Limit Arm Installation procedure

Limit Arm Installation procedure
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Mirage!Model!4000!
Hydraulic!Patient!Chair!
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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!
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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.!!
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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.!!
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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!
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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.!!
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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.!!
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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.!!
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6. Remove!the!set!screw!that!attaches!the!opposite!side!of!the!potentiometer!arm!to!
potentiometer.!!
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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.!!
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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.!
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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.!!
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13. Now!you!may!tighten!the!set!screw!back!on!the!potentiometer.!
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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.!!
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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.
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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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