Service manual

3 • Theory Of Operation
3-34 DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
3C00/4C00/5C00 Controller Main Logic Board. This board contains all the
components that provide the computing resources for the mailing machine,
among them the CPU, flash memory, DRAM, BBRAM and a host of other
components that provide drives to all motors and sensors, and support for
the PSD/iButton hardware.
Figure 3-35 B Controller (Main Logic) Board NOTE: Boards may vary; some connectors are not used
J120 Purge Unit
J127 Print Head J130B Keyboard J130 Keyboard
J116 Purge Unit
J117 Tape Motor
J125 PS
J126 PS
PSD
MODEM
J101
J123
J103 J118 Carriage Motor
J107 Serial Port J119 Sensor Board J121 Top Cov Intlk J122 Encoder Sensor
J115
Transport
Motor
J128
NVRAM
Battery
under
Modem
Card
LEDs 1701, 1702
3.6 Electronics
PCBs (cont’d)