004-0752-00-Service Manual Elevance Chair
Contents
1. e SS Lift A E ift Arm Base Cylinder E f E Tilt Sensor H ie 4 DOE all See n AX IER E TzU al unn g or EPTT SE NE 2 6 ss SH S mmm Es i SSL Geck gt Hydraulic ego L e Valve Bank J Sg 4 as C E d is Hydraulic CL C gt Valve Bank VU 9 i Facility Power c 115 V VAC OL 9 or BR BL 230 V VAC en Power Inlet 115 V VAC or Back Cylinder 230 V VAC Models 153810 Serial Numbers all Color Abbreviation Chart Midmark Corporation 2010 SF 1941 Revised mo dd yr 1 6 Always verify model amp serial number JS Chair Calibration and the Override Function Chair Calibration is an automated software directed routine of chair movements that identifies and stores data expressing the full range of acceptable chair movements The Override function allows a user to move the chair anytime it is powered by bypassing software directed chair movements The system2. AN E EI L ed A al mm Be Hydraulic Valve Bank is CL CR E 75 251 75 251 251 25 Gi 1821 821 Gi 182 82 Hydraulic Valve Bank B uu J a A l Facility Power i 1 2 3 J3 115 V VAC RIOJA or BR BL 230 V VAC g Power Inlet 115 V VAC or Back Cylinder 230 V VAC Models 153810 Serial Numbers all Color Abbreviation Chart Midmark Corporation 2010 SF 1941 Revised mo dd yr 14 Always verify model amp serial number Position Programming The system Two tilt sensors accelerometers const
3. Facility Power 115 V VAC or 230 V VAC Power Inlet 115 V VAC or 230 V VAC Models 153810 Serial Numbers all Color Abbreviation Chart Midmark Corporation 2010 SF 1941 Revised mo dd yr 1 8 Always verify model amp serial number JS Rotational Brake and Lockout Feature An electric rotational brake holds the chair in place by inserting a stop pin into one of a series of holes spaced around the pivot hub A software controlled lockout feature completely locks out all chair movement when activated The system Stepping on either brake release pedal on the chair base frame closes a limit switch enabling the brake solenoid to activate drawing in the stop pin and allowing the chair to rotate freely When the brake pedal is released the solenoid releases the spring loaded stop pin allowing it to pop into the next hole it comes to in the pivot hub Pivot Hub Manual Release Brake Solenoid Models 153810 Serial Numbers all Lockout Feature A lockout feature is provided to disable all electronic controls on the chair to prevent unintentional use To activate the lockout feature press either of the brake release pedals five times in succession The chair beeps five times to
4. Control Comm LEDs Hydraulic Valve Bank JD Omg O s TN TY rik EZ BATA IN Pa 7 a 00000 Hydraulic Valve Bank e A J18 L a H V ez UJ Facility Power 115 V VAC or 230 V VAC Base Cylinder YL GN Power Inlet Control Communication 115 V VAC Comm Ports 12 V VDC or 230 V VAC Models 153810 Serial Numbers all Color Abbreviation Chart Midmark Corporation 2010 SF 1941 Revised mo dd yr 8 Always verify model amp serial number Base UP DOWN Function Is there Power to the Chair When voltage is present at J3 on the PC Board the Power l
5. Solenoid Valve Unit P m Pressurized By Pump SV1 SV3 i Baoe p Back Up mmm Return By Gravity e Solenoid C Solenoid Closed Closed Suction Created By Pump md No Flow ll PRV CH Pressure NU NM Energized Device 2 Relief TER Valve TV1 gt Closed CV1 CV2 poate Voie Check Valve na TV3 E Base Up Down eler aon Closed SV4 Back Down Pump m Solenoid Off Closed Throttle r yr 3 TAS Valve T l J T Base Down Base Damper Back Damper OC IC IF TV5 TV6 Throttle Valve Throttle Valve Base Function Back Function A B Vent E E E DA2821i Base Cylinder Retracting Back Cylinder Reservoir Color Abbreviation Chart Midmark Corporation 2010 SF 1941 Revised mo dd yr 33 BACK UP Hydraulic Function Solenoid Valve Unit P EISE E SV3 E St Back Up Solenoid Solenoid Closed l Open A PRV 5 Pressure fi Relief I i De CV1 b E es Throttl HR PA rz TV1 FIM vive Check Valve a je Back Up Back Up Down Open Running r SV2 SV4 1 Back Down l Base Down Solenoid Solenoid Closed Closed Base Damper y M A Throttle Valve Back Function jp cm 7 KN Base Cylinder LTL
6. Color Farbe Couleur Color Colore Color English Deutsch Francais Europe espa ol europeo italiano others Kess BK WH Black White Schwarz Wei Noir Blanc Negro Blanco Bianco Nero BL WH Blue White Blau Wei Bleu Blanc Azul Blanco Blu Bianco 3j PK TN B RAWH Brown White Braun Wei Marron Blanc Marr n Blanco CL BK Clear Black Durchsichtig Schwarz Incolore Noir Transparente Negro Trasparente Nero GN YL Green Yellow Gr n Gelb Vert Jaune Verde Amarillo Verde Giallo GN WH Green White Gr n Wei Vert Blanc Verde Blanco Verde Bianco OR WH Orange White Orange Wei Orange Blanc Naranja Blanco Orange White PRIWH RD WH VIWH YUWH YLIGN YUBK SSES Midmark Corporation 2010 SF 1941 Revised 6 7 11 37 Midmark Corporation 60 Vista Drive Versailles OH 45380 USA 1 800 526 3662 1 937 643 6275 MIDNMARI www midmark com Because we care
7. Programming Chair Positions To program a button to a specified chair position A Use the arrow buttons to move the chair to desired position B Press the Program Button You will hear a single beep to indicate you are in the program mode C Press the desired Position Button 1 2 3 or 4 to set the programmed position to that button You will hear three beeps to indicate the button is programmed Alternate Foot Control Programming Method With the chair in the desired position you can just press and hold a position button 2 seconds The chair will beep three times to indicate the button is programmed The Control device gives you 3 seconds to press program a Position button after you are in the Program mode After 3 seconds the control returns to the normal operating mode All the numbered O buttons are Position Buttons Program Button Note The chair can be stopped any time during a programmed positioning sequence by pressing any other button on the control device DA2070 Special Programming Features The number 4 Position Button is capable of being programmed to invoke any one of these three different functions A The Cuspidor Return Function B The Return to the Last Position Function C Function the same as any other Position button Which of these functions the 4 button invokes is dependant on a dipswitch setting on the PC Board and should only be changed by a
8. Color Abbreviation Chart Always verify model amp serial number Collision Protection System and the Home Function The system The chair has six safety bail limit switches wired in series mounted in these areas Lower Pivot Cover Upper Lift Arm Cover Lower Lift Arm Cover right and left sides Base Cylinder Cover Chair Back All of these switches are normally closed switches except for the Chair Back switch which is a normally open switch How functions are disabled 1 When a cover equipped with a normally closed switch makes contact with an object as the base is moving downward the switch opens 2 When the back makes contact with an object as the back is moving downward the switch actuator bracket moves away from the normally open switch closing it When any safety bail switch moves out of its normal position power is removed from the Base and Back Down Hydraulic Valve Bank solenoids After and obstruction is hit the base or back stops lowering and raises a little so the object can be removed Models 153810 Serial Numbers all Midmark Corporation 2010 SF 1941 Revised 6 6 11 How are functions resumed 1 Release the down control button 2 Remove the object obstructing downward movement 3 Press control buttons to resume operation The Home Function The home position is a software directed base height back up position convenient for installation procedures or patient
9. Connect harnesses correctly and verify that a jumper is on J6 if there is no cuspidor Connect harnesses correctly If no continuity let motor cool 10 minutes or more and recheck If overload remains open or no continuity registers then replace hydraulic motor pump Hydraulic pump operates intermittently Running the motor continuously for a 30 second period will cause the overload to open Fill oil reservoir to correct level Connect electrical leads properly Refer to PC Board wiring diagram Replace capacitor with a known good capacitor of same voltage and manufactured rating Correct low line voltage at source Replace pressure relief valve Replace Base hydraulic cylinder BACK drifts down from elevated position If excessive hydraulic fluid is returning to reservoir through the vent tube of back cylinder then cylinder is leaking past its piston seals Replace Back hydraulic cylinder Hydraulic Motor Pump continues to run after the chair reaches its Up or Down limit Potted back tilt sensor connection is loose on chair PC Board J13 Tighten connection at J13 Potted back tilt sensor is malfunctioning Replace potted back tilt sensor Midmark Corporation 2010 SF 1941 Revised 7 16 2013 JS Elevance Chair Troubleshooting Chart continued Condition Check Solution Chair does not operate correctly with 1 Line voltage supplied to chair is
10. 115V Motor Capacitor 45 Mfd 220V VAC 230V Motor Capacitor 14 Mfd 420V VAC D21 D23 E Thermal Overload 7 115 or 230 V K Busser Assistant s Unit Keypad option as os 25 Y Delivery Unit Keypad option ll D12 oka a Extra used for options D19 s O One of these options is required Information Connector Ex cm Auxilarty Output Line VAC si 0208 Sl l es Back Down Back Up TITO TUDO sam Cuspidor Power and Rinse TB1 Galcncids El at NE SE Cj Test Plugs for Factory Use Only J7 amp J14 Hydraulic Valve Assembly Les Y Keypad Communication Lines J9 12 JL 12 115 or 230 V VAC A Sie SZ a ES Kg Communication Terminal for TB4 mE non chair mounted Lights m T1 DN a ee PC Board Wiring Diagram WM T IA and Harnesses El
11. 1941 Revised mo dd yr Always verify model amp serial number Back UP DOWN Function This illustration shows the components involved it the Back Up Down function See following page for more detailed description of the function Power ON indicator If light is OFF see Power to the Chair Hydraulics Electrical WT Geet Back Cylinder O fun d ss Control E Comm LEDs D I Pen MOJO L I see bes CL Hydraulic Lt E Valve Bank Valve Bank J1 E
12. A DA2822i Reservoir Back Cylinder Extending Midmark Corporation 2010 SF 1941 Revised mo dd yr 34 mm Pressurized By Pump m Return By Gravity Suction Created By Pump No Flow me m Energized Device Color Abbreviation Chart JS BACK DOWN Hydraulic Function PRV Pressure Relief Valve Closed Un Base Down I Solenoid Valve Unit SV1 SV3 Base Up Back Up Solenoid Solenoid Closed Closed CV CV UA das Check Valve 5 SC Back Up Down uh Closed xe sv4 Solenoid Closed Back WW Down Solenoid J Open Throttle t TV2 a E I Valve eg Back Down Base Damper Back Damper JUUUMH TV5 TV6 Throttle Valve Throttle Valve Base Function Back Function A Vent m S Base Cylinder Midmark Corporation 2010 SF 1941 Revised mo dd yr Back Cylinder Retracting 35 Reservoir Pump Off DA2823i mmm Pressurized By Pump m Return By Gravity Suction Created By Pump No Flow Energized Device Color Abbreviation Chart Hydraulic Valve Assembly Information To Throttle Valve Reservoir Valve Valva Back Down Back Up Back Up Neve E Throttle Check Throttle Valve Back Dampening Valve To amp From Back Cylinder CV2 Pressure Relief Valve IE AE Base Adjustments CV1 To amp From TV1 Base TV2 ES Cylinder e SIDE Throttle Valve Base Dampening Va
13. Two tilt sensors accelerometers constantly monitor positions relative to the floor of the lift arm base and the back This data is transmitted to the PC board where the software uses it locate the ends of travel points calculate working values for these points and store these values in memory Chair Calibration Calibration is an automated routine of the full range of back and seat movements performed to collect calculate and store data that expresses this motion in the software s language and then test the results of the routine Link to Chair Calibration Procedure Manual Calibration Manual calibration is a modified version of the chair calibration routine allowing a user to manually set the travel limits of the seat and back for a customized application Link to Manual Chair Calibration Procedure E Note Dipswitch 4 must be moved to the ON position to perform calibration Dipswitch 4 must be moved to the OFF posi tion for normal operation of the chair Always cycle the power off on when changing the dipswitch position Models 153810 Serial Numbers all Override Function The wireless remote has an override function activated by pressing and holding the P button and any arrow button simultaneously The override function allows a user to raise or lower the seat or back any time the chair is powered The override function is directed by the user s button inputs which override software dire
14. a convenient height for installation or patient access Step 2 Remove upper arm lift cover A Push clips in with a slotted screwdriver to release clips B Lift upper arm lift cover up to free front clips from shaft The chair beeps until it reaches the home position Upper Lift Arm Cover Lower Lift Arm Cover Base Front Cover Step 4 Remove lower arm lift cover A Working one side at a time move cover to the side and back to free it from mounting pins Step 3 Remove base front cover A Grasp bottom of base front cover B Rotate up and out to remove Models 153810 Serial Numbers all O Midmark Corporation 2010 SF 1941 Revised 4 11 13 21 Always verify model amp serial number Pivot and Base Covers WARNING N Always disconnect chair from the power source before removing any covers Failure to do so may result in personal injury Step 1 Remove upper pivot cover Two screws mount the upper pivot cover on the chair pivot Switch Bracket Shoulder Lower Pivot Cover Upper Pivot Cover Step 2 Remove lower pivot cover Cover hangs from two shoulder bolts and hooks over two pins on the switch bracket SK SC Step 3 Remove base cover NS SANS E Push in with a screwdriver to release clip and lift base cover to remove Models 153810 Serial Numbers all O Midmark Corporation
15. back cylinder back into the oil tank lowering the back cylinder shaft and the back Back continues down until 1 Back down button is released 2 Back reaches lower extent 3 Collision Protection System activates 7 Note The PC Board constantly monitors safety limit switches and sensory devices on the chair The Collision Protection System activates when a chair cover equipped with a safety limit switch hits an object as it is moving down The chair stops and raises slightly to disengage contact The chair also beeps until the control button is released Normal operation can resume once the object is removed and the safety limit switch becomes inactive Midmark Corporation 2010 SF 1941 Revised 9 12 2012 11 Always verify model amp serial number Collision Protection System and the Home Function This illustration shows the safety bail limit switches involved in this system See following page for a more detailed description of how this system works How Safety Bail Limit Switches Work owitches can be used as Normally OPEN or Normally CLOSED devices The switch name describes the rest normal state The active state is opposite the normal state Normally CLOSED NC Switch Plunger UP Current flows thru switch and exits NC path Plunger DOWN Common NC Current flows into switch and exits NO path Normally OPEN NO Switch Chair Pivot Chair Cover Back A E
16. from going back to discharge side of CV2 Back hydraulic pump during Base Down or Back Down functions Base Throttle B For setting speed of Base Up TV1 Base Down TV2 or both TV5 functions TV3 TVA E TV6 For setting speed of Back Up TV3 Back Down TV4 or both TV6 functions SV1 SV2 Electrically operated valves that are normally closed until power is applied to i solenoid SV1 opens to raise chair from Base SV2 opens to lower chair to Base SV3 SV4 Electrically operated valves that are normally closed until power is j applied to solenoid SV3 opens to raise Back SV4 opens to lower Back JS Color Abbreviation Chart B Be Bm E wu Be EE SR Bom Braun Mann Mais Meme a Gear Durensiohtg rege reen reen en Gem erin vn we ve ON L ev joe om jos es eme AE oR omne orange omues Nem Jg JI EC R Pune Rum o Morado Pepma TTL L GUPR clear Purple Durchsichtig Purpur incolore Pourpre Transparente Morado Trasparente Porpora RD md Rt Rue RRs p owe wwe wea Bee Jg Baws v eow Geb vmme Amato Gab Pm Pink Ree Rws Rm Tan Ian Fawe Membndae Tene marrone scuro
17. in calibration mode SW2 Program Switch 4 ON TIP The wireless remote has an override feature press and hold the P button and any arrow This feature allows chair movements that override the software controlled movements This moves the chair whenever it is powered Move SW2 program switch 4 to OFF Cycle power plug then unplug power source from chair Chair may not be calibrated Refer to Chair Calibration procedure Check all connections and harnesses Repair or replace malfunctioning connector s or wire harnesses Refer to PC Board wiring diagram for part numbers of harnesses If LIN Coupler is used to connect Assistant s Unit keypad verify LIN connections Use LIN Coupler to verify LIN harness LIN coupler functionality Chair PC Board is malfunctioning NOTE Incoming line voltage is present at J3 connector on Chair PC Board LED is not ON next to the related relay when the function is operated Replace Chair PC Board Some functions work with control buttons but at least one function does not 4 Safety bail limit switch contacts open on one or both limit switches or on the cuspidor limit switch J6 These limit switches prevent the chair from going down LED D17 on Chair PCB is ON when limit switch contacts are CLOSED Limit switches are wired in series with each other Remove obstacle causing switch es to open or replace malfunctioning Switch Verify continuity on all harnesses Loo
18. same keypad selections Extents must To set an extent always be set in Move base or back to desired Two beeps this order extent then press and hold indicate Chair PC button 1 for two seconds to set extent is set pear Base Low the extent DA2551i I Back High OR to skip setting current extent 31 A Base High Press and hold button 4 for two Two beeps E Back Low seconas indicate S2 J extent remains E O at chair limit K M i Note You can abort the manual calibration procedure any time by pressing the TEST O button on S1 switch GA gt F As soon as the final Back High extent is set the calibration routine Dipswitch 4 J n begins Step back and allow the chair to complete the necessary number of up down cycles which takes a few minutes DA2319 pet NINE Ee Manual Calibration continued Note The chair emits a short beep every 2 seconds while calibrating When calibration is successful the chair emits three long confirmation beeps G Unplug ch a from power supp ly and move dipswitch 4 on S2 program switch out to OFF position If calibration failed the chair emits one long beep at the end of the routine H Install covers see B Repeat entire Manual Calibration I Plug chair back into to power supply J Activate keypad and remote buttons to test operation Midmark Corporation 2010 SF 1941 Revised 4 11 13 27 JS
19. test chair operation Step 2 Remove the Upper Lift Arm Cover and PC Board cover 2 screws Locate S1 and S2 switch components on the Chair PC board Unplug the Chair and move dipswitch 4 on S2 program switch out of Calibration Mode OFF position Push in with a screw driver to release clips and lift Upper Arm Lift Cover up to free front clips from shaft Lift Cover must be removed to access Equipment Alert Chair PC Board and cover p OR Control buttons do not work normally during a Calibration Mode i Pressing any button including the S1 Test pushbutton will stop the chair movement and end the Calibration Mode PA SS Gi Step 4 Plug chair into power supply and press the TEST button on switch S1 Release clips 2 P L N O PROG SW TEST Chair PC Board S2 X As soon as the TEST button is pressed Calibration begins Step back and allow the chair to complete all 3 up down cycles of the calibration routine DA2551i Note The chair emits a short beep every 2 seconds while calibrating When finished calibrating the chair emits 3 long confirmation beeps Step 3 Move the 4 dipswitch on the S2 program switch to the Calibration Mode position ON gt The Calibration Mode has failed if the chair emits 1 long beep at the end of the calibration mode vec ol DA2319 O Midmark Corporation 2010 SF 1941 R
20. 2010 SF 1941 Revised 4 11 13 22 Always verify model amp serial number Seat Shrouds and Frame Covers WARNING Seat Shroud o Always disconnect chair from the power source before removing RH Shoulder any covers Failure to do so may result in personal injury Screw Qa E Washer Top Frame Cover Frame Cover is LH Models 153810 Serial Numbers all O Midmark Corporation 2010 SF 1941 Revised mo dd yr 23 Always verify model amp serial number Checking Oil Level Step 1 Position chair A Rotate chair to the right for more room to work B Tap a lift arm cover three times to raise chair to the home position C Lower back until level with seat D Disconect chair from power supply 2 WARNING Always disconnect chair from the power source before removing any covers Failure to do so may result in personal injury Step 2 Remove upper lift arm cover A Push in with a slotted screwdriver to release Lift Arm Covers upper lift arm cover clips Lift cover off chair DA2818i O Midmark Corporation 2010 SF 1941 Revised 02 04 2011 24 Checking Oil Level continued a Step 3 Check oil level A Remove screw in cap bracket and rotate bracket to remove Equipment Alert B Pull up on oil cap to remove from reservoir y Factory fill volume 1 3 1 4 U S quarts C Oil should be level with the base of the oil cap opening 1 2 1 3 l
21. DOWN function does not work 4 Nothing happens when any BACK DOWN button is depressed all other functions work properly 2 3 4 5 6 9 BASE UP function does not work 1 2 Nothing happens when any BASE UP button 3 is depressed all other functions work properly 4 5 6 Midmark Corporation 2010 SF 1941 Revised 7 16 2013 Base UP solenoid valve is stuck in the CLOSED position or clogged preventing hydraulic fluid flow Throttle valve TV1 turned in too far or closed on hydraulic solenoid valve assembly Hydraulic back cylinder leaks while using chair On Chair PC Board LED D10 by K2 Relay should be ON Line voltage should be present at J1 terminals 3 and 4 to Back up solenoid Replace hydraulic solenoid valve assembly Adjust TV1 Throttle Valve Travel time from end point to end point should be 20 seconds 1 second with 180 Ibs 82 kg on chair Replace cylinder Replace Chair PC Board JS Elevance Chair Troubleshooting Chart continued Condition BASE DOWN function does not work Nothing happens when any BASE DOWN button is depressed all other functions work properly BASE and BACK DOWN functions do not work Nothing happens when any BASE or BACK DOWN buttons are depressed all other functions work properly BASE and BACK UP functions do not work Nothing happens when any BASE or BACK UP buttons are depressed all other functions work properly BASE drift
22. ED position or is clogged preventing hydraulic fluid to flow back into reservoir Potted back tilt sensor connection is loose or harness is broken Potted back tilt sensor is damaged open or shorted On Chair PCB LED D11 by K3 Relay should be ON Line voltage should be present at J1 terminals 3 and 4 to Back Up solenoid Broken wires or loose connections at BASE UP solenoid and at J1 on Chair PCB Replace hydraulic solenoid valve assembly Adjust TV3 throttle valve Travel time from end point to end point should be 15 seconds 1 second with 180 Ibs 82 kg on chair Replace cylinder Tighten connection or replace potted back tilt sensor Replace potted back tilt sensor Replace Chair PC Board Remove obstructions Connect harnesses correctly and verify that a jumper is on J6 if there is no cuspidor Connect harnesses correctly Adjust TV4 throttle valve Travel time from end point to end point should be 15 seconds 1 sec with 180 lbs 82 kg on chair Repair wires and connections Replace hydraulic solenoid valve assembly Tighten connection or replace potted back tilt sensor Replace potted back tilt sensor Replace Chair PC Board Repair or replace harnesses or connections Open coil on the Base UP solenoid valve Condition BACK UP function does not work 4 Nothing happens when any BACK UP button 2 is depressed all other functions work roperly properly 4 5 6 T 8 BACK
23. Elevance Dental Chair Service Manual Model Numbers 153810 FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY Language of origin English 004 0752 00 Revised 7 23 2013 Style B THEORY OF OPERATION amp TROUBLESHOOTING Troubleshooting Chatt EE 2 Power to the E 6 Base UP DOWN EFunchon nos 8 Back UP DOWN F nctllon oett 10 Collision Protection System and the Home Function crias 12 Position Programming 14 Chair Calibration and the Override Function 16 Rotational Brake and Lockout Feature 18 DIAGRAMS PC Board Wiring Diagram Harnesses amp Information 31 BASE UP Hydraulic Function esce simt nies 32 BASE DOWN Hydraulic Function 33 BACK UP Hydraulic Function 34 BACK DOWN Hydraulic Function 35 Hydraulic Valve Assembly Information 36 Color Abbreviation Chart 37 0 O O Theory of Operation ACCESS PROCEDURES DIODOS nea 20 Lift Arm and Base Front Covers 21 Pivot and Base Cover c e 22 Seat Shrouds and Frame Covers 23 v D CG O d O O c au MAINTENANCE AND CONTROL SETTINGS Checking Oil Level cccccccceceesssteseeeeeeeeeeeees 24 AA NNNM 26 Manual Calibration ee 27 Programming Chair Hosibons 28 synchronize the Wireless Re
24. S s i com con T Ko NC NO WH Lower Lower Upper Lift Lift Lift Cover Cover Cover d WH WH WH Plunger DOWN Current flows into switch and exits NO path Plunger UP Common Current flows thru switch and exits NC path Models 153810 Serial Numbers all Midmark Corporation 2010 SF 1941 Revised 6 6 11 A Current path Facility Power 115 V VAC or 230 V VAC 12 Base Cylinder Cover Power ON indicator If light is OFF see Power to the Chair Power ON aM Light d d Be O L Power Inlet 115 V VAC or 230 V VAC E gl
25. access Tap any lift arm or a pivot cover three times to activate the home function e Note The chair beeps as it moves and stops beeping when it reaches the home position Relevant voltage readings 115 V VAC at J3 Power inlet Read pins 1 amp 3 12 V VDC at J4 Limit Switch Connector LED indicators Look at LED D17 to read status of all safety bail switches LED ON all switches are in normal state LED OFF one or more switches is active 13 Note The PC Board constantly monitors safety limit switches and sensory devices on the chair The Collision Protection System activates when a chair cover equipped with a safety limit switch hits an object as it is moving down The chair stops and raises slightly to disengage contact The chair also beeps until the control button is released Normal operation can resume once the object is removed and the safety limit switch becomes inactive Always verify model amp serial number JS Position Programming This programming function allows a user to program and store up to four specified seat and back position configurations for a quick single button recall See following page for a more detailed description of how this system works Power ON indicator If light is OFF see Hydr aulics Electrical Power to the Chair Back Tilt Sensor Lift Arm Tilt Sensor Base Cylinder
26. antly monitor positions relative to the floor of the lift arm base and the back This data is transmitted to the PC board where the software stores it enabling a user specified position to be recalled using a single programmed position button Recalling a programmed position When a programmed position is recalled the PC board software activates all the required functions at the same time to return the base and back to the same coordinates the software has stored for that programmed button Relevant voltage readings 115 V VAC at J3 Power inlet Read pins 1 amp 3 115 V VAC at J15 Pump Motor Read pins 1 amp 2 115 V VAC at J1 Hydraulic Valve Bank Read pins 7 1 2 or 3 for Back UP Read pins 8 1 2 or 3 for Back DOWN Read pins 9 1 2 or 3 for Base UP Read pins 6 1 2 or 3 for Base DOWN Look at LEDs for the J9 12 Control Comm Communication Ports to verify power and activity LED ON device connection is seen by software LED BLINKING comm port is receiving a command from a user Models 153810 Serial Numbers all P To program a button to a specified position A Use the arrow buttons to move the chair to desired position B Press and hold any position button two seconds to set it for that position The chair beeps three times to indicate the button is programmed To recall a programmed position A Press the desired position button 1 2 3 or 4 The chair wi
27. coil on the back up solenoid valve Back Up solenoid valve is stuck in the closed position or clogged preventing hydraulic fluid flow Throttle valve TV3 turned in too far or closed on hydraulic solenoid valve assembly Hydraulic back cylinder leaks while using chair Potted back tilt sensor connection is loose or harness is broken Potted back tilt sensor is damaged open or shorted On Chair PCB LED D12 by K4 relay should be ON Line voltage should be present at J1 terminals 1 and 2 to back up solenoid Look for obstructions that are 1 contacting the covers or cuspidor if applicable 2 actuating limit switches and 3 removing power from hydraulic functions Verify connections on safety bail limit switches are secure and on correct terminals If a cuspidor is not installed a jumper must be in place on J6 on Chair PCB NOTE The normally closed safety bail limit switches open when the chair back or shrouds are deflected and the actuator bracket moves away from the switch Verify connections on cuspidor safety limit switch are secure and on correct terminals NOTE The normally open cuspidor safety limit switch is tripped closed with cuspidor in normal operating position The switch opens when cuspidor is deflected Throttle valve TV4 turned in too far or closed on hydraulic solenoid valve assembly Back down solenoid coil has an open winding is disconnected or has a broken lead Back down solenoid valve is stuck in CLOS
28. cted inputs Relevant voltage readings 115 V VAC at J3 Power inlet Read pins 1 amp 3 115 V VAC at J15 Pump Motor Read pins 1 amp 2 115 V VAC at J1 Hydraulic Valve Bank Read pins 7 1 2 or 3 for Back UP Read pins 8 1 2 or 3 for Back DOWN Read pins 9 1 2 or 3 for Base UP Read pins 6 1 2 or 3 for Base DOWN Look at LEDs for the J9 12 Control Comm Communication Ports to verify power and activity LED ON device connection is seen by software LED BLINKING comm port is receiving a command from a user Midmark Corporation 2010 SF 1941 Revised mo dd yr 17 Always verify model amp serial number Rotational Brake and Lockout Feature This illustration shows only the rotational brake components For more details on how it works see the next page Power ON indicator Rotational If light is OFF see Brake Limit Power to the Chair Switches Rotational aooaa O
29. eo es ef e Kar s co EH a ln i H Facility Power O poa F 115 V VAC CL 9 2 or BR BL 230 V VAC i be Power Inlet Control Communication 115 V VAC Comm Ports 12 V VDC or 230 V VAC Models 153810 Serial Numbers all Color Abbreviation Chart Midmark Corporation 2010 SF 1941 Revised mo dd yr 1 0 Always verify model amp serial number Back UP DOWN Function Is there Power to the Chair When voltage is present at J3 on the PC Board the Power light is ON Refer to Power to the Chair more information Power to Controls PC board supplies 12 V VDC to J9 thru J12 control pad communication ports Relevant voltage readings 115 V VAC at J3 Power inlet Read pins 1 amp 3 115 V VAC at J15 Pump Motor Read pins 1 amp 2 115 V VAC at J1 Hydraulic Valve Bank Read pins 7 1 2 or 3 for Back UP Read pins 8 1 2 or 3 for Back DOWN Look at LEDs for the J9 12 Control Comm Communication Ports to verify power and activity LED ON device connection is seen by software LED BLINKING comm port is receiving a command from a user Models 153810 Serial Numbers all Back Up When a Back Up button is pressed the control device senses the command and converts it to an electronic signal This signal is sent thru the air to the remote control base antenna if wireless remote button was pressed or by wire if wired control butt
30. evance Chair O 1 3 CH no OU J3 C Description Part j i A Safety Bail Harness 015 2239 00 D Brake Release Power Light Harness 015 2237 00 A Chair with no cuspidor has a 015 2323 00 jumper across this connector and 015 2321 00 across J6 cuspidor limit switch 015 2320 00 Color Abbreviation Chart Midmark Corporation 2010 SF 1941 Revised 9 10 12 31 JS BASE UP Hydraulic Function 3 DEST Midmark Corporation 2010 SF 1941 Solenoid Valve Unit PRV gt Pressure A Relief nl A 4 Valve Closed SE CV1 cx Check Valve TV3 Check Valve Pid Base Up Down Back Up Down p Open Closed Ml SV2 Base Down SV4 Solenoid Back Down Closed Solenoid te Closed TV2 Throttle Valve Base Down Base Damper DRAKA S TV5 EL Throttle Valve Base Function 1 SV1 Base Up Solenoid Open Back Damper TU TV6 Throttle Valve Back Function Back Up Solenoid Closed SV3 E Base Cylinder Extending Revised mo dd yr Back Cylinder 32 as 2 Reservoir Pressurized By Pump Return By Gravity Suction Created By Pump No Flow Energized Device Color Abbreviation Chart BASE DOWN Hydraulic Function
31. evised 4 11 13 26 IDration r age AI IO LL Calibration use to set your own high and low extents for base and back travel oe Manual Calibration is only required to modify one or more of the limit of travel extents the base and back are set to originally Power to the chair must be cycled after dipswitch 4 is returned to OFF position to complete the procedure Base and back movements are monitored by sensory devices that keep them within a controlled range of extents Manual Calibration is a modified calibration routine that allows you to set your own end of travel points stores these values and then tests the results of the routine Below is the Manual Chair Calibration procedure Push in with a screw driver to release clips and lift Upper Arm Lift Cover up to free front clips from shaft Lift B Remove uper lift arm cover and PC Board cover two screws Cover must be removed to access Locate S1 and S2 switches on the PC board Chair PC Board and cover p C Move dipswitch 4 on the S2 Prog SW to ON position D Plug chair into power supply press and hold the TEST button SS 3 S A SS O Manual Calibration A Unplug chair from power supply on S1 switch for five seconds Listen for a beep to indicate it is in Manual Calibration mode Beeps continue one every 5 seconds as long as you are in manual calibration E Extents can be manually set or skipped for each of these base and back travel points using the
32. ge is supplied to Brake Release Solenoid thru J16 Hydraulic Pump thru J15 Hydraulic Valve Solenoids thru J1 Auxiliary Output thru J2 Regulated voltages 12 V VDC is supplied to Safety Limit Switches thru J4 Optional Cuspidor Safety Switch thru J6 Brake Safety Switch and Power ON Light thru J8 Communication Ports for Control Devices and J Box connections J9 thru J12 Optional Cuspidor Power Connection thru J5 Optional Light Communication thru TB1 a Note The same regulated voltage distributed to multiple devices is commonly called a BUS 5 V VDC is supplied to Test Port thru J14 Micro controller 3 V VDC is supplied to Back Tilt sensor thru J13 Power ON Light When proper power is supplied to the PC Board the power ON light illuminates a Note The Power ON light operates on regulated voltage coming directly from the 12 V VDC BUS The micro controller has no connection to this light Midmark Corporation 2010 SF 1941 Revised mo dd yr Always verify model amp serial number Base UP DOWN Function This illustration shows the components involved in the Base Up Down function See following page for more detailed description of the function Hydraulics Electrical Power ON indicator If light is OFF see Power to the Chair
33. ight is ON Refer to Power to the Chair more information Electric Power to Controls PC board components supply line and regulated voltages to components involved in the functions Hydraulic Power to Controls The pressurized oil system provides fluid for all hydraulic operations Link to Checking Oil Level for more information Relevant voltage readings 115 V VAC at J3 Power inlet Read pins 1 amp 3 115 V VAC at J15 Pump Motor Read pins 1 amp 2 115 V VAC at J1 Hydraulic Valve Bank Read pins 9 1 2 or 3 for Base UP Read pins 6 1 2 or 3 for Base DOWN Look at LEDs for the J9 12 Control Comm Communication Ports to verify power and activity LED ON device connection is seen by software LED BLINKING comm port is receiving a command from a user Models 153810 Serial Numbers all Base Up When a Base Up button is pressed the control device senses the command and converts it to an electronic signal This signal is sent thru the air to the remote control base antenna if wireless remote button was pressed or by wire if wired control button was pressed to the chair PC board The PC board supplies 115 V VAC to turn the Pump on then 115 V VAC to the Base Up Solenoid to open the Base Up valve As the Pump Motor runs fluid is pumped thru the open Base Up valve filling the base cylinder extending the shaft and raising the base The PC board monitors sensory devices thr
34. indicate it is locked out Buttons on control devices and the brake release pedals will no longer work To release the lockout feature press either of the brake release pedals five times in succession The chair again beeps five times to indicate it is unlocked Buttons on control devices and the brake release pedals will function normally again Relevant voltage readings 115 V VAC at J3 Power inlet Read pins 1 amp 3 115 V VAC at J16 Rotational Brake Read pins 1 amp 2 12 V VDC at J8 for Power Light and Brake Limit Switches Midmark Corporation 2010 SF 1941 Revised mo dd yr 1 9 Always verify model amp serial number JS Upholstery SerenEscape Heat and Massage Connectors optional Headrest Lift up and pull towards foot end to remove seat Mounting Post Rotate Locking _ Knob Arm Screw Models 153810 Serial Numbers all Midmark Corporation 2010 SF 1941 Revised mo dd yr 20 Always verify model amp serial number Lift Arm and Base Front Covers Step 1 Raise chair and disconnect power supply A Raise chair approximately 26 to 28 from floor B Disconnect power supply from chair WARNING Always disconnect chair from the power source before removing any covers Failure to do so may result in personal injury 8 Equipment Alert Y Tap a lift arm or lower pivot cover three times to raise the chair to the pre programmed home position
35. ing attached to brake lever arm is missing or broken Replace spring Headrest difficult to adjust or does not stay Verify the friction cam adjustment Reset the friction cam mechanism in position SerenEscape Remote Control 1 Verify connection plugs on SerenEscape control box Secure connection s Heat light blinks Straighten bent pins Wrap connections with electrical tape in a figure 8 2 Verify red cable connection in upholstered back pattern 3 Look for upholstered back remote control or control box issues Replace upholstered back remote control or control box in this order Power light blinks 1 Verify connections at both ends of the SerenEscape power supply Secure connections 2 SerenEscape power supply voltage is incorrect Should be between 10 14 VDC If voltage is incorrect replace SerenEscape power supply One or both massage motors do not 1 Verify both black cable connections Secure black cable connections with electrical tape wrapped in a figure 8 operate pattern Midmark Corporation 2010 SF 1941 Revised 7 16 2013 5 Power to the Chair This illustration shows the components that affect a chair functions See following page for a more detailed description BS PM m d Power ON indicator BK illuminates when RD power is supplied Micro controller Power Inlet PC board regulators control 115 V VAC and direct
36. iters D Add only Hydraulic Oil with Viscosity ISOVG 32 if oil level is low Oil Level Step 4 Install oil cap cap bracket and lift arm cover A Push oil cap into tank opening B Place bracket over screw rotate bracket to fit over oil cap and screw into tank C Replace upper arm lift cover see Step 2 D Connect chair to power supply DA2815i Midmark Corporation 2010 SF 1941 Revised mo dd yr 25 Chair Calibration Procedure Se Note Calibration is only required if the chair is not operating at all or if it is not raising lowering to the proper extents Power to the chair must also be cycled after moving the 4 dipswitch to complete the procedure Calibration should always be performed after replacing a chair s PC Board a tilt sensor or any lift mechanism Movement of the chair is monitored by sensory devices that keep the chair within the range of motion accommodated by the drive mechanisms controlling the chair The Calibration Mode is a programmed routine of chair movements that locates the end of travel points calculates working values for these points stores these values in memory and then tests the results of the routine Follow these steps to calibrate a chair Step 1 Unplug the chair from the power supply Step 6 Install PC Board Cover and Upper Lift Arm Cover Plug chair back into to power supply Activate control buttons to
37. k for broken wires or loose connections Repair or replace loose connectors or broken harnesses Perform a continuity check on each switch on membrane touchpads and foot control Depressing a key on a touchpad closes the switch Refer to touchpad wiring diagrams If hydraulic UP functions do not work then verify the capacitor for the hydraulic motor pump by replacing it with a known good capacitor of the same rating If a switch does not show continuity when depressed to the closed position then replace the membrane touchpad or foot control Replace malfunctioning capacitor Chair PCB is malfunctioning NOTE Incoming line voltage is present at J3 connector on the Chair PCB LED is not ON next to the related relay on the Chair PCB when the function is being operated Check visually for damaged components or broken traces on PCB Replace malfunctioning Chair PC Board Back or base position sensor shows an open or shorted condition Check connectors Check continuity on all harnesses for broken wires or loose connections Replace suspected back or base positioning sensor Repair faulty connector s Replace harness es Midmark Corporation 2010 SF 1941 Revised 7 16 2013 JS Elevance Chair Troubleshooting Chart continued Check Solution Check for broken wires and loose connections for back up solenoid at J1 connector on Chair PCB Repair or replace harnesses or connections Open
38. ler Step 1 Use LIN Coupler to check connectors A Unplug LIN connections from the LIN coupler B Remove two screws and the metal cover from the LIN coupler WARNING Use caution when operating equipment with covers removed a Step 2 Check for faulty O outgoing harness Replace O if the I incoming harness illuminates the LED when plugged into either side p Step 3 Check for a faulty LIN Coupler The LIN coupler is faulty if the I harness illuminates the LED ONLY when plugged into the LED side Step 4 Check for a faulty I harness Replace the I harness if it does not illuminate the LED when plugged into either side Note This check is only valid when power is present in the harness DA3831i O Midmark Corporation 2010 SF 1941 Revised 3 7 2013 30 Jg PC Board Wiring Diagram Harnesses amp Information PC Board Information EL Chair Back K Outputs PC Board Description LED EP includes harness ee 12 VDC 4 Di2 Back Up D12 K5 Pump R D13 Triac TH Work EE Di COM J Ly LI WH NC NO Lower Base Wc No WH Lower Upper Lift Cover Lift Cover Rotational Brake Solenoid 115 or 230 V Rotational Brake BK Indicator LEDs LED BK GN YIS GNYL y Brake comes on when break pedal is D15 pressed OK comes on when both limit switches D17 J5 and J6 are closed
39. ll move to the programmed coordinates stored for that button Note The chair can be stopped any time during a programmed positioning sequence by pressing any other button on the control device MIDMARI lt A N OO Position UM Buttons Ss DA2069_a Midmark Corporation 2010 SF 1941 Revised mo dd yr 15 Always verify model amp serial number Chair Calibration and the Override Function Chair Calibration is an automated routine of software controlled outputs working with continuous sensory inputs that keep the chair moving with precision within an acceptable range of extents The Override function allows a user to move the chair anytime it is powered by bypassing software directed chair movements See following page for a more detailed description of how this system works Hydraulics Electrical Power ON indicator If light is OFF see Power to the Chair Program Dipswitches and Test C Back Tilt Button Sensor N o PROGSW TEST pect
40. lve VIEW Throttl Valve Prope Check From Valve B D Valve Base Down Base Up Base Up Pump Note The Throttle Valves have been set by the factory and normally will not require adjustments Throttle Valve Settings Number of Turns OPEN from the FULLY CLOSED position Throttle Valve Chair Only Chair w L R or Console TV1 Base Up 3 Full turns 5 1 2 Full turns 2 3 4 Full turns 4 1 2 Full turns 1 1 2 Full turns 5 1 2 Full turns 5 Full turns Valves Base TV2 Base Down 3 1 4 Full turns TV5 Base Damper 3 Full turns Valves TV3 Back Up 1 1 2 Full turns Back TV4 Back Down 5 1 2 Full turns TV6 Back Damper 5 Full turns Back Solenoid Valves Midmark Corporation 2010 SF 1941 Revised 03 24 2011 36 Back Throttle Base Solenoid Valves To Reservoir Pressure prom Relief Pump Valve BOTTOM VIEW To amp From Back Cylinder SV2 To amp From Base Down Base Up Base Solenoid Solenoid Cylinder Back Down Back Up Solenoid Solenoid DA2826i Description Purpose Of Component Pressure PRV Opens returning hydraulic fluid directly to reservoir if pressure in hydraulic Relief Valve system exceeds maximum allowable limit Preset at factory do not change Dambars Base TV5 Act as hydraulic cushions when raising or lowering base or back for a smooth P Back TV6 stop and start ADJUSTED AT THE FACTORY should not require adjustments Check Valves CV1 Base Prevents hydraulic fluid
41. mote 29 Verifying LIN Connections 30 d Qu v iem D p lem Cl Indicates multiple pages due to model serial number break s Midmark Corporation 2010 SF 1941 Revised 9 29 2011 1 JS Elevance Chair Troubleshooting Chart Condition Check Solution Nothing happens when any button on any Green power ON indicator light located on the chair base is illuminated Chair does not have power if green power ON indicator light is not on control is pressed No relays can be heard energizing Verify facility circuit breaker is not tripped Determine why breaker tripped Correct issue and reset breaker Fuse s F1 F2 or F3 on Chair PC Board are blown or open Replace bad fuse s Refer to PC Board wiring diagram Check for loose wire connections Verify line voltage at J3 connection on the chair control PC Board Tighten loose connections and refer to PC Board wiring diagram to determine loss of power at J3 If using a wireless remote Check batteries Replace depleted batteries with new ones 1 Verify power cord is plugged in Plug in power cord 9 4 5 1 2 Check battery leaf spring contacts Remove batteries and straighten leaf springs to ensure that they make good contact with battery Reference battery contacts illustration Chair has power but control buttons still do not operate chair 4 Verify chair is
42. on was pressed to the chair PC board Outputs are activated in this sequence 1 Pump Relay D13 2 Pump Triac D1 3 Back Up Relay D12 The PC board supplies 115 V VAC to turn the Pump on then 115 V VAC to the Back Up Solenoid to open the Back Up valve As the Pump Motor runs fluid is pumped thru the open Back Up valve filling the back cylinder extending the shaft and raising the back The PC board monitors sensory devices throughout the chair and determines if all pre conditions required for the function are met Back continues up until 1 Back Up button is released 2 Back reaches upper extent 3 Thermal overload on the pump trips Thermal overload switch resets after approximately ten minutes cooling time Motion stops in this sequence 1 Back Up Relay D12 turns off 2 Pump Triac D1 turns off 3 If no further movement after a few seconds the Pump Relay D13 turns off Back Down When a Back Down button is pressed the control device senses the command and converts it to an electronic signal This signal is sent thru the air to the remote control base antenna if wireless remote button was pressed or by wire if wired control button was pressed to the chair PC board If all safety bail limit switches are closed the Back Down Relay D11 is activated The PC board supplies 115 V VAC to the Back Down Solenoid which opens the Back Down valve Gravity pulls the hydraulic fluid out of the
43. oughout the chair and determines if all pre conditions required for the function are met Base continues up until 1 Base Up button is released 2 Base reaches upper extent 3 Thermal overload on the pump trips Thermal overload switch resets after approximately ten minutes cooling time Base Down When a Base Down button is pressed the control device senses the command and converts it to an electronic signal This signal is sent thru the air to the remote control base antenna if wireless remote button was pressed or by wire if wired control button was pressed to the chair PC board The PC board supplies 115 V VAC to the Base Down Solenoid which opens the Base Down valve Gravity pulls the hydraulic fluid out of the base oylinder into the oil tank lowering the base cylinder shaft and the base Base continues down until 1 Base down button is released 2 Base reaches lower extent 3 Collision Protection System activates Note The PC Board constantly monitors safety limit switches and sensory devices on the chair The Collision Protection System activates when a chair cover equipped with a safety limit switch hits an object as it is moving down The chair stops and raises slightly to disengage contact The chair also beeps until the control button is released Normal operation can resume once the object is removed and the safety limit switch becomes inactive Midmark Corporation 2010 SF
44. s down from elevated position Check Look for obstructions that are 1 contacting the covers or cuspidor if applicable 2 actuating limit switches and 3 removing power from hydraulic functions Verify connections on safety bail limit switches are secure and on correct terminals If a cuspidor is not installed a jumper must be in place on J6 on Chair PC Board NOTE The normally closed safety bail limit switches open when the chair back or shrouds are deflected and the actuator bracket moves away from the switch Verify connections on cuspidor safety limit switch are secure and on correct terminals NOTE The normally open cuspidor safety limit switch is tripped closed with cuspidor in normal operating position The switch opens when cuspidor is deflected Throttle Valve TV2 turned in too far or closed on hydraulic solenoid valve assembly Base Down solenoid coil has open winding or a loose or broken lead Base Down solenoid valve is stuck in CLOSED position or clogged preventing hydraulic fluid flow back to reservoir On Chair PCB LED D9 by K1 Relay should be ON Line voltage should be present at J1 terminals 1 and 2 to Base down solenoid Look for obstructions that are 1 contacting the covers or cuspidor if applicable 2 actuating limit switches and 3 removing power from hydraulic functions Verify connections on safety bail limit switches are secure and on correct terminals If a cuspidor is not installed a jumper mus
45. service technician To recall a programmed position Press desired Position Button 1 2 3 or 4 DA2069_a Midmark Corporation 2010 SF 1941 Revised mo dd yr 28 Synchronize the Wireless Remote If nothing happens when any button on the Wireless Remote is pressed and no led lights on the PC board flash the remote either needs new batteries or needs to be synchronized To synchronize the remote Chair must be Powered ON Verify that Chair has been calibrated Refer to Chair Calibration procedure in Installation Guide 003 1923 99 Remove Upper Arm Lift Cover and the PC Board cover two screws Locate the S2 PROG SW on the PC board and set the dipswitch 4 to the ON position Listen for two beeps Press and hold buttons 2 and 3 on the remote within three seconds from moving dipswitch 4 Listen for three short beeps from the Chair then three beeps from the Remote 6 Set dipswitch 4 to the OFF position to complete the synchronization process 7 Replace PC Board amp Upper Arm Lift covers Push in with a screw driver to release clips and lift Upper Arm Chair PC Lift Cover up to free front clips Board from shaft Lift Cover must be removed to access PC Board DA2551i Dipswitch 4 Midmark Corporation 2010 SF 1941 Revised 7 16 13 Battery Contacts 29 Leaf Springs JS Verifing LIN Connections LIN Coup
46. t be on J6 on Chair PCB NOTE The normally closed safety bail limit switches open when the chair back or shrouds are deflected and the actuator bracket moves away from the switch Verify connections on cuspidor safety limit switch are secure and on correct terminals NOTE The normally open cuspidor safety limit switch is tripped closed with cuspidor in normal operating position The switch opens when cuspidor is deflected Check hydraulic motor pump internal thermal overload Check continuity between white and red motor leads and then between yellow and red motor leads Hydraulic fluid in oil reservoir is low Hydraulic motor pump leads are disconnected or loose Capacitor on hydraulic motor pump weak or inoperative Line voltage to chair is low Line voltage should be between 110 0 to 126 0 VAC on a 115 VAC unit or 220 to 252 VAC on a 230 VAC unit Pressure relief valve is open or leaking If excessive hydraulic fluid is returning to reservoir through the vent tube of base cylinder then cylinder is leaking past its piston seals Solution Remove obstructions Connect harnesses correctly and verify that a jumper is on J6 if there is no cuspidor Connect harnesses correctly Adjust TV2 throttle valve Travel time from end point to end point should be 20 seconds 1 sec with 180 Ibs 82 kg on chair Repair wires and connections Replace hydraulic solenoid valve assembly Replace Chair PC Board Remove obstructions
47. t spring is detached or broken Back is designed to lower from top to bottom in 15 Repair or replace back lift spring seconds with 80 Ibs 82 kg load Hydraulic Pump is too noisy during BACK Restriction in suction line from oil reservoir resulting in some cavitation Repair or replace tubing or BASE UP functions Check for kinks in tubing and restrictions in suction line Internal parts failure in hydraulic motor pump Replace hydraulic motor pump Rotational brake not working 1 Press brake pedals individually and check LED D2 turns on Repair connections or replace harness If LED D2 does not turn on then check for switch or wiring issues D2 on indicates switch pedal activated D17 on indicates solenoid activated Press brake pedals individually and check LED D15 turns on Check for a physical obstruction at the brake pin or a missing broken If LED D15 turns on then verify you can hear the solenoid energize spring If LED D15 does not turn on then test brake solenoid J16 by moving plug to AUX J2 on the PC Board a good solenoid will energize immediately Do not leave it plugged in for more than a few seconds to test it Rotational brake will not release Loose connections or short in brake solenoid harness to J2 on Chair PCB Repair connections or replace harness Verify continuity on brake solenoid coil If coil shows open continuity then replace solenoid Rotational brake will not lock Spr
48. three different DC or voltages to the appropriate 230 V VAC connectors Facility Power 115 V VAC or 230 V VAC 115 V VAC Regulated DA3130i or V VDC YLIGN 230 V VAC side side Color Abbreviation Chart Midmark Corporation 2010 SF 1941 Revised 6 6 11 6 Always verify model amp serial number Power to the Chair Facility Power When the power cord is properly connected facility power supplies 115 V VAC or 230 V VAC to the power inlet on the PC board Power Inlet Supply voltage 115 V VAC or 230 V VAC comes thru the power inlet and passes thru three fuses on its way to the transformer Transformer Supply line voltage 115 V 115 VAC or 230 V VAC enters the transformer where it passes thru or is regulated to multiple lower V VDC voltages by three regulators Regulators hardware Electronic devices that regulate incoming 115 V VAC or 230 V VAC into more stable V VDC voltages used by the PC board PC Board Circuitry on the PC board provides pathways for voltages to connected components as well as pathways for input signals to and from the micro controller Micro controller software The micro controller processes input signals received from users and sensors then sends the appropriate output signals to activate electronically controlled components Models 153810 Serial Numbers all 115 V VAC or 230 V VAC Supply volta
49. too low Check supply line voltage at source Voltage should be between 110 0 to heavier loads 126 0 VAC on 115 VAC units or 220 to 252 VAC for 230 VAC units 2 Weak capacitor on hydraulic motor pump Replace capacitor with a known good capacitor of same voltage and gie moves slowly or not at all under heavier manufactured rating oads Patient weight exceeds maximum limitation of 450 Ibs 204 kg Follow maximum weight limitations Hydraulic fluid is leaking past hydraulic pressure relief valve Excessive fluid is flowing Replace hydraulic solenoid valve assembly back to reservoir during operation 5 Hydraulic cylinder s leaking past piston seals visible by excessive fluid returning to oil Replace hydraulic cylinder s reservoir thru vent tubing BASE DOWN travel is too slow or too fast 1 Base down TV2 Throttle valve is either turned in too far restricting flow back to Adjust TV2 Throttle Valve Travel time from end point to end point should reservoir or not turned in enough allowing too much flow causing a faster descent be 15 seconds 1 sec with 180 Ibs 82 kg on chair BACK DOWN travel is too slow or too fast 1 Back down TVA Throttle valve is either turned in too far restricting flow back to Adjust TV4 Throttle Valve Travel time from end point to end point should reservoir or not turned in enough allowing too much flow causing a faster descent be 20 seconds 1 sec with 180 lbs 82 kg on chair 2 Back lif
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