Oki C7400n Service Manual page 151

(B)
• Are there problems in the gears (the gear Assys of the I/Ds, multipurpose tray, belt unit
or belt motor)?
Yes Replace the damaged gear Assy(s).
• No Connect the LED head unit(s) to the junction board properly.
No
• Yes Replace the LED head Assy(s) after checking the cable connection.
Has the problem been corrected?
Yes End
• No Replace the junction board after checking the cable connection.
Has the problem been corrected?
Yes End
• No Is the engine board (71K PWB) connected to the junction board (Y71 PWB) properly?
No
• Yes Replace the EEPROM on the engine board after checking the cable connection.
Has the problem been corrected?
Yes End
• No Replace the engine board. Has the problem been corrected?
Yes End
• No Are the I/D terminals connected to the contact Assy properly? (See Figure 6-3.)
No
• Yes Replace the I/D unit(s).
Notes: 1. When replacing the engine board (71K PWB), demount the EEPROM from the board and
mount it on a new board.
2. When the EEPROM is not replaced, see Section 4.2.2.
41316401TH Rev.4
Connect the boards correctly.
Connect the engine board to the junction board properly.
Connect the I/D terminal(s) to the contact Assy properly.
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