OKI C841dn

Entering self-diagnostic mode (level 1)

Note: Entering the System Maintenance mode requires a password: 000000

1. Turn on the printer while using the MENU▲ , MENU▼ button and HELP button combination to enter the System Maintenance mode.
2. Press the MENU▲ or MENU▼ button more than one time to display “Diagnostic Mode”. Then press the ENTER button to display “DIAGNOSTIC MODE”.
3. XX.XX.XX on the LCD display identifies the PU firmware version. The FACTORY WORKING MODE setting is displayed in the right portion of the lower row. The setting is normally S-MODE, which identifies Shipping.

Exiting self-diagnostic mode

1. Turn of the printer and, after ten seconds, turn it on.

The normal self-diagnostic mode menus are as follows:

No	Option	Self-diagnosis Menu	Adjustment
1	Switch scan test	SWITCH SCAN	Checks input sensor and switch
2	Motor clutch test	MOTOR&CLTCH TEST	Tests the operation of a motor or clutch.
3	Test printing	TEST PRINT	Prints a test pattern stored in the PU.
4	Color registration adjustment test	REG ADJUST TEST	Judges the color registration adjustment mechanism as pass or fail.
5	Density adjustment test	DENS ADJ TEST	Judges the density adjustment mechanism as pass or fail.
6	Consumable counter display	CONSUMABLE STATUS	Displays the usage of a consumable.
7	Consumable life counter display	PRINTER STATUS	Displays the life counter of a consumable.
8	Factory/Shipping mode switching	FACTORY MODE SET	Switches between Factory and Shipping modes
9	Fuse status display	FACTORY MODE SET	Displays the status of a fuse.
10	Engine parameter setting	SENSOR SETTING	Sets whether to enable or disable error detection performed by each sensor
11	Display of LED head serial number	LED HEAD DATA	Displays the serial number of LED head data.
12	NVRAM parameter setting	NVRAM PARAMETER	Must not be used.
13	Contrast adjustment	GRAPHIC PANEL ADJUST	Adjusts the contrast on the panel.
14	Buzzer test	BUZZER TEST	Buzzer sound test