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Preva Dental X-ray System

1. Preva Dental X ray System a Installation and Service Manual 0120 00 02 1577 Rev AD ECN P3447 Attention The equipment must only be installed and operated in accordance with the safety procedures and operating instructions given in this manual and in the User Manual for the purposes and applications for which it was designed Modifications and or additions to the equipment may only be carried out by Midmark Corp or by third parties expressly authorized by Midmark Corp to do 50 Such changes must comply with legal requirements as well as with the generally accepted technical rules It is the responsibility of the user to ensure that existing legal regulations regarding installation of the equipment with respect to the building are observed X RAY PROTECTION X ray equipment may cause injury if used improperly The instructions contained in this manual must be read and followed when operating the Preva Your Midmark Dental dealer will assist you in placing the Preva in operation The Preva Dental X ray System provides a high degree of protection from unnecessary radiation However no practical design can provide complete protection nor prevent operators from exposing themselves or others to unnecessary radiation MIDMARIKX Midmark Corporation 675 Heathrow Drive Lincolnshire Illinois 60069 USA Phone 800 MIDMARK Fax 847 415 9801 midmark com AMI MANSIS Preva Dental X ray System Instal
2. Maintenance Preva 20 Insert the tubehead into the yoke collar Figure 81 21 Feed the connectors and ground wire of the yoke cable through the first spanner nut Figure 82 22 Manually thread the spanner nut on the tubehead shaft Insert a small screwdriver into one of the alignment holes to finish tightening the spanner ring Figure 83 93 Maintenance 23 Feed the connectors and ground wire of the yoke cable through the Spanner wrench 24 Align the three pins on the spanner wrench with the three holes in the Preva Figure 84 Figure 85 25 26 27 28 Figure 86 spanner NOTE Take care not to pinch or cut any of the yoke cable assembly wires Doing so will cause intermittent exposure or no exposures Alignment holes Tighten the spanner nut Carefully remove the spanner wrench NOTE Take care not to damage the connectors Repeat steps 21 through 26 for the second spanner Feed the black connector through the yoke collar NOTE Take care not to damage the connector 94 lt Maintenance Preva Figure 87 Figure 88 Figure 89 29 Feed the white connector through the yoke collar NOTE Take care not to damage the connector E 4 b 30 Feed the ground wire through the yoke collar NOTE Take care not to damage the connector 31 Re attach the two ground cables that were removed in Step6
3. 8 1 Volts pe Volte De TPC ELLs T Comon BEYER 4 12 Volts DC RC 1328 B MIDMARIK 77 Troubleshooting Preva No 1 Filament 1 Logic Board measure voltages at TP1 8 1V and 24V Use Produced TP8 or TP10 as Common Return If any of these voltages are not present after power is applied next check voltages on the Power Supply Board 2 Onthe Power Supply Board Figure 58 use TP2 as a common test point to check TP1 24 volts DC and TP3 8 1 volts DC Then use TP5 as the common return to check TP4 for the presence of 12 volts DC as shown in Figure 57 Should any of these voltages not be present replace the Power Supply Board Use TP8 or TP10 for Common Return when measuring DC voltages d BEEBE BEES BEER ERE RPE EWE RE RRR RE RRP RR EPR RRR eee eee v doy Am 1058 21300 1257 b4 a Figure 57 Logic Board 30 08160 78 Troubleshooting Preva 24Volts DC tat Volts DC 8 1 Volts DC 4 e n E T ap a 5 12 Volts D LH LIPS E E 12 Volts cuu Ee ADM DC Common Figure 58 Power Supply Board 30 08041 79 Troubleshooting Preva No X ray Produc
4. Cable Assy H1 15 1M09016 08 Lug Logic PCB 30 P0016 Preva Gray 30 P0053 Preva White 30 P0088 Preva 2 0 Wall Mount Cover H1 63 M09016 47 X Screws 30 P0019 Preva Gray 30 P0055 Preva White Control Insert For Preva 2 0 30 08155 Power Hub Figure 104 Control Unit Assembly 108 MIDMARI lt Maintenance Preva Handswitch 30 A2040 Gray 30 A2040 W White Handswitch Assy E1 19003 Replacement Switch for Handswitch Assy 30 P0025 Gray 30 P0072 White Handswitch Hook Figure 105 Hise E1 13005 Switch Coil Cord 109 MIPMARIC Specifications Preva Specifications Preva Dental X ray System Line Voltage Line Load Tube Potential Tube Current Irradiation Time Minimum Source to Skin Distance Focal Spot Operating Temperature Storage Temperature Maximum Altitude X ray Beam Dimension Humidity Range Operation amp Storage AC 100 V to 250 V 50 Hz or 60 Hz 250 V UL Recognized It is recommended that branch circuit does not exceed 15A 60 kV 65 kV 70 kV 4 mA 5 mA 6 mA 7 mA 7 mA is not available at 70 kV 20 ms through 25 8 inch 20 cm 12 inch 30 cm 0 4 mm per IEC 60336 50 F to 95 F 10 to 35 31 F to 150 35 C to 66 C 12 000 ft 3 657 m Diameter of 2 72 inches 7 cm at the end of the 7 inch Cone Cones with smaller diameter or rectangular beams are available 10 to 80
5. 1 21 1 13028 Line Cord Not Shown 1 125 lt Appendix Preva Appendix B Electronics Block Diagram Operator Panel Fil Xfmr 5 HV PCB E Monitor PCB Power Supply PCB Filament Feedback Control mA kV Fil KV Control Logic PCB Operator Panel Buttons Exposure Key LCD Display Figure 143 Electronic Block Diagram 126 MIDMARIC
6. 65 Troubleshooting Preva Troubleshooting Electrical Performance Issues Contact Support General Information Questions should be directed to Midmark Technical Support Phone 800 MIDMARK Fax 847 415 9801 imagingtechsupport midmark com Test Equipment Electrical measurements require specific meter test probes Use small test clips such as Pomona Electronics Minigrabber Test Clip Model 6248 or Radio Shack Mini Hook Adapters catalog 270 334 or the equivalent Replacement Parts e Kit Power Supply Board 30 A2155 e Logic Board 30 08160 e Operator Panel Board 30 08054 25 foot Communication Cable E1 13003 6inch Communication Cable E1 13004 e Rocker Switch E1 19026 e Yoke Cable Assembly 30 08071 Tubehead Assembly 30 A1027 e Ribbon Cable Assembly 30 08072 Note f you replace the Operator Panel Board 30 08054 you must re program customized technique factors as explained in the System Configuration section of this manual f you replace the Logic Board 30 08160 or the Tubehead and the firmware revision 1 5 0 or less you must recalibrate the system Please contact Midmark Technical Support for instructions CAUTION The Preva system has the capacity to store electrical energy during operation and after the system has been turned off e The Preva system will store energy for approximately three minutes after removal from power lines Before attempting service within the system obser
7. Installation Procedures Preva Install the Articulating Arm Brake Assembly Figure 21 Installing the Hex Nut and Set Screw Figure 22 Adjusting the Articulating Arm Brake Assembly Locate the Articulating Arm brake assembly 30 A2068 Insert the M6 x 25 mm long set screw as shown in Figure 21 Using a 3 mm Allen wrench tighten the screw fully than back off 1 4 turn and secure with the hex nut Using a 3 mm Allen wrench install the Articulating Arm brake Tighten screws until the Articulating Arm brake comes into contact with the shaft of the Articulating Arm If additional friction is required to prevent drifting turn the two screws evenly 1 turn at a time until drift stops as shown in Figure 22 Hex Nut and Set Screw Articulating Arm Brake amp Screws 33 Installation Procedures Preva Connecting the Cables Connecting 1 Connect the two Articulating Arm cables to the Horizontal Arm cables as shown in the Figure 23 and Figure 24 2 Once the connections are made dress the cables and push them into the opening in the Horizontal Arm Articulating and Horizontal Arm Cables Figure 23 Connecting the Articulating Arm and Horizontal Arm Cables 34 2124 Installation Procedures Preva Figure 24 Connecting optional Integrated Sensor Cable Connectin me Horizontal Verify that line power is disconnected before proceeding Arm Cable
8. 95 MIIDNIARI Maintenance Preva Figure 90 Figure 91 Figure 92 32 Connect the black and white connectors that were disconnected in Step 5 pee 33 To ensure correct operation and to prevent damage to the yoke cable assembly perform the following steps 33 1 Point the tubehead down 33 2 Check that the large Phillips head screw is at the 9 o clock position and that there is a natural loop in the cable harness Large Phillips head screw at the 9 o clock position lt N Oc j There should be a natural loop in the cable harness 34 Mount the yoke cover that was removed in Step 4 p pem 35 Check to ensure the wires are not binding when you rotate the tubehead completely clockwise or completely counter clockwise The cabling should expand and contract cleanly and evenly without any binding 96 MIIDNIARI Maintenance Preva 36 Place the cap back on the tubehead Figure 93 37 Proceed with the automated calibration found on page 65 if Logic PCB firmware revision is 5 0 or lower 97 MIDMARI lt Maintenance Preva Mechanical Adjustments Determining the Necessary Adjustment Tubehead Movement Horizontal Arm Adjustment Figure 94 Tightening the Brake The balance and friction of the Articulating Arm and the friction of the Tubehead are initially set at the factory During the installation process check the balance and friction
9. Cone eph 30cm 20cm 99cm Figure 3 Cabinet Mounting Dimensions 82 reach not recommended for cabinet mount MIDMARK Installation Options Preva i i 33 7 8 A i 13 5 8 21 86 5 8 35em 220 03 CM 1 2 21 5cm see note 1 38 58 40 Xx 39 P7015 P 24 5 9 With ize Winery 98cm 62 5 30cm 20cm P7016 P34 5 8 88 cm Gone Cone 7017 44 5 8 114 4 7018 50 5 8 128 5 Retracted add 5 12 7 cm for Two Stud Wall Mount i 5 0 E 4 5 8 n 44 75 see note 2 see note 3 48 39 121 92 Figure 5 99cm te 4 Extended B Position Wall or Cabinet Mount With 12 30cm cone With 8 20cm cone To handle note 2 P7015 P 52 1 2 133ote 3 P7015 P 56 1 2 143 5note 4 P7015 P 70 3 8 cm cm 178 5 cm P7016 P62 1 2 159 cm P7016 P66 1 2 169 cm P7016 P80 3 8 204 cm P7017 P 72 1 2 184 cm P7017 P76 1 2 194 5 cm P7017 P90 3 8 229 5 7 40 70 4 2 4A400 nm 27740 DON 4 n NDNA E cm MIIDNIARIC Installation Options Preva 18 45 72 with Compact Horizontal Arm 14 28 71 12cm with Short Horizontal Arm 24 38 96 52cm with Long Horizontal Arm 34 7 121 92 Figure 6 Retracted Position for a Cabinet 1 2 Cabinet Outline Mount 1 27 MIIDMARIC Installation
10. Installation Procedures Preva Brake Assembly Figure 19 Installing the Brake Assembly 31 Installation Procedures Preva Installing the Articulating Arm and Tubehead Assembly Install the The Tubehead and Articulating Arm are installed as a single unit Articulating Arm 1 Remove the top level packing material from the shipping carton to gain and Tubehead access to the Articulating Arm and Tubehead Assembly Do not remove the cardboard tube enclosing the cable wires but remove the red tag Remove the Articulating Arm and Tubehead Assembly from the shipping carton Assembly 2 CAUTION Do not remove the tie holding the Articulating Arm closed Removing the tie will cause the Articulating Arm to spring open potentially causing personal injury Note Do not lubricate the shaft of the Articulating Arm or the bearings in the Control Unit 3 Position the Articulating Arm above the Horizontal Arm 4 Carefully route the cardboard tube with the arm cable plug through the opening in the Horizontal Arm 5 Insert the shaft of the Articulating Arm into the opening in the Horizontal Arm as shown in Figure 20 6 Press down until the shaft is completely seated in the Horizontal Arm 7 Remove the cardboard tube to free the wires Discard the cardboard tube 8 Untie the Articulating Arm and remove the plastic covering Figure 20 Installing the Articulating Arm and Tubehead Assembly 32 MIDMARI lt
11. f no kV is produced go to the procedure No kV Produced If no is produced go to the procedure No mA Produced no I is produced go to the procedure 1 Filament Produced On the Power Supply Board observe that the power supply indicator D1 1 350volts DC is illuminated as shown in Figure 52 Illumination represents proper stored energy for an exposure If this indicator is not illuminated it will be necessary to replace this board On the Logic Board measure voltages at TP1 8 1 and TP9 24V Use TP8 or TP10 as Common Return If any of these voltages are not present after power is applied next check voltages on the Power Supply Board On the Power Supply Board use TP2 as a common test point to check TP1 24 volts DC and TP3 8 1 volts DC Then use TP5 as the common return to check TP4 for the presence of 12 volts DC as shown in Figure 52 Should any of these voltages not be present replace the Power Supply Board If each voltage is present check other voltages on the Logic Board On the Logic Board measure between TP8 or TP10 the Common Return and TP6 kV Program This voltage should be between 3 and 4 volts DC If this voltage is not present replace the Logic Board If this voltage is correct inspect the condition of the ribbon cable between the Power Supply Board and the Logic Board If the cable is undamaged and seated properly replace the Logic Board Check the condition of the c
12. non condensing 110 MITDINVIATAIK Specifications Preva Ad Le Nee Toshiba Tube Rating 0 1 10 Charts Time Tube Current mA 111 Specifications Preva mA 10 9 8 7 6 5 4 3 2 1 J Figure 107 Kalong Tubsifiadng 0 50 100 150 200 250 300 5 Charts Thermal Characteristics Chart 112 MILMARIC Appendix Appendix Assembly Instructions for DC Mobile Unit Tools Required 3 8 square drive hex key 10 mm 3 8 square drive hex key x 6 inch extension 3 8 square drive ratchet No 1 Phillips screwdriver 7 mm nut driver Small flat blade screwdriver 4 mm hex key 5 mm hex key 1 Open the box from the top side FIGURE 108 2 Remove all transportation screws from the base of the crate Qty 10 FIGURE 109 113 Appendix Preva 3 Lift the shipping box and separate from the crate There are two layers of parts Separate the top layer and place on the floor or remove each piece individually NOTE This is a two person job Take extra care when handling the articulating arm assembly to avoid any damage to the tubehead FIGURE 110 4 Cut the transportation band from the lower layer that holds the mobile base FIGURE 111 114 Appendix A Preva 5 Remove top cover of control unit by removing screws located at the base of the cover FIGURE 112
13. 30 08041 This condition will exist if the kV or mA produced is out of tolerance To address this issue 1 Inspect the condition of the high voltage circuit by operating the Preva in the diagnostic mode Confirm incorrect kV or mA 2 nspect the Preva s internal horizontal and articulated arm wiring Repair as necessary If wiring is intact and the firmware revision is 5 0 or less attempt system recalibration If greater replace the Logic PCB Assy 30 08160 4 If calibration cannot be achieved the problem may require replacement of the tubehead assembly Contact Midmark technical support for further assistance 5 Checkif D14 DIAG LED Logic Board is on If so check that DIP owitch 2 J11 Logic Board is in the correct position for the brand of X ray tube in the unit The label on the tubehead will indicate either Toshiba or Kailong DIP Switch 2 should be in the OFF position for mn Ie 71 Troubleshooting Preva Toshiba ON for Kailong 72 MITDINVIATAIK Troubleshooting Preva No X ray Produced but Exposure Indicators Detected No kV Produced When no X ray is produced the Preva may still operate the exposure indicators The procedure to troubleshoot a no X ray condition depends on which exposure indicators are detected 1 2 3 Activate diagnostic mode as explained in the System Configuration section of this manual Take an exposure Follow the appropriate procedure below
14. For a series connection connect the wires as shown in Figure 42 green 2 C black 2 yellow 2 56 Optional Installation Procedures Preva Figure 42 Series Switch Configuration 11 12 13 2 green 3 red 2 Make sure the two gray wires from the pushbutton switch are connected to terminals 1 and 2 of J2 Screw the inner section of enclosure 1 to the junction box using the two screws provided If the cable is routed on the surface of the wall make sure it sits in the notch on the bottom of the enclosure Confirm that no wires are being pinched between the junction box and the enclosure Hook the outer section of the enclosure onto the inner section at the top Push the wires all the way into the enclosure and fasten the two pieces at the bottom with the 6 32 x 5 16 inch screw Cut the handset connector from the end of the cable that will connect to switch enclosure 2 and strip about 1 of the white jacket Strip 4 inch of insulation from each of the conductors Connect the cable conductors to terminal block J1 on the PCB of switch enclosure 2 as shown in Figure 40 the same as the single switch configuration Make sure the two gray wires from the pushbutton switch are connected to terminals 1 and 2 of J2 Screw the inner section of enclosure 2 to the junction box using the two screws provided If the cable is routed on the surface of the wall ma
15. Preva Figure 13 Two level Carton Packing List Part Number 30 A1028 30 A1025 30 A2076 30 P0029 30 A2046 30 A2156 30 A2077 30 A2040 E1 13052 30 A2195 30 A2221 E1 13004 E1 13003 30 A2218 30 A2071 30 A2073 30 A2074 30 A2164 Options E1 13049 30 08101 30 A2044 30 A2198 22 11466 22 11467 30 A2099 Description Articulating Arm and Tubehead Assembly Control Unit Assembly Operator Panel Operator Panel Mounting Cradle Preva Mounting Hardware Kit Preva Plastic Covers Brake Kit Two Stud Mount Assembly Optional Handswitch Assembly Optional Line Cord 16 3 6 Wide Modular BLD 70 mm Cone Modular BLD 35 x 45 Cone Cable 8 Cond 0 5 ft Cable 8 Cond 25 ft Preva Documentation Kit Extension Arm Long Extension Arm Short Extension Arm Compact Extension Arm Extra Long 8 Cond RJ45 to RJ45 50 ft Doorbell Switch Lighted Doorbell Switch 8 inch Rectangular Cone 8mm Adjustment Wrench Fluorescent Screen 4x4 Mount Kit Quantity Note Shipment Contains One of the Following Extension Arms Per Order 1 1 1 1 20 Installation Procedures Preva Installing the Control Unit on a Single Wood Stud Wall Mark and Drill Control Unit Mounting Holes WARNING UNDER NO CIRCUMSTANCES SHOULD THE 82 INCH 208 CM REACH SYSTEM BE ATTACHED TO A WALL IN THE SINGLE STUD CONFIGURATION PLEASE DIRECT ANY QUESTI
16. 160 0 640 0 320 0 320 0 160 Bicuspid 8 Bitewing MIDMARK Maintenance Preva Arm and Tubehead Figure 100 Arm and Tubehead 30 P0031 Gray gt a 30 P0061 White Pivot Joint Cover Male 30 P1024 Gray 30 P1024 W White 30 P0030 Gray 7 Articulating Arm amp Yoke 30 P0060 White Assy Pivot Joint Cover Female 30 P0014 Gray 5 30 P0063 White Pivot Joint Cover 2 30 0033 Gray 30 P0063 White Pivot Joint Cover Female 30 P0027 Gray 30 P0027 W White gt Tube Head Assy lA foo Gray 30 A2083 W White Yoke Assy 30 P0034 Gray 30 P0064 White Pivot Joint Cover Male ase O Yoke Coble Assy 30 A2195 70 mm Cone 30 F0003 G Friction Washer 30 P0042 9 ronis Harness Clamp 30 M0017 30 P0067 White Friction Nut Yoke Cap 104 AMIIm PA ii Maintenance Preva Horizontal Arm Figure 101 Horizontal Arm Art Arm Brake 30 A2068 30 A2074 Preva Gray 30 A2074 W Preva White 30 A2210 Preva 2 0 Gray 30 A2210 W Preva 2 0 White Extension Arm Assy Compact 30 A2073 Preva Gray 30 A2073 W Preva White 30 A2211 Preva 2 0 Gray 30 A2211 Preva 2 0 White Extension Arm Assy Short 30 A2071 Preva Gary 30 A2071 W Preva White 30 A2212 Preva 2 0 Gray 30 A2212 W Preva 2 0 White 30 A2164 W Preva White Extension Arm Assy 3
17. Control Unit bearing parallel to the wall Level the Control Unit Tighten the upper and lower screws After the Preva is installed slide covers on the wall plate and fasten with the provided 8 screws H1 64 S1 7050 01 29 lt Installation Procedures Preva Installing the Horizontal Arm and Brake Assembly Installing the 1 Horizontal Arm and Brake Assembly 3 4 6 Locate the Horizontal Arm in the top level of the shipping carton Remove the Horizontal Arm from the shipping carton Do not remove the cardboard tube around the wires but remove the red tag Insert the cardboard tube snugly into the shaft of the Horizontal Arm Note Do not lubricate the shaft of the Horizontal Arm or bearings in Control Unit Insert the cardboard tube enclosing the wires into the opening in the top of the Control Unit Insert the Horizontal Arm completely into the Control Unit as shown in Figure 18 Ensure that the Horizontal Arm is firmly seated in place Remove the cardboard tube to free the wires Discard the cardboard tube Note Do not make the wire connections at this time Locate the brake assembly 30 A2024 in the kit pack 30 2049 or 30 A2156 As shown in Figure 19 install and loosely tighten the brake assembly in order to put a small amount of drag on the rotation of the Horizontal Arm and to keep the Horizontal Arm from lifting out Figure 18 Installing the Horizontal Arm 30
18. Exposure Circuit Enabled Figure 60 Power Supply Board 30 08041 MIDMARIK 81 Troubleshooting Preva High voltage High voltage breakdown is characterized by a loud snap sound during an Breakdown exposure request 1 Onthe Power Supply Board measure the voltage across TP5 the Common Return and TP8 350 volts DC as shown in Figure 61 This voltage will be acceptable if measured between 330 and 390 volts DC Values above or below this number indicate the need to replace the Power Supply Board 2 voltage is correct inspect the condition of the cabling between the Power Supply Board Logic Board and Tubehead Assembly CAUTION High voltage present Of particular importance are the conductors held by the black connectors These conductors transmit the feedback values from the Tubehead Assembly and directly affect the control of power to the Tubehead Assembly Connections for this cable begin with controls at J1 of the Power Supply Board and J4 of the Logic Board As shown in Figure 54 an internal set of connections will be accessed below the distal side of the horizontal arm and at the inside top of the Tubehead Yoke The final set of connections is accessed by removing the Pivot Cap located at the attachment point of the Tubehead to the Yoke 3 If the cabling is found acceptable select 1 5 seconds of exposure time and placing a DC voltmeter on TP8 or TP10 the Common Return on the Logic Board measure the feedba
19. MAINTENANCE DO HOP ANDE APER 87 PREVA TUBEHEAD REMOVAL INSTRUCTIONS dee re eas T rede ve tre ove ect dus 87 PREPROGRAMMED EXPOSURE TIMES cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccecccccceccccccecccccceccs 103 ABMOTNB RUBEHEND Sos PE LOU 104 RORZONTALAR M 105 MOUNTING PLATES saree a cares ANES 106 OPERATOR DR E TTC 107 eina uvm ono 108 MICI E RR ERREUR NS eR EE NO 109 SPECIFICATIONS IDEO 110 PREVA DENTAL X RAY SYSTE M cst A visi nie s De 110 ea wise eh
20. Operator Panel Mount the Operator Panel into cradle 121 Appendix Preva 23 Attach the remote switch holster by removing the adhesive backer and attaching to the frame FIGURE 136 122 Appendix Preva Replacing the Power Cord Tools Required FIGURE 137 1 Remove the six 6 screws securing the cover FIGURE 138 2 Remove the EMI Shield acei FIGURE 139 158 IMIIDMARI Appendix Preva FIGURE 140 4 Slide the strain relief E1 22031 out of its slot FIGURE 141 6 Reverse the procedure to install the new power cord 124 MIDMARI lt Appendix Figure 142 Mobile Unit Assembly See Fig 104 for ine Arm amp Head Assy parts list Mobile Assembly Parts List Item Part Number Description Qty 1 30 A2093 Velcro Strap 1 2 H1 15 M16020 10 Screw 2 3 30 2111 Mobile Stand Handle w Grips 1 4 30 2076 Operator Panel see Figure 103 1 5 H1 61 M13008 01 Screw 2 6 30 M3010 Cradle 1 7 1 13029 8 Cond RJ45 to RJ45 2m 1 8 30 M0045 Column 1 9 1 61 5008 01 Screw 5 10 H1 P2 M04000 01 Washer 5 11 30 0046 Column Screw 1 12 30 S0036 Caster Swivel w Brake 2 13 30 S0035 Caster Swivel 2 14 30 A2078 Mobile Stand Base 1 15 30 A1032 Control see Figure 104 1 16 30 08098 Switch Assy Preva Mobile Stand 1 17 30 A2040 Remote Control Switch Assy 1 18 1 63 9008 17 Screw 2 19 30 P0017 Access Cover 1 20 30 2109
21. Preva At Power Up Continuous Beep Backlit Display No Display Characters No Ready Light Power Supplies OK At Power Up Continuous Beep with Normal Display At Power Up Buzzing Noise is Heard 1 Adjust the selected exposure time kilovoltage or tube current to produce an acceptable image If necessary reprogram the techniques factors as explained in the System Configuration section of this manual 2 Verify the kilovoltage and tube current during an exposure using the diagnostic mode as explained in the System Configuration section of this manual Alternatively you may employ a non invasive meter to evaluate kilovoltage and exposure time 3 Inspect the condition of the remaining imaging chain components such as the film chemistry and processor or the condition of the X ray sensor and computer 4 Check for pulsing output with fluorescent screen If this is occurring replace the Logic Board 5 Light image can be caused by the Logic Board This is characterized by a short pulse of exposure as viewed with a fluorescent screen Replace the Logic Board 6 Full fluorescence with light image may require adjustment of the preprogrammed techniques Replace the operator display board Replace the Operator Display Board 30 08054 or the Logic Board 30 08160 or both Replace the Logic Board 30 08160 Replace the Logic Board 30 08160 70 AMI Im PAS ie Troubleshooting Preva X ray Indicator No
22. Reverse the template for dual stud installations Figure 8 Mounting Template ZH CAUTION When installing the intraoral system combined with the 82 inch 209 centimeter reach arm wall fabrication and attachments to the building structure must be capable of withstanding a load moment of 920 ft Ibs 127 Kg m CAUTION Lag screws are not intended to be used as an attachment method for metal supports such as those found in center island pass through cabinets Midmark provides machine screws large flat washers and nylock nuts to use when fastening the system to metal supports 13 MIITOINVIATIK Installation Options Preva Single Wood Stud Wall Solid Wall or Reinforced Wood Cabinet Figure 9 Wood Wall Stud Mount The Control Unit should be located at a height of 39 inches 99 cm from the floor to the bottom of the control mounted on the wood stud as shown in Figure 9 The large range of travel of the Articulating Arm provides some flexibility in the vertical position Two mounting holes are provided Refer to the supplied mounting template shown in Figure 8 for specific locations In order to mount to a solid masonry type wall the same mounting holes and mounting template as the single wood wall stud are used The installer must supply appropriate fasteners The power supply 2x4 junction box should be mounted to the left of the mounting stud at the appropriate height as indicated in the mounting templa
23. Unit or mounted remotely on a wall On Control Unit The Operator Panel snaps on to the front of the Control Unit Installation of the Operator Panel on the Control Unit may require the purchase and use of the coil cord hand switch option 30 A2040 Remote Operator The Operator Panel is mounted on the wall remote from the Control Unit If the Operator Panel is mounted separate from the Control Unit a supplied cable must be run from the Control Panel to the Operator Panel Where local codes require a separate 2x4 junction box should be mounted to the left of the mounting stud above the power supply box Refer to the supplied mounting template for specific location 18 MITDINVIATAIK Installation Procedures Preva Installation Procedures Preparing to Install the Preva Check Pre installation Requirements Gather Tools Installation Time Open the Shipping Carton Prior to beginning the installation be sure that all pre installation requirements have been completed This includes confirming that the wall support requirements are adequate for mounting the unit and that the electrical power requirements and wire locations are proper Note Midmark recommends that the Preva Dental X ray System be connected to dedicated wiring and permanently grounded The installer must determine the suitability of using a line cord at the time of installation ensuring proper grounding technique Items needed for all types of mounts
24. already assembled to the Articulating Arm Warning There is a small hole in the plastic handle covering the back of the Tubehead Under no circumstances should this hole be blocked as it provides an air vent to allow the Tubehead oil to expand and contract as the unit is operated The Articulating Arm provides the articulation support for the Tubehead and the reach and coverage of the Tubehead to the patient The Horizontal Arm helps provide the necessary reach for the VetPro DC It pivots around a shaft inserted in the top of the Control Unit and contains an access cover to connect the cable from the Horizontal Arm to the Control Unit It is available in four lengths on wall mount units providing reaches of 56 66 76 and 82 inches 142 167 193 208 cm The cone establishes the distance from the X ray tube to the patient s skin It provides positioning assistance and collimates the X ray beam The remote control switch is used to make exposures in addition to or replacing the use of the exposure button The Preva is available as both a wall mount and mobile unit See Appendix A for the installation instructions for the mobile unit The Preva Dental X ray System should only be installed and serviced by approved Midmark dealer personnel Contact Midmark Corporation at 800 MIDMARK if you need assistance locating an approved dealer When using lag screws as the method of attachment it is imperative to consider the full scope of the
25. and adjust by tightening to the point where the articulating arm does not drift when you lightly push the arm FIGURE 120 FIGURE 121 14 Pry apart the Isolator containing the connectors for the cables Connect the power cables white connectors FIGURE 122 FIGURE 123 15 Connect the feedback cables black connectors Insert cables into the Isolator one on each side of the divider and snap shut FIGURE 124 FIGURE 125 16 If the unit is a Preva 2 0 Sensor ready connect the USB cables Insert cables into the post 118 Appendix Preva FIGURE 126 FIGURE 127 FIGURE 128 119 MIDMARIK Appendix Preva 18 Remove the screw that locks down the Logic board Swing out the Logic Board and connect the three connections as shown below e A Black connector Feedback from tubehead e B White connector Power to tubehead Cat5 network cable USB for Sensor ready units E Attach white connector here connector here FIGURE 129 19 Attach the control unit cover il FIGURE 130 120 MIDMARI lt Appendix Preva FIGURE 131 FIGURE 132 FIGURE 133 FIGURE 134 FIGURE 135 20 Feed the Cat5 cable through the Operator Panel Cradle Feed remote exposure cable through the bottom of cradle NOTE Allow a few coils of slack inside for strain relief Attach the cradle with supplied hardware 21 Connect Cat5 cable and remote switch cable to the
26. correspondingly longer fastener must be chosen 5 Drill two 5 32 inch diameter holes using the installation guide as a drill template MIDMARIK 22 Installation Procedures Preva 6 Attach the wall mounted control leaving the installation guide in place MIDMARIK 23 Installation Procedures Preva Remove Control Unit Front Cover Mount and Level the Control Unit pO I9 Open the shipping carton and locate the Control Unit in the first level of the carton Remove the Phillips screw from the front cover of the Control Unit Carefully remove the front cover Place the front cover and the screw in a safe location for later reassembly oelect the 3 8 x 3 long lag screws 30 H0006 and washers 30 H0008 Note For concrete walls the installer must supply the appropriate mounting bolts Put a lag screw and washer through the upper mounting hole of the Control Unit Place the Control Unit on the wall and loosely tighten the upper mounting bolt Put the remaining lag screw and washer through the lower mounting hole of the Control Unit and loosely tighten Be sure that the power wire extends through the opening at the bottom of the Control Unit Place a level on the Control Unit bearing parallel to the wall as shown in Figure 14 Level the Control Unit Tighten the upper and lower lag screws to 14 18 ft lbs 2 0 to 2 5 m kgs Pre drill a hole for a 12 wood screw below the lower lag screw as
27. cover alignment Replace the screw on the front cover of the Control Unit Place the cover plate over the top opening and the small trim cover over the bottom opening on the front cover of the Control Unit Locate the Operator Panel in the top portion of the shipping carton Connect the other end of the remote cable to the right plug as viewed from the back on the bottom of the Operator Panel Carefully dress the white cable back into the wall Snap the Operator Panel to the mounting cradle as shown in Figure 35 44 AMI Im PAS ie Installation Procedures Preva Figure 35 Snapping the Operator Panel to the Mounting Cradle 45 MIDMARI lt Installation Procedures Preva Installing Plastic Covers The end cap for the Horizontal Arm is shipped in the packet of plastic parts and is put on as part of the installation procedures End caps for the Articulating Arm are shipped installed but are removable to perform mechanical adjustments The cable access cover is placed over the cable connection underneath the Horizontal Arm Cover locations are shown in Figure 36 1 Place the plastic cover from the packet on the end of the Horizontal Arm 2 Install the cable access cover over the Horizontal Arm opening using two Phillips flat head screws Figure 36 Cover Locations AG MIPMARI lt C Installation Procedures Preva Preva Operator Panel Using the Operator Panel Power On When the Preva Dental X ray Syst
28. e Stud finder Bubble level torpedo level Masking or other tape for placing the mounting template on the wall Awl Drill driver and drill bits appropriate to type of wall mounting Metric Allen wrench set English inch Allen wrench set ocrewdrivers flat blade and Phillips Torque wrench 0 40 ft Ibs 0 5 53 m kgs or equivalent Sockets and ratchet driver appropriate to type of wall mounting Fluke model 73 DVM equivalent or better omall test clips such as Pomona Electronics Minigrabber Test Clip Model 6248 or Radio Shack Mini Hook Adapters catalog 270 334 Items needed only for the metal stud wall mount e 11 inch hole saw Dry wall saw Y inch diameter 12 inch long drill bit Two 4x4 wood studs Drywall screws The Preva Dental X ray System has been designed to be installed by one person in less than one hour assuming that all pre installation requirements have been met The Preva Dental X ray System is shipped in a convenient two level carton as shown in Figure 13 The first level contains the items needed for the first part of the installation including the Control Unit Operator Panel Horizontal Arm mounting template documentation cables and packets containing the mounting hardware brake assembly plastic covers and additional hardware The Articulating Arm and Tubehead Assembly are in the second level of the shipping carton where they can remain until installation 19 AMI Im PAS ie Installation Procedures
29. for future use Install the Wall In the dual wood wall stud installation the Control Unit is bolted to a wall plate Plate 30 A2042 that has been installed on two wood studs wall plate shown in Figure 16 is packaged separately from the Preva 1 Select the 3 8 x 3 long lag screws 30 H0006 and washers 30 0008 Put the lag screws and washers through the mounting holes on the wall plate and loosely tighten Be sure that the power wire extends through the opening in the wall plate Level the wall plate Tighten the lag screws to 14 18 ft lbs 2 0 to 2 5 m kgs CAUTION Do not over tighten the lag screws Over tightening the lag screws will damage the wooden stud and reduce the holding force 26 MITDINVIATAIK Installation Procedures Preva Figure 16 Mounting Plate for Dual Stud Wall Mounts Remove Control Unit Front Cover Mount the Control Unit Open the shipping carton and locate the Control Unit in the first level of the carton Remove the Phillips screw from the front cover of the Control Unit Carefully remove the front cover Place the front cover and the screw in a safe location for later reassembly Select the 5 16 18 x 7 8 long socket cap screws H1 15 S23088 01 and washers H1 NA S12000 01 Put the one screw and washer through the upper mounting hole of the Control Unit Place the Control Unit on the wall and loosely tighten the upper screw Put the other screw and was
30. kV to be adjusted 8 Press Enter to highlight the time to be adjusted 9 Observe normal radiation protection procedures in preparation for the following steps 10 Make an exposure 11 Observe the feedback values To adjust kV 1 Press the Up switch to activate the Adjust feature This displays the Current kV Modulation Level screen 2 Press the Up or Down switch while observing the Counts indicator 3 Adjust the Counts in small increments 4 Press Enter to exit and return to operational mode 5 Make an exposure and observe the feedback 6 Repeat steps 1 5 until the desired kV level is reached Once completed it is necessary to deactivate the calibration session 1 Press and hold the Tooth Selector switch and the Patient Size Selector switch for five seconds You will see the Menu Options screen Figure 44 Press the down arrow to highlight the CONFIGURE UNIT option and press Enter This displays the Configure Unit menu Figure 47 Press the down arrow to highlight the Set Configuration option and press Enter You will see the Set Configuration menu Figure 48 Press the down arrow to highlight the Diagnostic Mode Off option and press Enter This displays the Configure Unit screen Press the down arrow to highlight the Exit option and press Enter This displays the Menu Option screen Press the down arrow to highlight the Exit option and press Enter This returns the system to operational mode MIDMARI lt
31. not use this procedure immediately after Tubehead replacement Refer to Page 65 for the Calibration procedure X ray tubes that sit dormant for several months can become electrically unstable To remedy this condition it is recommended you perform a new tube seasoning procedure This process establishes stable high voltage operation and will ultimately extend the life of the tube Repeat this procedure before returning to normal operation any time the system has been unused for more than two months 1 Verify system operation 2 Energize the system 3 Select 60 kilovolts kV 7 milliamperes mA and the exposure time of one second Make five exposures at this level observing the normal cooling time Select 65 kilovolts 7 milliamperes and the exposure time of one second Make five exposures at this level observing the normal cooling time Select 70 kilovolts 6 milliamperes and the exposure time of one second Make five exposures at this level observing the normal cooling time Your Responsibilities As An Installer Service Engineer Verification of machine performance after installation must be performed according to the guidelines identified in the System Function Checklist which may be found in the User Manual or the Installation and Service Manual on page 49 Verification of machine performance after maintenance or repair must be performed according to the guidelines identified in the System
32. 0 A2213 Preva 2 0 Gray Long 30 A2213 Preva 2 0 White 30 08069 Extension Arm Assy Extra Long 30 A2164 Preva Gray Extension Arm Cable It Compact gt 3008058 7 2 f g Extension Arm Cable 4 3008067 x Extension 30 08142 Arm Cable Extension Long Arm Cable 30 P0032 Gray 30 P0062 White Extension Arm 1 63 9008 17 Cover Mounting Screws End Cap 1 653 09008 17 30 P0017 Gray Cover Mounting Screws 30 P0054 White 30 42068 Access Cover Articulated Arm Brake 30 A2068 Articulated Arm Brake 105 MIRMARIC Maintenance Preva Mounting Plates 30 A2043 Metal Stud Support Plate 30 A2042 Gray 30 A2042 W gt White Metal Stud Support Plate Figure 102 Mounting Plates 106 MIDMARIX Maintenance Preva Operator Panel 30 A2076 Gray 30 A2076 W White Operator Control Panel Assy 30 P0029 Gray 30 P0068 White Wall Mount Cradle Figure 103 Operator Panel Cables Cat 5 50ft E1 13034 Cat 5 25ft E1 13003 Cat 5 6 inch E1 13004 Exposure Cord Pigtail 30 08035 107 MIDMARI lt Maintenance Preva Control Unit 30 4024 30 08078 Preval Switch Bracket 30 08151 Preva 2 0 Power Switch Assy 222 30 A2049 30 08041 Brake Assy 30 P0044 Gray rower PLE lt 30 P0057 White Progeny Insert 30 08072
33. 113 ASSEMBLY INSTRUCTIONS FOR DC MOBILEUNIT 113 REPLACING THE POWER CORD UTE 123 APPENDIX B i555 126 ELECTRONICS BLOCK DIAGRAM os eoe tu red oL ELS S 126 MIDMARI lt Installation Options Preva General Information Indications for Use The Preva Dental X ray is to be used as an extraoral source of X ray in Dental radiography Product Description Control Unit Tubehead Articulating Arm Horizontal Arm Modular Beam Limiting Device BLD Remote Control Model Configurations Installation and Service CAUTIONS The Preva Dental X ray System is a state of the art high frequency intra oral X ray machine The Preva consists of five components as shown in Figure 1 Component Diagram the Control Unit the Tubehead the Articulating Arm the Horizontal Arm the Cone and the Remote Control option The Control Unit provides for the input power connection and control of the Tubehead and Operator Panel It provides automatic line voltage compensation kVp control and exposure time control The Control Unit consists of the mounting base and Operator Panel The Tubehead contains the X ray tube high voltage circuit and Cone lt is shipped
34. 6 Separate the mobile unit base from the pallet CAUTION This should be done taking proper lifting precautions The base is heavy and requires two people to lift FIGURE 113 115 Appendix Preva 7 Locate the mobile unit post located in the top layer of parts removed in step 3 and insert into the mobile base as shown NOTE Take care not to pinch the Cat 5 cable or the tubehead connectors FIGURE 114 8 Inthe Kit Mobile Stand package Part 30 A2098 Locate and insert the bolt used to secure the post to the mobile base Requires 10mm Allen wrench FIGURE 115 FIGURE 116 9 Back out the Allen bolts used to secure the articulated arm to the post QTY 2 This allows the articulating arm to be inserted completely into post FIGURE 117 MIDMARIK Appendix Preva 10 Locate the Articulated Arm Tubehead assembly Remove the red transportation label Pull back the plastic packaging to expose shaft and remove paper tube protecting cables and connectors 11 Lift the arm tubehead carefully and guide the cables through the top of the post Carefully insert the articulated arm and take care not to pinch or damage the connectors FIGURE 118 12 Secure the articulated arm assembly to the post with the two Allen bolts that were backed out in step 9 FIGURE 119 117 Appendix Preva 13 Locate and install the articulating arm brake assembly Install
35. B Maarn The Netherlands www cepartner4u eu Only qualified and authorized personnel may operate this equipment observing all laws and regulations concerning radiation protection The operator at all times must remain at a safe distance from the focal spot and the X ray beam for operator protection Full use must be made of all radiation safety features on the equipment Full use must be made of all radiation protection devices accessories and procedures available to protect the patient and operator from X ray radiation WARNING To avoid the risk of electric shock this equipment must only be connected to supply mains with protective earth Only qualified and authorized service personnel should remove covers on the equipment All maintenance that requires removing of protective covers must be executed by service personnel when the patient is not present The sensor shall only be replaced when the operator and any part of the machine does not touch the patient Caution Operator is not to touch the USB connector on the Articulated Arm This equipment must only be used in rooms or areas that comply with all applicable laws and recommendations concerning electrical safety in rooms used for medical purposes e g IEC US National Electrical code or VDE standards concerning provisions of an additional protective earth ground terminal for power supply connection Before cleaning or disinfecting this equipment must always be disconnected fr
36. D HAND SWITCH OPTION 30 2040 00 0020000000000 51 INSTALLING THE REMOTE EXPOSURE STATION 30 2044 53 CONNECTING TO A GENERIC 2 WIRE REMOTE EXPOSURE SWITCH ccceccccececcecsccececcececcececcecsacecsacecsaeeceacecseeceaeecsceeceeeceueess 58 INSTALLING THE 12 INCH 30 CM Cone 30 A2200 pre esa 58 alm Ire SYSTEM CONFIGURATION 59 SYS PEN CONFIGURATION MODE us tons 59 PS TANG TA EE ies ES 60 CHANGING PRE PROGRAMMED EXPOSURE SETTINGS 61 SHOWING CURRENT SYSTEM CONFIGURATION 62 CHANGING THE CONE SIZE TENURE 63 5 64 65 iie xcu relong creme 66 ELECTRICAL PERFORMANCE ISSUE S dee docere eee torret ora cen eros dut ote sed tutae inea a 66 OBTAINING TECHNICAL SUPPORT eeu nuda oct Oa aee od cesta 86
37. D9 24VDC are illuminated and LED D10 is flashing Each illuminated LED verifies that appropriate supply voltages are present If the LEDs are not illuminated refer to the No Operator Display but Power Switch is On procedure in the Troubleshooting on page 69 of this manual Turn off the Preva Dental X ray System using the power switch as shown in Figure 29 Power Supply Control Board30 08160 i D11 350 Volts DC 08 12 Volts DC POPS PPT RPT eee eee D9 24 Volts DC Power Supply D10 Communications Board 30 08041 AO Installation Procedures Preva Mechanical Adjustments Horizontal Arm 1 Locate the brake assembly at the top of the Control Unit The brake Adjustment assembly has a screw on either side of a clamping bar over the Horizontal Arm pivot post 2 Using a4 mm Allen wrench as shown in Figure 32 tighten the screws equally to apply adequate braking to the pivot post so that Horizontal Arm begins to move after the Articulating Arm Figure 32 Tightening the Brake Additional The balance and friction of the Articulating Arm are preset at the factory During Adjustments the installation process check the balance and friction When moving the Tubehead the Articulating Arm should be steady in all positions and move before the Horizontal Arm If adjustments are necessary follow the adjustment procedures in the Troubleshooting section on page 66 of this manual Note The mechanica
38. Exposure Termination No Radiation Produced Display Shows Error Serial Communications Display Shows Pre termination Error Early Exposure Release Determined Not to be the Cause All X ray Indicators But No Voltage Measured at J1 on the Power Supply Board Very Short Exposures Regardless of Selected Exposure Time 3 4 5 Check if both audible indicators operate Check the Operator Panel first and check the Logic Board second If only the Operator Panel indicator works check if diode D2 on the Power Supply Board and D11 on the Logic Board illuminate during the exposure request If D2 and D11 do not illuminate this indicates that the X ray backup conductors in the CAT 5 communication cable are open Connect a substitute communication cable to test for this condition If the symptom persists contact Technical Support If the ribbon cable is open between the Logic and Power Supply Boards replace the cable This error can be caused by a high voltage breakdown in the head and is characterized by a snapping or popping noise within the Tubehead 1 2 oF 4 Inspect the condition of the feedback cable Inspect the condition of the communication cable used inspect the remote exposure switch wiring for a loose connection Refer to the High Voltage Breakdown information in the Troubleshooting section for detailed instructions Replace the Power Supply Board
39. Function Checklist and the calibration instructions which may be found in the Installation and Service Manual 50 MITDINVIATAIK Optional Installation Procedures Preva Optional Installation Procedures Installing the Coil cord Hand Switch Option 30 A2040 Jumper Configuration for Coil cord Hand Switch The Preva Dental X ray System can be installed with a coil cord handswitch 30 A2040 The coil cord handswitch is used to make exposures in addition to or replacing the use of the exposure button Installation of the coil cord hand switch involves connecting the hand switch into the connector on the bottom of the Operator Panel If the coil cord hand switch is used it may be required to disable the Exposure button on the control panel consult your local laws A jumper must be removed on the Operator Panel Board 30 08054 shown in Figure 38 to disable the operation of the hand switch 2 3 4 Turn the power off Remove the Operator Panel from its mounting on the Control Unit or wall plate Unplug the cable that connects the Operator Panel to the Control Unit With a Phillips screwdriver remove the 4 screws from the back of the Operator Panel Put the screws in a safe location for later use Remove the back cover from the Operator Panel Lift out the Operator Panel Board 30 08054 To disable the use of the Exposure button on the Operator Panel locate point J7 on the Operator Panel Board 30 08054 Then rem
40. ONS ON THIS MATTER TO MIDMARK TECHNICAL SUPPORT WARNING LAG SCREWS ARE NOT INTENDED TO BE USED AS AN ATTACHMENT METHOD FOR METAL SUPPORTS MIDMARK PROVIDES MACHINE SCREWS LARGE FLAT WASHERS AND NYLOCK NUTS TO USE WHEN FASTENING THE SYSTEM TO METAL SUPPORTS SINGLE STUD INSTALLATION WITH THE INSTALLATION GUIDE 30 P0076 Introduction The Installation Guide is intended to be a positive means of locating the center of a 2x4 wooden stud The Installation Guide is a necessary part of the installation and must be used whenever single stud installations are performed The Installation Guide is equipped with side tabs which can be removed if placement of the Guide 1 obstructed by an electrical box During installations which include attachment to a 4x4 wooden stud all of the tabs on one side of the guide can be removed in order to facilitate adequate placement and attachment 1 Locate the wooden stud 2 small opening in the wall to positively identify the position of the wooden stud m MIIDNIARIC Installation Procedures Preva 3 Draw an outline of the installation guide on the wall ensuring that the vertical height matches the requirements set forth on the Wall Mount Template 30 50003 Open the wall so that the installation guide will rest directly on the wooden stud 4 Place the installation guide on the wooden stud If the surface of the Installation Guide falls below the surface wall a
41. Options Preva 44 2 aie 112 27 oa 23 58 42cm XS MV P wel 1 59 149 9cm 56 4 143 26cm 57 1 145 03 35 9 91 18cm Figure 7 AJ U Mobile Unit 74 9 Extended 182 63cm MIDMARIX Installation Options Preva Environmental Factors Use The Preva Dental X ray System is intended for indoor use for normal dental applications at temperatures in the range 50 F 95 F 10 35 and maximum altitude of 12 000 ft 3657 Humidity should not cause condensation to form on the unit Storage Storage temperature should not exceed the range 31 150 35 C 66 C Support Requirements The Preva Dental X ray System is designed to mount on a single wood 2x4 inch drywall stud or equivalent wall support It can also be mounted on concrete or other similar wall construction Mounting to a plywood or particle board wall is not acceptable Verifying the wall support capability and the selection of the proper mounting hardware is the responsibility of the installer Please note that a two stud wall plate assembly 30 2042 is available to mount on two wooden studs A metal stud mounting kit 30 2043 15 also available The wall support and mounting hardware for the Preva must withstand a 100 Ib 45 4 kg shear load and a 500 lb 227 kg withdrawal force at each of the mounting bolts The wall fabrication and attachments to the building struc
42. P10 the Common Return and TP6 kV Program as shown in Figure 62 Compare measurements to the following chart volts DC 60 kV 65 kV 70 kV 4mA 3 1 3 4 3 5mA 3 2 3 5 3 75 6 3 3 3 8 3 8 7mA 3 4 3 NA 2 To evaluate the feedback voltages that represent the measured kV within the system compare the observed values in the table below To properly observe these values select 1 5 seconds of exposure time and measure the DC voltages during the exposure only This measurement is made across TP8 or TP10 the common return and TP3 the kV Monitor as shown in Figure 62 60 kV 65 kV 70 kV 4mA 3 1 3 4 3 7 5 mA 3 2 3 5 3 75 6 mA 3 3 3 6 3 8 7 mA 3 3 3 65 NA Values that approximately match the above tables represent a correctly operating system Other values may indicate that boards need to be replaced Additional assistance can be obtained from Midmark Technical Support 84 AMI Im PAS ie Troubleshooting Preva J3 Cable Connector Use TP8 or TP10 for ee Return when measuring DC voltage TP3 kV ac TP2 mA Program ps 6 kV Program spree 105 55 E REMOTE 177 Figure 62 Logic Board 30 08160 MIDMARIK 85 Troubleshooting Preva Incorrect mA At times various measurements of an otherwise fully functional system indicate that milliamperage may be incorrect Milliamperage mA is controlled by the microprocessor and is not adjustable The Preva generates milliamperage by first establi
43. PRP CBE gt 5 12 Volts TPA 4412 Volie DG 9 oyo DC Common D11 350 Volts DC Figure 52 Power Supply Board 30 08041 74 Troubleshooting Preva Use TP8 or TP10 for Common Return when measuring DC voltages TP9 24V DC E meses TP6 kV Program 72 8 1V DC Figure 53 Logic Board 30 08160 J1 Primary Power 30 08041 J4 Filament Drive and Feedbacks on 30 08043 J7 White Connector J5 Black Connector Figure 54 Interconnect Cable Locations MIDMARIK 75 Troubleshooting Preva No mA Produced On the Logic Board measure voltages at TP1 8 1V and TP9 24V Use TP8 or TP10 as Common Return If any of these voltages are not present after power is applied next check voltages on the Power Supply Board On the Power Supply Board use TP2 as a common test point to check TP1 24 volts DC and TP3 8 1 volts DC Then use TP5 as the common return to check TP4 for the presence of 12 volts DC as shown in Figure 56 Should any of these voltages not be present replace the Power Supply Board If these voltages are correct next check voltages on the Logic Board On the Logic Board measure between TP8 or TP10 the Common Return and TP2 mA Program This voltage should be between 1 and 2 volts DC If this voltage is not correct replace the Logic Board If this voltage is correct select 1 5 seconds of exposure time measure across pin 1
44. System Configuration menu Select ALTER DENSITIES from the Preset Options menu The first Image Receptor Type illuminates The display shows the selected Image Receptor Type and current density Using the Image Receptor Type button select the image receptor to adjust Use the up and down arrow buttons to specify a percentage by which densities will be increased or decreased for the selected receptor Densities can be increased in steps of 2596 and decreased in steps of 2096 Press the right arrow to save your settings Energize the system Press the Tooth Selection and Patient Size Selection buttons for five full seconds Select CHANGE PRESETS from the Menu Options screen Select SELECT RECEPTOR from the Preset Options menu Press the up or down button to highlight the sensor or phosphor plate to change and press Enter Select YES or NO on the Verification screen Exit the Preset Options menu oelect EDIT PRESETS from the Preset Options menu The display notifies you that you are entering Edit Preset Mode and Tooth Size Image Receptor Type and Patient Size are illuminated Use the Tooth Selection Image Receptor Type and Patient Size Selection buttons to select the preset to change The display shows the current values for the preset Use the right arrow button to display the technique factor to change Use the up and down arrow buttons to set the value for the selected technique factor and preset Repeat steps 2 4 to change ad
45. TP4 of the Operator Panel Board as shown in Figure 51 Absence of this voltage indicates the need to reconfirm the power supply voltages and communication cable Presence of the voltage requires the replacement of the Operator Panel Board 67 AMI Im PAS ie Troubleshooting Preva 2 8 1 and 24 Volts DC TP5 12 Volts DC Common 12 1 POWER 50 n V RC 1328 4 l g PE S a 3 7 N m5 a r as Te 12 3 i 73148 INC ail 4 4 a y 5 H i3 5 bU 4 1 TTA INC COMPANY SUPP iy 79i 5041 1 Figure 49 Power Supply maA Board 30 08041 MIDMARI lt 68 Troubleshooting Preva Use TP8 or TP10 for Common Return when measuring DC voltages 9 24V DC ee tr GiB 554 f 661 LE V TP1 8 1V DC Figure 50 Logic Board 30 08160 FEORO 08 THY 7241409 TP1 5 Volts DC eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee TP4 Common Return Figure 51 Operator Panel Board 30 08054 MIDMARIK 69 Troubleshooting Preva Light or Dark X ray Images At Power up the Operator Display Stops at
46. Tubehead fully upward Insert a 9 23 cm long 8 mm Allen wrench T handle into the adjustment nut as shown in Figure 97 Turning the wrench clockwise will cause the Control Unit side of the Articulating Arm to lift Turning it counterclockwise will cause it to drop Adjust as necessary until the Control Unit side of the Articulating Arm no longer drifts Replace the plastic covers on the end of the Articulating Arm Remove the plastic covers at the top of the Articulating Arm Position the Articulating Arm at a 45 degree angle Place a 9 23 cm long 8 mm Allen wrench T handle into the adjustment nut inside the Articulating Arm as shown in Figure 98 Turning the wrench clockwise will cause the Control Unit side of the Articulating Arm to lift Turning it counterclockwise will cause it to drop Adjust as necessary until the Control Unit side of the Articulating Arm no longer drifts Replace the plastic covers on top of the Articulating Arm 101 MIDMARI lt Maintenance Preva Articulating Arm Friction Adjustments Figure 99 Friction Adjustments The Preva has four friction adjustment points located at the four pivot points of the Articulating Arm These friction points can be adjusted to reduce or increase the force needed to position the Articulating Arm 1 Remove the plastic covers on the Articulating Arm to reveal the adjustment points 2 Using a 2 mm Allen wrench as shown in Figure 99 tighten both
47. When moving the Tubehead the Articulating Arm should be steady in all positions and move before the Horizontal Arm Note The mechanical adjustments should not be used to compensate for a system that is not properly leveled on the wall The movement of the Tubehead is set in the factory and cannot be adjusted Note If performing this adjustment as part of the initial installation of the Preva omit steps 1 3 1 2 Remove the screw from the Control Unit front cover Carefully remove the front cover Note If the Operator Panel is installed on the Control Unit carefully keep the Operator Panel together with the front cover Unplug the cable connectors and set the front cover aside Locate the brake assembly at the top of the Control Unit The brake assembly has a screw on either side of a clamping bar over the Horizontal Arm pivot post Using a 4 mm Allen wrench as shown in Figure 94 tighten the screws equally to apply adequate braking to the pivot post so that Horizontal Arm begins to move after the Articulating Arm Replace and re connect the front cover of the Control Unit Replace the screw on the front cover 98 Maintenance Preva Adjusting the Locate the friction assembly screws Using a 3 mm Allen wrench as shown in Horizontal Arm Figure 95 tighten or loosen screws as necessary to get proper movement without unwanted horizontal movement of the Articulating Arm Brake Assembly CAUTION Do no
48. ables between the Control Unit and the Tubehead assembly If no X ray occurs and no errors are displayed the problem may lie within the conductors of the white connector which is primary power to the Tubehead Assembly If no X ray occurs and the attempt is accompanied by a snap sound the problem may lie with the conductors of the black connector which is transmitting the feedback signals Connections for this cable begin with controls at J1 of the Power Supply Board and J3 of the Logic Board As shown in Figure 54 an internal set of connections will be accessed below the distal side of the horizontal arm and at the inside top of the Tubehead Yoke The final set of connections is accessed by removing the Pivot Cap located at the attachment point of the Tubehead to the Yoke If D11 on the Power Supply Board is illuminated power supplies are in order and the cable connections are correct place an AC voltmeter across the Tubehead connector J1 white connector on the black and white conductors request an exposure time of at least 1 5 seconds and measure the resulting voltage during the exposure Presence of 130 volts AC will require the replacement of the Tubehead Assembly Absence of 130 volts AC will require re inspection of the interconnect cables for open conductors 73 aMIIm PAS inde Troubleshooting Preva TP 24Volts DC ts Volts DC xm EX Common Return 8 1 Volts DC a BEBE
49. acecsnceceeecsasecsasessacecsuseceacenss 32 34 ELECTRICAL T 38 MECHANICAL ADJUSTMENTS oirassa ev edi pau Doce path dede ie e o a 41 INSTALLING THE CONTROL UNIT FRONT COVER AND THE OPERATOR PANEL serere sesso sese sese rei 42 INSTALEING PEASTIC COVERS 25 526 idi exa eoe E 46 PREVA OPERATOR PANEL eo uu oar SENE UMS S 47 USING THE OPERATOR PANEL 5 toes set secun viua OP poc iR Devon PP PORE ev 47 CHECKING 5 522 qu eoruin ta erat un 48 SYSTENPEUNCTION CHECKEIST lt quen Ud quuin 49 TUBE SEASONING PROCEDURE eost ie Oe uaa fout vele rand sedet feat c copo ved foc 50 OPTIONAL INSTALLATION PROCEDURES cccscccccnsccccansccccnnccccensccccsscccccsscccsssccccsnscccensccccessccccsscccccssccccnscccess 51 INSTALLING THE COIL COR
50. age at LINE and NEUT as shown in Figure 28 The reading should be Turning On the within the range of 100 250 2 Replace the power line terminal strip cover System 3 Turn on the Preva Dental X ray System using the power switch as shown in Figure 29 On the Operator Panel Figure 30 you will see the product display screen showing the software version Then the Operator Panel will display the default technique factors gt Figure 28 Verifying Input Voltage at the Line Input MIDMARIK 38 Installation Procedures Preva 3 2 On Off Switch L3 4 4 Figure 29 Turning on the Power Figure 30 Operator Panel 39 MIDMARI lt Installation Procedures Preva Circuit Board Verification Figure 31 Circuit Board Verification CAUTION The Power Supply Board 30 08041 when energized contains high electrical energy Avoid contact with this board After the system is turned off electrical energy will remain in the Power Supply Board for several minutes When attempting any service on this board first verify that voltage has dissipated On Power Supply Board 30 08041 shown in Figure 31 verify that LED D11 is illuminated The illuminated LED verifies that appropriate supply voltages are present Note Stored electrical energy is present whenever D11 is illuminated On the Power Supply Control Board 30 08160 shown in Figure 31 verify that LEDs D7 5VDC D8 12VDC and
51. and pin 2 of the Logic Board at the connector J3 During exposures this value should be 24 volts AC Also measure across pin 2 and pin 3 of J3 This value should be 24 volts AC If either voltage is missing replace the Logic Board If these voltages are present measure for the same values at the Tubehead Assembly at the connector J5 black on the blue and gray conductors and the blue and brown conductors If the voltages are not present inspect the inter connect cables between the control and Tubehead Assembly Connections for this cable begin with controls at J1 of the Power Supply Board and J3 of the Logic Board As shown in Figure 54 an internal set of connections will be accessed below the distal side of the horizontal arm and at the inside top of the Tubehead Yoke The final set of connections is accessed by removing the Pivot Cap located at the attachment point of the Tubehead to the Yoke If the voltages are present replace the Tubehead Assembly MIDMARI lt 76 Troubleshooting Preva Use TP8 or TP10 for Common Return when measuring DC voltages SSSR eRe EEE ES J3 Cable Connector Mnt 24VDC ew nm TP1 8 1V DC Figure 55 Logic Board 30 08160 Figure 56 Power Supply Board 30 08041 4 0 A f FOEI 105 451309 93 126 5 ZEIT TP2 8 1 and 24
52. ation menu Figure 44 select CONFIGURE UNIT You will see the Configuration menu shown in Figure 47 2 Select SET CONFIG You will see the Set Configuration menu shown in Figure 48 display a summary of maintenance data highlight select SHOW MAINT The following maintenance data are displayed e Total KJ kilojoules total system heat on the X ray tube e Exposure Count Reboots power up cycles e OT Counts over threshold counts 4 Press any button on the Operator Panel to return to the Configuration menu If you take an X ray while in diagnostic mode the display shows feedback values for that exposure Until you exit diagnostic mode the display will continue to show feedback values after each exposure 1 From the Main System Configuration menu Figure 44 select CONFIGURE UNIT You will see the Configuration menu shown in Figure 47 2 Select SET CONFIG You will see the Set Configuration menu shown in Figure 48 3 From the Set Configuration menu use the up and down arrows to highlight DIAG MODE ON Press the right arrow button to turn on diagnostic mode 4 Exit System Configuration mode by highlighting and selecting EXIT in the Configuration and Main menus 5 Make an exposure The display will show the following feedback values e kV e mA e Filament current 6 Press any button on the Operator Panel to clear the feedback values from the display 7 exit diagnostic mode press the Tooth Selection and Pat
53. ceccecececcececccceccececcececceceaeececeeceacececcecsaceceeecenceceasecsaeecsaeecsacecsuseceacenss 12 OBTAINING TECHNICAL SUPPOR Tarranu 12 INSTALLATION OPTIONS PDT 13 MOUNTING CONFIGURATION a 13 OPERATOR PANELLOCA TIONS 18 5 19 PREPARING TO TAE P R A 19 INSTALLING THE CONTROL UNIT ON A SINGLE WOOD STUD 1 eme sess sesso 21 INSTALLING THE CONTROL UNIT ON A DUAL WOOD STUD WALL 1 1 10 1 1121 1 1 e esse ses sesso 26 INSTALLING THE CONTROL UNIT ON A METAL STUD WALL ccccceccccececccceccececcececcecsaceceaceceaceceaeeceaesceeeceeeceaceceaceceueeceacenss 28 INSTALLING THE HORIZONTAL ARM AND BRAKE ASSEMBLY ccccececcccecccceccccecscsccececcecsaceceacecsceeceeeceaeeceacessaeeceaceceaceceueeceasenss 30 INSTALLING THE ARTICULATING ARM AND TUBEHEAD ASSEMBLY ccecccceccccccececccceccececceceacecsacece
54. ck values at TP4 mA Monitor and TP3 kV Monitor as shown in Figure 62 Look for the following values P4 mA Monitor This voltage should be between 1 5 and 3 5 volts DC during exposure attempts The voltage should not oscillate between 1 5 and 3 5 instead the measurement should come to a specific value and stabilize Oscillating values or absent values will indicate the need to replace the Tubehead Assembly 4 TP3 kV Monitor This voltage should be between 3 and 4 volts DC during exposure attempts The voltage should not oscillate between 3 and 4 instead the measurement should come to a specific value and stabilize Oscillating values or absent values will indicate the need to replace the Tubehead Assembly If the feedback voltages are present and stable replace the Logic Board MIDMARI lt 82 Troubleshooting Preva TP5 350 Volts DC Return TP8 4350 Volts Figure 61 Power Supply Board 30 08041 83 MIDMARI lt Troubleshooting Preva Incorrect kV At times non invasive measurement of an otherwise fully functional system indicates that kilovoltages may be incorrect Kilovoltage kV is controlled by the microprocessor and is not adjustable The Preva generates kilovoltage by first establishing a reference voltage and then comparing the feedback voltage to the reference Follow these steps to establish proper operation of the kV controls 1 Logic Board place a voltmeter on TP8 or T
55. d how to calibrate the replacement tubehead CAUTION DO NOT REMOVE THE TUBEHEAD UNTIL THE ARTICULATING ARM ASSEMBLY HAS BEEN SECURED WITH THE PROVIDED CABLE TIE AND FOAM INSERT THE SPRING TENSION IS ADJUSTED TO ACCOUNT FOR THE WEIGHT OF THE TUBEHEAD THE ARTICUTING ARM WILL SPRING OPEN IF IT IS NOT SECURED AND CAN CAUSE SERIOUS INJURY Models Affected All Preva Dental X rays Required tools Spanner wrench 30 T0055 Needle nose pliers Metric Allen wrenches 2 Phillips head screw driver 1 Small Phillips head screw driver Fluorescent screen 22 11467 Instructions 1 The replacement head as received will have the yoke cable assembly pre attached NOTE Do not remove the yoke cable from the tubehead Figure 63 2 Remove the cone from the head being replaced The cone sits in the tubehead Grab the cone firmly pull and twist out in the same motion Figure 64 87 Maintenance Preva 3 Install the cone in the replacement tubehead 65 4 Remove the two Allen head screws from the yoke and remove the yoke cover 3mm screws 2x Figure 66 5 Unplug the black and white connector Figure 67 6 Remove the two Allen head screws that secure the two ground wires to the yoke Take note of the position of each ground wire 3mm screws 2x Figure 68 E 88 Maintenance Preva Figure 69 Figure 70 Figure 71 7 Remove the end cap from the
56. ditional presets When you have completed all changes press the Tooth Selection and Patient Size Selection buttons simultaneously for 5 seconds to record the change mn Ie 61 System Configuration Preva Recall Presets 1 return all presets to factory defaults select RECALL PRESETS Preset Options menu The menu will ask you to confirm your choice 2 Select YES using the up arrow button and return all presets to factory default settings Selecting YES will erase any custom presets that have been set up 3 Select NO using the down arrow button and retain current presets PRESET OPTIONS EDIT PRESETS gt SELECT RECEPTOR P RECALL PRESETS igure Preset Options P EXIT Menu Showing Current System Configuration The Preva Dental X ray System displays the current system configuration This display is informational only 1 From the Main System Configuration menu Figure 44 select CONFIGURE UNIT You will see the Configuration menu shown in Figure 47 2 Select SHOW CONFIG The display will show e Current software version size Diagnostic mode on or off 3 Press any button on the Operator Panel to return to the Configuration menu CONFIGURE UNIT lt CONFIG MAINT EXIT Figure 47 Configuration Menu 62 MIDMARI lt System Configuration Preva Changing the Cone Size Selecting SET CONFIG from the Configuration menu Figure 47 displays the Set C
57. e Changing the Pre programmed Exposure Settings e Change the Cone Size e Showing the Current System Configuration e Display Diagnostic Data Using system 1 enter system configuration mode press the Tooth Selection and Patient Configuration Size Selection buttons on the Operator Panel simultaneously for 5 seconds Mode The display shows the Main System Configuration menu as shown in Figure 44 and the Ready Indicator blinks 2 select menu items while in system configuration mode use the up and down arrows to highlight a menu option Then use the right arrow button as an Enter button to select the highlighted option When changing presets the right arrow button is also used to select the technique factor 3 After selecting a menu option use the up and down arrows to increase or decrease values MENU OPTIONS CHANGE PRESETS CONFIGURE UNIT Main System gt EXIT Configuration Menu Figure 44 59 MIDMARI lt System Configuration Preva Adjusting the Display The Preva Dental X ray System allows the operator to adjust the display image 1 From the Main System Configuration menu Figure 44 select ADJUST DISPLAY You will see the Display Options menu shown in Figure 45 2 Selecting EXIT returns the display to the Main System Configuration menu Adjusting 1 Select ADJUST CONTRAST from the menu You will see the Progeny logo Contrast 2 Use the up and down arrows to increase or decrease the cont
58. e Switch E1 19000 3 Inspect the condition of the communication cable between the Logic Board and the Operator Panel Midmark includes two communication cables with each Preva system Should the installed communication cable be suspect temporarily substitute the other cable as a test tool 4 power switch is on and there is no operator display and a faint buzzing sound is also detected check the ribbon cable installed between the Power Supply Board and the Logic Board If the cable is not properly seated reinsert it If itis damaged replace the cable 5 Onthe Logic Board measure voltages at TP1 8 1V and TP9 24V Use TP8 or TP10 as Common Return If any of these voltages are not present after power is applied next check voltages on the Power Supply Board 6 Onthe Power Supply Board use TP2 as a common test point and check TP1 24 volts DC and TP3 8 1 volts DC as shown in Figure 49 Then use TP5 as the common return to check TP4 for the presence of 12 volts DC Should any of these voltages not be present replace the Power Supply Board If each voltage is present inspect the condition of the ribbon cable between the Power Supply Board and the Logic Board If the cable is undamaged and seated properly replace the Logic Board 7 power supply voltages are present and the ribbon cable and communication cable are found acceptable open the Operator Panel case and measure for the presence of 5 volts DC across TP1 and
59. e and support plate The wall fabrication and attachments to the building structure must be capable of withstanding a load moment of 850 ft lbs 118 m kg If the wall on which the 15 to be installed does not meet this requirement it must be reinforced In mounting configurations using the dual stud wall plate there are several holes available for incoming line power This is to provide for various locations of existing power boxes when installing as a replacement unit Refer to the mounting template in Figure 8 for hole locations 16 MIDMARI lt Installation Options Preva Installing The 4x4 Mount kit 30 2099 shown in Figure 12 contains the items below the 4x4 Mount Power line bracket Power cord cover Left conduit mounting plate Right conduit mounting plate 3 Phillips screws 6 nuts Instruction 1 Using the three Phillips screws secure the power line bracket to the power line cord cover 2 Place the right and left conduit mounting plates on the control 3 Place the assembled power line bracket and cord cover on the two bottom most threaded studs Left Conduit Mounting Plate Right Conduit Mounting Plate Power Line Mounting Bracket Figure 12 4x4 Mount 3 Screws Power Cord Cover Cabinet 6 Nuts O Layout 17 MIDMARI lt Installation Options Preva Operator Panel Locations The Operator Panel for the Preva Dental X ray System can be installed on the Control
60. ection of the enclosure to the junction box using the two screws provided If the cable is routed on the surface of the wall make sure it sits in the notch on the bottom of the enclosure Confirm that no wires are being pinched between the junction box and the enclosure Hook the outer section of the enclosure and fasten the two pieces at the bottom with the 6 32 x 5 16 screw 55 MITDINVIATAIK Optional Installation Procedures Preva Installing the Dual Switch Figure 41 Parallel Switch Configuration Note This configuration uses two cables One connects the Preva to the first switch and the other connects the first switch to the second switch 2 3 Route one cable from the Preva to the first switch location either through conduit or on the surface of the wall Route the other cable from the first switch location to the second switch location either through conduit or on the surface of the wall Thread the first cable end with the handset connector through the opening in the wall mount cover from the inside and connect to the Operator Panel If the cable is routed on the surface of the wall it should enter the wall mount cover through the notch on the left of the power switch For a parallel connection connect the cable conductors of both cables to terminal block J1 on the PCB of switch enclosures 1 as shown in Figure 41 The 2 indicates that two green wires will join together in terminal 1 of J1 etc
61. ed and No Audible Exposure Indicators Figure 59 Logic Board 30 08160 Two different audible exposure indicators are employed within the Preva system One indicator is embedded in the Operator Panel and will initiate when any exposure switch is pressed The second audible indicator initiates when the Logic Board begins the exposure sequence During normal operation first the Operator Panel indicator will sound followed shortly thereafter by the Logic Board indicator is important to recognize the sequence for troubleshooting purposes 1 If the Operator Panel indicator does not sound inspect the condition of any remote exposure switches Substitution is the preferred method to test these switches although a jumper wire can be applied across the contacts of J3 shown in Figure 59 on the Logic Board momentarily to simulate an exposure switch closure If the Operator Display indicator sounds but the Logic Board indicator does not activate observe LED D2 on the Power Supply Board and listen for the relay LS1 to activate on this same board Figure 60 LED D2 should illuminate during the exposure request If not inspect the condition of the ribbon cable between the Power Supply and the Logic Boards If the ribbon cable is acceptable replace the Logic Board 290 45 ub RR AB e FREE 126 b4 a4 80 Troubleshooting Preva LS1 Exposure Enable Relay D2
62. el In the remote location the Operator Panel snaps to the Operator Panel mounting cradle which is first mounted on the wall 1 10 11 12 13 14 15 Place and level the mounting template 30 0003 shown in Figure 8 at eye level in the location where the Operator Panel is to be installed Tape the mounting template to the wall Using an awl or other sharp object punch through the mounting template to mark the location for the bolts for the Operator Panel mounting cradle Drill pilot holes at marked locations With a drywall knife cut an opening as shown on the mounting template Remove the mounting template from the wall Using the anchors and screws from the mounting hardware packet install the Operator Panel mounting cradle in the position marked Locate the 25 ft 7 6 m remote control cable Run the remote control cable in compliance with local codes from the intended location of the remote Operator Panel to the back of the Control Unit Note The cable can also be run to an electrical box or opening at the top left of the wall plate assembly A sufficient length of cable should be left available to bring the remote cable out to the bottom front of the Control Unit Plug the remote control cable into the bottom of the Power Supply Control Board 30 08160 Place the top of the front cover on the Control Unit and pop the bottom of the cover into place as shown in Figure 33 being careful of the power switch and
63. em is powered on the Operator Panel shown Settings in Figure 37 displays the selections that were in use when the system was last powered off Exposure The Operator Panel displays the exposure settings kV mA and seconds for the Settings currently selected tooth image receptor type and patient size Use the Tooth Selection Image Receptor Type and Patient Size buttons to select other exposure settings Adjusting Preset exposure settings can be adjusted prior to making an exposure Exposure Exposure time can be easily changed by simply using the up and down buttons To adjust Settings kV and mA use the right arrow to select the exposure setting to adjust Then use g the up and down arrow buttons to adjust the value To save new presets use the System Configuration mode described on page 62 in this manual Exposure Button The Exposure button is used to initiate an X ray exposure For a complete and Ready exposure the button must be pressed and held until the Radiation Indicator no Indicator longer illuminates and the audible signal is no longer heard Releasing the Exposure button immediately terminates the X ray exposure Figure 37 Preva Operator Panel 47 Checking System Functions Preva Checking System Functions The following checks must be performed to complete the installation of the Preva Dental X ray System and as part of the recommended maintenance as indicated in the User Manual Failure to perf
64. fore be positioned without difficulty with the dental chair located within a radius outward from the pivot point to the dimensions shown in the diagrams The Preva Horizontal Arm is available in four lengths Each length gives the system a different reach Catalog P7015 P with a 30 A2074 Horizontal Arm has a reach of 56 inches Catalog P7016 P with a 30 A2073 Horizontal Arm has a reach of 66 inches Catalog P7017 P with a 30 A2071 Horizontal Arm has a reach of 76 inches Catalog P7018 P with a 30 A2164 Horizontal Arm has a reach of 82 inches The diagrams show Catalog P7018 P with an 82 inch reach For Catalog P7017 P with a 76 inch reach reduce the dimensions by 8 inches For Catalog P7016 P with a 66 inch reach reduce the dimensions by 18 inches For Catalog P7015 P reduce the dimensions by 28 inches The 82 inch reach for Catalog P7018 P assumes the use of the 8 inch 20 cm Cone that is supplied with the system If the optional 12 inch 30 cm Cone 30 A2200 is used the reach is reduced by 4 inches E i i 42 55 58 Min reach with Compact 82 1 2 208 5cm Max reach with Extralong Horizontal Arm 11 1 28 194 4 12 Cone reduces reach 4 inches 10 16 4 II Installation Options Preva i i 33 875 86cm T 92 5 235 Min 14 Clearance 35 5cm Height i i 44 5 _ 103cm 36 625 40 75 93cm 110cm 12 8
65. front cover of the Control Unit 10 Snap the Operator Panel into place on the front cover of the Control Unit 11 Mount the bracket for the coil cord hand switch in a convenient location 12 Stow the coil cord hand switch Connecting the 1 Route the cable from the coil cord hand switch through the hole in the wall Coil cord Hand ee Switch Operator Place a loop of the coil cord into the notch Locate the Operator Panel in the top portion of the shipping carton Panel in Remote Connect the coil cord hand switch to the left plug socket as viewed from the Location back on the bottom of the Operator Panel Connect the control cable to the right plug socket Carefully dress the two cables back into the wall Snap the Operator Panel into place on the wall mounting plate Mount the bracket for the coil cord hand switch in a convenient location Stow the coil cord hand switch COON 52 Optional Installation Procedures Preva Installing the Remote Exposure Station 30 A2044 The Remote Exposure Station is an option for the Preva that allows the operator to make the exposure from a fixed location remote from the main unit As shown in Figure 39 a single switch can be used or two switches can be used in series or in parallel Two switches in series will require both switches to be pressed simultaneously to make an exposure If two switches are used in parallel only one needs to be pressed to make an e
66. her through the lower mounting hole of the Control Unit and loosely tighten Be sure that the power wire extends through the opening at the bottom of the Control Unit Place a level on the Control Unit bearing parallel to the wall Level the Control Unit Tighten the upper and lower screws After the Preva is installed slide covers on the wall plate and fasten with the provided 8 screws H1 64 S1 7050 01 27 MIDMARI lt Installation Procedures Preva Installing the Control Unit on a Metal Stud Wall Mark and Drill The mounting template 30 50003 15 a guide for locating where to drill the holes Wall Plate and used to mount the wall plate and support plate to the wall Carefully placing the Support Plate mounting template on the wall will help ensure correct installation of these plates and hence of the Control Unit Mounting Holes 1 Using a stud finder locate the center of the stud on which the Control Unit will be mounted 2 Place the mounting template for the dual stud mount on the wall with the lower mounting holes 40 inches 101 5 cm above the floor 3 Place a level parallel to the vertical lines on the mounting template and adjust the mounting template until it is plumb 4 Tape the mounting template to the wall 5 Using an awl or other sharp object punch through the mounting template to mark the location of the mounting holes 6 Drill inch pilot holes at marked locations 7 Drill 1 inch clearance holes 8 Remove
67. ient Size Selection buttons simultaneously for 5 seconds to display the Main System Configuration menu From the Main menu highlight and select CONFIGURE UNIT Then highlight and select SET CONFIG On the Set Configuration menu highlight and select DIAG MODE OFF Note Feedback values are approximate 64 AMI Im PAS ie Calibration Preva Calibration Calibrating kV Adjusting kV during Calibration Deactivating the Calibration session Devices with firmware revision of 5 0 and below will require calibration of the tube current Please contact Midmark at the number listed in the manual for calibration instructions Occasionally it may be necessary to calibrate kilovoltage kV Approximate mA and kV levels can be observed using the Diagnostic Mode feature of the Preva system If the kV needs calibration follow these steps 1 Energize the system Press and hold the Tooth Selector switch and the Patient Size Selector switch for five seconds 3 Select the SET CONFIG option You will see the Set Configuration menu Figure 48 4 Press the down arrow to highlight the DIAGNOSTIC MODE ON option and press Enter You will see the Configure Unit menu Figure 47 5 Press the down arrow to highlight the Exit option and press Enter This displays the Menu Option screen Figure 44 6 Press the down arrow to highlight the Exit option and press Enter This returns the display to operational mode 7 Press Enter to select the
68. ke sure it sits in the notch on the bottom of the enclosure Confirm that no wires are being pinched between the junction box and the enclosure Hook the outer section of the enclosure onto the inner section at the top Push the wires all the way into the enclosure and fasten the two pieces at the bottom with the 6 32 x 5 16 inch screw 57 MIITDINVIATAIK Optional Installation Procedures Preva Connecting to a Generic 2 Wire Remote Exposure Switch To use a generic 2 wire switch connect the wires to the terminal block J3 Remote Exposure Switch Connector on the Power Supply Control Board 30 08160 as shown in Figure 43 109 451309 Figure 43 Installing the Remote Exposure Switch Installing the 12 Inch 30 CM Cone 30 A2200 The Preva Dental X ray System is factory set for use with the standard supplied 8 inch 20 cm Cone 12 inch 30 cm Cone 30 A2200 is recommended when using parallel film positioning techniques Using the longer cone requires longer exposure times See the System Configuration section of this manual on page 59 or setting the system to use the longer cone 58 System Configuration Preva System Configuration System Configuration Mode About system The Preva Dental X ray System has a software driven system configuration Configuration mode When the Preva is in system configuration mode you can perform the Mode following procedures e Adjusting the Display
69. l adjustments should not be used to compensate for a system that is not properly leveled on the wall M Installation Procedures Preva Installing the Control Unit Front Cover and the Operator Panel The Operator Panel can be installed on the Control Unit or remote from the Control Unit Installation of the Operator Panel on the Control Unit may require the purchase and use of the coil cord hand switch option 30 A2040 Important Note In order to comply with the regulations and proper X ray practices the Operator Panel must be located where the operator can view both the patient and the technique factors prior to the exposure On the Control 1 Unit 2 3 4 5 6 Figure 33 Placing the Cover on the Control Unit Connect the short cable at point J1 on the Power Supply Control Board 30 08160 Feed the cable through the front cover of the Control Unit Place the top of the front cover on the Control Unit and pop the bottom of the cover into place as shown in Figure S3 being careful of the power switch and cover alignment Replace the screw on the front cover of the Control Unit Plug the cable into the bottom of the Operator Panel Snap the Operator Panel into place on the front cover of the Control Unit as shown in Figure 34 42 Installation Procedures Preva Figure 34 Snapping in the Operator Panel 43 MIDMARI lt Installation Procedures Preva Remote Operator Pan
70. lation and Service Manual Midmark Corporation 675 Heathrow Dr Lincolnshire Illinois 60069 USA Phone 800 MIDMARK Fax 847 415 9801 midmark com Midmark Corporation 2014 U S Patents D470237 D469182 D470589 and 6 837 468 Table of Contents Preva Table of Contents EI RE 2 TABLE CONTENTS 555 UE a VE KS MUR AES VM EE GENERALINFORMATIONL decia eu pue Ca QU E 1 INDICATIONS FOR SUSE 1 PRODUCT DESCRIPTION C 1 REACH AND COVERAGE bautacs e 4 ENVIRONMENTAL FACTORS be deside iet 9 SUPPORT REQUIREMENT 25 5 Mis tuat I DA EE 9 ELECTRICAL 9 COMPLIANCE WITHAPPLIGABLE STANDARDS 10 CERTIFIED COMPONENTS 10 AUTHORIZED REPRESENTATIVES 10 CLP 11 EXPLANATION OF SYMBOLS ON TECHNICAL LABELS c
71. nnect the ground green wire of the line to the connection identified as GND on the power strip 5 Leave the power line terminal strip cover off until the following electrical verification procedure is complete LETETTE Abeta Power Line Terminal Cover Fi 27 Connector Power Line Terminal Strip Cover Connecting During initial powerup and verification the Operator Panel is required Connect the the Operator Panel with the 25 ft 7 62 m interconnect cable Later you will connect the Operator Panel in its final position for use Operator 1 Identify the Operator Panel and the 25 ft 7 62 m interconnect cable Panel with 2 Plug the cable into the left socket at the base of the Operator Panel the 25 ft 3 Plug the other end of the cable into connector J1 on the Power Supply Control Cable Board 30 08160 as shown in Figure 27 37 lt Installation Procedures Preva Electrical Verification Calibration Calibration of the Preva Dental X ray System is preset at the factory and is not required during initial installation Service replacement of the Power Supply Control Board 30 08160 or the Tubehead may require calibration See the Calibration section of this manual Verifying Input 1 Before turning on the system verify the input voltage by measuring the Voltage and volt
72. od 30 days after the installation and every 6 months thereafter Lag screws are not intended to be used as an attachment method for metal supports such as those found in center island pass through cabinets Midmark provides machine screws large flat washers and nylock nuts to use when fastening the system to metal supports MIDMARIX lt Installation Options Preva Horizontal Arm Control Unit Remote Control Figure 1 Component Diagram Your Responsibilities As An Installer And Service Engineer Verification of machine performance after installation must be performed according to the guidelines identified in the System Function Checklist which may be found in the User Manual or the Installation and Service Manual on page 49 Verification of machine performance after maintenance or repair must be performed according to the guidelines identified in the System Function Checklist and the calibration instructions which may be found in the Installation and Service Manual on page 49 Installation Options Preva Reach and Coverage Horizontal Arm Lengths Optional 12 Inch 30 cm Cone Figure 2 Reach and Coverage Diagram The reach of the system is measured from the tip of the Cone with the arm fully extended and the Cone pointing back toward the pivot of the wall plate This measurement method accommodates the normal positioning of the Tubehead to the patient A patient can there
73. om the main electrical supply The Preva Dental X ray is ordinary type medical equipment without protection against ingress of liquids To protect against short circuit and corrosion no water or any other liquid should be allowed to leak inside the equipment This equipment must not be used in the presence of flammable or potentially explosive gases or vapors which could ignite causing personal injury and or damage to the equipment If such disinfectants are used the vapor must be allowed to disperse before using the equipment i MIDMARIX lt Installation Options Preva Explanation of Symbols on Technical Labels Type B Protection against electric shock IEC 60601 1 1 Consult written instructions in User s Manual WARNING X RAY THIS X RAY UNIT MAY BE DANGEROUS TO PATIENT AND OPERATOR UNLESS SAFE EXPOSURE FACTORS AND OPERATING INSTRUCTIONS ARE OBSERVED X RAY EMISSION Mains HOT WIRE Mains NEUTRAL WIRE Earth Ground lt BPP Obtaining Technical Support Contact Midmark Corporation 675 Heathrow Dr Lincolnshire IL 60069 Phone 800 MIDMARK Fax 847 415 9801 imagingtechsupport midmark com MIDMARIKX Installation Options Preva Installation Options Mounting Configurations Mounting This section gives instructions for installing the Preva Dental X ray System in three Template mounting configurations Use the mounting template shown in Figure 8 to guide single stud installations
74. onfiguration menu Figure 48 with options to change the cone size The Preva Dental X ray System is preset for use with the standard supplied 8 20 cm Cone The 12 30 cm Cone 30 2033 is available Using the longer Cone requires longer exposure times which the Preva automatically selects when you change the Cone size in the Set Configuration menu Using a 12 inch 1 From the Main System Configuration menu Figure 44 select CONFIGURE 30 Cone UNIT You will see the Configuration menu shown in Figure 47 2 Select SET CONFIG You will see the Set Configuration menu shown Figure 48 3 From the Set Configuration menu use the up and down arrows to highlight the 12 CONE SIZE 4 Press the right arrow button to select the 12 Cone The display warns you that selecting the 12 Cone will override custom presets with the default factory settings for the 12 Cone 5 Using the up arrow select YES to install presets for the 12 Cone SET CONFIG 12 CONE SIZE PDIAG MODE ON PDIAG MODE OFF Figure 48 Set Configuration b EXIT Menu 63 system Configuration Preva Diagnostic Mode About Diagnostic Mode Showing the Maintenance Summary Showing Feedback Values After an Exposure The Preva Dental X ray System has a diagnostic mode in which you can display summary of maintenance data or display feedback values after each exposure 1 From the Main System Configur
75. oratories Inc with respect to electrical shock fire Number and mechanical hazards only in accordance with UL 2601 1 and CAN CSA 181750 C22 2 601 1 M90 and to the following particular standards 60601 2 7 IEC60601 2 28 EMI EMC 60601 1 2 Certified Components System Component Reference Number Tubehead 30 A1027 Control Unit Preva Mobile 30 A0013 Control Unit Preva 30 A0010 Modular BLD 20 cm Lg 70 mm Cone Gray 30 A2195 Modular BLD 30 cm Lg 70 mm Cone Gray 30 A2200 Modular BLD 20 cm Lg 60 mm Cone White 30 A2196 Modular BLD 30 cm Lg 60 mm Cone White 30 A2201 Modular BLD 30 cm Lg 60 mm Cone Gray 30 A2229 Modular BLD 20 cm Lg 30x40 mm Cone White 30 A2198 Modular BLD 30 cm Lg 30x40 mm Cone White 30 A2203 Modular BLD 20 cm Lg 20x30 mm Cone White 30 A2199 Modular BLD 20 cm Lg 35x45 mm Cone Gray 30 A2221 Modular BLD 20 cm Lg 35x45 mm Cone White 30 A2222 Modular BLD 30 cm Lg 35x45 mm Cone Gray 30 A2223 Modular BLD 30 cm Lg 35x45 mm Cone White 30 A2224 Modular BLD Base Gray 30 A2205 Modular BLD Spacer Gray 30 A2206 Modular BLD Spacer White 30 A2208 Authorized Representatives North America Midmark Corporation 675 Heathrow Dr Lincolnshire Illinois 60069 U S A Phone 800 MIDMARK Fax 847 415 9801 10 MITDINVIATAIK Installation Options Preva Europe Safety Radiation Safety Electrical Safety Explosion Safety CE Partner 4U Esdoornlaan 13 3951D
76. orm these checks may result in an installation that does not comply with U S Radiation Performance Standards 21 CFR Subchapter J CAUTION If the Preva Dental X ray System does not perform the functions below advise the owner that the system is not to be used See the Troubleshooting section of this manual on page 66 or contact Midmark s Technical Support 48 MITDINVIATAIK Checking System Functions Preva System Function Checklist Wall Mounting Labels Tubehead Tubehead Rotation Suspension Power Switch Operator Panel Controls Exposure Button Exposure Indicators Premature Termination Coil cord Hand Switch Option User Information Ensure that the wall support is adequate and that the system is properly mounted to the wall Ensure that all certified components bear labels that include the model and serial number date of manufacture and a statement of certification as noted elsewhere in this manual Check for oil leaks or other evidence that could indicate internal damage Replace the Tubehead if necessary Ensure that the Tubehead maintains its position around the horizontal axis while remaining easy to rotate and position Also check the vertical pivot of the Tubehead for easy movement while remaining in position after moving Check that all movements are smooth and quiet Verify that the Tubehead is properly counterbalanced for vertical drift and that the Horizontal and Ar
77. ove the shunt on J7 Put the Operator Panel Board 30 08054 back in position Put the cover on the back of the Control Panel using the 4 screws J7 Exposure Switch Jumper Settings Jumper Position Switch Closure Required for Exposure 1 2 3 4 default Remote Switch or Panel Switch parallel 2 3 Remote Switch and Panel Switch series 3 4 Remote Switch panel switch disabled 51 MITDINVIATAIK Optional Installation Procedures Preva J7 Figure 38 Disabling the Use of the Exposure Button oS 1L Connecting the 1 Remove the screw holding the front cover of the Control Unit in place Place Coil cord Hand E n safe location for later use emove the tront cover Switch Operator Cut out the notch on the base of the Control Unit front cover Panel Located 4 Route both the Operator Panel cable and the coil cord hand switch through Control Unit the hole in the bottom of the Control Unit front cover 5 Place loop of the coil cord into the notch 6 Carefully reassemble the Control Unit front cover keeping the coil cord in the notch Secure the front cover with the screw that was removed in step 1 7 Locate the Operator Panel in the top portion of the shipping carton 8 Connect the coil cord hand switch to the left plug socket as viewed from the back on the bottom of the Operator Panel Connect the short white cable to the right plug socket 9 Carefully dress the two cables back into the
78. r 7 front side of the wall using a straight blade screw driver adjust the threaded standoffs until the plastic part is flush with the drywall 8 Tighten the set screws in the threaded standoffs to lock them in place mn Ie 28 Installation Procedures Preva Figure 17 Support Plate for Metal Stud Wall Mount Install the Wall Plate 30 2042 Remove Control Unit Front Cover Mount the Control Unit Select the 5 16 18 x 1 long hex bolts 1 00 23100 01 Put the hex bolts through the mounting holes on the wall plate and loosely tighten Be sure that the power wire extends through the opening in the wall plate Level the wall plate Tighten the hex bolts Open the shipping carton and locate the Control Unit in the first level of the carton Remove the socket flathead screw from the front cover of the Control Unit Carefully remove the front cover Place the front cover and the screw in a safe location for later reassembly Select the 5 16 18 x 7 8 long socket cap screws H1 15 S23088 01 and washers H1 NA S12000 01 Put the one screw and washer through the upper mounting hole of the Control Unit Place the Control Unit on the wall and loosely tighten the upper screw Put the other screw and washer through the lower mounting hole of the Control Unit and loosely tighten Be sure that the power wire extends through the opening at the bottom of the Control Unit Place a level on the
79. rast between the menu text and the display background 3 Press the right arrow to save your settings Reversing the 1 Select REVERSE IMAGE from the menu The text and display background Image colors will be swapped 2 Press the right arrow to save your settings DISPLAY OPTIONS REVERSE IMAGE gt EXIT Figure 45 Display Options Menu 60 system Configuration Preva Changing Pre programmed Exposure Settings Displaying the Change Presets Menu Changing Receptor Settings Globally Preprogramming to Digital Sensors Changing Presets Individually The Preva Dental X ray System allows the operator to increase or decrease image density for all presets for a receptor simultaneously or to change each of the technique factors for a preset individually You can also restore factory default settings For charts of the factory default settings refer to Factory Default Exposure Settings on page 18 in the Preva User manual w aras Note If the 12 30 cm cone is going to be used configure the Preva for use with the 12 cone before changing preprogrammed exposure settings Configuring the Preva for use with the 12 cone will reset exposure settings to the default settings used with the 12 cone From the Main System Configuration menu Figure 44 select CHANGE PRESETS You will see the Preset Options menu shown in Figure 46 Selecting EXIT returns the display to the Main
80. s 1 Attach the black connector from the Horizontal Arm to point J4 of the Power Supply to the Control Board 30 08160 as shown in Figure 25 Power Note The plug must be properly oriented Be sure that the tabs on the connector Supply are down 2 Attach the white connector from the Horizontal Arm to point J1 on the Power Supply Board Board 30 08041 as shown in Figure 25 Note The plug must be properly oriented Be sure that the tabs on the connector are down Figure 25 Connecting the Horizontal Arm Cables to the Circuit Boards Optional integrated sensor cable Tie wrap the USB cable to the tie block Optional provided as shown in Figure 26 35 Installation Procedures Preva Integrated Sensor Attach provided tie block here loop and tie the cable to the tie block Figure 26 Tying optional sensor cable out of harm s way 36 Installation Procedures Preva Connecting 1 Using a 3 mm Allen wrench remove the power line terminal strip cover at the base Line Power of the Power Supply Control Board to gain access to the power line terminal strip as shown in Figure 27 2 Attach a flanged spade and connect the hot black wire of the power line to the connection identified as LINE on the power strip 3 Attach a flanged spade and connect the neutral white wire of the line to the connection identified as NEUT on the power strip 4 Attach a flanged spade and co
81. screws evenly at each adjustment point until the movement of the Articulating Arm is as desired Do not loosen adjustment points so far as to allow the Articulating Arm to drift Adjustment MIDMARIK 102 Maintenance Preva Preprogrammed Exposure Times The tables below show the factory default exposure settings for each combination of Tooth Image Receptor Type and Patient Size on the Operator Panel These exposure settings can be modified using the System Configuration mode See the System Configuration section for details on page 59 8 inch Cone 20 cm Progeny Schick Dexis Kodak Sirona PSP D Speed E F Speed Adult Child Adult Child Adult Child Adult Child Adult Child Adult Child Adult Child Adult Child E or Pele te 60 60 65 65 60 60 65 65 60 60 60 60 60 60 60 60 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 0 125 0 064 0 080 0 050 0 125 0 064 0 080 0 050 0 080 0 064 0 160 0 080 0 320 0 160 0 160 0 080 Bicuspid Incisor Bitewing 0 200 0 100 12 inch Cone 30 cm Progeny Schick Dexis Kodak Sirona D Speed E F Speed Adult Child Adult Child Adult Child Adult Child Adult Child Adult Child Adult Child Adult Child 910 14 9 Incisor 60 60 65 65 60 60 65 65 60 60 60 60 60 60 60 60 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 0 250 0 125 0 160 0 100 0 250 0 125 0 160 0 100 0 160 0 125 0 320 0
82. shing a reference voltage and then comparing the feedback voltage to the reference Follow these steps to establish proper operation of the mA controls 1 Onthe Logic Board place a voltmeter on TP8 or TP10 the Common Return and TP2 mA Program as shown in Figure 62 Compare measurements to the following chart volts DC 60 kV 65 kV 70 kV 4 mA 3 1 3 4 3 7 5 mA 3 2 3 5 3 75 6 mA 3 3 3 8 3 8 7mA 3 4 3 7 2 evaluate feedback voltages which represent the measured mA within the system refer to the table below select 1 5 seconds of exposure time and measure the DC voltages during the exposure only This measurement is made across TP8 or TP10 the Common Return and TP4 the mA Monitor as shown in Figure 62 Volts DC 4mA 2 5mA 2 4 2 9 7 mA 3 4 Values which approximately match the above tables represent a correctly operating system Other values may indicate that boards need to be replaced Further assistance can be obtained from Midmark Technical Support Obtaining Technical Support Contact Midmark Corporation 675 Heathrow Dr Lincolnshire IL 60069 Phone 800 MIDMARK Fax 847 415 9801 86 AMI Im PAS ie Maintenance Preva Maintenance Preva Tubehead Removal Instructions Overview Tubeheads are shipped with the yoke cable assembly already premounted to the tubehead This guide provides instructions for the installation technician on how to remove the original head install the replacement tubehead an
83. shown in Figure 15 Install and tighten the wood screw to prevent the unit from shifting CAUTION Do not over tighten the lag screws Over tightening the lag screws will damage the wooden stud and reduce the holding force 24 MITDINVIATAIK Installation Procedures Preva Figure 14 Leveling the Control Unit For 12 Screw Figure 15 25 Installation Procedures Preva Installing the Control Unit on a Dual Wood Stud Wall Mark and Drill The mounting template 30 50003 is a guide for locating where to drill the holes Wall Plate used to mount the wall plate to the wall Carefully placing the mounting template Mounting Holes for two stud mount installations on the wall will help ensure correct installation of the mounting plate and hence the Control Unit 1 Using a stud finder locate the center of the studs on which the wall plate will be mounted 2 Place the mounting template for the two stud mount on the wall with the lower mounting holes 40 inches 101 5 cm above the floor 3 Place a level parallel to the vertical lines on the mounting template and adjust the mounting template until it is plumb 4 Tape the mounting template to the wall 5 Using an awl or other sharp object punch through the mounting template to mark the location of the mounting holes 6 Drill 5 32 pilot holes for common pine studs at the marked locations 7 Remove the mounting template from the wall and save
84. side of the tubehead m 4 89 MIDMARIK Maintenance Preva 10 Remove the larger retaining ring by pulling it out with a pair of needle nose pliers Figure 72 i Figure 73 12 Secure the scissor arm with the provided cable tie and foam separator before removing both spanner rings WARNIING DO NOT REMOVE THE TUBEHEAD UNTIL THIS STEP HAS BEEN COMPLETED THE SPRING TENSION IS ADJUSTED TO INCLUDE THE WEIGHT OF THE TUBEHEAD THE ARTICUTING ARM WILL SPRING OPEN IF IT IS NOT SECURED AND CAN CAUSE SERIOUS INJURY Figure 74 90 PA il Maintenance Preva 13 Assemble the spanner wrench by threading the two leverage arms into the base of the spanner wrench Figure 75 14 Align the three pins the spanner tool with the alignment holes in the brass spanner nut Alignment holes Figure 76 15 Break loose the spanner ring by turning the spanner wrench counter clockwise Figure 77 16 Repeat steps 14 amp 15 to remove the second spanner ring 91 MIDMARI lt Maintenance Preva 17 Carefully remove the tubehead from the yoke Figure 78 18 Remember to transfer the friction ring from the original tubehead to the new tubehead The friction ring will either be on the shaft of the original tubehead or in the yoke assembly Figure 79 19 Feed the connectors and ground wires of the pre assembled yoke cable assembly through the opening of the yoke collar Figure 80 92
85. t attempt to adjust any other screws in the Horizontal Arm Articulating Arm Brake amp Screws Figure 95 Adjusting the Articulating Arm Brake Assembly 99 Maintenance Preva Adjusting the Articulating Arm Figure 96 Adjusting the Articulating Arm Follow this procedure ONLY if the yoke assembly does not stop on its own and makes contact with the horizontal arm Refer to Figure 96 while following the procedures below 1 Loosen the two set screws highlighted in Figure 96 but do not remove them completely 2 Loosen the two straight slotted screws highlighted in Figure 96 the figure shows only one of the two screws the other is located on the opposite side of the arm but do not remove them completely 3 Move the articulating arm into the position where you want it to stop before it makes contact with the horizontal arm Tighten the two straight slotted screws Tighten the two set screws Straight Slotted Screws 100 MIDMMARI lt Maintenance Preva Outside 1 Articulating Arm Vertical Movement 3 4 5 Figure 97 Adjusting Vertical Movement of the Articulating Arm Control Unit Side of Articulating Arm Balance Adjustment Figure 98 Adjusting Articulating Arm Balance Remove the plastic trim covers from the of the Articulating Arm nearest to the Tubehead Position the Articulating Arm with the arm nearest the
86. task Several factors must be considered for safe permanent installations Some of the key issues are MIDMARIX lt Installation Options Preva Lumber commonly used in construction projects can be different from location to location The grade age position and overall condition can vary greatly The attachment stud may have additional hidden loads The location of the pilot hole with respect to the center of the stud will affect the load bearing ability The size of the pilot hole required for the lag screw will be different based on the grade age and condition of the lumber Never over tighten the lag screw as this will weaken the mechanical connection Lumber with splits or cracks should not be used for attachment Plywood particle board or similar construction materials should not be used for attachment Consider lumber dryness or moisture when attaching to exterior framing studs Midmark mechanical designs will exert up to 920 ft Ibs 127 Kg of loading moment on the supporting structure Midmark provides fasteners for average installations Based on specific installation conditions it may be necessary to choose an alternate fastener or fastening methods the surface of the Installation Guide falls below the surface of the wall a correspondingly longer fastener must be chosen Seek the advice of a professional structural engineer to clarify any issues before the installation Inspect the attachment meth
87. te Note A 4x4 junction box will not be covered by the Control Unit Refer to the supplied mounting template for specific location WARNING UNDER NO CIRCUMSTANCES SHOULD THE 82 INCH 20 CM REACH SYSTEM BE ATTACHED TO A WALL IN THE SINGLE STUD CONFIGURATION PLEASE DIRECT ANY QUESTIONS ON THIS MATTER TO MIDMARK TECHNICAL SUPPORT 14 MILMARIC Installation Options Preva Dual Wood Stud Wall Figure 10 Dual Wood Stud Mount When installing the Preva Dental X ray System on two 16 inch 40 cm centered wood studs the Control Unit is mounted to a wall plate Two Stud Mounting Kit 30 A2042 which mounts to the wood studs as shown in Figure 10 Fasteners are provided with the wall plate In mounting configurations using the dual stud wall plate there are several holes available for incoming line power This is to provide for various locations of existing power boxes when installing as a replacement unit Refer to the reverse side of the mounting template Figure 8 for hole locations 15 Installation Options Preva Metal Stud Wall Figure 11 Metal Stud Mount When installing the Preva Dental X ray System on a metal stud wall the Control Unit is mounted to a wall plate Two Stud Mounting Kit 30 A2042 and uses an additional support plate Metal Stud Support Plate Kit 30 A2043 purchased as an option positioned on the back end of the wall See Figure 11 Fasteners are provided with the wall plat
88. the mounting template from the wall and save for future use Reinforce Filler material is added to the wall to prevent the metal stud wall from being Stud Wall crushed during installation 1 Cutan access hole 6 inches by 10 inches 15 cm x 25 cm in size between the clearance holes 2 Insert two 4x4 wooden studs in the access hole Attach the studs to the rear drywall surface with drywall screws CAUTION The sheet metal stud wall must be secure to hold a load of 850 ft Ibs 118 kg m Assembling and In the metal wall stud installation the Control Unit is bolted to a wall plate Figure Mounting the 16 that has been installed to the support plate shown in Figure 17 The wall and Support Plate support plates are shipped in separate cartons from the Preva 1 Putthe small then the larger washers and nut on each of the four carriage 30 A2043 bolts 2 Insert the carriage bolts into the support plate holes 3 Screw the threaded standoffs onto the carriage bolts with the slotted ends away from the back plate 4 Place the plastic sleeve bearings in the slotted ends of the carriage bolts 5 Using a 5 32 Allen key insert a set screw into each threaded standoff Screw the set screw until just below the slot in the threaded standoff but do not tighten 6 Using two sheet metal screws mount and level the support plate through the pilot holes on the back side of the wall Tighten the sheet metal screws with the screw drive
89. ticulating Arms do not drift horizontally Verify that the switch is working properly and that the Ready Indicator is illuminated when the power switch is in the ON position With the power switch located at the upper right of the Control Unit in the ON position verify that technique factors appear on the Operator Panel Also check the function of the selection buttons for Tooth Selection Image Receptor Type and Patient Size Pressing a selection button should cause indicator lamps to indicate the selected item Verify that the Exposure button on the Operator Panel is functioning properly To make an exposure press and hold the Exposure button until the Radiation Indicator is extinguished and the audible signal is no longer heard Make several exposures and verify that the Radiation Indicator illuminates and the audible signal is heard oelect the longest exposure time possible using the up and down arrows Initiate an exposure but release the Exposure button after a brief period of time before the timer terminates the exposure Verify that the display indicates Pre termination Error and returns to normal operating mode If a coil cord hand switch is used inspect the switch housing and coil cord for damage or wear Replace if evidence of damage is present Make certain that the user of the system has received the User Manual MITDINVIATAIK Checking System Functions Preva Tube Seasoning Procedure Note Do
90. ture must be capable of withstanding a load moment of 920 ft lbs 127 Kg m Electrical Requirements Mains Power The Preva Dental X ray System requires a 3 wire single phase AC power mains Supply that contain line conductor neutral conductor and protective earth conductor It is recommended that the unit be installed with a dedicated electrical line connected to a breaker with a minimum 15 amp rating The wiring must provide for a permanently grounded power line configuration Line Cord Use The installer must determine the suitability of installing the Preva with a line cord If a line cord is used the installer must ensure that the unit is properly grounded and has the required line rating Line Voltage AC 100 V to 250 V 50 Hz or 60 Hz See complete specifications on page 110 Fuse Rating 9 A 250 V UL Recognized See complete specifications on page 110 Max Line For normal function of the Preva Dental X ray System the resistance of the Resistance power line should not exceed 0 4 O at nominal line voltage MIDMARIX lt Installation Options Preva Compliance with Applicable Standards Radiation The certified components of the Preva Dental X ray System comply with Protection Radiation Performance Standards 21 CFR Subchapter J at the time of manufacture The certified components of the Preva Dental X ray System comply with IEC 60601 1 3 Radiation protection X ray equipment UL 2601 1 File Classified by Underwriters Lab
91. ve the green LED D11 of the Power Supply Board Illumination represents the presence of stored energy As an added safety practice it is recommended to measure for the presence of DC voltage across TP8 and TP5 of the Power Supply Board MIIDIVMIARIK Troubleshooting Preva No Operator Display but Power Switch is ON Your Responsibilities As An Installer And Service Engineer Verification of machine performance after installation must be performed according to the guidelines identified in the System Function Checklist which can be found in the User Manual or the Installation and Service Manual on page 49 Verification of machine performance after maintenance or repair must be performed according to the guidelines identified in the System Function Checklist and the calibration instructions which can be found in the Installation and Service Manual on page 49 1 Power Supply Board 30 08041 check for the presence of 100 to 230 volts AC at J4 the Input Power Terminal Strip as shown in Figure 49 If power is absent check that the Preva is connected to line power 2 Onthe Power Supply Board 30 08041 measure incoming power at J3 the Line Switch Connector as shown in Figure 49 Positions 2 and 4 carry the line voltage before the Line Switch and positions 1 and 3 carry the line voltage after the Line Switch Voltage at the input side of the switch but not at the output requires replacement of the Lin
92. xposure Tools The following tools are required to install the switch e Phillips screwdriver Flat blade screwdriver e Telephone cable stripper for dual switch configuration only e Wire stripper for dual switch configuration only 53 MITDINVIATAIK Optional Installation Procedures Preva Remote Exposure Switch Single Switch Configuration Remote Remote Exposure Exposure Switch 1 Switch 2 Figure 39 Remote Switch Dual Switch Configuration Configurations 54 MIDMARIC Optional Installation Procedures Preva Installing the single Switch Figure 40 Single Switch Configuration 1 Route the cable for the Remote Exposure Switch from the Preva mounting location to the Remote Exposure Switch mounting location This can be done through conduit or on the wall surface For either method a 2 x 4 junction box should exist where the Remote Exposure Switch is to be mounted Thread the cable end with the handset connector through the opening in the wall mount cover from the inside and connect it to the Operator Panel If the cable is routed on the surface of the wall it should enter the wall mount cover through the notch on the left of the power switch Connect the cable conductors on the opposite end of the cable to terminal block J1 on the PCB in the switch enclosure as shown in Figure 40 Make sure the two gray wires from the pushbutton switch are connected to terminals 1 and 2 of J2 Screw the inner s

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