ARRI M18 User manual

S E R V I C E M A N U A L
Date: February 7, 2019
Supported Models
L1.37600.B
M18

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Version History
Version
Author
Change Note
02/2019
S. Papke
Original version
Table of Contents
Version History ..................................................................................................................2
Table of Contents...............................................................................................................2
Important Information........................................................................................................3
Safety Instructions.............................................................................................................3
General Safety Requirements for Operating Lamphead Systems................................3
Required Tools...................................................................................................................4
Disassembling Order.........................................................................................................5
Lens Holder & Safety Glass..............................................................................................6
Reflector .............................................................................................................................8
Safety Switch Activator & Door Latch (SSA) ..................................................................9
Housing.............................................................................................................................12
Base Group & Ignitor.......................................................................................................14
Lamphead Connector Cables.........................................................................................16
Stirrup ...............................................................................................................................17
Maintenance and Care.....................................................................................................18
Visual Inspection .............................................................................................................18
Cleaning............................................................................................................................18
Testing of mechanical components...............................................................................18
Contact..............................................................................................................................19
Further Information..........................................................................................................19

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Important Information
This instruction supports only the models listed on page 1. If your model is not listed, please visit
www.arri.com/service-lighting for more information. Also, these instructions are for qualified ARRI service
personnel only. If you are not familiar with the handling of components that can be destroyed by high voltage
or electrostatic discharge, please do not use these instructions and contact the ARRI Lighting Service Team.
Safety Instructions
The following instructions contain helpful advice on how to operate your ARRI lamp head safely. Lamp
heads, lamp head systems and accessories may only be operated and used by qualified persons and only
for professional lighting purposes. Relevant operating instructions must be followed for the equipment you
are using. Please also refer to the Ordinance on Industrial Safety and Health as well as the relevant
guidelines and regulations of your national Industrial Injuries Corporation (e.g. BGI 810-1, -3 and -4, BGV A1
for Germany; OSHA or ESTA for USA; etc.). Please refer also to our leaflet "Operating your ARRI Lamp
heads safely" L5.70431.E
General Safety Requirements for Operating Lamphead Systems
Relevant Hazard Symbols and Warnings
The following symbols relate to all repairs in this manual. Use care and caution when repairing ARRI
Products.
Warning of crushing / hand injury
Warning of a pointed object
Warning of electrical voltage
a) Safety Requirements for Transport, Setup and Operation of lamp heads
» We recommend wearing suitable protective clothing when working with lamp heads in order to prevent
injuries and burns.
» In the interest of your own health and safety, we advise you to consider the weight of your lamp head and
accessories when carrying or lifting them and to observe the relevant precautions recommended by your
Occupational Safety and Health Administration (for Germany BGI 810-1).
» Please ensure that all electrical cables are routed in such a way as to prevent tripping hazards and
damage by vehicles. You can achieve this with the help of suitable signs, covers or cable crossovers.

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b) Safety Requirements Concerning Electrical Danger
» Please check the lamp head system and its electrical protection device before each use.
» The faultless function of the power supply and protection system must be ensured before connecting the
lamp head (e.g. grounding, circuit breaker).
It might be necessary to install additional protection measures; for example:
» the application of residual current operated protective devices (RCDs)
» the application of safety extra low voltage, protective separation or protective insulation
» equipotential bonding
Required Tools
1
Torx Screwdriver TX 20
2
Torx Screwdriver TX 15
3
Torx Screwdriver TX 10
4
Allen Key size 1.5mm
5
Wrench size 5.5

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Disassembling Order
The graphic shows the order in which the components must be removed to ensure a proper repair. All
components which are not preceded by a further assembly group can be exchanged directly.
WARNING: Before starting the repair please take note of the safety instructions!
Make sure that the lamp head is fully disconnected from the mains and cooled down
for a minimum of 30 minutes before opening the cover or beginning the repair.
Lamp
Cables
Ignitor
Lens
Holder
UV
Protection
Glass
Reflector
Safety
Switch
Housing
Stirrup
IMPORTANT NOTE: SEE SERVICE PARTS MANUAL FOR CORRECT VERSIONS OF
PARTS AS PER SERIAL NUMBER

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Lens Holder & Safety Glass
Loosen and remove two screws (Torx 10) to
remove the lens door from the housing.
Note: Please carefully set down the lens door
to avoid damaging the glass. This is an
opportunity to properly clean the glass using a
standard glass cleaner and a soft cloth.
Remove 4 screws (Torx 10) on the lens springs
and 1 screw (Torx 10) on the safety switch
activator pin.
Note: Pay close attention to the position of the
lens door springs.
Note: Remember when ordering the glass there
are two pieces of glass per lens door.

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Make sure when putting the components back
together, that the safety switch activator is
installed at the right position. Reassemble in
reverse order.
Please ensure that all parts go back in the
correct position.
Tip: Old versions have no spacer plate between
the lens door and the safety switch activator pin
plate.
Please follow the instructions in the safety
switch activator section.

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Reflector
Remove 4 screws (Torx 20) around the
reflector rim.3579
Reach into the reflector as pictured to avoid
leaving finger prints on the inside of the
reflector
Note: This is an opportunity to clean the
reflector with glass cleaner and a soft cloth.
matte/dull reflectors must be replaced.

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Safety Switch Activator & Door Latch (SSA)
To Remove the Safety Switch Activator
Loosen the 5.5 mm nut as shown (do NOT
remove.)3573
Loosen the worm screw with a 1.5 mm
Allen Key, carefully! This can break easily.
NOT remove, simply loosen until the safety
switch activator is loose.
The SSA can now be moved forwards or
backwards.

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Important: Do not try to adjust the SSA with the door latch!
To test the Door Latch adjustment
Use the screw to adjust the door latch if
needed.
.
When you close the lens door completely
there should be a small gap (movement)
between the black lens door and the blue
front housing.
Tip: If the gap is too big then the safety
loop can be opened and the lamphead will
not strike.

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To adjust the Safety Switch Activator
Loosen the nut and worm screw (as shown
in the instructions for the removal of the
SSA) to position the SSA correctly. Tighten
up the worm screw carefully with 1.5 mm
Allen Key. Very gently tighten the 5.5 mm
nut.
Careful! Using too much force when
tightening the screw, may break it.
To test the adjustment of the SSA.
Make sure there is enough space between
the SSA (brass) and SSA pin plate (silver)
Please refer to the picture.
Listen for a ‘click’ sound. It should click
twice before the door latch closes. If this is
not adjusted properly than the safety loop
can be opened and the lamphead will not
strike.
Note: You can also measure the safety
loop. Please see the wiring diagram.
Important: If the door latch is not adjusted
properly this affects the SSA function.

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Housing
After removing the lens door, and the
reflector, you must pull the SSA
backwards into the housing and leave
in the position as shown. Please follow
the instructions in the safety switch
activator section.
Remove the screw (Torx 20) of the
lamp lock knob. Loosen the screw and
remove completely.
Remove 4 housing screws (Torx 20.)
Two from the front and two in the back
as pictured.

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Place one hand on the skid and pull the
housing upwards from the stirrup (it can
hang on the lamp lock shaft, you may
need to wiggle the housing). Lean the
housing to the left to remove
completely.
Tip: Turning the housing 90 degrees
counterclockwise helps to avoid coming
in contact with the inside baffle.
To remove the lamp holder, unscrew
two screws (Torx 20) on the front side.
Unscrew the HT cables and disconnect.
Slide the complete lamp holder
assembly to the front and remove it
completely.

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Base Group & Ignitor
Remove the 2 screws on the bottom/front
(marked in red.)
Loosen the 2 middle screws (marked in yellow.)
Do not remove.
Place the lamphead face down with the skid
facing towards you.
Remove the 2 screws on the bottom/back
(marked in red.)
Loosen the 2 middle screws (marked in yellow.)
Do not remove.
Tip: Loosening the screws helps to get a bigger
gap in the blue housing to remove the ignitor
assembly.
Pull out the electronic box towards you to
remove.

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Tip: To reassemble loosen all 4 screws of the
skid. This alows a better fit for the base group
and the housing.
Tip: After reassembling tighten screws!

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Lamphead Connector Cables
Remove 2 screws (Torx 20.)
Remove cover.
Remove 2 screws as shown.
Note: The wiring diagrams are only available to
trained ARRI Service Technicians.

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Stirrup
Remove lens door, reflector, SSA and housing
Remove 3 screws on the inside of the front
casting (Torx 20.)
Remove two screws (Torx 15) from the internal
baffle. Remove the front casting.
Loosen 4 screws (Torx 20.) Two on each side
on the brackets. Do not remove!
Slide out the stirrup

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Maintenance and Care
Please do not forget that the safe operation of lamp heads also includes their maintenance and care. A
visual inspection should be conducted before every use, and an inspection of electrical safety should be
conducted at least once every 12 months. The results of these repeated inspections should be documented
and filed. You will find additional information for the setup and operation of your lamp head, as well as
information on the special features of the individual lamp head models, in the relevant operating instructions.
Our recommendations for maintenance of this lamphead can be found on the following pages.
Visual Inspection
We recommend a regular visual inspection. This helps to detect potential damages in an early state. This is
the only way to prevent and avoid consequential damage to other components. If your lamp head shows any
visual damage, please contact your local ARRI service partner.
Cleaning
The lamp head should be cleaned regularly. This is not just for your own safety; it also increases the lifespan
of the device significantly. The following components should be cleaned regularly:
1. Cleaning the UV protection glass:
Use conventional glass cleaner and a soft cloth for cleaning the protection glass.
2. Cleaning the reflector
Follow the steps for “Lens holder” + “Reflector”
Use conventional glass cleaner and a soft cloth for cleaning the reflector.
3. Cleaning the inner housing
Follow the steps “Lens holder” and “Housing” in this manual.
Clean the inner housing carefully with a vacuum cleaner and get rid of dust and
insects.
Testing of mechanical components
The following mechanical components should be checked regularly for functionality:
1. Safety switch
When setting or checking the safety switch you must ensure that you hear the clicking noise 2 times
before the lens door is closed completely. If you are not sure if your lamp head is set correctly please
contact immediately your local ARRI service partner for more information on how to proceed.
2. Lamp socket
Burn marks or discoloration may be an indication for contact problems. We strongly recommend a
replacement to avoid damage on the lamp head. Please contact your local ARRI service partner for
more information about how to adjust the lamp socket correctly.

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Contact
In case you have questions or recommendations, please contact the Global Application & Services
department within ARRI via email: [e-mail]
Further Information
The manufacturer disclaims liability for any damage to persons or properties which are caused by an
inappropriate operation of the fixture. Those lie in the responsibility of the operator. Visit our homepage
www.arri.com/service-lighting for downloads and software tools.