A-Dec 500 Service guide
A-dec 500® Service Guide
Including ICV® and Clinical Products
Copyright
Regulatory Information
©2012 A-dec Inc. All rights reserved.
A-dec Inc. makes no warranty of any kind with regard to this material,
including, but not limited to, the implied warranties of merchantability and
fitness for a particular purpose. A-dec Inc. shall not be held liable for any
errors contained herein or any consequential or other damages concerning the
furnishing, performance or use of this material. 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.
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. and are
registered in the U.S. and other countries. A-dec 200, 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
trademarkowner.
Regulatory information is provided with A-dec equipment as mandated by
agency requirements. This information is delivered in the equipment’s
Instructions for Use or the separate Regulatory Information and Specifications
document. If you need this information, please go to the Document Library at
www.a-dec.com
.
Product Service
For service information, contact your local authorized A-dec dealer. To find
your local dealer, go to www.a-dec.com
.
Service Reference
This document is a companion to the A-dec 500 Service Reference
(p/n 86.0329.00). The Service Reference contains tubing, flow diagrams, and
illustrated parts breakdown content. Circuit board component information is
available in both this document and the Service Reference.
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.
A-DEC 500
S
ERVICE GUIDE
CONTENTS
1 INTRODUCTION........................................................1
Inside This Guide....................................................................1
Document Conventions.............................................................1
Get Support .....................................................................2
Customer Service....................................................................2
Other Sources of Information ...............................................2
Genuine A-dec Parts Catalog......................................................2
A-dec Dental Furniture Technical Packet........................................2
A-dec Illustrated Parts Breakdown ...............................................2
Electronic Documentation .........................................................2
Serial, Model Numbers, Color Identification .............................3
Serial and Model Numbers .........................................................3
Service Tools ....................................................................4
2 DENTAL CHAIR ........................................................7
Product Overview..............................................................8
A-dec 511 Chair......................................................................8
A-dec 511 Chair Specifications....................................................8
Load Capacity ........................................................................... 8
Power On/Off Button .................................................................. 8
Limp-Along Feature .................................................................... 8
Chair Power Supply .................................................................... 9
Service, Usage, and Adjustments ......................................... 10
Chair Covers ....................................................................... 10
Factory Default Routine..................... ....... ........ ....... ........ ....... 11
Chair Circuit Board Components................................................ 12
LED Identification .....................................................................14
The Hydraulic System ............................................................ 15
Hydraulic Fluid Reservoir ............................................................15
Hydraulic Cylinders ...................................................................16
Motor Driven Hydraulic Pump .......................................................16
Capacitor ..............................................................................17
Solenoids ...............................................................................18
Test Solenoids .........................................................................18
Magnetic pull ...........................................................................18
Coil resistance .........................................................................18
Potentiometer......................................................................19
Chair Stop Plate ...................................................................20
Chair Bump-Up Feature ..............................................................20
Swivel Brake Adjustment.........................................................21
Tension Adjustment ...............................................................21
Headrest Adjustment .............................................................22
3 PROGRAMMING ...................................................... 23
Status Icon .....................................................................24
Chair Positioning..............................................................24
Position Buttons....................................................................24
Program Chair Preset Positions ......................................................25
Customize the X-Ray/Rinse Button .................................................25
Cuspidor Functions...........................................................26
Cupfill ...............................................................................26
Customize Cupfill and Bowl Rinse...............................................26
Dental Light....................................................................27
Dental Light Auto Feature........................................................27
A and B Buttons....................................................................27
Electric Handpiece Settings (Deluxe Touchpad Only) .................28
Standard Mode Programming ....................................................28
Standard Mode Display Settings .................................................29
Forward/Reverse Button .............................................................29
Endodontics Mode .................................................................30
Endodontics Mode Settings.......................................................31
Technician Setup Options...................................................32
Using Touchpad Buttons for Navigation ........................................32
Holder Setup .......................................................................32
Technician Help Messages........................................................36
Touchpad Circuit Board Components.....................................37
Standard Touchpad................................................................37
86.0348.00 Rev A i
A-dec 500 and Clinical Products Service Guide Table of Contents ii
Deluxe Touchpad .................................................................. 38
4 DELIVERY SYSTEMS ................................................. 39
Delivery Systems Overview ...................................................... 39
Chair-Mounted Delivery Systems (532/533) ............................ 40
Product Overview (532/533) .............................................. 41
Service, Usage, and Adjustments (532/533) ........................... 42
Covers............................................................................... 42
Delivery System Cover ................................................................42
Delivery System Front Cover — Continental .......................................42
Whip Assembly..................................................................... 43
Continental Tray Holder (533 only)............................................. 43
Adjustments (532/533)........................................................... 44
Level Adjustment .....................................................................44
Tension Adjustment ...................................................................44
Front-to-Back Leveling ........................................................... 45
Side-to-Side Leveling ............................................................. 45
Side-Mounted Delivery Systems (542) ................................... 46
Product Overview (532/533/542 Common Feature)......................... 47
Service, Usage, and Adjustments (542) ................................. 48
Flexarm Counterbalance......................................................... 48
Remove covers..................................................................... 49
Rotational Tension Adjustment ................................................. 49
12 O’Clock Delivery Systems (541 and 545)............................ 50
Product Overview (541 and 545) ......................................... 51
A-dec 541 12 O’Clock Duo Delivery System ................................... 51
A-dec 541 Internal Components .....................................................51
Flex-Holder......................................................................... 52
Control Center Covers............................................................ 52
Doctor’s Holder.................................................................... 53
A-dec 500 Delivery Systems Common Features ........................57
Product Overview (All Delivery Systems)................................58
A-dec Tubing ...........................................................................58
Quick Connect Fittings ...............................................................58
Connect Tubing ........................................................................58
Disconnect Tubing .....................................................................58
Data Communication System ....................................................59
Circuit Board Components .......................................................60
Brake Handle.......................................................................61
Accessory Holder ..................................................................61
Master On/Off Toggle .............................................................62
Flush Toggle ........................................................................62
Traditional Tray Holder .............................................. ........ .....63
Foot Control........................................................................63
Self-Contained Water Bottle.....................................................64
Standard Syringe...................................................................65
Warm Water Syringe...............................................................65
Syringe Temperature Selection Input ...............................................65
Warm Water Syringe Specifications ................................................. 66
Tooth Dryer.........................................................................67
Service, Usage, and Adjustments (Common Features) ...............68
Control Block...................... ....... ....... ........ ....... ....... ........ .....68
Air Coolant .............................................................................68
Water Coolant ..........................................................................69
Drive Air ................................................................................69
Remove the Control Block........................................................70
532/533/542 Delivery Systems ......................................................70
541 Delivery System ...................................................................70
Tray Holder .........................................................................71
Adjust Tray Holder Tension ..........................................................71
Level Delivery System Tray ..........................................................71
Intraoral Light Source Voltage...................................................72
Intraoral Light Source Length and Voltage ........................................72
Service, Usage, and Adjustments (541 and 545) ...................... 54
Level the Arm Assembly and Worksurface..................................... 5 4
Level the Arm Assembly Front To Back ............................................54
Level the Arm Assembly Side To Side ..............................................54
Level Round Worksurface ............................................................55
Worksurface Height............................................................... 55
Instrumentation Arm Positioning................................................ 56
Position Holders .......................................................................56
5 ASSISTANT’S INSTRUMENTATION (551 AND 545) ............. 73
Product Overview (551).....................................................74
Holders..............................................................................75
Standard Holder .......................................................................75
Electric Holder .........................................................................76
Assistant’s Touchpad ..............................................................77
Solids Collector ......................................... ....... ....... ........ .....78
Tip-Up Feature .................................................................... 78
Adjustments (551) ........................................................... 79
Left or Right Conversion ......................................................... 79
Product Overview (545) .................................................... 80
Solids Collector.................................................................... 81
Remove Solids Collector and Replace Screen .....................................81
Leveling (545)....................................................... ........ ....... 82
Arm Assembly...................................................................... 82
Front-To-Back .......................................................................... 82
Side To Side ............................................................................82
Worksurface........................................................................ 83
Level Round Worksurface ............................................................83
Adjustments (545) ........................................................... 84
Worksurface Height............................................................... 84
Worksurface and Instrumentation Arm Height ....................................84
Instrumentation Arm Positioning................................................ 85
Assistant’s Arm ........................................................................85
Bump-Up Feature ......................................................................94
Adjustments/Maintenance ..................................................95
Leveling.......................................... ...................................95
Support Link and Lower Support Arm Leveling ...............................96
9 CLINICAL PRODUCTS ............................................... 97
EA-50LT and EA-51LT Electric Micromotor.....................................98
O-ring Replacement...............................................................98
Micromotor Tubing Terminal O-ring Replacement ................................98
Micromotor O-ring Replacement ....................................................98
Bushing Replacement .............................................................98
Micromotor Tubing Insert Bushing Replacement ..................................98
EA-50LT Bulb Replacement.......................................................99
Replace Bulb ...........................................................................99
EA-51LT Bulb Replacement ..... ....... ....... ........ ....... ....... ........ ... 100
Remove Bulb ......................................................................... 100
Replace Bulb ......................................................................... 100
6 CUSPIDOR ............................................................ 87
Product Overview............................................................ 88
Cuspidor Circuit Board Components............................................ 88
Service, Usage, and Adjustments ......................................... 89
Cupfill Functions .................................................................. 89
Bowl Rinse Functions ............................................................. 89
Cupfill and Bowl Rinse Timing................................................... 89
7 FLOOR BOX .......................................................... 91
Product Overview............................................................ 91
Air and Water Manual Shutoff Valves........................................... 91
Gauge and Pre-Regulator......................................................... 91
Service, Usage, and Adjustments ......................................... 92
Filter Element .................................................................... 92
8 SUPPORT SIDE FEATURES ......................................... 93
Product Overview............................................................ 94
Components........................................................................ 94
Limit Switch Operation........................................................... 94
10 ICV ................................................................. 101
Product Overview (ICV) ................................................... 102
Vacuum Requirements .......................................................... 102
ICV Display Pane................................................................. 103
Service, Usage, and Adjustments (ICV) ................................ 104
ICV Control Circuit Board....................................................... 104
ICV Display Circuit Board....................................................... 105
Adjustments...................................................................... 106
Cycle Time Test.................................................................. 106
Cycle Time Adjustment......................................................... 106
11 TROUBLESHOOTING............................................. 107
Dental Chair ................................................................. 108
Delivery Systems ........................................................... 114
Circuit Board Troubleshooting and LED Diagnostics ................. 122
Circuit Board Replacement..................................................... 122
Circuit Board Troubleshooting ..................................................... 122
Touchpad Diagnostics ...................................................... 123
500 Deluxe Touchpad Help Messages................................... 126
86.0348.00 Rev A Table of Contents iii
A-dec 500 and Clinical Products Service Guide Table of Contents iv
Cuspidor ..................................................................... 139
Floor Box .................................................................... 145
Clinical Products ........................................................... 146
Warm Water Syringes ...........................................................146
Tooth Dryer........................................................................148
A-dec Intraoral Camera .........................................................149
Sopro Intraoral Cameras (717 and 595).......................................150
SP Newtron........................................................................152
MiniLED ............................................................................154
EA-50/51LT Electric Micromotor ...............................................155
ICV ............................................................................ 156
INTRODUCTION
1
Inside This Guide
This guide is intended for newly trained and seasoned service technicians
responsible for installing and maintaining A-dec products. The technician
should understand dental equipment operation, how to use flow diagrams,
and how to perform basic maintenance on dental or medical equipment.
Inside this guide you will find the tools, maintenance, adjustments, and
troubleshooting information for A-dec 500 products.
Document Conventions
NOTE Notes indicate additional information, and when it is
important that instructions are followed.
CAUTION Caution indicates when failure to follow instructions could
result in damage to product or minor injury.
TIP Tips indicate tips or tricks to make installation, use, or
maintenance easier.
IMPORTANT Important indicates areas in which to refer to or use
specific instructions.
BIOHAZARD Biohazard indicates potential infection if instructions are
not properly followed.
DANGER Danger indicates warnings of dangerous voltage and of
certain electrical shock.
WARNING Warning indicates potential severe injury or death if
instructions are not followed properly.
86.0348.00 Rev A 1
A-dec 500 and Clinical Products Service Guide Introduction 2
Get Support
Customer Service
For questions not addressed in this document, contact A-dec Customer Service
using contact information for your region.
U.S. and Canada
A-dec Inc.
2601 Crestview Drive
Newberg, OR 97132 USA
Tel: 1.800.547.1883 within US and Canada
Tel: 1.503.538.7478 outside US and Canada
www.a-dec.com
www.a-dec.biz
United Kingdom
A-dec United Kingdom
Austin House, 11 Liberty Way
Nuneaton, Warwickshire CV11 6RZ
England
Tel: 0800 ADECUK (233285) within UK
Tel: 44 24 7635 0901 outside UK
www.a-dec.co.uk
Australia
Other Sources of Information
Genuine A-dec Parts Catalog
The Genuine A-dec Service Parts Catalog (p/n 85.5000.00), provides part number
and ordering information for A-dec serviceable parts. This catalog details
service parts for current products and products which are no longer
manufactured, but still supported. Refer to this catalog for additional details on
parts found in the service guide addendum.
A-dec Dental Furniture Technical Packet
The A-dec Dental Furniture Technical Packet, P/N 86.0142.00, contains
information specifically related to dental furniture. The content is intended to
assist you in specifying plumbing, utilities, framing and construction
requirements for installation of dental furniture.
A-dec Illustrated Parts Breakdown
The A-dec Illustrated Parts Breakdown (IPB), P/N 85.0851.00, contains illustrated,
exploded views of assemblies with part numbers and descriptions for
associated parts for products produced before A-dec 500.
Electronic Documentation
Electronic versions (PDF files) of our documentation (installation instructions,
service guides, technical information) can be viewed or downloaded from the
A-dec website (www.a-dec.com). Check this location for current detail on
products and technical information.
A-dec Australia
Unit 8, 5-9 Ricketty St.
Mascot, NSW 2020
Australia
Tel: (02) 8332 4000
1.800.225.010
www.a-dec.com.au
Web Contact
Partner Resources websites: www.a-dec.biz
Serial, Model Numbers, Color Identification
Light Location
Chair (Under
Toeboard)
Cuspidor (Inside
Support Center)
Power supply
(inside motor pump area)
Assistant’s
Instrumentation Location
Delivery System
Location
Monitor Mount
Location
Products Manufactured
before June 2011
Serial
Number
Model
Number
Products Manufactured
June 2011 and after
511
11F28293
DENTAL
CHAIR
Serial and Model Numbers
Product serial and model number information can be found on the serial/
model number labels. When contacting customer service, the serial number
helps identify the product and when it was manufactured.
The first letter of the serial number indicates the month the product was
manufactured. For products manufactured before June 2011, the first digit of
the serial number indicates the year of manufacture (for example, L0 =
December 2010). For products manufactured June 2011 and after, the first two
digits indicate the year of manufacture (for example, 11F = June 2011).
Use Table 1 and Figure 2 to reference how to identify serial/model number
information.
Figure 1. Serial/Model Number Locations on A-dec 500
Tab l e 1 . M ont h Ide n tif i c at i o n Tab l e
Letter Month Letter Month
A January G July
B February H August
C March I September
DApril JOctober
EMay KNovember
F June L December
Figure 2. Serial Number Label Examples
86.0348.00 Rev A Introduction 3
A-dec 500 and Clinical Products Service Guide Introduction 4
Service Tools
Table 3 lists the types of tools available from A-dec for servicing A-dec equipment and their recommended use:
Figure 3. Recommended Tools
Tool Tas k Part Illustration Part Number
Drive air pressure gauge Adjusting handpiece drive air pressure, 0-60 psi (4 .13 b ar). This
gauge does not fit the Borden 3-hole coupler
Hemostat Troubleshooting or repairing a unit to stop air or water flow
through tubing
Hex wrench or key set Servicing or installing A-dec equipment (plastic case included) 009.018.00
®
Loctite
O-ring tools Replacing O-rings during quick field repairs (fits the four
Installing threaded fasteners to prevent loosening 060.001.00 (Red 271)
smallest O-ring sizes)
50.0271.00
009.008.00
060.002.00 (Blue 242)
009.013.00
Panel mount gauge Checking air/water pressure
Can also be used as an inline pressure gauge for testing
purposes
026.118.00
Tool Tas k Part Illustration Part Number
Silicone lubricant Lubrication of internal moving parts such as O-rings, oral
evacuator valves, and bushings
Sleeve tool Aid in securing 1/4" tubing sleeves and 1/8" uni-clamps 98.0072.00
98.0090.01
Snap ring tool Installation and removal of internal and external snap rings (fits
all snap rings used in A-dec equipment)
Tubing stripper Separation of the extruded air and water lines in vinyl tubing 009.035.00
Umbilical stringer Route additional tubing or wiring through existing umbilical
assemblies (12’ [3.66 mm] stringer with threading holes on both
ends)
Valve test syringe Quick tests of pilot operated valves; used to apply a static
pressure of 5-75 psi (.34-5.17 bar, package of 4)
009.007.00
009.015.00
98.0050.01
86.0348.00 Rev A Introduction 5
A-dec 500 and Clinical Products Service Guide Introduction 6
DENTAL CHAIR
2
This section provides information related to servicing, maintenance, and
adjustments of the A-dec 511 chair. For information on service parts, see the
Genuine A-dec Service Parts Catalog (p/n 85.5000.00) or contact A-dec customer
service.
Contents
• Product Overview, page 8
• Service, Usage, and Adjustments, page 10
Figure 4. A-dec 511 Dental Chair
86.0348.00 Rev A 7
A-dec 500 and Clinical Products Service Guide Dental Chair 8
Hydraulic Motor
Pump Assembly
Baseplate
Armrest
Seat
Headrest
Foot Switch
Back
On/Off Button
Product Overview
A-dec 511 Chair
The A-dec 511 chair provides a range of movements to position the patient for
dental treatment. The chair offers seat and back support, adjustable head
support, and movable arm support, and a footswitch and/or touchpad(s)
control the chair movement.
Figure 5. A-dec 511 Chair Features
A-dec 511 Chair Specifications
Load Capacity
Patient Load: 400 lb. (181 kg) maximum
Accessory Load: 250 lb. (113 kg) maximum
Specifications are subject to change without notice.
NOTE Ensure the chair is bolted to the floor after installation.
Power On/Off Button
The power on/off button is located on the base of the chair, and is the main
disconnect that completely shuts down the electrical systems. When the button
is pressed in, power is on. When the button is out, power is off.
Figure 6. On/Off Button
Limp-Along Feature
If there is a problem or malfunction, the limp-along feature allows the operator
to move the chair in the up direction for one second intervals by pushing the
manual control buttons on the touchpad or footswitch.
Chair Power Supply
CB 4 Assistant’s
Arm, Control
Head, Chair
Circuit Board.
CB 3 - Support side arm
CB 1 and CB2 - Mains
CB 5 - Dental Light
The 300-watt power supply comes standard with the A-dec 511 chair. It is
located in the motor pump area of the chair. The total available auxiliary load is
a maximum of 4 Amps.
NOTE The electric switch connects the power supply to pilot air.
Figure 7. Chair Power Supply Circuit Breaker Identification
86.0348.00 Rev A Dental Chair 9
A-dec 500 and Clinical Products Service Guide Dental Chair 10
Stop Plate
Cover
Lift Arm
Cover
Motor Pump Cover
Motor Pump Cover Plug
Service, Usage, and Adjustments
Chair Covers
The A-dec 511 chair motor pump, lift arm and stop plate covers are removed in
the following order:
1. Motor Pump Cover
○ To remove: Remove screw from each side and lift up.
○ To replace: Replace cover, and attach with two screws.
2. Lift Arm Cover
○ To remove: 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 snap into
place. Ensure both sides are firmly attached.
3. Stop Plate
○ To remove: 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.
Figure 8. A-dec 511 Chair Covers
Factory Default Routine
When a new circuit board is installed in the chair, the circuit board needs to run
the factory default routine to learn the range of motion of the chair. The
routine:
• sets the base and back upper limits
• calculates new presets based on actual range of motion of the chair
• verifies that the potentiometers work
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.
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 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.
86.0348.00 Rev A Dental Chair 11
A-dec 500 and Clinical Products Service Guide Dental Chair 12
Chair Circuit Board Components
Part No: 90.1072.00
Item Description
1 P7, P8, P9 - Data line ports
2 DS4 - Stop switch LED (limit switch) and P10 connector
3DS5 - Back potentiometer LED and P1 connector
4 DS6 - Base potentiometer LED and P2 connector
5 P5 - Footswitch connector
6P3 - Test points
7DS12 - Base down LED and relay K5
8 DS11 - Base up LED and relay K4
9 DS10 - Back down LED and relay K3
10 DS9 - Back up LED and relay K2
11 DS1 - AC power LED
12 DS2 - Stat us LED
13 DS3 - Data LED
14 DS13 - Chair lockout LED and terminal strip J1
15 J2 - Ø VAC terminal strip (output)
16 J2 - 24VAC terminal strip (outp ut)
17 P4 - Input power and dental light connector
18 J3 - Vacuum relay K7 and output terminal strip
19 P11 - Pump motor and solenoid connector
20 DS8 - Dental light LED and relay K1
21 DS7 - Dental light LED and relay K6
Figure 9. A-dec 511 Chair Circuit Board Components
1
11
12
13
14
4
3
5
67
8
9
10
21
18
16
15
17
20
2
19
86.0348.00 Rev A Dental Chair 13
A-dec 500 and Clinical Products Service Guide Dental Chair 14
LED Identification
This table describes the LEDs on the chair circuit board.
Figure 10. LED Identification Table
LED Status Description
DS1 - AC power LED Off No 24 VAC power, tripped circuit breaker, power supply turned off, no line voltage
Green, steady 24VAC at the terminal strip
DS2 - Status LED Off System is not functioning, no power or circuit board has failed
Green, steady Normal operation
DS3 - Data LED Off No DCS communication, not connected to the DCS, or DCS has failed
Green, steady Detects active DCS
Green, blinking Valid DCS Message
DS4 - Chair limit switch Off Closed, (normal)
Red Open, (activated)
DS13 - Chair lockout Off Open, (normal)
Red Closed, (activated)
DS5 + DS6 - Chair potentiometers Off Potentiometer:
• Not connected or bad connection
• Moving in wrong direction
• Limited range of mot io n, or
•Cable is not on wheel
Yellow, steady Normal operation
Yellow, fast blink Upper end of travel
DS9, DS10, DS11, DS12 - Chair relay LEDs Off Relay is off
On Relay is on
DS7, DS8 - Dental light relay LEDs Off Relay is off
On Relay is on
DS14 - Vacuum relay LED Off Relay is off
On Relay is on
The Hydraulic System
Max Level
Min Level
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
• Motor-driven hydraulic pump with solenoids
Hydraulic Fluid Reservoir
The hydraulic fluid reservoir is located in the lift arm of the chair under the
stop plate cover. You can see the fluid level in the reservoir through the sides of
the reservoir. A top fill cap allows you to add fluid. The hydraulic system holds
40 ounces (2.5 pints [1.18 l]) of hydraulic fluid. To fill the reservoir:
1. Place the chair in the full base and back up position.
2. Fill to the green Max line. See Figure 11.
CAUTION Do not overfill.
3. Cycle the chair after the reservoir is filled.
Figure 11. Hydraulic Fluid Reservoir
86.0348.00 Rev A Dental Chair 15
A-dec 500 and Clinical Products Service Guide Dental Chair 16
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.
The chair seat travels vertically from a low point of 13.5" (343 mm) to a high
point of 31.5" (800 mm) above the floor. See Figure 12.
Motor Driven Hydraulic Pump
The hydraulic pump takes hydraulic fluid from the reservoir and pressurizes it
to extend the chair lift and tilt hydraulic cylinders for back and base up
functions. The bi-directional pump rotates one direction for Base Up and the
opposite direction for Back Up.
The solenoids mounted to the pump assembly gate hydraulic fluid from the
two cylinders. Depending on the chair Down function, the controller selects
which solenoid-actuated manifold valves are open or closed. The 100-120 VAC
pump and 220-240 VAC pump are equipped with an automatic reset 110°C
(230°F) thermal limiter. There are no serviceable parts on the hydraulic pump
other than the solenoids.
NOTE You cannot adjust the speed of the chair.
Figure 12. Hydraulic Cylinder Operation
Capacitor
Capacitor
Part Number: 041.642.00, 100 VAC, 041.643.00, 110 - 120 VAC, 041.644.00, 220 - 240 VAC
The capacitor is energized during chair Base Up or Back Up functions.
Figure 13. A-dec 511 Chair Capacitor
86.0348.00 Rev A Dental Chair 17
A-dec 500 and Clinical Products Service Guide Dental Chair 18
Solenoids
Part No: 90.1070.00, 110 - 120 VAC, 90.1071.00, 220 - 240 VAC
Figure 14. A-dec 511 Chair Solenoids
Test Solenoids
A solenoid is entergized during Base Down and Back Down functions. To
check for a failed solenoid, test the solenoids using a volt/ohm meter or
Back Down Solenoid
magnetic pull test:
Base Down Solenoid
Magnetic Pull
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 entergized.
Coil Resistance
Disconnect the solenoid power at the 2-position connector. Place on Ohm meter
probe on each solenoid connector terminals.
• 100 - 120 VAC = 177 Ohms ± 18 Ohms
• 220 - 240 VAC = 845 Ohms ± 85 Ohms
NOTE If the solenoid is hot, then the resistance reads higher.
NOTE When replacing a solenoid, wipe up any oil, and replace
existing O-rings on the solenoid base.
WARNING The solenoid coils are powered by line voltage (100, 120, or
240 VAC). Failure to unplug the chair may result in serious injury
from electrical shock.
WARNING You must depressurize the base or back system prior to
removing the solenoid.
Motor Pump
Assembly
1. Depressurize base or back system.
2. Remove the failed solenoid coil.
3. Replace with the operating solenoid coil.
4. Lower the chair base and back.
Potentiometer
Base Up Potentiomete
Back Up Potentiometer
The potentiometer and cable assembly is a simple, accurate unit, which eliminates position float. “Float” is a slight change or variation in the pre-programmed
positions. The chair uses the same potentiometer assembly for both lift and tilt requirements. If a potentiometer should fail, 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.
Figure 15. Location of Chair Base Up and Back Up Potentiometers
86.0348.00 Rev A Dental Chair 19
A-dec 500 and Clinical Products Service Guide Dental Chair 20
Stop Switch
Assembly
Chair Stop Plate
The chair stop switch stops chair movement when you press the stop plate.
Should anything inadvertently become lodged under the chair, press Base Up
on the touchpad or footswitch to raise the chair so you can remove the object.
As long as you apply pressure to the stop plate, the chair does not move down.
The stop plate has only one switch. The switch and all other parts snap into
place for easy removal or replacement. No tools are required.
WARNING Be sure to power off the chair and disconnect it from its
power source before replacing the stop switch.
CAUTION Cable tie the wires to the lift arm to prevent kinking and
pinching.
Chair Bump-Up Feature
The chair stop plate and the assistant’s arm trigger the chair to move upwards
if it was moving down when the stop plate switch was activated.
Figure 16. A-dec 511 Chair Stop Plate
Swivel Brake Adjustment
The chair can rotate to any position within 30° either side of center. The chair
swivel brake keeps the chair from moving. To engage the brake, push the brake
lever firmly to the left. To release the swivel brake, push the brake lever to the
right.
Figure 17. Chair Swivel
Figure 18. Swivel Brake Tension Adjustment
Tension Adjustment
If the chair swivels left or right with the brake engaged or if it is difficult to
move with the brake disengaged, adjust the swivel brake tension. To adjust the
tension, use a 5/32 hex key and turn the tension adjustment screw;
• Clockwise to increase brake friction.
• Counterclockwise to decrease brake friction.
If you cannot obtain proper adjustment through rotation of the hex key, replace
the brass brake pad by removing the brake handle and using a hex key to
disengage the pad. Remove the old pad and replace with new one. Replace the
brake handle and handle retainer.
NOTE To disable the swivel feature, reinstall the shipping pin.
Tension
Adjustment Screw
Engaged
86.0348.00 Rev A Dental Chair 21
Released
A-dec 500 and Clinical Products Service Guide Dental Chair 22
Glide Bar
Headrest Adjustment Lever
Glide Bar Tension Adjustment
Headrest Adjustment
The headrest adjustment lever allows you to use one hand to adjust the
headrest. When the lever is released, the headrest holds its position.
If the headrest drifts downward, or if it is difficult to move up or down, adjust
the glide bar tension. To adjust the tension, use a 1/8 hex key and turn the
tension adjustment screw clockwise to increase friction or counterclockwise to
decrease friction.
Figure 19. Headrest Adjustments
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