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A CRT monitor (Cathode Ray Tube monitor) is an early type of display device that uses electron beams and phosphor-coated screens to produce images. Before the rise of modern LCD panels, CRT monitors were the standard display technology used in computers, televisions, and industrial control systems.
In the field of CNC (Computer Numerical Control), CRT monitors played an essential role as the main interface between the operator and the control system. They displayed machining parameters, system status, alarms, and even graphic simulations of tool paths.
Although CRT technology is now considered outdated, it remains a crucial part of many older CNC machines that are still in operation today.
In CNC systems, the display unit is more than just a screen—it’s the operator’s window into the control logic of the machine. During the 1980s and 1990s, CRT monitors were standard equipment in most CNC control systems, including popular models from FANUC, Mitsubishi, and Siemens.
CRT monitors were favored for several reasons:
In many machine tools, the CRT display unit was integrated with the control panel, combining the monitor, keypad, and input interface into a single assembly.
Among CNC manufacturers, FANUC made extensive use of CRT monitors in its classic control systems such as 0 series, 0iA, 0iB, 15, 16, and 18 series.
Most of these controls featured 9-inch monochrome CRT displays, while higher-end models offered 9-inch or 14-inch color CRTs. The color versions provided a larger and brighter screen, which was particularly useful for graphic simulation and tool path visualization.
Common CRT display units used in FANUC systems include:
These display units were paired with Display Boards, Power Supply Boards, and Connector Cables to form a complete display system.
Starting around 2005, FANUC gradually began replacing CRT monitors with LCD (Liquid Crystal Display) screens. This change began with the later versions of the 15, 16, and 18 series, and continued into the i-series controls.
Early LCD screens were available in monochrome 7.2-inch or 9.5-inch versions, as well as color 8.4-inch, 10.4-inch, and later 15-inch LCDs with optional touch and handwriting functions.
Compared to CRT monitors, LCD displays offered several advantages:
Today, most newly produced CNC systems use LCD screens, but countless older machines still rely on CRT monitors for daily operation.
As time goes by, many CRT monitors begin to show common issues such as dim brightness, image flickering, or startup failure.
When this happens, there are usually two solutions:
If you’re interested in knowing more about how to repair or replace FANUC CRT monitors, including compatible LCD retrofit options, please check our detailed guide here:
Convert FANUC CRT to LCD – The Ultimate Upgrade for Your CNC Display
CRT monitors once represented the backbone of CNC visualization and control. Although replaced by LCD technology, they remain vital for maintaining many legacy machines still in production today.
At CNC FIXTECH, we continue to provide FANUC original and compatible display units, including CRT and LCD models, along with professional repair and replacement services for CNC display systems.
Whether you need to maintain a classic FANUC 0 series control or upgrade to a modern LCD display, our team can provide the right solution for your system.
A CRT monitor (Cathode Ray Tube monitor) in a CNC system is a display unit used to show machining parameters, alarm messages, and graphic simulations. It works by using an electron beam to project images onto a phosphor-coated screen. CRT monitors were standard in older FANUC and Mitsubishi CNC control systems before LCD screens became popular.
Many classic FANUC control models, such as the 0 series, 0iA, 0iB, 15, 16, and 18 series, were equipped with CRT monitors.
Most of them used 9-inch monochrome CRT displays, while higher-end models featured 9-inch or 14-inch color CRTs for better visibility and graphical display performance.
Over time, CRT monitors may experience:
When these issues occur, you can either repair the CRT or upgrade to an LCD replacement depending on your needs and system type.
Yes, although CRT monitors are no longer produced by most manufacturers, replacement units and refurbished parts are still available through specialized CNC repair companies like CNC FIXTECH. In addition, LCD conversion kits are now a popular long-term alternative.
You can find the model number on the label at the back or side of the display unit. Common FANUC CRT models include A61L-0001-0093, A61L-0001-0076, and A61L-0001-0096.
If the label is missing or unclear, you can also check your CNC control series (e.g., FANUC 0M, 16i, or 18T) and consult a professional technician to confirm the correct display model.
If you need to preserve the original appearance of a vintage machine, repairing the CRT can be worthwhile.
However, if you want a longer-lasting, low-maintenance solution, upgrading to an LCD display is recommended. LCD replacements are brighter, lighter, and compatible with most older FANUC systems.
At CNC FIXTECH, we offer:
Contact us for professional advice on selecting the best display solution for your CNC system.
How we process your repair requirements
Get in touch with us and provide as much detail as possible about the issue you are experiencing.
Our professional repair team will help assess the severity of the problem and the possibility of repair.
The customer sends or delivers the servo drive to our company. We register it in our system and prepare it for further inspection.
Our engineers diagnose the fault points of the servo drive and provide a detailed inspection report, including the final repair cost and estimated repair time.
We provide the repair quote to the customer and wait for their confirmation. If the customer agrees to the quote, we proceed with the repair.
Upon customer approval, we carry out the necessary repairs. After repairs are completed, we perform tests with the motor and conduct aging tests to ensure the servo drive operates reliably under various conditions. Once the testing is successful, we register the drive for delivery.
The customer completes the payment, and we deliver the repaired servo drive to the customer.
We provide attentive follow-up service to ensure customer satisfaction and address any further needs.
