Service manual

3 • Theory Of Operation
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
3-33
Figure 3-34 Power Supply PCB and Shield
Power Supply PCB. Sepa-
rate power supplies are used
for the DM300c, DM400c,
and DM475. This is due to
the greater power require-
ments imposed by the feeder
motor/drives on the higher
model units.
Board Characteristics
Type: Switching
Input: Universal (100-240V)
Output:
27V (to feeder, trans- port
motor, and print head)
5V (to control panel, main logic)
Wattage:
Peak 80W ( DM300c) 140W (DM400c)
Standby 8W 10 W
The power supply is connected to the main logic board through two connec-
tors. Connector J125 has all the voltage lines, whereas connector J126 has
all the control lines used for turning the motor and heater voltage on and
off. Connector J126 is also used for the detection of the power supply type
to ensure that DM400c units are fitted with the higher voltage power supply
units.
PCBs
Control Panel Unit. The con-
trol panel includes a multi-line
character display, main con-
trol keyboard and QWERTY
keyboard for data entry. Un-
like some previous models
in the DM Series, the feature
memory, control and PSD do
not reside on this board; they
reside instead on the main
logic board.
The keyboard/display unit is connected to the main logic board at J124 and
J120.
Figure 3-33 User Interface PCB
3.6 Electronics