Service manual

3 • Theory Of Operation
3-38 DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
Figure 3-39 Print Head Contacts
Figure 3-40 Purge Unit Junction Board
Figure 3-38 Location of Print Head
Controller (Carriage) Board
NOTE: These
contacts
MUST be free
of ink
contamination
3.6 Electronics
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.