and 20, use 2 as a cm increment.

If the cm range is between 21 and 30 use 3 as a cm increment. If the range is over 30, use 4 as a cm increment. Exposure Factor Selection Edit Menu You are now ready to select exposure factors for the selected ROI for each cm selection. These set values can be manually modified for each individual exam, at random without returning to program edit mode.

Repeat step 11 for each cm setting displayed. After the tenth cm setting has been set and next is pressed, the edited ROI x-ray techniques will be stored in memory. After the technique has been stored, the program edit menu will automatically advance to the next ROI for the selected anatomy to be edited. You can continue to edit or exit program edit mode.

If operations accessed from this menu are required, refer to the following section for more information or turn the key switch once again to exit utility mode and return to normal operating mode. Note: Program edit mode can be only be exited when the main program edit menu is displayed as shown in Figure Erom Normal Operating Mode - Tum the key switch twice.

For detailed information, refer to Section 9, Preventive Maintenance and Troubleshooting. Procedure 1. To access the test facility, press the TEST sector key. The Test Utility Menu Figure will be displayed. Press the sector key that corresponds with the test you want to be performed. Test status and messages will be displayed on the LCD. When the test is complete, the Test Utility Menu will be re-displayed. Proceed as follows: 1.

Turn power off and remove the cover panel to access the microprocessor board. To continue with copy procedure:, press YES. Current copy status address locations will be updated displayed in the last LCD segment. To abort the copy procedure, press NO. To continue with copy procedure, press YES. When the procedure is complete, turn power off, remove IC's a8 necessary and re-install cover panel. If a printer is already connected to your system, continue with this step.

Printing will be displayed on the LCD while the printer provides you with a hard copy of all techniques stored in memory. Please refer to Section 6, Calibration for detailed procedures. This reference point is the distance from the tube to the film, which can vary according to the SID, table, wall or bucky selection. The six possible references are: 1. To calibrate a zero reference point for each of the six positions, access one of the applicable auto-tech techniques for that reference point.

Ensure that the tube is at the correct position and the field is clear of all objects, then press the THK REF sector key. Turn the key switch once to return to normal operating mode. Repeat this procedure for each of the positions used at your facility.

When there is a problem, call a Bennett recognized service technician. Do not operate equipment until all repairs are completed. The periodic maintenance is required to maintain the system in proper and accurate working conditions.

If necessary, calibrate according to the procedures in Section 6, Calibration. Test utility routines can be performed if necessary to help isolate potential faults. MA 4 Setting 3 sec. Time 10 msec Reading ae 5 Setting Utility Maintenance Menu 2. Press [TEST]. The following menu will be displayed.

System Test Program Selection Menu 3. To access any of the test utilities, press the LCD sector key that corresponds with the desired test. The system will return to normal operating mode. If you choose to test the memory, it will immediately start to test the ROM read only memory Then the EE Prom electrically erasable programmable read only memory and the RAM random access memory.

These tests will continue until the power is turned off. The number of times each is tested will appear on the display. For each failure that occurs the number in the fourth sector will be incremented. See examples below. To exit memory diagnostic test routines and return to normal operating mode, set the power switch to OFF, then back to ON position. If an error is detected, the OCP will emit two audible tones.

Upon completion of the test, the test meu will be re-displayed. The fifth sector will continue to increment indicating the number of tests completed until the system is tured off. This facility generates a stepped voltage ramp to test Digital to Analog circuits, 1. From the test program selection menu, press [D2A]. Connect a scope to A4-TP3 to verify that a 0 to The ramp should have a 0. Repeat step 3 with the scope connected to A8-TP3. Connect the scope probe to A5-U3-Pin A negative going ramp from Oto