Oki OKIPAGE 14EX Service Manual page 258

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The engine maintenance mode is activated when the power is turned ON while keeping the FORM FEED key and ENTER key pressed down.
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This mode adopts the menu for function selection.
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The method for exit from this mode depends on the setting.
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The engine maintenance mode provides the following functions:
(1) Head Drive Time Setting
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Sets the drive time of the LED head.
(2) 600 x 1200 DPI strobe time
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Do not change the default setting.
(3) Printing Start Position Setting
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Sets the printing start position.
(4) Drum Count Total Display
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Displays on the LCD the total number of drum revolutions of the unit, counted at the engine block.
(5) Drum Count Display
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Displays on the LCD the total number of EP drum revolutions counted at the engine block.
(6) Factory Adjustment (for High Capacity Second Paper Feeder/Power Envelope Feeder)
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Do not change the default settings since these are factory settings and were set at the factory.
(7) Engine Reset
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No items subjected to, all except counters are subjected to reset, as a common spec. (See Table 4-1).
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Engine maintenance mode menu system