Ricoh DD5450 Field Service Manual page 175

● Removing the Main PCB unit
2. Disconnect the connectors. (13 places)
REFERENCE
● When the FS-100U2 (option) is installed, remove the
two screws to remove the USB PCB unit.
(Pan head screw with plain washer 3 x 6)
● Disconnect the two connectors, CN20 and CN21.
3. Remove the six screws to remove the main PCB unit
(old).
(Pan head screw with spring plain washer 3 x 6)
4. When a EEPROM is mounted on the new main PCB
unit, remove it.
5. Remove the EEPROM on the main PCB unit (old)
and mount it on the new main PCB unit.
IMPORTANT
● Fit the cut out to the mark on the PCB unit when
mounting the EEPROM.
Reinstallation
● Installing the Main PCB unit
1. Install the new PCB unit.
2. Connect the 13 connectors. (13 places)
REFERENCE
● When the FS-100U2 (option) is installed, install the
USB PCB unit with the two screws.
(Pan head screw with plain washer 3 x 6)
● Connect the CN20 and CN21. Make sure not to
mistake CN1 for CN21.
3. Turn on the power and make sure that "EEPROM
error" does not appear on the LCD panel.
4. Make sure that master making and printing are
performed correctly.
IMPORTANT
● Carefully release the lock when disconnecting
the flat cable. Failure to do so may damage the
PCB unit.
IMPORTANT
● Connect the flat cable with the terminal surface
down.
Chapter 4
Main PCB unit
Flat
cable
USB PCB unit
Recommended
● Carefully release the lock while
holding it between your fingers
as shown in the above figure.
Incorrect
● If you release the lock as
shown in the above figure,
it opens sharply and may
damage the connector.
Exterior
1
Cut out
４
173