! Mirage!Model!4000! Hydraulic!Patient!Chair! ! Limit!Arm!Installation! TPC$ 18525 E. Gale Ave City Of Industry, CA 91748 P626-810-4337 Fax 626-810-4245 www.tpcdental.com Caution!!Protect!your!eyes!and!body!parts!when!working!in!this!area!of!the!dental!chair.!Most!of! the!time!the!potentiometer!arm!replacement,!is!due!to!the!arm!wrapping!around!the!return! ! springs!of!the!dental!chair.!If!you!potentiometer!arm!is!looped!in!with!the!spring!use!extra! caution!when!removing!it.!As!the!spring!can!come!loose!and!cause!injury.!! 1. Remove!the!seat!cushion!from!the!dental!chair.!To!do!this,!remove!the!two!Allen! screws.!! ! 2. Locate!the!potentiometer!arm!to!be!replaced.!This!arm!runs!parallel!to!the!hydraulic! return!springs!on!the!left!side!of!the!chair!if!you!are!looking!into!it!from!the!toe.!! ! 3. Locate!the!main!PCB!board!under!the!pump!cover!of!the!chair.!Place!the!chair!in!service! mode!by!switching!S6!down.!When!this!happens!the!LED!below!the!switch!will! ! illuminate.!We!are!using!service!mode!because!if!there!is!damage!to!the!arm!the!chair! will!not!sense!its!position!and!the!chair!back!probably!does!not!move.!! ! 4. You!may!need!to!remove!the!side!cover!of!the!dental!chair!to!detach!the!arm!from!the! hydraulic!pin.!You!may!skip!this!step!if!you!have!a!Phillips!head!driver!with!a!90!degree! bend!on!it.!! ! 5. Remove!the!screw!from!the!hydraulic!pin!if!you!can’t!see!the!screw!recline!the!backrest! to!approximately!a!45!degree!angle.!Keep!alert!and!watch!for!anything!that!may! obstruct!the!arm!movement!such!as!the!return!springs.!If!the!screw!is!already!removed! or!sheared!off!then!attempt!to!remove!the!sheared!screw!from!the!hydraulic!pin.!! ! ! ! 6. Remove!the!set!screw!that!attaches!the!opposite!side!of!the!potentiometer!arm!to! potentiometer.!! ! ! 7. Remove!Arm.!Depending!on!the!condition!of!the!arm!you!may!need!to!also!remove!the! potentiometer!bracket!to!remove!the!arm.!! 8. Once!removed,!place!the!new!arm!in!the!chair.!ReYattach!the!screw!that!was!removed!in! step!5.!This!screw!attached!the!arm!to!the!hydraulic!pin.!! ! 9. Place!the!opposite!side!of!the!potentiometer!arm!back!on!the!potentiometer.!Do!not! tighten!the!set!screw!at!this!time.!! 10. Make!sure!to!observe!the!movement!of!the!arm!while!performing!this!step.!The!arm!has! a!pivot!point!that!should!always!pivot!up!NOT!DOWN.! ! ! 11. !Watch!for!any!obstructions!to!the!arm.!Also!make!sure!the!potentiometer!does!not! over!turn!it!self.!!This!will!be!able!to!be!determined!when!the!arm!travels!but!the!notch! on!the!opposite!side!of!the!pot!does!not!move.! 12. A!good!way!to!determine!the!location!and!settings!is!as!follows.!Use!the!foot!control!to! move!your!backrest!all!the!way!back.!Then!move!the!backrest!all!the!way!up.!Then!drop! your!backrest!to!where!it!looks!to!be!in!a!center!position.!Not!all!the!way!up!and!not!all! the!way!down.!Then!turn!the!potentiometer!all!the!way!in!one!direction!then!to!the! other.!Then!turn!it!to!locate!the!center!position.!! ! ! ! 13. Now!you!may!tighten!the!set!screw!back!on!the!potentiometer.! ! ! ! 14. Now!move!the!backrest!up!and!down!several!times!to!ensure!the!there!are!no! obstructions!and!the!arm!will!move!freely.!After!this!is!completed!you!will!need!to!set! the!new!limits!for!the!backrest.!! ! ! ! ! ! ! ! ! ! ! ! Setting!the!new!limits! 1.##Function# The Mirage Hydraulic Patient Chair does not use conventional mechanical or mercury limit switches. Motion of the chair base and backrest move variable resistances (potentiometers) making it possible for the control circuitry to continuously know the exact position of the base and backrest, not only when they hit the end of their travel. Adjustments for all four actions (seat raise/ lower, backrest raise/recline) are located on the control PCB. 2.##Adjustment#To!set!a!specific!limit!for!the!mirage!operatory!chair,!perform!the!following! instructions.!Remove!the!pump!cover!from!the!chair.!Locate!the!slider!switch!labeled!S1!and! slide!it!down.!Once!the!switch!is!activated!the!led!below!the!switch!will!be!illuminated.!The! switch!is!located!on!the!left!side!of!the!main!PCB!board.!This!will!put!the!chair!into!service! mode.!Use!the!touch!pad!or!foot!control!to!move!the!chair!to!the!desired!position.!See!below! for!detailed!instructions!on!setting!each!limit.!There!is!a!PCB!board!diagram!on!following!page.# Seat Lower Limit Using!the!manual!controls,!set!seat!height!to!the!position!where!the!lower!limit!is!set.!!Press!Lift! DO!on!the!main!PCB!board!to!program.!Reset!the!Slide!Switch!on!PCB!to!Normal.!Use!the!touc! pad!or!foot!control!to!move!the!chair!up,!and!then!use!the!lift!down!on!the!touch!pad!control!to! verify!that!the!new!limit!is!set.! Seat Height Limit Using the manual controls raise the seat height fully. At the physical top of travel, the motor will continue to run, but upward motion will stop (oil bypass channel has opened in cylinder). Lower the seat height slightly from this point, and press LIFT UP button on Control PCB. Reset the Slide Switch on PCB board to Normal. Then use the touch pad control to lower the chair, raise the chair and verify the desired height limit is set. ! Backrest Recline Limit Using the manual controls, Recline the backrest fully. Raise the backrest slightly from this point, and press the BACK DN button on the main PCB board. Reset the Slide Switch on PCB board to Normal. Then raise the back rest and then lower it to verify the desired setting is set. Backrest Up Limit Using!the!manual!controls,!raise!the!backrest!fully.!Then!lower!the!backrest!slightly!from!this! point.!Press!the!backup!button!on!the!main!PCB!board.!Reset!the!Slide!Switch!on!PCB!board!to! Normal.!Then!use!the!foot!control!disc!to!lower!the!backrest.!Raise!the!backrest!to!verify!the! desired!height!limit!is!set.! Main!PCB!Board!! ! ! !
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