Oki C7500n Maintenance Manual page 130

4
Solid lines or streaks appear in the vertical direction. (Black lines, color lines / black streaks, color
streaks) (Fig. 5-2 D )
• Is the LED head assembly connected properly to the connection board (Y73 PWB)?
NO Connect the LED head assembly to the connection board properly.
M •
YES Check the cable connections, then replace the LED head assembly. Did the printer recover?
YES End.
M
• YES Check the cable connections, then replace the connection board (Y73 PWB). Did the printer
recover?
YES End
M •
NO Is the engine board (K7N/K7V PWB) connected properly to the connection board (Y73 PWB)?
NO Connected the engine board properly to the connection board.
M •
YES Check the cable connections, then replace the engine board (K7N/K7V PWB). Did the
printer recover?
YES End
M
• NO Is the I/D terminal connected properly to the contact assembly? (See Fig. 5-3)
NO Connect the I/D terminal properly to the contact assembly.
M •
YES Replace the image drum.
Note: 1. Remove EEPROM from the old board and set it on the new board upon replacing the
engine board (K7N PWB).
2. If EEPROM is not replaced, refer to section 3.2.2.
3. When replacing the engine board (K7V PWB), upload EEPROM data from the board and
then download it to a new board, using a life counter tool.
41955801TH Rev.8
Oki Data CONFIDENTIAL
130 /