LS 135/150 Examination Light
Contents
1. dNVI Electrical Schematics LS 150 Appendix C 25 1 2 4 HINHOASNVUIL i dWV 1 88 4311111934 42V18 NV4 HOLIMS 434 NAON G 3118 113 13A 9 834 0 0000000000000 0 00 00 034 OVAZI YAWYOASNVAL T3A N49 NUO AVYO dyl AO e dyl AOZ Nu8 418 dyl LHM NONWOD ig YANYOISNVYL LS 135 150 Service Manual 443194 Rev i ii t Li Li i 318 2 H3MOd 318 2 130 scordo oli i 40123NNOO 231 i i i 2 Welch Allyn Exam Light2. 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 amp 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 l
3. 2 Completely unscrew hex nut to remove flexible arm NOTE Make sure bushing with X marks are reinstalled toward hex nut NOTE Bushing with X indicator marks are attached toward mounting plate LS 135 150 Service Manual 443194 Rev B Welch Allyn Exam Light 15 Section 4 LS 150 Wall Model Disassembly and Repair 3 Remove bushing from mounting plate NOTE Notice the wiring routing and wire connections 16 Welch Allyn Exam Light LS 135 150 Service Manual 443194 Rev B Disassembly and Repair LS 150 Floor Model Section 4 NOTE Disassembly of LS 150 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 17 Section 4 LS 150 Floor Model Disassembly and Repair 4 Unplug lamp 5 Remove lamp head by removing 5 SCTeWS NOTE Notice wiring connections to power switch PCB and wiring orientation 18 Welch Allyn Exam Light LS 135 150 Service Manual 443194 Rev B Disassembly and Repair LS 150 Floor Model Section 4 NOTE Notice switch orientation 6 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 7 Remove both pins from connector using a pin removal tool NOTE There are two wir
4. TRANSFORMER FUSE DRAWER WIRE HARNESS PWR MOD GROUND TRANSFORMER HOUSING SET IEC CONNECTOR SELF TAPPING SCREW 50 SLIT TUBING CUT WALL MOUNT BRACKET 10 32 X 312 HX DR SET SCREW GOOSENECK ASSY W END BUSHINGS 8 X 1 25 SELF TAPPING SCREW POWER CORD DETACH DOMESTIC JAPAN POWER CORD DETACH EUROPE POWER CORD DETACH UNITED KINGDOM POWER CORD DETACH AUSTRALIA BASE TOP COVER POLE POWDER COATED WIRE HARNESS BASE GN 35W PLUG MATE N LOCK AMP WIRE TIE CAP 3 CIRCUIT MATE N LOCK LS 135 LS150 BASE BOTTOM O RING 426 X 070 RETAINING RING GOOSENECK BUSHING HEAD CRUSH RIB SLEEVE O RING GooseNeck LS 135 150 O RING 4 40 X 125 SHCS BASE COVER PLATE PLATED 1 4 20 X 1 PAN HEAD PHILLIPS EXTRNL LOCKWASHER Repair Parts List Bubble 41 41 41 42 43 44 45 46 46 47 48 49 o0 o1 02 53 94 55 56 57 58 59 60 61 61 61 61 62 63 64 65 66 67 68 69 70 71 72 73 74 79 76 77 78 79 LS 135 150 Service Manual 443194 Rev B Repair Parts List Appendix A Part Description Bubble 443062 501 MOUNTING KIT LS 135 LS 150 60 443085 501 GOOSENECK ASSY 61 445014 501 Fan Assembly LS 150 82 488082 MOLEX CONNECTOR 83 443101 WIREHARNESS Goose neck LS 150 Floor 84 443190 CAUTION LABEL 85 445017 WIRE HARNESS SW RECT BD 50W 86 106124 40 6 X 625 PLASTITE LS 135 150 Base 07 445030 WIRE HARNESS BASE GOOSE NECK LS 150 88 443184 501 HARDWARE KIT LS 135 150 WALL MOUNT 89 445021 501 WIRE HARNESS G
5. and how the wiring is routed See the repair parts lists for proper fuse according to your country 24 Welch Allyn Exam Light Disassembly and Repair We LS 135 150 Service Manual 443194 Rev B Repair Parts List Part 443051 1 106108 20 106100 14 445013 443019 1 443121 443017 6 488067 501 106124 13 440029 1 445043 445020 445015 443078 761077 1 488073 502 106124 34 443083 445040 790007 443018 443103 488077 443017 5 443032 443069 455508 106124 44 443094 1 443189 443096 2 106124 43 445009 501 483412 443022 501 445027 440128 440009 1 440009 2 440009 4 440009 6 745184 443073 1 443074 745184 LS 135 150 Service Manual 443194 Rev B Description WIRE FORM LAMP HOLDER O RING 114 X 070 EPDM 70D PHPS 8 32 X 375 50 WATT LAMP W COVER GLASS LAMP NOSE HSG WHITE HEAT SHIELD NOSE LAMP HSG TOP 1 5150 RECTIFIER BOARD 2 X 1 4 SCREW PLASTITE SWITCH POWER SPST M4 8X9 5 TAPPING PAN PH SCREW LS 150 PLATE FAN MOUNTING FAN RETAINING RING WIRE TIE WIRE HARNESS LAMP REC BOARD 4 X 375 PLASTITE PHPS WIRE TIE W MOUNTING HOLE JUMPER COVER SCREW 6 X 1 2 LG LAMP HSG BOTTOM PLATE HEAT DIFFUSER Lamp Connector LS 135 LAMP HSG TOP LS 135 SWITCH SPOT POWER 35W 35 WATT LAMP Ground Label Base LS 135 150 8 32 X 500 SCREW GROUND WIRE COVER PLATE CLOSED END SPLICE GROUND WIRE MAIN 6X1 687 PL PAN PHILLIP LS 150 TRANS ASSY 50 W DOM 8 EXTERNAL LOCKWASHER LS
6. removal tool to remove connector block 4 Welch Allyn Exam Light Disassembly and Repair LS 135 150 Service Manual 443194 Rev B LS 135 Floor Model Section 4 Disassembly and Repair i i ES c b Hi F M M T E F 5 dii Mass Hu xi sn um pi n si die n 3 cst de bf VINA 4 JN a ACA dies 11 Use 3 32 hex key to remove screw flexible arm 12 Pull bottom bushing away from E RJ nO S 5 50 E e x lt ai c DO er es DO So Se G 2 vaio eo ve Welch Allyn Exam Light 5 LS 135 150 Service Manual 443194 Rev B 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 n LE n sl pi x x lj 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 Welch Allyn Exam Light 7 Section 4 LS 135 Floor Model NOTE V
7. 135 TRANS ASSY 35W DOM Plug 3 connector LS 135 150 SCHURTER FUSE BLOCK LS 135 150 Floor Model Power Cord Assy Domestic LS 135 150 Floor Model Power Cord Assy Europe LS 135 150 Floor Model Power Cord Assy UK LS 135 150 Floor Model Power Cord Assy Aust Strain Relief LS 135 150 Floor Model UK Eur Aust Strain Relief LS 135 150 Floor Model Domectic Plate Strain relief Domestic Japan Plate Strain relief Eur UK Aust Appendix A Bubble CON DIS N C0 C0 C0 C0 C0 C2 C0 C0 C0 RRR RP RRR RPP O O O OO NI 0 amp DIN NI DI OS O ONNI O OI Welch Allyn Exam Light Appendix A Part 236706 3114 236706 3112 488307 4 445010 1 443071 1 106130 11 106124 41 488307 3 236706 3117 443167 1 745150 443016 441107 236733 488042 441124 503 236732 711420 1 443157 440107 106113 10 443059 501 106124 18 761076 0 761076 2 761076 4 761076 6 443014 443153 1 443098 443091 488116 443043 443015 443105 610068 443020 440090 2 106108 7 440136 482038 106119 3 443079 1 106100 56 106106 4 2 Welch Allyn Exam Light Description FUSE 500MA Domestic Fuse 315MA Europe United Kingdom Fuse 630MA Japan TRANSFORMER 50W TRANSFORMER 35W RECEPTACLE QUICK CONNECT 12 18 SCREW 6X1 375 PL PAN PHILLIPS FUSE 800 MA Domestic Eur Aust Fuse 1A LS150 Japan CABLE ASSY WALL MOUNT STRAIN RELIEF WEIGHT LS150 STRAP
8. Exam Light 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 SCTEWS 6 Remove lamp bottom housing 2 Welch Allyn Exam Light LS 135 150 Service Manual 443194 Rev B Disassembly and Repair LS 135 Floor Model 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 backin 3 with a blunt object A screwdriver handle is shown below k POLE LS 135 150 Service Manual 443194 Rev B Welch Allyn Exam Light 3 Section 4 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 10 Use pin
9. OOSENECK HD 50W 90 440078 4 STRAIN RELIEF 91 LS 135 150 Service Manual 443194 Rev B Welch Allyn Exam Light 3 BLANK PAGE Appendix B LS 135 150 Service Manual Illustration 1 LS 150 Head Assembly Appendix B LS 135 150 Service Manual Illustration 2 LS 135 Head Assembly Appendix B LS 135 150 Service Manual Appendix B LS 135 150 Service Manual Illustration 4 LS 135 Wall Mount Appendix B LS 135 150 Service Manual Illustration 5 LS 135 150 Floor Base Assembly Appendix B LS 135 150 Service Manual Illustration 6 LS 150 Base Assembly Appendix B LS 135 150 Service Manual ag 69 9 Illustration 7 LS 135 Base Assembly Appendix B LS 135 150 Service Manual Illustration 8 LS 135 150 Goose Neck Assembly Appendix B LS 135 150 Service Manual Illustration 9 LS 150 Table Goose Neck Pole Assembly Appendix B LS 135 150 Service Manual Illustration 10 LS 135 Floor Goose Neck Pole Assembly endix C A LS 135 Electrical Schematics ve t in dVl lt AOQVvVd AVEO d JYL NUE E dVl AOZ 18 A001 LHM sl NONNOO 116 AYYNIYd H3AHOJSNVHL 5 13A N49 nid SIS es 1 11 SE OV em gt lt gt Slc gt E ACEN gt 1445 134 Sie 9 a 6 O MOT POE 4 aay e a E i OVAZI 2 i i 4M3AHOJSNVMHL 5 0000 LO ve 15
10. WelchAllyn Service Manual LS 135 150 Examination Light Welch Allyn Medical Division 4341 State Street Road P O Box 220 Skaneateles Falls NY 13153 0220 443194 Rev B Gopyright 2002 443194 A New Release of LS 135 LS 150 5 44889 07 08 2002 DK RS Exam Light Service Manual Changed Cautions and warnings 443194 Changed Section 4 5 45188 10 29 2002 DK Changed bubble numbers 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 OMIT da sd oM ERROR CR ET 1 a a an ________________6_6_______ 1 0000017717 A E A 1 SMI 2 i a camarero iere OO aca 3 Section 2 Service heoming Inspectiam CERN a de 1 FROG UOC OOE RO Re A 1 Section 3 Troubleshooting VEL TT IE OT nn 1 Eloctical chock 2 Section 4 Repair and Disassembly LS 135 Floor Model Biondi E 1 LS 135 Wall VIGGO SAADI rien 9 LS 150 Wall Model Disabili 14 45 150 OP MO 17 Appendix A Repair Parts Lists Appendix B Exploded View Photo Illustrations Appendix C Elect
11. es going to connector Remember that they go in the outer channels of the connector LS 135 150 Service Manual 443194 Rev B Welch Allyn Exam Light 19 Section 4 LS 150 Floor Model Disassembly and Repair NOTE The gooseneck with wiring and connector removed 8 Use 3 32 hex key to remove screw 9 Remove snap ring from upper flex bushing 20 Welch Allyn Exam Light LS 135 150 Service Manual 443194 Rev B Disassembly and Repair LS 150 Floor Model Section 4 10 Remove upper bushing from flexible arm 11 To remove pole from base remove screw and bottom plate 12 Disconnect ground LS 135 150 Service Manual 443194 Rev B Section 4 LS 150 Floor Model Disassembly and Repair 13 Disconnect harness 14 Pull bottom pole from base NOTE When reassembling the pole back into the base make sure wires fit into the base channel 15 Remove both pins with a pin removal tool NOTE The two red wires are to go in the two outer positions of the connector 22 Welch Allyn Exam Light LS 135 150 Service Manual 443194 Rev B Disassembly and Repair LS 150 Floor Model Section 4 NOTE The wire and connector removed from the pole 16 Remove 5 screws from base then remove top cover NOTE Notice transformer and how wiring is routed in the base LS 135 150 Service Manual 443194 Rev Welch Allyn Exam Light 23 Section 4 LS 150 Floor Model NOTE Notice the fuses and connector
12. ght from its shipping M D carton Before opening the Exam Light shipping carton check for damage 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 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 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 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 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 Section 3 Mechanical Checks 1 Gooseneck Replace if The shrink wrap is cracked damaged or pulled back from either end
13. iew of wiring and fuses domestic LS 135 Pole Model Model 44300 44302 44303 44304 44306 Application Fuse Part DOM 6 236706 3114 EUR 236706 3112 JAP 488307 4 UK 236706 3112 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 f 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 mod ule 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 Section 4 LS 135 Wall Model Disassembly and Repair 22 Unplug lamp 23 Remove lamp head by removing 5 SCTEWS 24 Remove housing 10 Welch Allyn Exam Light LS 135 150 Service Manual 443194 Rev B Disassembly and Repair LS 135 Wall Model Section 4 Note wire tie and placement of wire behind standoff 25 To disassemble disconnect wires and remove gooseneck from lamp head Reassembl
14. ngs 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 tel 1 800 535 6663 315 685 4100 fax 315 685 3361 www welchallyn com medical support tech Welch Allyn Canada Ltd 160 Matheson Blvd E Unit 2 Mississauga O
15. ntario Canada L4Z 1V4 tel 1 800 561 8797 905 890 0004 fax 905 890 0008 MD International 11300 N W 41st Street Miami FL 33178 USA tel 305 669 9003 fax 305 669 1971 Welch Allyn GMBH Zollerstrasse 2 4 72417 Jungingen Germany tel 011 49 7477 927186 fax 011 49 7477 927193 Welch Allyn France SARL 814 rue Charles de Gaulle 77100 Mareuil les Meaux France tel 011 33 1 6009 3366 Fax 011 33 1 6009 6797 LS 135 150 Service Manual 443194 Rev B Welch Allyn UK Ltd St Georges House Vernon Gate Derby England DE1 1UQ tel 011 44 01332 206208 fax 011 44 01332 206209 mob 011 44 0467 301814 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 011 612 9638 3000 fax 011 612 9638 3500 Welch Allyn Singapore Ltd 300 Beach Road 25 08 The Concourse Singapore 199589 Singapore tel 011 65 291 0882 fax 011 65 291 5780 China Service Center Room 708 Central Plaza No 227 Huang Pi Bei Road Huang Pu District Shanghai 200003 China tel 011 86 21 63279631 fax 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 011 813 5212 7391 fax 011 813 3261 7372 Welch Allyn Exam Light 3 BLANK PAGE Service Section 2 Incoming Inspection NOTE Use the following guidelines when unpacking the Exam Li
16. ow amp 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 Check connections between Pole and Gooseneck the Base and Pole and the Head and the Gooseneck If lamp still does not light then turn off unit Unplug it check the fuses located in the base 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 Disconnect Gooseneck Harness from Pole Harness Check for correct wire order Pin 1 Red Pin 2 Yellow Pin 3 White Set the meter to the lowest resistance setting Put one meter lead into the white wire pin and the other into the yellow wire pin Set the Switch on the Lamp Head to the low setting The meter should read less than 1 ohm of resistance Set the Switch to the off position The meter should read open Move meter lead from the yellow wire pin to the red wire pin Set the Switch on the Lamp Head to the high setting The meter should read less than 1 ohm of resistance Set the Switch to the off position The meter should read open Welch Allyn
17. rical 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 1s 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 ata 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 LISTES US IEC 60601 1 AS 3200 1 74227 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 Warni
18. y Note NOTE wire switch connections and placement of wire behind standoff white wire red wire yellow wire brown lamp socket wires Note For Reassembly of all floor and stand LS 135 Install switch according to this photo LS 135 150 Service Manual 443194 Rev B Welch Allyn Exam Light 11 Section 4 LS 135 Wall Model Disassembly and Repair 26 Remove the hex nut to remove mounting plate 27 Remove bushing from mounting plate Note The removal of bushing from wall mount bracket 12 Welch Allyn Exam Light LS 135 150 Service Manual 443194 Rev B Disassembly and Repair LS 135 Wall Model Section 4 Note The X on bushing should be reinstalled toward mounting plate gr Allyn Note The wiring route to switch trans 115 former Note The wire color codes and orienta tion strain relief tie wrap to secure wires See Appendix C WIRING DIA GRAMS for the correct voltage wiring connections Each country has differ ent voltage wiring connection LS 135 150 Service Manual 443194 Rev B Section 4 LS 150 Wall Model Disassembly and Repair NOTE Complete parts package for LS150 table wall mount m B A UU 1 Completely unscrew to remove nose assembly from head NOTE Notice wiring connections to power switch PCB and wiring orientation 14 Welch Allyn Exam Light LS 135 150 Service Manual 443194 Rev B Disassembly and Repair LS 150 Wall Model Section 4
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