Fujitsu DL7400 Maintenance Manual page 16

(3) Lower cover
AC inlet
Reactor
(only 100-120v)
AC inlet
a. Lower cover
The Lower cover supports the printer mechanism and electric units as follows.
b. ROM board (control board with flash ROM)
The ROM board controls the host interface, control panel, and printing mechanism using an MPU and an
LSI circuit. Memory holds the resident character patterns and firmware, including resident emulation programs.
This board also has drivers and receivers for other components. The sensor receivers convert signals from the
sensors. The drivers supply power to motors, print head wires, and other components. The separate RS-232C
serial board or LAN relay board is connected to this board through the cable.
c. Power supply unit
The power supply unit supplies DC34V and DC5V by one transformer.
d. AC inlet and AC switch.
The AC inlet has protective earth cable. In order to prevent an electric shock, it must be fixed to frame ground.
The AC switch has cables to connect the Power supply unit and AC inlet.
e. CSF connector (front CSF)
The connector board for the front CSF is mounted at the front right of the lower over.
Power supply unit
Lower cover
Figure 1.7 Electric components of DL7400
16
ROM board
CSF connector