A-Dec Dental Lights and Monitor Mounts Service guide

Service Guide

A-dec Dental Lights and Monitor Mounts

A-dec Dental Lights and Monitor Mounts

b

Copyright

© 2014 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 United States and other countries. A-dec

400, 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 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.

Regulatory Information

Regulatory information mandated by agency requirements is provided in the

Regulatory Information, Specifications, and Warranty document (p/n 86.0221.00), which is available in the Document Library at www.a dec.com. This document includes:

•Serial number identification

•Software revisions

•Warranty statement

•Deluxe touchpad help messages

•Intended application and use statements

•Identification of symbols

•Environmental specifications

•Classification of equipment

•Electrical rating and electromagnetic information

•Chair load capacity

Product Service

Product service is available through your local authorized A-dec dealer. For service information, or to locate an authorized dealer, contact A-dec at 1.800.547.1883 in the USA and Canada or 1.503.538.7478 worldwide, or visit www.a-dec.com.

A-dec Dental Lights and Monitor Mounts

Service Guide

A-dec Dental Lights and Monitor Mounts

Contents    2

Contents

Overview...........................................................	4
Customer Service................................................................	4
U.S. and Canada.....................................................................	4
United Kingdom......................................................................	4
Australia..............................................................................	4
Web Contact..........................................................................	4
Other Sources of Information..................................................	4
Dental Lights and Monitor Mounts Service Reference.......................	4
Other A-dec Service Documents................................................	4
A-dec Dental Lights..............................................	5
Dental Light Specifications.....................................................	6
Dental Light Mounting Locations..............................................	7
Dental Light Circuit Breaker Locations.......................................	8
Dental Light Operations........................................................	9
Dental Light Touchpad Controls...................................................	9
Power and Intensity Settings......................................................	10
A-dec LED Dental Light Manual On/Off and Intensity .....................	10
A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis)
Manual On/Off and Intensity...................................................	10
A-dec 371/372 Dental Light (Halogen 2-Axis) Manual On/Off
and Intensity......................................................................	10
Halogen Dental Light Intensity Switch Voltage Measurements............	11
Auto On/Off Function...........................................................	11
Dental Light Bulb Replacement..................................................	12
A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis)....................	12
A-dec 371/372 Dental Light (Halogen 2-Axis)...............................	13
Dental Light Shield Cleaning......................................................	14
Halogen Dental Light Shield....................................................	14
LED Dental Light Shield ........................................................	14
Dental Light Adjustments....................................................	15
A-dec LED Dental Light Rotation Adjustments.................................	15
LED Light Range of Motion Adjustments......................................	15
LED Light Forward Tilt Adjustment............................................	15
LED Light Horizontal and Diagonal Rotation Adjustment..................	15

A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis) Rotation
Adjustments.........................................................................	16
571/572/6300 Light Head Rotation............................................	16
571/572/6300 Horizontal Rotation............................................	16
571/572/6300 Diagonal Axis Rotation.........................................	17
571/572/6300 Vertical Rotation...............................................	17
571/572/6300 Focus.............................................................	17
A-dec 371/372 Dental Light (Halogen 2-Axis) Rotation Adjustments.......	18
371/372 Horizontal Rotation...................................................	18
371/372 Vertical Rotation......................................................	18
Dental Light Flexarm Counterbalance Adjustment............................	18
Dental Light Wiring and Power Connections...............................	19
A-dec LED Dental Light Circuit Board Components............................	20
LED Driver Circuit Board Identification.......................................	20
LED Dental Light Circuit Board Indicators....................................	20
LED Array Board Indictors.......................................................	21
LED Dental Light Indicator Light Circuit Board Identification.............	22
LED Indicator Light Board Indictors...........................................	22
LED Dental Light Terminal to CAN Adapter Board Identification..........	23
CAN Adaptor Board ..............................................................	23
A-dec LED Dental Light (570L — 577L) Wiring..................................	24
571L on an A-dec 511 Chair.....................................................	24
571L on an A-dec 411 Chair.....................................................	25
571L on an A-dec 311 Chair.....................................................	26
572L on an A-dec 511 Chair, Radius Arm Mounted..........................	27
574L Cabinet Mounted...........................................................	28
575L Wall Mounted...............................................................	29
576L Ceiling Mounted............................................................	30
577L Track Mounted..............................................................	31
A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis) Circuit
Board Components.................................................................	32
571/572/6300 Dental Light Output Functions...............................	32
511 Chair Circuit Board Indicators ............................................	33
511 Chair Circuit Board Identification........................................	33
A-dec 6300 Dental Light Relay Circuit Board...................................	34
6300 Dental Light Output Functions..........................................	34
6300 Dental Light Relay Circuit Board LED Indicators......................	35

6300 Dental Light Relay Circuit Board Identification.......................	35
A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis) Wiring..............	36
6300 Ceiling, Wall, and Preference Mount Switch and Data
Line Connections.................................................................	36
6300 Track Light Switch Connections and Data Line
(2004 and Later).................................................................	37
6300 Track Light Switch Connections and Data Line
(2003 and Earlier)................................................................	38
A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis) Transformer ......	40
100 VAC Transformer Wiring....................................................	40
110-120 VAC Transformer Wiring...............................................	40
220-240 VAC Transformer Wiring...............................................	41
A-dec 371/372 Dental Light (Halogen 2-Axis) Circuit
Board Components .................................................................	42
A-dec 311/411 Dental Chair Circuit Board for 371/372 Dental
Light on an A-dec 311 and 411 Chair..........................................	42
311/411 Chair Circuit Board LED Indicators.................................	43
311/411 Chair Circuit Board Identification...................................	43
A-dec 511 Chair Board Components for 371/372 Dental Light
on an A-dec 511 Chair...........................................................	44
371/372 Dental Light Output Functions......................................	44
511 Chair Circuit Board LED Indicators.......................................	45
511 Chair Circuit Board Identification........................................	45
A-dec 371/372 Dental Light Relay Circuit Board............................	46
371/372 Dental Output Functions.............................................	46
371/372 Dental Light Relay Board LED Indicators...........................	47
371/372 Dental Light Relay Circuit Board Identification...................	47
371/372 and 571L/572L Wiring on the 311 and 411 Chair Board............	48
A-dec 371/372 Dental Light (Halogen 2-Axis) Wiring.........................	49
371/372 Dental Light Connections............................................	49
On/Off Switch....................................................................	49
A-dec 371/372 Dental Light Wire Connections on an
A-dec 311 Chair..................................................................	50
A-dec 371/372 Dental Light Wire Connections on an
A-dec 511 Chair..................................................................	51
A-dec 371/372 Dental LIght Wire Connections on Cascade, Decade,
Performer, Priority Chairs.......................................................	52
Dental Light Troubleshooting................................................	54

A-dec Monitor Mounts..........................................	57
Monitor Mount Specifications and Adjustments...........................	58
Monitor Mount Specifications.....................................................	58
Monitor Mount Adjustments.......................................................	58
Tray Holder Tension Adjustment (581)..........................................	60
Panning Friction Adjustment (587)...............................................	60

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A-dec Dental Lights and Monitor Mounts

Overview    4

Overview

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: [phone] within US and Canada Tel: [phone] 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: [phone] outside UK

www.a-dec.co.uk

Other Sources of Information

Dental Lights and Monitor Mounts Service Reference

This document is a companion to the A-dec Dental Lights and Monitor Mounts Service Reference (p/n 86.0328.00). The Service Reference contains flow diagrams and illustrated parts breakdown for lights and monitor mounts. Circuit board component information is available in both this document and the Service Reference.

Other A-dec Service Documents

The A-dec 311, 411, and 511 Dental Chairs Service Guide (p/n 86.0380.00) contains service, maintenance, and troubleshooting content. The A-dec 311, 411, and 511 Dental Chairs Service Reference (p/n 86.0381.00) contains illustrated parts breakdown content. Circuit board components and flow diagrams are in both documents. These documents include cuspidors, floor boxes, and support centers.

The A-dec 300, 400, and 500 Delivery Systems Service Guide (p/n 86.0382.00) contains service, maintenance, and troubleshooting content. The A-dec 300, 400, and 500 Delivery Systems Service Reference (p/n 86.0383.00) contains illustrated parts breakdown content. Circuit board components and flow diagrams are in both documents. These documents include cuspidors, floor boxes, and support centers.

Australia

A-dec Australia

Unit 8, 5-9 Ricketty St. Mascot, NSW 2020 Australia

Tel: [phone].225.010 www.a-dec.com.au

Web Contact

Partner Resources websites: www.a-dec.biz.

A-dec Dental Lights

This section provides service, usage, adjustments, and maintenance content for A-dec dental lights.

A-dec LED Dental Light (570L — 577L)

A-dec 371/372 Dental Light (Halogen 2-Axis)

A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis)

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Dental Light Specifications

NOTE  Specifications are subject to change without notice. Some requirements may vary from country to country. For more information, contact your authorized A-dec dealer.

A-dec LED Dental Light (570L - 577L)	A-dec 571/572 and 6300 Dental Light	A-dec 371/372 Dental Light
	(Halogen 3-Axis)	(Halogen 2-Axis)

Focal Range	16” - 30” (400 mm - 750 mm)	18” - 31” (457 - 787 mm)	18” - 31” (457 - 787 mm)
Bulb	n/a	Quartz Xenon Halogen, single-end prongs	Quartz Xenon Halogen, single-end prongs
Bulb Rating	LED: White HBLED, 88-92 CRI	17 V / 95 W	17 V / 95 W
Color temperature	White 5,000 Kelvin	5,000 Kelvin	5,000 Kelvin
Light pattern	5.7” x 3.8” at 27.6” (145 mm x 95 mm at 700 mm)	3.3” x 6.3” at 27.6” (84 mm x 160 mm at 701 mm)	3.3” x 6.3” at 27.6” (84 mm x 160 mm at 701 mm)
Nominal Light Intensity	** Cure-safe Mode: 25,000 lux (2323 fc)	High: 24,000 lux (2230 fc)	High: 24,000 lux (2230 fc)
	High: 30,000 lux (2787 fc)	Medium: 20,000 lux (1858 fc)	Medium: 20,000 lux (1858 fc)
	Medium: 25,000 lux (2323 fc)	Low: 8,000 lux (743 fc)	Composite: 8,000 lux (743 fc)
	Low: 15,000 lux (1394 fc)
Heat Output	24	325	325
(BTU per Hour)

*For electrical specifications, identification of symbols, and other regulatory requirements, refer to the Regulatory Information, Specifications, and Warranty Instructions for Use (p/n 86.0221.00).

**The LED cure-safe mode provides effective illumination while preventing the premature curing of photo-initiated composites, sealants, and adhesives. This mode uses a medium intensity light setting and a non-reactive wavelength of light.

Dental Light Mounting Locations

Cabinet-Mounted	Ceiling-Mounted	Track-Mounted	Wall-Mounted
(LED and 6300)	(LED and 6300)	(LED and 6300)	(LED and 6300)

Radius Style (LED, 371/372, 571/572, 6300)	LED, 371/372, 571/572 Dental Light on	LED, 371/372, 571/572 Dental Light on
Dental Light on A-dec 500 Chair Support Mount	A-dec 300 Chair and 2” Post Mount Support Mount	A-dec 500 Chair Support Side Mount

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Dental Light Circuit Breaker Locations

A circuit breaker will interrupt the flow of electricity under abnormal conditions. If the circuit breaker should trip, inspect the wiring to ensure there are no

shorts, and reset by pushing the circuit breaker. If the circuit breaker for the dental light is located on the power supply, its location varies by chair. For non-chair based lights, the operatory circuit breaker is used.

Chair Model/	Circuit Breaker Location
Location
A-dec 311/411
Under Motor
Pump Cover

A-dec 511

Under Motor

Pump Cover

Cascade,® Decade,® Performer,® A-dec 200, early model A-dec chairs

Under the Utility Floor

Box Cover

Before

June 2012

10
A
M
P	10
	A
	M
	P

Effective June 2012

10 A M P

10 A M P

10

A

M

P

10 A

Mounting Location	Circuit Breaker Location
Track Mount
Cabinet Mount

Post Mount: Cascade,® Decade,® Performer,® early model A-dec chairs

Ceiling Mount

Wall Mount

Dental Light Operations

Dental Light Touchpad Controls

Dental light can be operated from the touchpad on the A-dec 200, 300 and 500 systems. Press the light button on the touchpad to turn on the light, and press and hold the light button to turn the light off.

Standard Touchpad	Deluxe Touchpads
	Dental Light Button	Dental Light
		Indicator
	Dental Light
	Indicator

Dental Light

Button

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Power and Intensity Settings

A-dec LED Dental Light Manual On/Off and Intensity

The mode button is used to select the intensity level. The illuminated indicator shows the selected mode. The dental light retains the selected mode unless the entire system is turned off, which resets the light to medium intensity.

Mode Indicator	Mode Button
Panel

Cure-Safe

High

Medium

Low

Power Button

A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis) Manual On/Off and Intensity

The on/off switch is used to activate the light. The intensity switch toggles between this light’s three intensity settings (composite, high, and medium). The dental light button on the touchpad works as a three-way switch with the on/off switch on the light.

Intensity

Switch

On/Off Switch

A-dec 371/372 Dental Light (Halogen 2-Axis) Manual On/Off and Intensity

The on/off switch is used to activate the light and to toggle between intensities. With a touchpad, press the dental light button to activate the light and to toggle between intensity settings.

(Older models do not have on/off switch)

NOTE  For the A-dec 371/372 Dental Light, medium and composite intensity settings are available if preferred over high and composite. Contact A-dec Customer Service for instructions.

Halogen Dental Light Intensity Switch Voltage Measurements

The following are the voltage measurements for Halogen lights. If the switch needs to be replaced, the replacement kit is p/n 90.1039.00.

Position	Voltage	Wire
Open	5 VDC	White
Closed	0 VDC	White

NOTE  All DC voltage measurements are taken with the black multimeter lead on the black/white wire.

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.

Auto On/Off Function

All of the dental lights turn on when the chair back reaches a preset operating position. When the chair back moves out of the operating position, the light automatically turns off.

•To turn off the auto on/off feature, press and hold the program and dental light buttons for three seconds at the same time. One beep confirms the feature is off.

•To turn on the auto on/off feature, press and hold the program and dental light buttons for three seconds at the same time. Three beeps confirm the feature is on.

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A-dec Dental Lights and Monitor Mounts

Dental Light Bulb Replacement

A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis)

1.Turn off the light, and allow the light to cool.

2.Pull the plastic holder from the light yoke. Remove the bulb from the holder, but do not remove the outer wrapper.

Holder

Bulb

CAUTION  Do not remove the outer wrapper when handling the new bulb. Finger oils can affect light performance and severely limit bulb life. If you should inadvertently touch the bulb, gently clean it with cotton dampened with isopropyl or ethyl alcohol.

WARNING  To avoid burning your fingers, allow the light shield to cool before removing. Never operate the dental light with the light shield removed. The light shield contains UV blocking additives.

The light shield is also your protection in the unlikely event that the bulb shatters.

3.Release the toggles on the light shield and set the shield aside.

4.Use a gauze pad or cloth to protect fingers. Carefully pull the old bulb from its socket and discard.

A-dec Dental Lights    12

5.Hold the new bulb in its outer wrapper with the pins facing away, and carefully insert it in the socket. The bulb base is fragile and can break under excess pressure.

NOTE  Part of the pins are still visible when the bulb is fully inserted.

Outer Wrapper

New Bulb

6.Remove and discard the outer wrapper, reinstall the light shield, and secure with the toggles.

CAUTION  Do not attempt to install the light shield if it has a broken tab. Contact your authorized A-dec dealer for a replacement shield and install before operating the light.

7.Verify the operation of the light by turning it on and operating it at each intensity setting.

CAUTION  Use of a halogen bulb other than A-dec p/n 041.709.00 (Philips 14623, G 6.35, 17V, 95W) may result in damage to the bulb socket.

8. Reorder the bulb, p/n 041.709.00.

A-dec 371/372 Dental Light (Halogen 2-Axis)

A spare bulb is included with your dental light. Follow these steps when replacing the bulb.

WARNING  To avoid burning your fingers, allow the light shield to cool before removing. Never operate the dental light with the light shield removed. The light shield contains UV blocking additives.

The light shield is also your protection in the unlikely event that the bulb shatters.

1.Turn off the light and allow it to cool.

2.Gently pull out on the light shield tabs, then pull the edges of the shield toward you. Set the light shield aside.

Shield

Tab

Bulb Cap

Tab

3. Remove the bulb cap by rotating it counterclockwise. Set the bulb cap aside.

CAUTION  Take care when handling the bulb. The bulb base is fragile and can break under excessive pressure.

4.Using a gauze pad or cloth to protect your fingers, carefully pull the old bulb from its socket. Discard the bulb.

CAUTION  Do not remove the outer wrapper when handling the new bulb. Finger oils can affect light performance and severely limit bulb life. If you should inadvertently touch the bulb, gently clean it with cotton dampened with isopropyl or ethyl alcohol.

5.Holding the new bulb in its outer wrapper with the pins away from you, carefully insert the bulb pins into the socket. A small section of each pin is still visible when the bulb is fully seated.

Outer
Wrapper	New Bulb

6.Remove and discard the outer wrapper, then reinstall the bulb cap and light shield.

CAUTION  Do not attempt to install the light shield if it has a broken tab. Contact your authorized A-dec dealer for replacement shield and install before operating the light.

7.Verify the operation of the light by turning it on and operating it at each intensity setting.

8.Reorder the bulb, p/n 041.709.00.

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Dental Light Shield Cleaning

Halogen Dental Light Shield

1. Turn off the dental light.

WARNING  To avoid personal injury, be sure that the light has cooled before cleaning it.

3.Release the toggles on either side of the light to remove the light shield.

4.To clean the light shield use a small amount of non-abrasive liquid soap and warm water to wash it. Rinse and dry with a non-abrasive, lint free cloth.

If necessary, soak the pad or cloth with water or with a diluted solution of mild dish washing liquid before cleaning. Make certain no residue remains on the surface. Do not use abrasives or chlorine (such as household bleach) on the surface of the reflector. These can damage or discolor the reflector surface.

CAUTION  Do not rub heavily, clean the light shield when it is hot, or soak the shield assembly in cleaning solution. Doing so may damage the shield assembly components. Clean the light shield only as instructed.

CAUTION  Do not attempt to install the light shield if it has a broken tab. Contact your authorized A-dec dealer for a replacement shield and install before operating the light.

LED Dental Light Shield

A-dec recommends barriers to protect the dental light shield. In the event that the light shield needs to be cleaned, carefully clean the light shield in place using a soft cotton cloth with non-abrasive soap and water.

Do not remove the shield unless absolutely necessary. The shield is fitted with a gasket to keep dust and debris from entering the lens assembly. If liquid or dirt should bypass the gasket, the shield may be removed for cleaning.

CAUTION  Only remove the shield if absolutely necessary. Use a flat-blade tool that won’t damage the light housing. After removing the shield, do not touch or attempt to clean the multilens assembly or you may damage the components.

Reflector

Light Shield

Toggle

Dental Light Adjustments

A-dec LED Dental Light Rotation Adjustments

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.

LED Light Range of Motion Adjustments

The LED light offers three axes of rotation.

LED Light Forward Tilt Adjustment

To adjust the forward tilt motion of the light head, use a 7/64” hex key to turn the tension screw clockwise to increase tension or counterclockwise to decrease tension.

LED Light Horizontal and Diagonal Rotation Adjustment

To adjust the horizontal and diagonal tension, remove the indicator cover. 1. Use a 7/64” hex key to remove the three screws in the indicator cover.

2.To adjust the friction, turn the locking nut clockwise to increase the tension.

3.To adjust the diagonal tension, turn the screw clockwise to increase the tension.

Clockwise increases the tension.

Clockwise increases the tension.

4. Use the three screws to install the indicator cover.

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A-dec Dental Lights and Monitor Mounts

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A-dec 571/572 and 6300 Dental Light (Halogen 3-Axis) Rotation Adjustments

571/572/6300 Light Head Rotation

The light head needs adjusting if it is difficult to position, moves too easily, or drifts out of position.

Horizontal Rotation

571/572/6300 Horizontal Rotation

Use a hex key to make horizontal rotation adjustments, beginning with the top screw on both sides of the switch housing.

•Increase the tension by turning the screws clockwise.

•Loosen the tension by turning the screws counterclockwise.

Horizontal Rotation

Tension Screws

Diagonal Rotation

Vertical Rotation

571/572/6300 Diagonal Axis Rotation

Adjust the screw at the bottom of the switch housing.

•Increase the tension by turning the screw clockwise.

•Loosen the tension by turning the screw counterclockwise

•To eliminate all movement in the diagonal axis, tighten the adjustment screw until it is tight.

Diagonal Axis

Tension Screw

571/572/6300 Vertical Rotation

1.On one side of the light head, loosen the setscrew.

2.Remove the light yoke plug.

Light Yoke Plug

Setscrew

3.Use a large flat-blade screwdriver to turn the adjustment screw under the light yoke plug.

•Increase the tension by turning the screw clockwise.

•Loosen the tension by turning the screw counterclockwise

4.Retighten the setscrew, and reinstall the light yoke plug.

571/572/6300 Focus

1.Place a white towel over the chair headrest to represent the oral cavity.

2.Position the light head at the distance normally used when working in the oral cavity (select a distance representative of most procedures).

3.Turn the light on.

4.Use a large screwdriver to turn the focus adjusting screw until the light is most uniform.

Focus Adjustment Screw

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A-dec 371/372 Dental Light (Halogen 2-Axis) Rotation Adjustments

371/372 Horizontal Rotation

To adjust the horizontal rotation, use a 5/32” hex key to tighten or loosen the adjustment screw at the top of the light housing.

Horizontal

Tension

371/372 Vertical Rotation

To adjust the vertical rotation, use a 3/16” hex key to tighten or loosen the vertical tension screw.

A-dec Dental Lights    18

Dental Light Flexarm Counterbalance Adjustment

To adjust the flexarm counterbalance:

1.Use a Phillips head screwdriver to remove the end caps.

2.Use a hex key to remove the two screws that secure the cover.

3.Remove the cover.

4.Use a 1/2” combination wrench to adjust the nut on the end of the spring.

•If the dental light drifts down, turn the nut clockwise.

•If the dental light drifts up, turn the nut counterclockwise.

5.Set the cover back onto the flexarm (but donot reattach) and checkfor drift.

Vertical Tension Screw