Technical Service Manual MaxVenturi Oxygen Delivery
Contents
1. lt i E y Pa Step 7 Carefully pull the wire out Step 8 Remove the replacement from the rubber strain relief through cable from its packaging and insert the back of the device the stripped end of the wires into the rubber strain relief in the back of the unit Pull on the cable till approximately one inch of the shielded cable protrudes into the main cavity of the unit Step 10 Clip off the excess length Step 12 Attach two clips using wire of the zip tie and pull on the cable the zip tie next to the cable crimpers to the red and black wires till the zip tie is against the rubber Clips may be pre attached by service grommet inside the main cavity department at Maxtec upon request REV F 15 REPLACEMENT Step 13 Insert the clips into the Step 14 Place the batteries back into connector removed in step 6 The the unit Reconnect the power cable red wire should be inserted into the connector and the sensor cable verify that the unit powers up and that hole with the arrow on the connector to the back of the PCB a reading shows up on the LCD connector See photo _ screen Step 15 Connect a sensor to the sensor cable Turn the unit on and Step 16 Align the MaxVenturi Analyzer Assembly to the edges of the main body and reattach it using the 4 screws removed in step 1 lt gt 4 7 VALVE CARTRIDGE REPLACEMENT PROCEDURE The following procedure should be performed when a un2. 2 Use amulti meter to measure the mV output of the sensor Contact one probe of the multi meter to the center post of the connector and the second probe to the outside edge of the connector The mV reading should be at 10 14 mV at standard pressure Sea level 3 To determine what the mV output of the user s sensor is at standard pressure use the following equation where P u is the barometric pressure at the location of the sensor in mbar V s is the output voltage of the sensor in mV and V c is the corrected output voltage in mV V c V s X 1013 mbar P u 4 V c should fall within the 10 14mV range If V c falls below that range then the sensor needs to be replaced Contact Maxtec Customer Service for a replacement sensor If the V c falls within the correct range reconnect the sensor and attempt to calibrate the unit again Be sure to follow the correct procedure as outlined in the user manual for the MaxVenturi If the problem persists contact customer service for a replacement MaxVenturi Analyzer Assembly and follow Section 4 1 to replace the assembly PROBLEM The display reads CAL Err hi and the user has tried to calibrate the sensor 3 times at 100 oxygen POSSIBLE CAUSE The Max250 Sensor is defective Replace the sensor with a new sensor Calibrate the unit at 100 oxygen following the user manuals instructions This is done by completely blocking off the inlet of the MaxVenturi and leaving the sensor in its port T
3. G maxtec 6526 South Cottonwood Street Salt Lake City Utah 84107 801 266 5300 Fax 801 270 5590 Toll Free USA 1 866 4maxtec sales maxtecinc com www maxtecinc com Technical Service Manual MaxVenturi Oxygen Delivery Device R211MOI1 CONTENTS DESCRIPTION PAGE SECTION 1 Oe MINEO Cl NC rte ToT 3 SECTION 2 2 Diagnostics 2 ETOC ele 4 A TON GaN SUNG OC CG Ge tare EE E RE RERE R ERE let eet teat ta 5 22 WD ACK QV OUNO T 5 22 2 QUI IMICIU IC COS Cacia eee ce ne cee ee ee eee 5 Pe OMNI 1 e ETT 5 224 TeS OO CC OU creed el ie ae cece ace ise E esa edhe ee 6 2 2 5 Oxygen flow diagnostic sise eT s scssr 6 SECTION 3 Oe NTT eL eeil e excrete es ie eet eek la ease ocesea tears E nee 8 SECTION 4 4 Replacement Procedures cccccccccsscccseeeceeeecseeecceecccueecseeecsueeeseueesueeesseeeseeeenseseseessnaes 12 4 1 Front cover circuit board replacement sees eee ee eee eee eee 12 4 2 Flow meter cleaning procedure sss see eee eee eee e eee 13 4 3 Cable replacement ProCedure serioena ennn EEEE 14 4 4 Valve cartridge replacement procedure sese see eee eee 16 4 5 Orifice leak detection procedure cccceccccseececeeececeeeeeceeeeeeeueessueeessueeessaeeessaeeeeas 17 4 6 Orifice replacement procedure sss sees eee eee 17 4 7 Battery replacement procedure sese eee eee 19 4 8 Conic replacement sn ele lt e lR sericis EREE EEEa A 20 SECTION 5 5 Spare and replacement Parts cccccccc
4. 2 IMPORTANT In order to determine the exact cause of the part of the MaxVenturl as seen in Section failure hold the MaxVenturi so that light is entering the inlet port of the venturi 4 4 steps 1 2 and peer down the orifice opening through the opening where the flow control valve was removed The opening of the orifice should be circular and devoid of debris If the opening is circular and free of debris proceed with the rest of this procedure If there is debris refer to the Troubleshooting section to see how to remove debris Then reattach the valves Step 3 Place the orifice punch out Step 5 Use an arbor press to push Step 6 Remove the orifice from the tool down the outlet of the out the orifice Apply increasing valve cartridge opening by tipping the Max Venturi amounts of force gradually until the unit Use tweezers if necessary part is removed Step 7a Insert the small o ring RP56P02 901 onto the outside of the new Step 8 Insert the orifice onto the orifice orifice positioning tool M1152 REV F 18 REPLACEMENT MaxVenturi Orifice a Step 9 Thread the positioning Step 10 Place the device on its end and Step 11 Remove the orifice insertion tool MT152 with the orifice press the orifice into place using an arbor tool by twisting the tool counter completely into the opening for press The orifice is seated when the clockwise the valve cartridge of the positioning tool knob is fully depressed as
5. Department at 1 866 4MAXTEC or 1 800 748 5355 Step 1 Using a 5 32 Allen hex Step 2 Using a ball end of a 5 32 Allen Step 3 Two o rings sit in wrench remove the lowest stainless hex wrench remove the top stainless grooves on the front of the unit steel set screw holding the flow meter to steel set screw holding the flow meter It is suggested that these O the main body of the device The wrench must be held at angle The rings be replaced during screw will not come out of the hole but maintenance Contact Maxtec the flow meter will come off the front Service Department for replacement o ri Step 4 Using a 6 mm Allen hex Step 5 Use a pair of tweezers or Step 6 Tilt the flow meter to wrench remove the metal plug from the needle nose pliers to remove the plastic remove the ball flow meter by twisting counter clockwise plug inside the flow meter REV F 13 REPLACEMENT Step 7 Remove foreign particles in the Step 8 Insert the ball back into the Step 9 Check to make sure the ball flow meter using a long cotton hole Reinsert the plastic plug rolls freely back and forth in the flow applicator If particles remain use of inside the flow meter Reattach the meter rubbing alcohol may be required metal plug of the flow meter Blow out any debris with an air hose if necessary Step 10 Place the flow meter on a flat Step 11 Carefully line up the body Step 12 Fasten
6. of disposables e Ensure that the room air inlet HEPA filter is not soiled or wet Replace the filter if needed e Make sure that the nasal canula or other tubing is not occluded PROBLEM Unit fails to energize POSSIBLE CAUSE S e The batteries are exhausted Replace batteries following the repair procedure found in Section 4 7 e The batteries are oriented incorrectly Reinstall the batteries in the correct orientation e The batteries are not contacting the terminals Check for loose connection e The analyzer screen is damaged See replacement procedure 4 1 PROBLEM The analyzer gives an E02 code when a sensor is connected to the cable POSSIBLE CAUSES e The sensor has expired Check that voltage from sensor is present Testing the sensor on another unit may indicate if the sensor is broken or if the analyzer is defective e The sensor cable is broken Disconnect and then reconnect the sensor If the error persists check for a short in the sensor cable The cable can be broken when excessive force is used to pull the sensor out of its port by pulling on the cord instead of the sensor To replace sensor cable see replacement procedure 4 3 PROBLEM The MaxVenturi unit does not pass the Flow Diagnostic Procedure at one or more flow levels AND the MaxVenturi unit does pass the Oxygen Flow Diagnostic Procedure at one or more flow levels POSSIBLE CAUSES Note possible causes are listed from most to least likely e Gas is escapes around th
7. of the disposable filter REV F 6 TROUBLESHOOTING 6 Slowly open the flow control valve Adjust the flow control valve until the MaxVenturi flow meter reaches 20 LPM Be sure to read the flow meter with your eyes vertically level to the ball T Turn on the TSI flow meter if it is not already on Connect the 22mm hose to the outlet of the MaxVenturi 8 Read the flow on the TSI flow meter Check Oxygen Flow Testing Chart seen below to verify that the flow reading falls within acceptable range 9 Adjust the flow control valve until the flow meter reaches 35 LPM and verify the TSI flow meter is reading within the acceptable range 10 Adjust the flow control valve to 50 LPM and verify the TSI flow meter is reading within the acceptable range 11 Failure occurs when any flow reading falls outside the acceptable range Proceed to Troubleshooting Section for further diagnosis MaxVenturi Oxygen Flow Testing Chart pe 20 LPM 2 35LPM 2 97 LPM 35 LPM 4 26 LPM 4 87 LPM 50 LPM 6 77 LPM 7 38 LPM 2 2 6 MaxVenturi Leak Test Procedure 1 Attach oxygen supply line to the oxygen inlet fitting on the back of the MaxVenturi being tested 2 Close all flow valves Plug the sensor port and the outlet port with plugs or caps A new device is shipped with red caps provided Insert a barbed adapter into the air inlet Place a tube on the barbed adapter Place the end of the tube into a container of water 3 Open all the valves supplying
8. sure to align the wide gap in the cap with the two protruding ribs inside the cap Step 7 Verify that the new valve cartridge opens and closes properly REV F 17 REPLACEMENT 4 5 ORIFICE LEAK DETECTION PROCEDURE This test should be performed to determine if there is a leak on the sides of the orifice into the venturi cavity A leak at the orifice will cause a higher percentage of oxygen to exit the device than the minimum specification Step 1 Connect a 100 medical Step 2 Insert a long slender tool Step 3 Open the on off valve on the grade oxygen supply to the oxygen down the length of the device and back of the venturi inlet of the MaxVenturi Inlet plug the opening of the orifice pressure should be approximately 50psi Step 4 Open the flow control valve Step 5 Apply a few drops of soapy Step 6 If the orifice leaks bubbles will partially water or Snoop around the sides of form around the orifice After the the orifice procedure is complete allow the soapy water to dry before using the unit If a leak is found in the unit proceed to repair procedure 4 6 4 6 ORIFICE REPLACEMENT PROCEDURE This test should be performed when a leak was detected using step 4 5 or when a close inspection of the orifice indicates that it is faulty or damaged This replacement procedure is for Revision J of the Manifold and later See earlier note under 4 0 section heading Step 1 Remove the flow control valve Step
9. MaxVenturi shown Step 12 Reinsert the valve cartridge and reinstall the black knob and cap as seen in section 4 4 E L v Test the function of the device according to section 2 2 5 and perform a leak test according to 2 2 6 REV F 19 REPLACEMENT 4 7 BATTERY REPLACEMENT PROCEDURE Step 1 Remove the MaxVenturi Analyzer Assembly from the front of the unit by removing the 4 mounting screws in the back i Step 4 Reinsert the battery holder on the Velcro strip REV F Step 2 Take out the battery holder Remove the dead batteries from the holder A screwdriver or other tool may be used to pry the batteries out Step 5 Connect a sensor to the sensor cable Turn the unit on and verify that the unit powers up and that a reading shows up on the LCD screen Verify that the battery symbol is no longer displayed Step 3 Insert new batteries Ensure that they are oriented correctly following the diagram on the battery holder Step 6 Align the MaxVenturi Analyzer Assembly to the edges of the main body and reattach it using the 4 screws removed in step 1 REPLACEMENT 4 8 CONIC REPLACEMENT PROCEDURE Step 1 Lightly strike the male or Step 2 Carefully verify that all glue Step 3 Apply a small amount of glue female conic with a plastic mallet is removed before proceeding Loctite 414 around the edge of the Strike on opposite sides of the part opening for the fitting until the glue breaks loose and t
10. corrected output voltage in mV V c V s X 1013 mbar P u 6 V c should fall within the 10 14mV range If V c falls below that range then the sensor needs to be replaced Contact Maxtec Customer Service for a replacement sensor REV E 11 REPLACEMENT 4 0 REPLACEMENT PROCEDURES The following section contains repair procedures that can be performed in the field with the appropriate replacement parts Any repair procedure not included in this section should be performed by the manufacturer Only repairs shown here should be performed in the field by an authorized repair technician All other repairs should be performed by the manufacturer VERY IMPORTANT NOTE Check to see if you have an old or new MaxVenturi manifold This will determine whether you also need revision D of this document for an old manifold Rev H If there is a 2 scribed on the back of the manifold below the pole clamp then you have a new manifold Rev J if no number is present then you have an old manifold Rev H If the unit being repaired is a Revision H the orifice repair procedure described in section 4 6 is not field repairable and should be returned to Maxtec Service Department for Repair or an authorized service facility To become an authorized service facility contact Maxtec Technical Service Department at 801 327 9836 4 4 FRONT COVER CIRCUIT BOARD REPLACEMENT For front cover circuit board replacement use Maxtec part R211P13 MaxVenturi Follo
11. csssccceesceceeececeeeeeseeeeeseeeeeseuseeseeeeeseeesseeeeesaees 20 21 REV F 2 INTRODUCTION 1 INTRODUCTION NOTICE Repair of this equipment must be performed by a qualified service technician experienced in repair of portable hand held medical equipment The MaxVenturi series of products has been designed for maximum reliability stable performance and low maintenance send Maxtec products material in need of factory repair to Maxtec Customer Service Department 6526 South Cottonwood Street salt Lake City Utah 84107 Include RMA number Maxtec Customer Service Line 1 800 748 5355 HOW TO USE THIS MANUAL This manual provides service technicians with information needed to maintain and service the MaxVenturi series of products The manual is divided into several sections The DIAGNOSTICS section describes self test and service diagnostics for checking system functions The TROUBLESHOOTING section provides a guide to assist service technicians in locating the source of problems The REPLACEMENT PROCEDURES section contains instruction for removal and replacement of assemblies that are considered field replaceable GENERAL TROUBLESHOOTING GUIDELINES Troubleshooting the MaxVenturi series of products should always begin by assessing the problem with the user who experienced the trouble This may eliminate unnecessary troubleshooting steps Once a general problem has been identified refer to the trouble shooting guidelines in Section 3
12. e orifice In older models insufficient glue was applied to orifice Newer models may have defective o ring Perform the Orifice Leak Detection Procedure in Section 4 5 If leak is present proceed to section 4 6 to replace the leaky orifice Section 4 6 applies only to new models e The diameter of the orifice is incorrect due to damage or manufacturing defect Check the diameter of the orifice using pin gauges The diameter of the MaxVenturi orifice should be 020 and not less 019 and not more than 021 Use a smaller pin gauge first and increase the size of the pin gauge until the pin just barely slides through the hole and the next largest pin gauge does not fit If the size of the hole is too small or too large follow the replacement procedure in section 4 6 Section 4 6 applies only to new models REV F 8 TROUBLESHOOTING e The flow meter has a leak around its seals This can be caused by a missing or pinched o ring Visually check to make sure the o ring has a seal around all its edges If the o rings appear to be correctly positioned connect an oxygen source to the unit and use snoop or soapy water around the perimeter of the flow meter to check for leaks e The inner diameter of the diffuser tube is incorrect due to damage or manufacturing defect Check the inner diameter of the tube with pin gauges The MaxVenturi smallest tube diameter should be 252 005 Start with smaller pin gauges that fit and proceed until the pin ju
13. e proper function E02 No signal from sensor Possible Errors No sensor attached No signal is being sent through the cable to the analyzer Corrective action Disconnect and reconnect the sensor Unit should perform an auto calibration and should read 20 9 Should the unit fail to calibrate properly see troubleshooting section of this manual E03 No valid calibration data available Possible Errors Calibration is occurring when oxygen levels are not at room air or 100 oxygen Unit is not in thermal equilibrium Corrective action Make sure the unit has reached thermal equilibrium Perform calibration as described in user manual E04 Battery below minimum operating voltage Possible Errors Battery power is low Corrective action Replace the batteries as described in replacement procedures section of this manual CAL Err St O2 Sensor reading is not stable Corrective action Wait for displayed oxygen reading to stabilize when calibrating the device at 100 oxygen Wait for unit to reach thermal equilibrium Note this can take up to one half hour if the device is stored in temperatures outside its operating temperature range CAL Err lo Sensor voltage too low REV F 4 TROUBLESHOOTING Corrective action Repeat calibration routine as described in user manual If unit repeats this error more than three times refer to troubleshooting section of this manual CAL Err hi Sensor voltage too high Corrective acti
14. ement pins 2 pin connector zip tie and 3g Kit tube of Loctite 414 Male Conic Contains Male conic and 3 gram tube Upgrade Kit of Loctite 414 E a On Off Valve Assembly R211P13 Analyzer MaxVenturi MaxVenturi Assembly RPO6P29 4 40 screws REV F 23 REPLACEMENT RPO6P30 10 32 Socket Head Cap Screws RPO6P31 10 32 Pan head screws R211P30 001 Flow Control Valve Replacemen t Kit R211P30 002 02 Valve Replacement Kit RP31P05 Cable Strain Relief RP34P01 MaxVenturi Flow meter TTT TFT TTT RP56P02 009 O rings for flow meter QTY 2 RP56P02 901 Orifice o ring QTY 1 RP57P48 Metal pin clips QTY 2 RP57P49 2 wire male connector R211P25 001 Female Contains Female conic and 3 gram Conic tube of Loctite 414 REV F 24 REPLACEMENT RP56P02 901 Valve Cartridge O rings smaller RP56P02 903 Valve Cartridge O ring larger REV F 25
15. filter Maxtec Part RP34P02 2 2 3 Configuration 2 2 3 1 TSI Configuration Using the supplied software and PC modify the settings of the TSI4000 series flow meter to measure a mixture of oxygen and air with an oxygen concentration of 32 Ensure that this device is maintained at this setting for the duration of use 2 2 3 2 Test Bench Configuration On the outlet port of the TSI 4000 series flow meter attach the Flow Inspection Tool MT130 for the MaxVenturi Attach the 22mm diameter corrugate tubing onto the inlet port of the TSI4000 Series flow meter REV F 5 TROUBLESHOOTING 2 2 4 Test Procedure 1 Insert the disposable HEPA filter RP34P01 onto the MaxVenturi to be tested Check that the disposable filter is not excessively dirty or moist Replace filter when it is visibly contaminated with dirt or moisture 2 Mount the MaxVenturi to a pole or other device Attach the oxygen supply line to the oxygen inlet fitting on the back of the MaxVenturi 3 Turn oxygen control valve completely off 4 Open on off valve on the back of the MaxVenturi Turn on main oxygen supply valve from the O2 tank 5 Slowly open the flow control valve Adjust the flow control valve until the MaxVenturi flow meter reaches 20 LPM Be sure to read the flow meter with your eyes vertically level to the ball 6 Turn on the TSI flow meter if it is not already on Connect the 22mm hose to the outlet of the MaxVenturi 7 Read the flow on the TSI flow
16. he part comes off Scrape off excess glue inside the main body where the part was glued in Step 4 Position a new fitting in the Step 5 Wipe off any excess glue opening of the hole and insert the and allow the glue to dry fitting into the hole Strike the part gently with a plastic mallet to ensure the part snaps into place 4 9 O RING MAINTENANCE PROCEDURE Step 1 Remove the black knob from Step 2 Use a open ended Step 3 Remove the two o rings from the flow valve cartridge wrench to remove the valve the valve cartridge cartridge af Step 4 Replace the two o rings with new o rings O rings can be purchased from Maxtec Replacement part numbers are RP56P02 901 smaller o ring and RP56P02 903 larger o ring Step 6 Repeat the preceding steps to replace the o rings of the O2 valve cartridge 2 Control Knob O a REV F 21 REPLACEMENT 5 0 SPARE AND REPLACEMENT PARTS For replacement parts contact the Maxtec Service Department at 1 866 4MAXTEC or 1 800 748 5355 eee eae k R125P03 002 Sensor MAX 250E R211P04 R211P05 001 MaxVenturi Orifice new style R211P06 MaxVenturi Diffuser R211P07 Female Conic k R211P09 002 Chamber filter Repas Porous REV F 22 REPLACEMENT R100P20 002 Pole Mount Clamp and Hand screw eanne SS and R100P38 Battery Clip Sub Assembly R211P30 003 Sensor cable Contains replacement cable crimp Replac
17. it has a broken or defective flow control knob cartridge or a broken 02 control knob cartridge Note Replacement valve cartridges will not appear or assemble the same as previous versions of the knob but will function the same e For replacement parts contact the Maxtec Service Department at 1 866 4MAXTEC or 1 800 748 5355 Step 1a If you have the old style Step ib If you have new style Step 2 Using a 2 open ended knob as seen below pull the knob knob as seen below first remove wrench loosen and remove the off the cap on the knob and then valve cartridge Be careful not to remove the knob by loosening the scratch the venture body REV F 16 REPLACEMENT retaining nut with a 7mm nut driver while holding the knob Pull knob _ _ to remove Step 4 Before installing cargres remove Step 5 Reinstall the black knob by the knob as noted in step1b Use wrench placing the knob over the valve to tighten till the fitting is just barely snug stem and tightening the retaining Do not Over tighten the nut O ring nut with a 7mm nut driver while damage caused by over tightening can holding the knob be detected during a leak test Step 3 O2 control and flow control cartridges are different Check to make sure the replacement cartridge matches the cartridge being replaced 02 Control Knob l ron IS Ea ae Step 6 Install the cap on the new knob Be
18. meter Check Venturi Testing Chart seen below to verify that the flow reading falls within acceptable range 8 Adjust the flow control valve until the flow meter reaches 35 LPM and verify the TSI flow meter is reading within the acceptable range 9 Adjust the flow control valve to 50 LPM and verify the TSI flow meter is reading with the acceptable range 10 Failure occurs when one or more flow readings fall outside the acceptable range Note When failure occurs perform the Oxygen Flow Diagnostic Procedure found in Section 2 2 5 and then proceed to the Troubleshooting section of this document Acceptable Range 20 LPM 15 8 LPM 21 0 LPM MaxVenturi Testing Chart 50 LPM 42 1 LPM 47 6 LPM 35 LPM 28 8 LPM 34 0 LPM 2 2 5 Oxygen Flow Diagnostic Procedure The Oxygen Flow diagnostic procedure should be performed anytime the Flow Diagnostic Procedure has a failure at one or more of the flow rates 1 Insert the disposable HEPA filter RP34P01 onto the MaxVenturi being tested Check that the disposable filter is not excessively dirty or moist Replace filter when it is visibly contaminated with dirt or moisture 2 Mount the MaxVenturi to a pole or other device Attach the oxygen supply line to the oxygen inlet fitting on the back of the MaxVenturi 3 Turn oxygen control valve completely off 4 Open on off valve on the back of the MaxVenturi Turn on main oxygen supply valve from the O2 tank 5 Plug the inlet
19. on Repeat calibration routine as described in user manual If unit repeats this error more than three times refer to troubleshooting section of this manual CAL Err Bat Battery voltage is too low to recalibrate Corrective Actions Replace batteries See replacement procedures section 4 7 Repeat calibration routine to insure proper function 2 2 FLOW DIAGNOSTIC PROCEDURE 2 2 1 Background The MaxVenturi series of products uses the venturi effect to entrain room air by using a stream of oxygen flowing perpendicular to the entrainment port The output of mixed oxygen and air can be affected by various factors the velocity of the oxygen exiting the orifice affected by pressure and orifice size the shape and position of the diffuser the length and diameter of tubing attached to the exit port of the device the type of user interface and the presence and type of inlet filter A test system was devised by Maxtec Inc to measure the flow characteristics of the MaxVenturi device and to detect product failures or defects Note The flow diagnostic procedure must be performed with this test system setup to ensure correct diagnostic data 2 2 2 Equipment Needed e 50 psi supply source of medical grade oxygen TSI 4000 series flow meter Model 4040 E see www tsi com PC used to fix settings of the TSI 4000 series flow meter 22mm dia corrugated tubing 22 length Flow Inspection Tool Maxtec Part MT130 MaxVenturi HEPA
20. oxygen to the MaxVenturi Watch for bubbles in the container of water The maximum number of allowable bubbles is 1 bubble per minute 4 If the unit leaks bubbles into the container of water loosen the oxygen valve then retighten and repeat leak test Also check flow valve for leaks in the same manner If any valve continues to leak remove the valve and replace the o ring RP56P02 901 on the tip of the valve stem if necessary 5 If the unit continues to leak return unit to Maxtec Service department 3 0 Troubleshooting This section contains information to assist the Service Technician in determining possible faults affecting the performance of the MaxVenturi device The MaxVenturi device is comprised of several subassemblies For sake of troubleshooting the MaxVenturi analyzer is the portion of the device that contains the printed circuit board the plastic cover the overlay and any other parts permanently attached to those components This subassembly is only replaceable and cannot be repaired Another subassembly of the MaxVenturi is the sensor This subassembly is not repairable in the field such that if failures occur with the sensor it will need to be replaced The following section is a list of problems that may occur and possible causes of that failure PROBLEM Flow does not reach 55 LPM even with the flow valve wide open POSSIBLE CAUSE S REV F 7 TROUBLESHOOTING e The inlet pressure of the oxygen supply may be too lo
21. st barely fits in the hole and the next larger pin gauge does not fit Also check the if the diffuser tube has moved or is loose e The air inlet filter is occluded dirty damaged or wet Visually inspect it for occlusion dirt damage or moisture Replace if necessary PROBLEM The MaxVenturi unit does not pass the Flow Diagnostic at one or more flow levels AND The MaxVenturi unit does not pass the Oxygen Flow Diagnostic Procedure at one or more flow levels POSSIBLE CAUSES Note possible causes are listed from most to least likely e A foreign object has partially or fully occluded the opening of the orifice It is important that any time the orifice is suspect that it be checked for foreign material This procedure is explained in the orifice repair section 4 6 Section 4 6 applies only to new models If a particle is found in the hole remove it by inserting a small pin gauge into the hole and then blowing out the cavity with air Be sure the particle is removed before reinstalling the flow control valve e The orifice has a manufacturing defect Replace the orifice as described in section 4 6 Section 4 6 applies only to new models e The flow meter has a manufacturing defect This can best be detected by replacing the flow meter with a flow meter that is known to be correct and passes the Flow Diagnostic Procedure Replacing the flow meter with a good one and performing the Flow Diagnostic Procedure again on the unit will either determine
22. the flow meter is defective or rule it out PROBLEM Air does not come out the outlet of the MaxVenturi when the on off valve is open the flow control valve is partially open and an oxygen source is connected POSSIBLE CAUSES e The oxygen source is not on Check the valve on the cylinder or any other supply valves e The oxygen source is depleted Check the pressure of the gas on the cylinder e The connections between the oxygen cylinder and the MaxVenturi have a leak Check for leak and tighten connections if necessary PROBLEM Gas flows from the MaxVenturi when the on off valve is open but the flow control valve is closed as well as the O2 control knob POSSIBLE CAUSES e Ano ring is missing from either of the two control valves Remove each of them and check that there are two O rings on each of them Sometimes the smaller o ring will come off of the valve and be lodged inside the opening Remove it from the opening with a pair of tweezers and reapply it When the valves are reinserted be sure to check that the o ring is seated properly on the groove e Ano ring is damaged on either of the two control valves Remove each of them and check for damage e Aneedle valve is broken Check that the control valves needles are not broken or that the end of the needle valve has come loose PROBLEM The ball in the flow meter is jumpy POSSIBLE CAUSE e A particle is on the ball in the flow meter or in the tube of the flow meter To clean the flo
23. the flow meter in surface with the openings face up of the device over the flow meter so place with the two stainless steel Place the two o rings around the two the grooves for the o ring line up screws removed in steps 1 and 2 It small openings in the flow meter with the o rings on the flow meter works best to start both screws before tightening both of them 4 6 Cable Replacement Procedure The following procedure should be followed when the cable to the sensor is defective Please read the procedure completely before beginning The cable replacement kit part number is R211P30 003 e For replacement parts contact the Maxtec Service Department at 1 866 4MAXTEC or 1 800 748 5355 Step 1 Remove the MaxVenturi Step 2 Disconnect the two wire Step 3 Remove the batteries Analyzer Assembly from the front of connections by pressing in the center of from the unit to allow for room to the unit by removing the 4 the connecter and pulling lightly on the work mounting screws in the back wires Battery holder may be different than what is shown REV F 14 REPLACEMENT Step 4 Push on the cable from the Step 5 Cut the wire between the zip tie Step 6 Remove the connector from back to break any glue that is and the rubber strain relief the end of the red and black wires by sticking to the cable and the rubber inserting a small pin into the holes Strain relief _ and depressing the lever of each pin
24. to determine the proper corrective action After a component has been replaced verify that the unit is operating properly by running the appropriate diagnostic procedure CAUTION The MaxVenturi contains electronic components that are susceptible to damage by electrostatic discharge When disassembling the device work at a static controlled workstation wear a static control wrist strap to discharge accumulated static charges from you and any tool you are using Handle the circuit board by the case Use antistatic containers for transporting circuit boards Note Some illustrations and pictures may be for representation only However the repair operations remain the same as set forth in this service manual REV F 3 TROUBLESHOOTING 2 DIAGNOSTICS 2 1 ERROR CODES The MaxVenturi series of products contains internal programming designed to indicate common errors that occur during the use and maintenance of the device The analyzer has a self test feature built into the software to detect faulty calibrations oxygen sensor failures and low battery voltage When errors occur in the function of the oxygen analyzer assembly portion of the device error codes are displayed to signify to the end user or service technician the type of error and corrective action s needed to restore proper function of the device Listed below are the types of error codes displayed the types of error they may signify and the corrective action s needed to restor
25. urn the Flow control valve on and wait for the gas to equilibrate Push the CAL button and hold it for 3 seconds or until the display reads CAL lf the unit calibrates then it is likely that the first sensor is defective Contact customer service for a replacement Max250 sensor lf the unit fails to calibrate it is likely that the MaxVenturi Analyzer Assembly is damaged or defective If the problem persists contact customer service for a replacement MaxVenturi Analyzer Assembly and follow Section 4 1 to replace the assembly If a replacement sensor is not readily available then the following procedure can be used to determine if the sensor is defective Disconnect the sensor from the cable of the MaxVenturi leave the sensor in the sensor port Connect a 100 oxygen supply to the oxygen inlet of the MaxVenturi Plug the air inlet port open the on off valve of the unit and turn up the flow control valve Use a multi meter to measure the mV output of the sensor Contact one probe of the multi meter to the center post of the connector and the second probe to the outside edge of the connector The mV reading should be at 10 14 mV at standard pressure See level Pele REV F 10 TROUBLESHOOTING 5 To determine what the mV output of the user s sensor is at standard pressure use the following equation where P u is the barometric pressure at the location of the sensor in mbar V s is the output voltage of the sensor in mV and V c is the
26. w Check the pressure of the gas entering the device Make sure the inlet pressure falls between 45 55 psi Consult user manual for flow ranges at pressures outside of this range e If the inlet pressure is within range remove the device from its fixture and tilt the unit back and forth to see if the ball float rolls without impedance If it sticks or hesitates see repair procedure 4 2 e If the inlet pressure is within range and the ball float rolls without impedance the venturi orifice may be plugged or defective To check orifice and or repair it see repair procedure 4 6 PROBLEM The oxygen level on the display does not reach 100 even with the oxygen control knob fully open POSSIBLE CAUSE S e The device needs to be calibrated If the unit is being used with oxygen concentrations close to 100 it is best to calibrate the device at 100 Refer to the calibration section of the user manual to follow the 100 oxygen calibration routine e If the oxygen level on the display does not reach 95 check that the correct needle valve is in the 02 Control Valve See repair section 4 4 PROBLEM The oxygen level displayed does not go as low as the level indicated in the specifications even with the oxygen control knob completely closed POSSIBLE CAUSE S e The device needs to be calibrated Refer to calibration section of the user manual e Ensure that the humidifier patient circuit and patient interface being used are on the approved list
27. w meter see Section 4 2 PROBLEM The ball in the flow meter suddenly drops and won t return to higher flow levels POSSIBLE CAUSE REV F 9 TROUBLESHOOTING e The orifice has become occluded with a foreign object See the procedure to check for debris in Section 4 6 PROBLEM One or both of the buttons on the MaxVenturi have to be pushed really hard to work POSSIBLE CAUSE e The foam sticker under the overlay is missing or has become dislodged To repair the button carefully remove the overlay by pulling up on a corner with a blade Remove the overlay and check for the foam stickers circular foam adhesive dots Reinstall or install the foam sticker if they are dislocated or missing Carefully reinstall the overlay A small gap is acceptable on either side Be sure that the overlay does not overlap the edge of the recessed portion of the plastic cover PROBLEM The battery symbol appears on the LCD screen POSSIBLE CAUSE e The batteries are low in power Replace the batteries see section 4 7 PROBLEM The display reads CAL Err lo and the user has tried to calibrate the sensor 3 times POSSIBLE CAUSE The Max250 Sensor is defective or dying Replace the sensor with a new sensor if available Calibrate the unit This will determine if it is the sensor or the circuit board analyzer If no sensor is available then do the following to determine if the sensor is bad 1 Disconnect the sensor from the cable of the MaxVenturi
28. w the steps provided below to replace the front cover assembly e For replacement parts contact the Maxtec Service Department at 1 866 4MAXTEC or 1 800 748 5355 Step 1 Remove the MaxVenturi Analyzer Step 2 Detach the two electrical Step 3 Remove the replacement of the MaxVenturi from the main body by connectors from the back of the MaxVenturi Analyzer assembly from its removing the four screws on the back printed circuit board PCB Push in packaging Ensure proper care is taken Use a 2 Phillips screwdriver a the center of each connector to open to prevent electrostatic discharge which screwdriver is provided with each unit ihe acho each conector will damage the printed circuit board Step 4 Attach the battery cable Step 5 Attach the sensor cable Step 6 Align the front cover in the larger connector to the appropriate smaller connector to the appropriate upright position on the front of the connector larger connector on the connector small connector on the unit and install the 4 screws through PCB of the replacement MaxVenturi PCB on the replacement MaxVenturi the back to secure the replacement Analyzer Analyzer MaxVenturi Analyzer Ensure that the wires do not get pinched between the front cover and the main body of the device REV F 12 REPLACEMENT Step 7 Check that unit powers up and reads correctly 4 5 Flow Meter Cleaning Procedure e For replacement parts contact the Maxtec Service
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