Adjustments After Parts Replacement; Precautions In Replacing Engine Controller Board; Precautions In Replacing Eeprom - Oki C7400 Maintenance Manual

3.2

Adjustments after Parts Replacement

Adjustment to be implemented after each part replacement is described below.
Adjustment and correction of color registration are always required for each part replacement.
Replaced Part
LED Head
Drum Cartridge (Y, M, C, K)
Fuser Unit
Belt Cassette Assy
PU (K71 Board)
CU (SWA Board)
* Note: When the EEPROM of the PU (K71 Board) is replaced to a new one, color balance must be
adjusted.
3.2.1

Precautions in replacing engine controller board

When replacing the engine controller board (71K PWB), demount the EEPROM from the board and
mount it on a new board (for errors other than those of engine EEPROM).
When the "SERVICE CALL XX" (an engine EEPROM error) message is displayed on the operator
panel, the EEPROM must be replaced with new one. In this case, perform the operation described
in Section 3.2.2.
3.2.2

Precautions in replacing EEPROM

When the EEPROM is not demounted from the board and not mounted on new one at the time of
engine controller board (71K PWB) replacement, or when the EEPROM is replaced with new one,
the version read (fuse cut) function is disabled. The printer must be switched from the factory mode
to the shipping mode using the following setting procedure:
Changing the setting using operator panel
1. Remove the main controller board.
2. While holding the 1 1 1 1 1 and 5 5 5 5 5 keys down, turn the power on to enter the engine maintenance
mode (level 1).
3. With "ENGINE DIAG MODE XX.XX" on the display, press the 2 2 2 2 2 and 4 4 4 4 4 keys to enter the engine
maintenance mode (level 3).
4. Press the 1 1 1 1 1 and 5 5 5 5 5 keys until "LOCAL PARAMETER SET" appears on the upper display.
5. Press the 2 2 2 2 2 and 6 6 6 6 6 keys until "FACTORY WORKING MODE" appears.
6. While "FACTORY WORKING MODE" is being displayed, use the 3 3 3 3 3 and 7 7 7 7 7 keys to select a
setting value.
7. Select "SHIPPING MODE" (fuse cut enabled), press the 3 3 3 3 3 and 7 7 7 7 7 keys in combination. Then,
the mode name stops blinking and the set value is registered.
41316401TH Rev.9
Adjustment
Color balance adjustment
Not required.
Not required.
Not required.
Re-mounting the EEPROM used prior to the replacement *Note
Re-mounting the EEPROM used prior to the replacement *Note
Oki Data CONFIDENTIAL
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