Pitney Bowes DM300c Service Manual page 68

3 • Theory Of Operation
3.6 Electronics
3-38
PCBs (cont'd)
Purge Unit. This PCB provides connections from the carriage home sensor,
pump sensor and cap sensor. It serves solely as a junction board and there-
fore has no active components on it. The purge PCB also routes the 5V
required for the sensors from the main logic board. It connects to the main
logic board through J120.
Figure 3-38 Location of Print Head
Controller (Carriage) Board
Figure 3-40 Purge Unit Junction Board
NOTE: These
contacts
MUST be free
of ink
contamination
Figure 3-39 Print Head Contacts
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)