adec 511 dental chair service manual

The A-dec 500 dental chair is rated to 500 lb (227 kg) maximum patient load.Hydraulic dental chairs offer quiet operation with lots of power. The A-dec 500 dental chair has a robust hydraulic base lift and back tilt system which results in gentle stops and starts during patient positioning. You can customize your dental chair with many different equipment options. Request a quote from your local A-dec dealer. A-dec is pleased to offer a 5-year warranty for all dental equipment and furniture purchased from an authorized A-dec dealer. Additionally, A-dec offers a 10-year warranty on hydraulic dental chair cylinders (tilt and lift). See Regulatory Information, Specifications, and Warranty for full warranty information. A-dec recommends cleaning the upholstery using a solution of mild, non-ionic detergent and water, or commercially available cleaners containing no alcohol, bleach, or ammonia. Get more information in the A-dec Upholstery Maintenance Guide. Replacement upholstery can be ordered through your local A-dec dealer. Get upholstery color and replacement upholstery information. To order replacement parts, please contact your local A-dec dealer. Daily and preventative maintenance will help keep your dental equipment running smoothly. Use the Dental Equipment Maintenance checklist for easy reference. Reference the A-dec 511 Dental Chair Instructions for Use for information about chair operation and adjustments. The information in this document is subject to change without notice. If you find any problems in the documentation, please report them to us in writing. A-dec Inc. does not warrant that this document is error-free. No part of this document may be copied, reproduced, altered, or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without prior written permission from A-dec Inc.

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Superior Patient Experience. Optimal Access. It ensures patient comfort even during long procedures. Request a demo. Unassumingly responsive. Predictable and intuitive. Experience the next level. Coupled with the virtual pivot, which synchronizes movement with the natural motion of the patient, there’s no readjusting when the chair is reclined or returned. The ultra-thin back allows you to work in a comfortable position—legs under the patient, elbows at your side. Access angles can make the difference between a long day and a good day. The headrest adjusts on the fly with the press of a lever for an optimal view of the oral cavity. Flip the patient chair armrests out of the way, and the shape of the baseplate allows you (and your team) to roll in closer to the patient and work in a comfortable, natural position. Supports patient weight when they need it, and moves out of the way when they don’t. All your patient feels is relaxed. Allows the doctor, regardless of height, to work comfortably. Handpieces—even electrics—feel light. Eliminates pull-back on the handpiece resulting in less fatigue. Easily retrieve and return handpieces and other instruments without taking your focus away from the oral cavity. The A-dec 500 12 o’clock duo delivery system supports left- and right-handed positioning for multiple operators and keeps instrumentation out of sight. With the A-dec 300 delivery system, the look is orderly and clean, yet accessible. A clearer view of tooth surfaces. Reduced eyestrain. Less fatigue. Increase case acceptance when you incorporate the use of an intraoral camera with a chairside monitor. Programmable cup fill and bowl rinse timers.Request a demo to experience everything the new A-dec 500 has to offer. With proper maintenance and service, A-dec dental chairs are designed and tested for a “service life” of 20 years under normal use. Please review A-dec’s customer warranty for complete details, including applicable disclaimers and limitations of liability.

Electronic Documentation The latest versions of A-dec documents are available as electronic documents on the A-dec website ( On the website, select Document Library in the upper-right corner of the page. Check this location for the most current technical information about A-dec products. 5 A-dec Dental Chairs A-dec 311 (Version A) Dental Chair A-dec 311 (Version B) Dental Chair An optional contoured floor box is also available. Electrostatic Discharge (ESD) precautions are required when touching a circuit board or making connections to or from the circuit board. Electrostatic Discharge (ESD) precautions are required when touching a circuit board or making connections to or from the circuit board. WARNING Failure to turn off the power before you begin this procedure can lead to product damage and result in serious injury or death. CAUTION When removing or replacing covers, take care not to damage any wiring or tubing. Verify that the covers are secure after replacing them. Grasp the cover on both sides and pull up. If needed, use a large coin in the integrated coin slot to gently separate the contoured floor box cover from the frame. Then remove the power supply cover. 2. With your thumbs on the top of the upper lift arm cover, grasp from the bottom and pull up and push in to disengage tabs from slots. Coin Slot 3. Lift out the upper lift arm cover. 4. Remove the lift arm and lower lift arm cover. CAUTION Take care not to damage the cover when using the coin slot. To reattach, place the key holes in the armature over the large fastener heads, then push down until the upholstery inserts into position. CAUTION When replacing the upholstery, ensure the pins are completely in place. The pin ring should be flush with the Armature seat armature. To reattach, position the headrest to access the screws, place the upholstery on the headrest, insert and tighten the screws. Improper installation will limit the chair s functionality.

Trademarks and Additional Intellectual Property Rights A-dec, the A-dec logo, A-dec 500, A-dec 300, Cascade, Cascade Master Series, Century Plus, Continental, Decade, ICX, ICV, Performer, Preference, Preference Collection, Preference ICC, and Radius are trademarks of A-dec Inc.A-dec 400, A-dec 200, Inspire, Preference Slimline, and reliablecreativesolutions are also trademarks of A-dec Inc. None of the trademarks or trade names in this document may be reproduced, copied, or manipulated in any manner without the express, written approval of the trademark owner. Certain touchpad symbols are proprietary to A-dec Inc. Any use of these symbols, in whole or in part, without the express written consent of A-dec Inc., is strictly prohibited. Product Service For product service information, please contact your local authorized A-dec dealer. Modifications identified by a change to the product version include, but are not limited to, significant changes to features and options, and product compatibility. Models Versions Description 311 A, B Dental Chairs 411 A Dental Chairs 511 A Dental Chairs Rev B Overview 3 4 A-dec 311, 411, and 511 Dental Chairs Service Guide Overview 4 Customer Service Information For questions not addressed in this document, contact A-dec Customer Service using contact information for your region. The service reference contains illustrated parts breakdown content. Circuit board components and flow diagrams are in both documents. Circuit board components and flow diagrams are in both documents. These documents include cuspidors, floor boxes, and support centers. Circuit board components and flow diagrams are in both documents. This catalog details service parts for current products and products which are no longer manufactured but are still supported. Refer to this catalog for additional details on parts found in the service guide.

(See page 19.) Overflow Bottle NOTE Allow the chair to settle before operating. This allows the air bubbles to separate from the oil. If you use the chair and it makes noises, repeat steps 1 through 10 above. There are three specific capacitors for different line voltage ranges. The chair motor capacitor can be replaced within the power supply. Before March 2013 Effective March 2013 DANGER Turn off the power to the system before you continue with this procedure. Failure to do so can result in electrical shock. WARNING Turn off the power to the system before you continue with this procedure. A diagnostic LED is provided on the chair board for each position sensor. Refer to Chair Circuit Board LED Identification, see page 12 for information. An additional LED, indicating power, is present on each position sensor circuit board. There is a position sensor for the back and a position sensor for the base. CAUTION The position sensors can be inadvertently installed upside down. Improper installation will limit the chair s functionality. Factory Default Routine If a position sensor or chair board is replaced, run the factory default. For instructions on running the factory default, see page 19. Limp Along Feature There are two position sensors, one for the base of the chair and one for the back of the chair. If there is a problem or malfunction with a position sensor, the limp along feature allows the operator to move the chair in the up direction for one to three second intervals by pushing the manual control buttons on the touchpad or footswitch. Refer to Chair Circuit Board LED Identification on page 12 for further information. Magnetic Pull Test for Coil Resistance 1. Hold a paper clip loosely in your hand. 2. Activate the solenoid by pressing base down on the footswitch or touchpad. 3. If there is a pull on the paper clip, the solenoid is being energized. Failure to do so can result in electrical shock.

After installing a new chair, circuit board, or position sensor, run the factory default routine. The routine: Sets the chair base and back upper limits Calculates new preset positions based on actual range of motion of the chair Verifies that the position sensors work correctly To start the factory default routine, place the spare jumper in the factory default position on the P3 test points of the chair circuit board. Jumper in Factory Default Position CAUTION Circuit boards are sensitive to static electricity. Electrostatic Discharge (ESD) precautions are required when touching a circuit board or making connections to or from the circuit board. Once the routine completes, place the jumper into the Spare position on P3. NOTE The jumper must remain in the factory default position to complete the factory default routine. The status LEDs on the standard and deluxe touchpads and the chair circuit board double blink while the factory default routine is running and after the routine is complete. When the routine is complete, three beeps sound. If the routine stops prematurely, one beep sounds. BACK NOTE One beep indicates the routine failed to complete. An electro-mechanical tilt actuator controls the back movement. Turning the screw clockwise (tightening) decreases the base down speed. Turning the screw counterclockwise increases the base down speed. Hydraulic Motor Pump Assembly Base Down Adjustment Screw Chair Manifold Assembly NOTE Do not over tighten the adjustment screw. NOTE It may be difficult to measure exactly to the thread level. You may want an absorbent towel available to soak up some of the fluid if it seems too full. 3. Fill the hydraulic fluid to the plug thread level. 4. Replace the fill plug. 5. Lower the chair fully. The overflow bottle will capture any excess fluid. 6. Raise the chair. 7. Remove the overflow bottle from the bracket. 8. Empty the overflow bottle. 9. Return the overflow bottle to the bracket. 10. Run the factory default routine.

Push the pins through the seat upholstery and chair frame until the rings touch the seat, then reinstall the covers. The headrest upholstery installs the same way for both styles. The locking knob headrest is shown. To remove the headrest upholstery, position the headrest to access the two screws on the back, loosen the screws, and remove the upholstery. To reattach, position the headrest to access the screws, place the upholstery on the headrest, then insert and tighten the screws. An electro-mechanical tilt actuator controls the back movements. To slow the base down, turn the set screw clockwise. The system is leak-free during transportation, storage, and operation. The hydraulic system consists of hydraulic fluid reservoir, hydraulic cylinders, and motor-driven hydraulic pump with solenoids. You can see through the translucent material to determine the fluid level in the reservoir. Add hydraulic fluid to the reservoir: 1. Raise the chair to the full base up position. 2. Fill the reservoir with hydraulic fluid to the top of the fluid level indicator. CAUTION Do not overfill. Improper installation will limit the chair s functionality. After installing a new chair, circuit board, or position sensor, run the factory default routine. The routine: Sets the chair base and back upper limits Calculates new preset positions based on actual range of motion of the chair Verifies that the position sensors work correctly To start the factory default routine, place the spare jumper in the factory default position on the P3 test points of the chair circuit board. Jumper in Factory Default Position CAUTION Circuit boards are sensitive to static electricity. Electrostatic Discharge (ESD) precautions are required when touching a circuit board or making connections to or from the circuit board. Once the routine completes, place the jumper into the Spare position on P3. NOTE The jumper must remain in the factory default position to complete the factory default routine.

The status LEDs on the standard and deluxe touchpads and the chair circuit board double blink while the factory default routine is running and after the routine is complete. When the routine is complete, three beeps sound. If the routine stops prematurely, one beep sounds. BACK NOTE One beep indicates the routine failed to complete. There are three specific capacitors for different line voltage ranges. The chair motor capacitor can be replaced within the power supply. DANGER Turn off the power to the system before you continue with this procedure. Failure to do so can result in electrical shock. WARNING Turn off the power to the system before you continue with this procedure. Reference the chart below to identify the location of actuators and switches. There is a position sensor for the back and a position sensor for the base. CAUTION The position sensors can be inadvertently installed upside down. Improper installation will limit the chair s functionality. A diagnostic LED is provided on the chair board for each position sensor. Refer to Chair Circuit Board LED Identification, see page 12 for information. An additional LED, indicating power, is present on each position sensor circuit board. Factory Default Routine If a position sensor or chair board are replaced, run the factory default. For instructions on running the factory default, see page 32. Limp Along Feature There are two position sensors, one for the base of the chair and one for the back of the chair. If there is a problem or malfunction with a position sensor, the limp along feature allows the operator to move the chair in the up direction for one to three second intervals by pushing the manual control buttons on the touchpad or footswitch. Refer to Chair Circuit Board LED Identification, page 12 for further information. When in limp along mode, presets will not function. Magnetic Pull Test for Coil Resistance 1. Hold a paper clip loosely in your hand. 2.

WARNING Turn off the power to the system before you continue with this procedure. CAUTION Circuit boards are sensitive to static electricity. Electrostatic Discharge (ESD) precautions are required when touching a circuit board or making connections to or from the circuit board. Circuit boards should be installed only by an electrician or qualified service person. WARNING Lower the chair base to the mechanical limit before removing the solenoid. DANGER Turn off the power to the system before you continue with this procedure. Failure to do so can result in electrical shock. WARNING Turn off the power to the system before you continue with this procedure. Remove the Solenoid Assembly: When replacing a solenoid wipe up any fluid and replace existing O-rings on the solenoid base. 1. Remove the utility cover(s). 2. To minimize pressure in the hydraulic system, lower the chair base to the mechanical limit 3. Disconnect the solenoid from the chair circuit board terminal strip J7. 4. Loosen the nut on the solenoid and use a screw driver to remove the solenoid assembly. Install the New Solenoid Assembly: 1. Install the new solenoid. 2. Reconnect the solenoid to the chair circuit board, terminal strip J7. It does not matter which solenoid wire goes into which terminal. To reposition, place your thumb against the neck support armature and pull the cushion out from the track. Flip the cushion around and insert it back into the track. The cushion includes a graphic on the back that depicts proper orientation for shorter or taller patients. The locking knob allows you to adjust the headrest for a full range of positions. Release the headrest by turning the locking knob to the left, then adjust the headrest for a proper fit. Lock the headrest in the desired position by turning the knob to the right. For minor height adjustment, slide the headrest cushion up and down. For additional height adjustment, reposition the glide bar.

Glide Bar Tension Adjustment A dual-articulating headrest may be difficult to move or may drift downward because of the amount of tension on its glide bar. The armrests can also be locked into the upright position. Armrests Locking The armrests can be unlocked from the upright position. Effective October 2012 Effective October 2012 Stop Screw in Front for Positional Armrest Stop Screw in Back for Locked Armrest Before October 2012 Before October Rev B 311 (A) Chair Service, Adjustments, and Maintenance 27 28 A-dec 311, 411, and 511 Dental Chairs Service Guide 311 (B) and 411 Chairs Service, Adjustments, and Maintenance (B) and 411 Chairs Service, Adjustments, and Maintenance Chair Covers Remove the chair motor pump, lift arm and stop plate covers in the following order: CAUTION When removing or replacing covers, take care not to damage any wiring or tubing. Verify that the covers are secure after replacing them. 1. Motor Pump Cover: Remove the screw from each side of the cover and lift up. 2. Lift Arm Cover: Position the chair so it is raised half way up. Pull one side of the cover until it releases from the lift arm. To replace, align one side of the cover with the lift arm and insert it into place. Ensure both sides are firmly attached. 3. Stop Plate: Pull one side of the cover until it releases from the lift arm. To replace, slide one side of the cover over the post on the lift arm and attach. To remove the back, firmly grasp the bottom edge of the cushion and lift up, then lift the upholstery out and away from the chair back support. To reattach the back upholstery, place the key holes on the cushion over the large fastener heads, then push down until it inserts into position. Remove the pins that are under the chair frame, then lift upholstery off of the frame. To reattach, move the armrests forward, line up the holes in the seat upholstery with the holes in the chair frame.

Activate the solenoid by pressing base down on the footswitch or touchpad. 3. If there is a pull on the paper clip, the solenoid is being energized. Failure to do so can result in electrical shock. WARNING Turn off the power to the system before you continue with this procedure. ESD precautions are required. The circuit board should be installed by an electrician or qualified service personnel. WARNING Lower the chair base to the mechanical limit before removing the solenoid. 4. Loosen the nut on the solenoid and use a screw driver to remove the failed solenoid assembly. NOTE Cover the solenoid with a rag. Fluid is still under pressure when removing the solenoid. 5. Wipe up any fluid and replace existing O-rings on the solenoid base. Remove the Solenoid Assembly: When replacing a solenoid wipe up any fluid and replace existing O-rings on the solenoid base. 1. Remove the utility cover(s). 2. To minimize pressure in the hydraulic system, lower the chair base to the mechanical limit. DANGER Turn off the power to the system before you continue with this procedure. Failure to do so can result in electrical shock. WARNING Turn off the power to the system before you continue with this procedure. Install the New Solenoid Assembly: 1. Install the new solenoid. 2. Reconnect the solenoid to the chair circuit board, terminal strip J7. It does not matter which solenoid wire goes into which terminal. If the object becomes lodged, press the base up button on the footswitch or touchpad. Remove the object and resume normal chair operation. WARNING Be sure to turn off power to the chair and disconnect it from its power source before replacing the stop switch. BASE BACK CAUTION Use cable ties to secure wires to the lift arm to prevent kinking and pinching. The locking knob allows you to adjust the headrest for a full range of positions. Release the headrest by turning the locking knob to the left, then adjust the headrest for a proper fit.

Lock the headrest in the desired position by turning the knob to the right. For minor height adjustment, slide the headrest cushion up and down. For additional height adjustment, reposition the glide bar. To adjust each armrest: 1. Remove the chair side cover by pulling on the left and lower right sides of the cover. The chair swivel brake locks the chair in the selected position. To engage the brake, push the brake lever firmly to the left. To release the swivel brake, push the brake lever to the right. NOTE The 311 (Version B) Dental Chair may not have the swivel break feature. Swivel Brake Tension Adjustment If the chair swivels left or right with the brake engaged, or is difficult to move with the brake disengaged, adjust the swivel brake tension. Properly tensioned, the brake handle should be in the middle when it is fully engaged. Only a small adjustment is needed to significantly increase or decrease tension. NOTE To disable the swivel feature, reinstall the shipping pin. A-dec 411 Shown Hex Key Rev B 311 (B) and 411 Chairs Service, Adjustments, and Maintenance 41 42 A-dec 311, 411, and 511 Dental Chairs Service Guide 511 Chair Service, Adjustments, and Maintenance Chair Service, Adjustments, and Maintenance Chair Covers (511) Remove the chair motor pump, lift arm and stop plate covers in the following order: CAUTION When removing or replacing covers, take care not to damage any wiring or tubing. Verify that the covers are secure after replacing them. 1. Motor Pump Cover: Remove the screws from each side and lift up. Rear Cover Assembly Left Side Cover 2. Lift Arm Cover: Position the chair so that it is raised half way up. Pull one side of the cover until it releases from the lift arm. To replace, align one side of the cover with the lift arm and insert it into place. Ensure both sides are firmly attached. 3. Stop Plate: Pull one side of the cover until it releases from the lift arm.

To replace, slide one side of the cover over the post on the lift arm and attach. To reattach the back upholstery, place the key holes on the cushion over the large fastener heads, then push down until it inserts into position. To reattach the headrest upholstery, position the headrest to access the screws, place the upholstery on the headrest, then insert and tighten the screws. CAUTION Do not remove the positioning mechanism screws or plate. The brake assembly will fall out. To reattach, place the two seat upholstery hooks under the chair carriage, then push the toeboard back and down until the lock is through the seat frame. Insert the clip into the lock Rev B 511 Chair Service, Adjustments, and Maintenance 43 44 A-dec 311, 411, and 511 Dental Chairs Service Guide 511 Chair Service, Adjustments, and Maintenance 44 Factory Default Routine (511) After installing a new chair, circuit board, or position sensor, run the factory default routine. The routine: Sets the chair base and back upper limits Calculates new preset positions based on actual range of motion of the chair Verifies that the position sensor work correctly To start the factory default routine, place the spare jumper in the factory default position on the P3 test points of the chair circuit board. CAUTION Circuit boards are sensitive to static electricity. Electrostatic Discharge (ESD) precautions are required when touching a circuit board or making connections to or from the circuit board. Circuit boards should be installed only by an electrician or qualified service person. When running the factory default routine the chair: 1. Moves base down 2. Moves base up 3. Moves back down 4. Moves back up 5. Moves base and back to Position 0 6. Beeps three times NOTE One beep indicates the routine failed to complete. See page 56 for troubleshooting. NOTE The jumper must remain in the factory default position to complete the factory default routine.

The status LEDs on the standard and deluxe touchpads and the chair circuit board double blink while the factory default routine is running and after the routine is complete. When the routine is complete, three beeps sound. If the routine stops prematurely, one beep sounds. Jumper in Factory Default Position 45 Chair Drive System (511) Hydraulic Cylinders The hydraulic cylinders operate during the base up and back up functions. Springs and gravity retract the piston during base down and back down functions. Motor Driven Hydraulic Pump During base and back up functions, the hydraulic pump transfers hydraulic fluid from the reservoir to the base and back hydraulic cylinders. Solenoids, mounted to the pump assembly, control the flow of hydraulic fluid back to the reservoir during base and back down functions. NOTE You cannot adjust the speed of the chair Rev B 511 Chair Service, Adjustments, and Maintenance 45 46 A-dec 311, 411, and 511 Dental Chairs Service Guide 511 Chair Service, Adjustments, and Maintenance 46 Hydraulic System (511) The hydraulic system deactivates automatically at the upper and lower extremes of travel. The system is leak-free during transportation, storage, and operation. The hydraulic system consists of hydraulic fluid reservoir, hydraulic cylinders, and motor-driven hydraulic pump with solenoids. You can see the fluid level in the reservoir through the sides of the reservoir. Add hydraulic fluid to the reservoir: 1. Raise the chair to the full base up and back up position. 2. Fill the reservoir with hydraulic fluid to the top of the fluid level indicator. CAUTION Do not overfill. 3. Move the chair down and up after fluid has been added. Magnetic Pull Test for Coil Resistance 1. Hold a paper clip loosely in your hand. 2. Activate the solenoid by pressing base down or back down on the footswitch or touchpad. 3. If there is a pull on the paper clip, the solenoid is being energized. Failure to do so can result in electrical shock.

WARNING Turn off the power to the system before you continue with this procedure. Electrostatic Discharge (ESD) precautions are required when touching a circuit board or making connections to or from the circuit board. Circuit boards should be installed only by an electrician or qualified service person. WARNING Lower the chair base to the mechanical limit before removing the solenoid. Remove the Solenoid Assembly: When replacing a solenoid wipe up any fluid and replace existing O-rings on the solenoid base. 1. Remove the utility cover(s). 2. To minimize pressure in the hydraulic system, lower the chair base and back to the mechanical stops. DANGER Turn off the power to the system before you continue with this procedure. Failure to do so can result in electrical shock. WARNING Turn off the power to the system before you continue with this procedure. Install the New Solenoid Assembly: 1. Insert the new solenoid and fasten it with the four screws. 2. Reconnect the solenoid connector. 3. Turn on the power. 4. Run the chair through its full range of motion to check for leaks. 5. Reinstall the utility cover. Solenoid Connector Rev B 511 Chair Service, Adjustments, and Maintenance 49 50 A-dec 311, 411, and 511 Dental Chairs Service Guide 511 Chair Service, Adjustments, and Maintenance 50 Position Sensors (511) The position sensor and cable assembly eliminates position float (a slight change or variation in the pre-programmed positions). The chair uses the same position sensor assembly for both lift and tilt requirements. If a position sensor fails, the limp-along feature allows the operator to position the chair for one second intervals by pushing the manual control buttons on the touchpad or footswitch. Base Position Sensor Back Position Sensor 51 Chair Stop Plate (511) Stop Switch If an object presses against the chair stop plate as the chair is lowered, a stop switch will interrupt and reverse the chair motion.