Demo page/Configuration sheet function This button will have multiple functions when the printer is in idle state. 3) KEY input process Stop key input process : After the panel task is received the Stop key detection event, it checks the engine error status two times and process the operation to be defined by key value. If users input key value, the key input is transferred via GIP (General Input Port) and the operation to be defined by key value is processed.Ħ.2.1.1 Functions Stop key function is made up of - Demo page/Configuration sheet printing function - Job cancels function - Start manual feeding function - Firmware downloads mode function Black only key function is made up of - Change printer mode to Black-only mode function - Black only LED light functionĦ.2.1.2 Detail Description KEY input detection & process order 1) User KEY input 2) KEY input detection : If the key input is detected when the key input check per timer tick 10ms, The 10ms interrupt service routine sends the key detection event to panel task. The one is Stop key and the other is Black only key. If user input key value, the operation to be defined by key value is processed and the LED operation to be defined by printer status is controlled. User interface (panel) is made up of - KEY input detection & process - LED control The initial process to use the panel checks register°Шs values of key and LED. KEY (2 key): Stop key, Black only key LED (6 LEDs): 4 LED for CMYK toners : toner-low(cyan, magenta, yellow, black) LEDs 1 LED for status : ready (green) or error(red) status LED (two color LED) 1 LED for Black only: If Black only key is pressed, Black only led glows. The `User Interface' module handles the processing of the `Key Press' and `Led control' at different states of the machine. The CLP-300 printers have 2 keys and 6 LEDs. On the contrary to other models of color printers, they show the status of the printer only with their LEDs.

The CLP-300 printers do not have LCD panel which is used in other color model printers.

Much of this chapter is also included in the user's guide. This chapter describes some of the main service procedures including: Using the EDC mode Clearing paper jam and test patterns.

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