Oki C7500n Maintenance Manual page 137

(B)
• [Yellow/Magenta/Cyan Left/Right/Horizontal] display
M
• YES Replace the belt unit. Did the printer recover?
YES End.
M
• NO Replace the ID unit. Did the printer recover?
YES End.
M
• NO Is the gear abnormal? (Gear assembly such as I/D, multipurpose tray, belt unit, belt motor.)
YES Replace the damaged gear assembly.
M
• NO Is the LED head unit connected to the connection board (Y73 PWB) properly?
NO Connect the LED head unit to the connection board properly.
M
• YES Check the cable connections, then replace the LED head assembly. Did the printer recover?
YES End.
M
• NO 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 to the connection board (Y73 PWB) properly?
NO Connect the engine to the connection board properly.
M
• NO Replace the engine board. Did the printer recover?
YES End.
M
• NO Is the I/D terminal connected to the contact assembly properly? (See Fig. 5-3)
NO Connect the I/D terminal to the contact assembly properly.
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 maintenance utility.
41955801TH Rev.8
Oki Data CONFIDENTIAL
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