Canon imageRUNNER ADVANCE C3500 III Series, Service Manual, Page: 561 / 1252

• When this function is enabled, a mask screen is displayed on the Control Panel. When the function is disabled, the original
screen is displayed again.
Example of the displayed mask screen
• This function is disabled when the following operations are performed.
• Press [LUI MASK] on the service mode top screen.
• Exit Remote Operation Viewer.
• The remote access is disconnected due to a network failure, etc.
• The machine is shut down (power down) or restarted.
• If this function is disabled while the service mode is being operated, the service mode is forcibly exited, and the previous
screen is displayed. (However, the service mode is not forcibly terminated if the Updater screen has been accessed from
service mode.)
• When this function is enabled, all operations (operations from the Touch Panel or hardware keys) other than screen
brightness adjustment and operation on the Energy Saver key are disabled.
● Procedure for Enabling This Function
The procedure for enabling this function is shown below.
1. Use the Remote Operation Viewer to access the machine, and start service mode.
2. Press [LUI MASK], and check that the button is enabled (has turned light blue).
● Procedure for Disabling This Function
The procedure for disabling this function is shown below.
1. Perform one of the following operations.
• Access the service mode, press [LUI MASK], and check that the button is disabled (has turned gray).
8. Service Mode
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