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M400 Reference 
M400 Maintenance
The M400 components are designed for years of rugged, trouble-free use.
Cleaning the JCU II
To clean the JCU II, use a soft cloth and clean water. Mild household cleaner such as Windex can 
also be used to remove tougher stains or spots. Do not use alcohol based cleaners or any type of 
solvents as this may discolor or damage the unit.
Cleaning the Camera Optics
Warning: The M400 camera body is a remotely and automatically controlled device. Ensure 
camera motion has been disabled before cleaning surfaces that can cause pinch hazards.
Great care should be used with your camera's optics. They are delicate and can be damaged by 
improper cleaning. The M400 thermal camera lenses are designed for the harsh outdoor 
environment and have a coating for durability and anti-reflection, but may require cleaning 
occasionally. FLIR Systems, Inc. suggests that you clean the lens when image quality degradation 
is noticed or excessive contaminant build-up is seen on the lens. 
Rinse the camera housing and optics with low pressure fresh water to remove any salt deposits 
and to keep it clean. If the front window of the camera gets water spots, wipe it with a clean soft 
cotton cloth dampened with fresh water. If the window requires further cleaning, use a soft moist 
cotton-based cloth with Isopropyl alcohol or dish soap.
Do not use abrasive materials, such as paper or scrub brushes as this will possibly damage the 
lens by scratching it. Only wipe the lens clean when you can visually see contamination on the 
surface.
Cleaning the Camera Body
Warning: The M400 camera body is a remotely and automatically controlled device. Ensure 
camera motion has been disabled before cleaning surfaces that can cause pinch hazards.
Caution: The M400 is sealed at the factory against liquid water, suspended particulates, and other 
contaminants. It is important that you not open the camera for any reason, as it will compromise 
this seal and possibly damage the unit. Opening the M400 camera will void the manufacturer’s 
warranty.
Do not pressure wash the camera, especially around the FLIR logos, as that could force water 
through the camera seals. Clean the interface between the yoke and base often to prevent 
accumulation of debris or salt deposits.
If you have a problem with your thermal camera, do not attempt to repair it yourself. The M400 
camera is a sealed unit and can not be opened or serviced in the field. Consult your installation 
dealer or FLIR Systems, Inc. for repair information.