LS-135 and LS-150 Service Manual Rev B

Rev

Description

ECN #

Date

Approved

443194

A

New Release of LS 135 / LS 150 Exam Light Service Manual

5-44889

07/08/2002

DK/RS

443194

B

Changed Cautions and warnings Changed Section 4 Changed bubble numbers

5-45188

10/29/2002

DK

Part No

Drawings and/or illustrations and/or part numbers contained in this document are for reference purposes only. For current revisions call the Welch Allyn Customer Service phone number listed in Section 1 page 3.

LS 135/LS 150 Service Manual 443194 Rev. B

Welch Allyn Exam Light i

Contents

Section 1:

General Information

About the LS 135...1 About the LS 150 ...1 Approvals ... 1 Safety Warnings. ... 2 Help Information...3

Section 2:

Service

Incoming Inspection/Checklist ... 1 Required Tools ... 1

Section 3:

Troubleshooting

Mechanical checks ... 1 Electrical checks...2

Section 4:

Repair and Disassembly

LS 135 Floor Model Dissambly ... 1 LS 135 Wall Model Dissambly...9 LS 150 Wall Model Dissambly ... 14 LS 150 Floor Model Dissambly...17

Appendix A: Repair Parts Lists Appendix B: Exploded View Photo Illustrations Appendix C:

Electrical Schematic

ii Welch Allyn Exam Light

LS 135/LS 150 Service Manual 443194 Rev. B

General Information

Section 1

About the LS 135 Examination Light The LS 135 examination light is a 35-watt halogen light that produces significantly whiter, brighter light than the ordinary gooseneck units. The dual intensity control switch allows you to instantly adjust light output to meet your exact requirements. A molded lexan light head does not conduct heat, keeping the luminaire cool to the touch. Multiple installation options include floor stand, table mount, wall mount and caster base. About the LS 150 Examination Light The LS 150 features a color corrected 50 watt lamp that delivers superior light quality across the variable spectrum for more accurate color rendition. The special designed light head keeps the luminaire cool to the touch even during multiple exams. The lamp has been offset at a 12 degree angle relative to the luminaire housing, allowing an unobstructed view of the field of interest.

Approvals ETL listed UL2601-1, CSA C22.2 No. 601.1 US IEC 60601-1, AS 3200.1 IEC 60601-1-2

C

The CE mark on this product indicates that it has been tested to and conforms with the provisions noted within the 89/336/ECC Electromagnetic Compatibility Directive.

Australia EMC Framework Compliance

N344 LS 135/150 Service Manual 443194 Rev. B

Welch Allyn Exam Light 1

Section 1

General Information

Cautions and Warnings INTENSE LIGHT: Lamp is extremely bright. Do not stare at the lamp when in use. May be harmful to eyes.

CAUTION: Remove power cord from electrical outlet and allow lamp to cool 10 minutes before replacing with Welch Allyn lamp.

DANGER: Electric Shock Hazard. Refer servicing to qualified service personnel.

DANGER: Risk of explosion if used in the presence of flammable anesthetics.

HOT SURFACE: Lamp surface is hot. May be harmful to skin if touched.

NOTE: This product complies with current required standards for electromagnetic interference and should not interfere with other equipment or be affected by other compliant devices. As a precaution, avoid using this device in close proximity to other equipment.

2 Welch Allyn Exam Light

LS 135/150 Service Manual 443194 Rev. B

General Information Help Information

Section 1

To assure correct operation and performance all service and repairs must be performed by fully trained and properly equipped personnel, using genuine replacement parts and correct procedures. Failure to do so will also invalidate the product warranty. When calling, refer to the model number on the head of the Exam light.

Welch Allyn Inc. State Street Plant /Corporate Headquarters 4341 State Street Road Skaneateles Falls, NY 13153 0220, USA

Welch Allyn UK Ltd St. Georges House Vernon Gate, Derby England DE1 1UQ

tel:

1 800 535-6663 315 685 4100 fax: 315 685 3361 www.welchallyn.com/medical/support/tech

tel: fax: mob:

Welch Allyn Canada Ltd. 160 Matheson Blvd. E., Unit #2 Mississauga, Ontario Canada L4Z 1V4

Welch Allyn Australia Pty Metro Centre Unit 5 38-46 South Street Rydalmere NSW 2116, Australia Postal address: PO Box 132 Rydalmere NSW 1701, Australia

tel: fax:

1-800-561-8797 905-890-0004 905-890-0008

MD International 11300 N.W. 41st Street Miami, FL 33178 USA tel: fax:

305-669-9003 305-669-1971

Welch Allyn GMBH Zollerstrasse 2 4 72417 Jungingen, Germany tel: fax:

(011) 49 7477 927186 (011) 49 7477 927193

Welch Allyn France SARL 814 rue Charles de Gaulle 77100 Mareuil les Meaux France tel: Fax:

(011) 33.1.6009.3366 (011) 33.1.6009.6797

tel: fax:

(011) 612 9638-3000 (011) 612 9638-3500

Welch Allyn Singapore Ltd 300 Beach Road, #25-08 The Concourse Singapore 199589, Singapore tel: fax:

(011) 65-291-0882 (011) 65-291-5780

China Service Center Room 708, Central Plaza No. 227 Huang Pi Bei Road Huang Pu District Shanghai 200003 China tel: fax:

(011) 86-21-63279631 (011) 86-21-63279632

Welch Allyn Japan K.K. Bon Marusan 8F, 3-5-1 Kanda Jinbo-Cho, Chiyoda-Ku Tokyo 101-0051 Japan tel: fax:

LS 135/150 Service Manual 443194 Rev. B

(011) 44-01332-206208 (011) 44-01332-206209 (011) 44-0467-301814

(011) 813-5212-7391 (011) 813-3261-7372 Welch Allyn Exam Light 3

BLANK PAGE

Service Incoming Inspection

Section 2

NOTE: Use the following guidelines when unpacking the Exam Light from its shipping carton. 1. Before opening the Exam Light shipping carton, check for damage. 2. If damage is apparent, stop unpacking the carton and contract the shipping company for further instructions. If the carton is intact, unpack the Exam Light. 3. With the Exam Light out of its carton, check to see that all the items listed on the packing slip are in the shipping carton. 4. If an item is missing, first check the carton, then check with your receiving department. If necessary contact Welch Allyn at the Address and phone number shown in Section 1 . 5. Clean and disinfect by following the instructions printed in the Operator Manual. NOTE: Perform all functional tests before and after servicing. 6. Operate the Exam Light to verify the customer complaint before making any changes to theunit. Call the customer if the complaint is unclear. 7. If the unit has caused or is suspected of having caused an injury of any type:

DO NOT DISASSEMBLE OR REPAIR THE UNIT IN ANY WAY. Contact Welch Allyn Customer Service immediately.

Tools Required For Servicing Exam Light Phillips Screw Driver Standard Slip Joint Pliers Needle Nose Pliers Snap Ring Pliers 3/32 Hex Wrench Pin removal tool Digital MultiMeter

LS 135/LS 150 Service Manual 443194 Rev. B

Welch Allyn Exam Light 1

BLANK PAGE

Troubleshooting Mechanical Checks:

Section 3

1. Gooseneck - Replace if: The shrink wrap is cracked/damaged or pulled back from either end. The Gooseneck is damaged or kinked. If it does not hold position - “droops” when checked in 4 directions. 2. Crush Rib Sleeve and Bushing: Replace if: Damaged, cracked, or if o-rings are worn. 3. Head Rotation: Position Head so it is parallel to the floor. Rotate Head into several positions - it should hold in any position placed. If it does not hold, replace the Bushing and o-rings on the Gooseneck. 4. If the reason for repair is due to rotation issues: Turn on the unit & allow it to warm up 15 - 20 minutes, then check the rotation. If it does not hold, replace the Bushing and o-rings on the Gooseneck. 5. Housings - Head or Base: Replace any that have damage or cracks. Check the Head housings for hairline cracks around the Bushing. Replace as needed. 6. Pole: Replace any Poles that are bent. 7. Wire Harnesses/Connectors - Replace if: Pinched, broken, or wire is exposed.

Electrical Checks: The unit should NOT be plugged in at this time. 1. If Pole is not attached to the Base, check the wires at the both ends of the Pole, if wires appear not damaged, assemble Pole into the Base. 2. Check for damaged or pinched wires at the connection between the Pole and Gooseneck. 3. Plug in unit (do not do this if any wires are damaged). Turn on unit. Lamp works: 1. Turn Switch off and on several times. Light should not flicker while turned on. If you are testing the LS 135 there should be an obvious change in light output between the low & high settings. Switch should be consistent. LS 135/150 Service Manual 443194 Rev. B

Welch Allyn Exam Light 1

Section 3

Troubleshooting

Lamp does not work: 1. Turn off unit and unplug it. Check for blown or incorrect Lamp. Lamp should be 35W, 12V for the LS 135. Welch Allyn Part# 443069. Lamp should be 50 watt for the LS 150. Welch Allyn Part# 445013. 2. Check connections between Pole and Gooseneck, the Base and Pole, and the Head and theGooseneck. 3. If lamp still does not light then turn off unit. 4. Unplug it check the fuses located in the base. 5. If unit still does not light, perform Floor Model Switch Function Test.

Floor Model Switch Function Test (LS 135 Only) Note: For this test, Unit should be unplugged from outlet! A known good Lamp should be installed. 1. Disconnect Gooseneck Harness from Pole Harness. 2. Check for correct wire order:

Pin 1 = Red, Pin 2 = Yellow, Pin 3 = White.

3. Set the meter to the lowest resistance setting. 4. Put one meter lead into the white wire pin and the other into the yellow wire pin. 5. Set the Switch on the Lamp Head to the low setting. The meter should read less than 1 ohm of resistance. 6. Set the Switch to the off position. The meter should read open. 7. Move meter lead from the yellow wire pin to the red wire pin. 8. Set the Switch on the Lamp Head to the high setting. The meter should read less than 1 ohm of resistance. 9. Set the Switch to the off position. The meter should read open.

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LS 135/150 Service Manual 443194 Rev. B

Disassembly and Repair

LS 135 Floor Model

Section 4

NOTE: Disassembly of LS-135 Floor model. 1. Loosen the screw that secures the lamp nose assembly.

2. Lift lamp nose assembly.

3. Release the lamp retaining spring.

LS 135/150 Service Manual 443194 Rev. B

Welch Allyn Exam Light 1

Section 4

LS 135 Floor Model

Disassembly and Repair

4. Unplug lamp.

5. Remove lamp head by removing 5 screws.

6. Remove lamp bottom housing.

2 Welch Allyn Exam Light

LS 135/150 Service Manual 443194 Rev. B

LS 135 Floor Model

Disassembly and Repair

Section 4

LS-135 Reassembly Note: Notice wire tie and placement of wire behind standoff.

7. To disassemble, disconnect wires and remove gooseneck from lamp head.

Reassembly Note: NOTE: wire /switch connections and placement of wire behind standoff. white wire red wire yellow wire brown lamp socket wires 8.

Use small flat blade screwdriver to pry the tabs of pole then pull gooseneck bushing out.

Reassembly Note: Press the tabs back in with a blunt object. A screwdriver handle is shown below.

POLE

POLE LS 135/150 Service Manual 443194 Rev. B

Welch Allyn Exam Light 3

Section 4

Disassembly and Repair

LS 135 Floor Model

9. Gooseneck assembly can be disassembled as per the following steps.

Note: Colors of wiring harness on pole-end of gooseneck. Red wire is in ‘key’ side of connector.

YELLOW

WHITE

RED

10. Use pin removal tool to remove connector block.

4 Welch Allyn Exam Light

LS 135/150 Service Manual 443194 Rev. B

Disassembly and Repair

LS 135 Floor Model

Section 4

11. Use 3/32” hex key to remove screw.

3/32” hex key

12. Pull bottom bushing away from flexible arm. Note the o-rings on lower flex bushing.

13. Remove snap ring from upper flex bushing.

LS 135/150 Service Manual 443194 Rev. B

Welch Allyn Exam Light 5

Section 4

LS 135 Floor Model

Disassembly and Repair

14. Remove upper bushing from flexible arm.

Note: View of completely disassembled gooseneck assembly and wire harness.

15. To remove pole from base, remove screw and bottom plate.

6 Welch Allyn Exam Light

LS 135/150 Service Manual 443194 Rev. B

Disassembly and Repair

LS 135 Floor Model

Section 4

16. Disconnect ground.

17. Disconnect harness.

18. Remove 5 screws from base. Remove top cover.

LS 135/150 Service Manual 443194 Rev. B

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Section 4

LS 135 Floor Model

Disassembly and Repair

NOTE: View of wiring and fuses: (domestic LS-135 Pole Model) Model: 44300

Application: Fuse Part # DOM #6 236706-3114

44302

EUR

236706-3112

44303

JAP

488307-4

44304

UK

236706-3112

44306

AUST

236706-3112

NOTE: View of transformer (domestic LS-135 Pole Model): See APPENDIX C for wiring schematic of your country.

Reassembly Note: Carefully align wires in groove to prevent damage to insulation when inserting pole in base.

8 Welch Allyn Exam Light

LS 135/150 Service Manual 443194 Rev. B

Disassembly and Repair

LS 135 Wall Model

Section 4

NOTE: The 135 wall mount version of the exam lamp is similar to the 135 floor model. The heads are identical in every way. The major difference is the transformer module and one continuous cord running from it up to the head.

19. Remove phillips screw . Tilt nose up and remove. Unplug Lamp connector.

20. Lift lamp nose assembly.

21. Release the lamp retaining spring.

LS 135/150 Service Manual 443194 Rev. B

Welch Allyn Exam Light 9