Oki ES5112dn Maintenance Manual page 32

The case where the printer does not work normally after tuning on the power
• Turn off the power and then, turn on the power again.
• Are messages in the display of LCD all in black?
• No Is the AC cord properly connected?
• No
• Yes Is the cable to connect the main board with the
low-voltage power correctly connected?
• No
• Yes Is +5V supplied to the main board?
(Check with 7 pins and 8 pins of POWER connector)
• No
• Yes
• Yes Do Power switch LED stay off?
• Yes
Connect the AC cord.
Connect the cable.
Do+5V of the main board and
GND short out?
( C h e c k w i t h 7 p i n s a n d 8
p i n s of POWER c o n n e c to r)
No R e p l a c e t h e l o w -
voltage power.
Replace the main board.
Replace one of following : low
voltage power supply unit , main
board , power switch board , the
cable between the low voltage
power supply and main board ,
the cable between main board
and power switch board.
• No Do Power switch LED blinking rapidly?
• Yes Replace one of following : low voltage
power supply unit , main board , the cable
between the low voltage power supply
and main board.
• No The flexible cable of the operator panel Assy is
appropriately connected to the OPE connector of
the main board and Connector CN1.
• No Connect the flexible cable appropriately.
• Yes Replace the operator panel Assy or the flexible
cable.
• Has the problem been solved?
• No Replace the main board.
• Yes Completed
• Yes Is the message of "INITIALIZING" displayed on the LCD?
• No Replace the main board.
• Yes Is the message of "ONLINE" is displayed on the LCD?
• No Take action according to the LCD status
message / Trouble List. (Refer to the
Section 2.5.1 for how to take action.)
• Yes Completed.
2. Procedures for Repairing
2-16