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Berchtold CHROMOPHARE

Stryker Berchtold CHROMOPHARE Service And Parts Manual

CHROMOPHARE®
Surgical Lights, Single and Combination Lights
Service and Parts Manual
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Table of Contents
1. Warnings and Cautions ....................................................................................................................... 1
2. Product Symbols ................................................................................................................................. 2
3. ESD Procedure .....................................................................................................................................3
4. Comprehensive Tools .......................................................................................................................... 4
5. System Architecture ............................................................................................................................ 5
5.2.1 Single Light, Classic Cardanic Unit (A.C) .......................................................................................... 6
5.2.2 Light Combination, Classic Cardanic Unit (A.C) ............................................................................. 6
5.2.3 Single Light, Flat Cardanic (N.C.) ....................................................................................................... 7
5.2.4 Light Combination, Flat Cardanic (N.C) ........................................................................................... 7
5.2.5 Single Light, New Flat Cardanic (N.F.C) ............................................................................................ 8
5.2.6 Light Combination, New Flat Cardanic (N.F.C) ............................................................................... 8
5.3.1 Single Light, Classic Cardanic (A.C) ................................................................................................... 9
5.3.2 Single Light, Flat Cardanic (N.C) ........................................................................................................ 9
5.3.3 Single Light, New Flat Cardanic (N.F.C) .......................................................................................... 10
5.4.1 E Series With Emergency Power .......................................................................................................11
5.4.2 E Series Without Emergency Power ................................................................................................. 12
5.6.1 VPA Single (Stand-Alone) Mount ..................................................................................................... 14
5.6.2 VPA Video Power Arm/Light Combination .................................................................................... 14
5.6.3 VPA Video Power Arm/Light/Flat Panel Combinatio ...................................................................15
5.6.4 Shoulder Mount VPA Video Power Arm/Light/Light/Flat Panel/Shoulder ............................. 15
5.7.1 Single Monitor Support Arm ............................................................................................................. 16
5.7.2 Dual Monitor Support Arm ............................................................................................................... 16
6. Unpacking/Packing ........................................................................................................................... 17
7. Suspension Maintenance ..................................................................................................................19
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7.9.1 Classic Cardanic for Light Head or Monitor Yoke .........................................................................30
7.9.2 Flat Cardanic .........................................................................................................................................31
7.9.3 New Flat Cardanic (N.F.C) .................................................................................................................. 32
7.10.1 Horizontal Arm Brakes........................................................................................................................35
7.10.2 Light/Flat Panel Spring Arm Brakes .................................................................................................35
7.10.3 Cardanic Brakes on a Classic ............................................................................................................36
7.10.4 Cardanic Brakes on the Flat Cardanic ............................................................................................ 36
7.10.5 Cardanic Brakes on New Flat Cardanic .......................................................................................... 36
7.10.6 Light Head Brakes ................................................................................................................................ 37
7.10.7 VPA Spring Arm Brakes ....................................................................................................................... 37
7.11. Adjustments for Lights, Flat Panel, and VPA Suspensions ...........................................................38
7.11.1 Spring Arm Height Adjustment for Lights and Flat Panel Spring Arms .................................. 38
7.11.2 Flat Cardanic Height Adjustment ...................................................................................................38
7.11.3 Height Adjustment for NFC Spring Arms ....................................................................................... 39
7.11.4 Counter Balancing the Spring Arm for Lights and Flat Panels .................................................39
7.11.5 VPA Spring Arm Up/Down Brakes ....................................................................................................40
7.11.6 VPA Height Stop Detents .................................................................................................................... 41
7.15.1 Dual Flat Panel Spring Arm Counterweight Adjustment ........................................................... 47
7.16.1.1 Changing/Replacing Stop Location ................................................................................................ 51
7.17.1 Replacing Height Compensation Tube (HCT) on Horizontal Arm ........................................... 53
7.17.2 Replacing internal wiring on Horizontal Arm (light suspension only) ................................... 55
7.19.1 General Information ........................................................................................................................... 58
7.19.2 Endo Repair ........................................................................................................................................... 61
8. Cardanics
9. Light Head Maintenance ...................................................................................................................82
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........................................................................................................................................... 66
8.1.1 Cardanic Replacement for EXX0/EXX5 Light Heads (Halogen/HID)........................................ 66
8.1.2 Cardanic Replacement for EXX8 Light Heads (E LED) ................................................................. 68
8.1.3 Cardanic Replacement for FXX8 Light Heads (F-Gen) ................................................................ 71
8.1.4 F-Generation Cardanic Security Tool: ............................................................................................. 71
9.1.1 Light Handle Replacement ................................................................................................................ 83
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9.3.1 Accessing the light head internals ................................................................................................... 84
9.3.2 Lower Glass Replacement .................................................................................................................. 85
9.3.3 Frame/Frame Seal/Glass Seal Replacement ................................................................................. 85
9.3.4 Distribution Board ............................................................................................................................... 87
9.3.5 LED Module replacement ..................................................................................................................89
9.3.6 Light Head Reassembly (Refer to 9.3.1 for Illustrations) ............................................................. 91
9.4.1 Dome Removal and Replacement Exx0/Exx5 ............................................................................... 92
9.4.2 EndoLite ................................................................................................................................................ 93
9.4.3 Lower Glass Assembly ......................................................................................................................... 94
9.4.4 Replacing the Filter Glass Assembly ................................................................................................ 95
9.4.5 Circuit Boards .......................................................................................................................................98
9.4.6 Cuircuit Board Replacement ............................................................................................................. 98
9.4.6.1 CPU Board...............................................................................................................................98
9.4.6.2 Camera Board (only with in-light option) ............................................................................99
9.4.6.3 Dimming Control Board (E550/650) .................................................................................. 100
9.4.6.4 EVG Board (E655/805) ......................................................................................................... 100
10. Control Panels ..............................................................................................................................104
11. Power Supply Service Instructions ............................................................................................... 117
12. Preventative Maintenance ............................................................................................................ 123
13. Contact Information .....................................................................................................................124
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1. Warnings and Cautions
Please read this manual and follow its instructions carefully. The words WARNING, CAUTION, and Note carry special meanings and should be carefully reviewed:
WARNING: The personal safety of the patient or user may be involved. Disregarding this
information could result in injury to the patient or user.
CAUTION: Special service procedures or precautions must be followed to avoid damaging the instrument.
WARNING: A lightening bolt is intended to warn of the presence of hazardous voltages. Refer all service to authorized personnel.
WARNING: Potential explosion hazzard.
WARNING: A yellow box with a hand within a triangle is intended to warn the user of the
presence of an electrostatic sensitive device. Follow ESD prevention procedures.
Note: Special information to make maintenance easier or important information more clear.
To avoid potential serious injury to the user or the patient or both and to avoid damage to this device, the user must adhere to the following warnings and cautions.
• Do not add additional weight to the surgical lights.
• Do not place anything over the surgical lights.
• Do not look directly into the surgical light while powered on.
• Do not operate the surgical light if any component of the light (such as the glass) is damaged.
1. Stryker trained personnel are the only personnel authorized to install the equipment described in this manual.
2. Attempt no repairs or adjustments, unless specically instructed to do so in this manual.
3. Disconnect the unit from the electric outlet before inspecting or servicing system components. Note that more than one electrical supply may be used. Disconnect all power sources before inspecting.
4. The electrical installation of the operating room must comply with any applicable IEC, CEC, NEC requirements as well as the local codes and pre-installation manual.
5. Do not use accessories or cables other than those provided or recommended. Such use may result in increased electromagnetic emissions or decreased electromagnetic immunity of the equipment or system. Use of components or accessories not recommended by Stryker/Berchtold may result in reduced performance or system breakdown.
Note: Test Equipment after servicing.
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2. Product Symbols
An exclamation mark within a triangle is intended to alert the user to the presence of important operating and maintenance (service) instructions in the literature accompa­nying the product.
A lightning bolt within a triangle indicates the presence of hazardous voltage. Refer all service to authorized personnel.
Denotes oxygen explosion hazard.
Denotes usage tips and useful information.
Denotes compliance to European Community Directive 93-42-EEC.
Indicates hot surfaces.
Denotes compliance to UL 60601-1, CAN/CSA C22.2 No. 601.1, CAN/CSA C22.2 NO.
601.2XX
Denotes the date the equipment was manufactured.
Denotes the manufacturer of the device.
A yellow box with a hand within a triangle is intended to warn the user of the presence of an electrostatic sensitive device. Follow ESD prevention procedures.
In accordance with European Community Directive 2002/96/EC on Waste Electrical and Electronic Equipment, this symbol indicates that the product must not be disposed of as unsorted municipal waste but should be collected separately.
Note: The device does not contain any hazardous materials.
Legal regulations may include specications regarding the disposal of this product. Please contact Stryker/Berchtold to withdraw this device from service for discard.
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3. ESD Procedure
3.1. Electrostatic Discharge
Static electricity is a stationary form of electrical charge. This charge is due to the transfer of electrons within a body or from one body to another. The magnitude of the charge depends on the size, shape, composition and electrical properties of the substance that make the bodies.
Once a body develops a static charge, it will look for a conductive surface to discharge. This is called Electrostatic Discharge (ESD). This discharge is only felt when the charge is larger than 3500 volts, yet many components are sensitive well below this level.
Potentially dangerous levels of ESD can generate from the following common manufacturing sources:
• Plastic (bags, containers, binders)
• Paper (procedures, DHRs, pick slips)
• CRT Monitors
• Clothing
Subassemblies and equipment that contain ESD sensitive devices (without adequate circuitry) are also ESD sensitive.
Avoid sliding ESD sensitive components across other materials. Sliding materials together can create the build up of an electrostatic charge.
3.2. Electrostatic Dissipative Wrist-Straps
Wrist-straps should be worn during the handling of ESD sensitive devices. The wrist-strap should contain an internal 1Mohm resistor to protect the operator in the case of accidental high voltage being applied to the workstation surface.
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4. Comprehensive Tools
4.1. Required Tools
• Genie lift or equipment lift, SLC-12 or equivalent
• Torpedo level
• Metric allen set
• Wrench Set
• Small and large phillips head
• Small and Large at head screw driver
• Snap ring plier
• Torque Wrench
• Spreader Forceps
• Screw Removal Tools
• Digital Level
• Wire Strippers
• Soldering Iron
4.2. Optional Tools
• Porta band saw
• Large hand le
• 1/2 inch Drill/Driver
• Tape measure
• Drill bit set
• Hand tool pouch
• Adjustable wrench
• Roofer’s square
• Hammer
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5. System Architecture
5.1. Model Plate
The Model Plate is located next to the suspension installation point on the housing of the Light Head or the VPA Pod.
1. Version Number
2. Model Number
3. Year of Manufacture (A=1993, B=1994, etc.)
4. Sequential Numbering
5. CE Mark
6. Symbol for Camera Preparation (optional)
7. Health Industry Bar Code
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5.2 CHROMOPHARE (Ceiling)
The following sections apply to models E 520, E 550, E 558, E 650, E 655, E 668, E 778, E 800, E 805, F 528, F 628.
Note: Suspension in use applies to both E and F series Lights.
5.2.1 Single Light, Classic Cardanic Unit (A.C)
1. Ceiling Cover 5. Vertical Gimbal Joint 9. Panel Frame
2. Ceiling Tube Ø 125 mm 6. Horizontal Gimbal Joint 10. Light-Output Surface (Facing)
3. Horizontal Arm 7. Light Head Hood Support 11. Handle Assembly
4. Spring Arm 8. Rail 12. Control Unit
5.2.2 Light Combination, Classic Cardanic Unit (A.C)
1. Ceiling Cover 6. Vertical Gimbal Joint 11. Light-Output Surface (Facing)
2. Ceiling Tube Ø 125 mm 7. Horizontal Gimbal Joint 12. Handle Assembly
3. Horizontal Arm 8. Light Head Hood Support 13. Control Unit
4. Height Adjustment Tube 9. Panel Frame
5. Spring Arm 10. Rail
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5.2.3 Single Light, Flat Cardanic (N.C.)
1. Ceiling Cover 5. Horizontal Gimbal Joint 9. Light-Output Surface (Facing)
2. Ceiling Tube Ø 125 mm 6. Light Head Hood Support 10. Handle Assembly
3. Horizontal Arm 7. Panel Frame 11. Control Unit
4. Spring Arm 8. Rail
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5.2.4 Light Combination, Flat Cardanic (N.C)
1. Ceiling Cover 5. Spring Arm 9. Rail
2. Ceiling Tube Ø 125 mm 6. Horizontal Gimbal Joint 10. Light-Output Surface (Facing)
3. Horizontal Arm 7. Light Head Hood Support 11. Handle Assembly
4. Height Adjustment Tube 8. Panel Frame 12. Control Unit
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5.2.5 Single Light, New Flat Cardanic (N.F.C)
1. Ceiling Cover 6. Panel Frame
2. Ceiling Tube Ø 125 mm 7. Rail
3. Horizontal Arm 8. Light-Output Surface (Facing)
4. Spring Arm 9. Handle Assembly
5. Horizontal Gimbal Joint 10. Control Unit
5.2.6 Light Combination, New Flat Cardanic (N.F.C)
1. Ceiling Cover 7. Light Head Hood Support
2. Ceiling Tube Ø 125 mm 8. Panel Frame
3. Horizontal Arm 9. Rail
4. Height Adjustment Tube 10. Light-Output Surface (Facing)
5. Spring Arm 11. Handle Assembly
6. Horizontal Gimbal Joint 12. Control Unit
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5.3 CHROMOPHARE E 520, E 550, E 558, F 528, F 628 (Wall)
Note: Suspension in use applies to both E and F series Lights.
5.3.1 Single Light, Classic Cardanic (A.C)
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1. Transformer Housing 6. Vertical Gimbal Joint 11. Panel Frame
2. Mains Switch 7. Control Unit 12. Rail
3. Wall Bracket 8. Horizontal Gimbal Joint 13. Underglass
4. Horizontal Arm 9. Light Head Hood Support 14. Camera Cable Connection Socket
5. Spring Arm 10. Handle Assembly
5.3.2 Single Light, Flat Cardanic (N.C)
1. Transformer Housing 6. Vertical Gimbal Joint 11. Panel Frame
2. Mains Switch 7. Control Unit 12. Rail
3. Wall Bracket 8. Horizontal Gimbal Joint 13. Underglass
4. Horizontal Arm 9. Light Head Hood Support 14. Camera Cable Connection Socket
5. Spring Arm 10. Handle Assembly
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5.3.3 Single Light, New Flat Cardanic (N.F.C)
1. Mains Switch 6. Spring Armt 11. Panel Frame
2. Transformer Housing 7. Horizontal Gimbal Joint 12. Rail
3. Camera Cable Connection Socket 8. Control Unit 13. Light Head Hood Support
4. Wall Bracket 9. Underglass
5. Horizontal Arm 10. Handle Assembly
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5.4. CHROMOPHARE E 520, E 550, E 558, F 528, F 628 (Mobile)
5.4.1 E Series With Emergency Power
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1. Stand Base (control unit, main fuses, batteries, charger) 7. Side Shaft Control Panel
2. On/OFF Switch 8. Lamp Frame
3. Control Unit 9. Rail
4. Stand Pillar 10. Light-Emission Lens
5. Spring Arm 11. Hand Grip
6. Light Head Hood Holder
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5.4.2 E Series Without Emergency Power
1. Base 6. Stand Pillar 11. Rail
2. Main Fuse Mount 7. Spring Arm 12. Light-Emission Lens
3. Connector Port for Camera Cable 8. Light Head Hood Holder 13. Handle
4. Transformer, Electronics 9. Side Shaft Control Panel
5. Control Unit 10. Lamp Frame
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5.5 F Series (Mobile)
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1. Stand Base 7. Light Fram
2. Charge Level Display and On/OFF Switch 8. Rail
3. Double Castors with Parking Brake 9. Light Head Cover Casting
4. Cable Hook 10. Underglass
5. Tubular Stand 11. Replaceable Sleeve
6. Spring Arm
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5.6. Chromophare VPA Video/Power Arm
5.6.1 VPA Single (Stand-Alone) Mount
1. Ceiling Cover 6. Service Pod
2. Ceiling Tube Ø 125 mm 7. 115V Duplex Power Outlet
3. Horizontal Arm 8. Data Plates
4. Height Adjustment Tube 9. Cord Management
5. Spring Arm 10. AccessHandle
5.6.2 VPA Video Power Arm/Light Combination
1. Ceiling Cover 7. 115V Duplex Power Outlet
2. Ceiling Tube Ø 125 mm 8. Data Plates
3. Horizontal Arm 9. Cord Management
4. Height Adjustment Tube 10. Access Handle
5. Spring Arm 11. Light Head
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5.6.3 VPA Video Power Arm/Light/Flat Panel Combinatio
1. Ceiling Cover 7. 115V Duplex Power Outlet
2. Ceiling Tube Ø 125 mm 8. Data Plates
3. Horizontal Arm 9. Cord Management
4. Height Adjustment Tube 10. Access Handle
5. Spring Arm 11. Light Head
6. Service Pod 12. Monitor Yoke
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5.6.4 Shoulder Mount VPA Video Power Arm/Light/Light/Flat Panel/Shoulder
1. Ceiling Cover 7. 115V Duplex Power Outlet
2. Ceiling Tube Ø 125 mm 8. Data Plates
3. Horizontal Arm 9. Cord Management
4. Height Adjustment Tube 10. Access Handle
5. Spring Arm 11. Light Head
6. Service Pod 12. Monitor Yoke
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5.7. ChromoView Monitor Supports(Yoke)
5.7.1 Single Monitor Support Arm
5.7.2 Dual Monitor Support Arm
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6. Unpacking/Packing
6.1 Transport Inspection
Warning: Use caution when lifting heavy objects to avoid serious bodily injury or
damage to the equipment.
Check the delivery immediately for completeness and any damage during transport.
For obvious damage to the component delivered contact technical support for proper disposition and replacement component.
To limit damage, use the original packaging when returning a product to Stryker/Berchtold. Provide the following information: Account’s Name and Address, Serial Number(model plate), and a description of the defect.
Caution: The Light Head may sustain damage during transport as a result of inadequate
packaging.
1. Secure the Light Head using the carton segments and cushioning provided.
2. Place the cushioning into the corresponding recesses.
3. Observe the following handling procedure.
1. Place two carton segments into the carton with the cut-out facing upwards.
2. Place the sterilizable replaceable sleeves into the corresponding recesses provided.
Note: If 2 replaceable sleeves are sent together the focusing unit must be placed into the recess with one replaceable sleeve attached.
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3. Place the cushioning into the corresponding recesses as shown in the illustration.
4. Position the Light Head in accordance with the cut-out and in accordance with the diagram.
5. The cardanic suspension MUST be pressed into the cushioning.
6. Place the carton segment onto the light head such that the recesses match the cushioning.
Caution: If the cushioning is not placed into the correct cut-outs and the cardanic
suspension is not pressed rmly into the cushioning, there is a risk that the Light Head could sustain damage during transport.
1. Place the cushioning into the appropriate recesses.
2. Ensure that the light head is held securely by the cushioning.
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7. Suspension Maintenance
7.1. Leveling Suspensions
1. Single or dual light or any combination on suspension, place the light head of at panel under the center of the mount.
Example:
Dual Suspension with
Lightheads Under Center
2. Once the light heads are under center, place a level on the top of the suspension arm and attach with wire ties or any other means available.
3. Remove the ceiling cover.
4. Loosen the top nuts about two turns each and pick 3 of the studs which is every other one as per the following example.
Single Suspension with Lighthead
Under Center
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5. This illustrates using ever other stud for leveling purposes. Make a triangle for less adjustment points.
6. With the arms in opposite directions to distribute the weight equally make the adjustments, with the level or levels attached to the arms slowly turn the bottom nuts until the arm is level and if doing a dual check the other arm for level and make adjustments as necessary.
7. Tighten the top nuts on the three studs used for leveling and rotate the arm or arms 90 degrees and recheck level. If they display level then tighten the other three top and bottom nuts.
8. Recheck level in both directions and adjust if necessary
9. Reinstall the ceiling cover.
7.2. Replacing the Ceiling Tube
WARNING: Before performing the following steps, the electricity for the Lights and/or
Monitors has to be powered OFF.
Note: If suspension has a Flat Panel Arm, the cables shall be back pulled from the doc station.
1. Remove Light Head or Monitor Yoke, Spring Arm, Suspension, and Ceiling Cover.
2. Unscrew all six securing nuts (1) with at washers from the ceiling anchor plate/ceiling ring/ceiling void assembly. The adjusting nuts onthe ceiling side (2) remain on the threaded bolts.
3. Remove the ange tube.
4. Pass the ange of the ceiling tube over the six free threaded bolts of the ceiling anchor plate.
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Note: Ensure ceiling tube is level using a digital level.
5. Apply at washers and mounting nuts to three threaded bolts by hand, spaced at 120° intervals.
6. Align the ceiling tube vertically in the room using a level and the adjustment screws on the ceiling side.
7. Little by little, tighten the mounting nuts ensuring that the alignment of the ceiling tube is maintained.
8. Screw the mounting nuts with washers from step 1 onto the other three threaded bolts, and with tighten torque to 34 N-m.
9. Attach both halves of the securing ring to the ceiling tube using a rubber gasket for ceiling cover.
10. Adjust the ceiling cover ush with the ceiling.
11. Screw the ceiling cover tight using the securing ring(3).
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7.3 Replacing a Suspension for Lights and Light/Flat Panel Combination Suspensions
WARNING: Before performing the following steps, the electricity for the Lights and/or
Monitors has to be powered OFF.
Note: When replacing a Suspension with a Flat Panel Arm the cables shall be back pulled from the doc station.
1
Ceiling Tube
2
Connection cable for light 1
3
Connection cable for light 2
4
4-pole connection plug for light 1, 4 poles used, 2-pole CAN bus (black/white)/2-pole video(brown/white)
5
4-pole connection plug for light 2, 2 poles used, 2-pole CAN bus(black/white)/2-pole-video not used
6
Light 1 connector, power supply
7
Light 2 connector, power supply
8
Central Bearing Shaft
9
Horizontal Arm
1. Remove Light Head or Monitor Yoke and Spring Arm as instructed in section 7.9.
2. Disconnect plug in connectors 4-7.
3. Remove the ve countersunk bolts with 5mm Allen wrench (1) leaving the shoulder screw attached.
WARNING: The suspension WILL fall if the safety screw is removed at this time. Ensure
suspension is secure on lift prior to proceeding to the next step.
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4. Remove the safety shoulder screw (1) and tighten to 5 N-m using 5mm hex key.
5. Lower arm and attach replacement arm to lift for installation.
6. Raise arm up to the ceiling tube and attach plug-in connectors 4-7.
7. Push the central bearing shaft into the ceiling tube. In so doing, make sure the mounting holes are lined up with the holes in the ceiling tube.
8. Insert the safety shoulder screw(1) and tighten to 5 N-m using 5mm hex key.
9. Apply ve countersunk bolts with hexagonal sockets (1) into the remaining slots and tighten to 12 N-m using a 5mm hex key.
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7.4. Replacing the Horizontal Arm on a Wall Single Light
WARNING: Before performing the following steps, the electricity for the Lights and/or
Monitors has to be powered OFF.
CAUTION: There is a risk of injury from spring-loaded joints. If the spring arm is
released under tension, it will move quickly and uncontrollably, possibly causing injury or damage to equipment.
1. Hold onto the spring arm when installing or removing the light head.
2. Avoid putting pressure on the spring arm and releasing it suddenly.
3. Spring arm should always have the stop set for the spring arm to be parallel
1. Remove Light Head as instructed in section 7.9.
2. Remove Spring Arm as instructed in section 7.6.
3. Loosen cap screws(2).
4. Remove the cover cap(1).
5. Remove Brake Screw(3).
6. Locate terminal block on the bearing journal.
7. Disconnect the cables from the terminal block.
8. Pull up squarely on Horizontal arm and remove (horizontal arm is held on by gravity).
9. Install new arm.
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10. Reconnect the cables to the terminal block.
Cantilever Wall bracket
green/yellow connect to green/yellow
white connect to red
black connect to black
11. Reinstall the cover cap (1).
12. Reinstall cap screws (2).
13. Install brake screw (3).
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14. Install Spring Arm as instructed in section 7.6.
15. Install Light Head as instructed in section 7.9.
7.5. Replacing a Spring Arm for Light Head or Flat Panel Support Arm (Ceiling
Suspension)
WARNING: Before performing the following steps, the electricity for the Lights and/or
Monitors has to be powered OFF.
CAUTION: There is a risk of injury from spring-loaded joints. If the spring arm is
released under tension, it will move quickly and uncontrollably, possibly causing injury or damage to equipment.
1. Hold onto the spring arm when installing or removing the light head.
2. Avoid putting pressure on the spring arm and releasing it suddenly.
3. Spring arm should always have the stop set for the spring arm to be parallel.
1. Remove the Light Head or Monitor Yoke as instructed in section 7.9.
2. Remove the round-headed screw (7) from the thread of the safety screw and cover (6).
3. Remove the brake screw (5), round screw (4), and safety screw (3).
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