Print Head And Carriage Board - Pitney Bowes DM300c Service Manual

3 • Theory Of Operation
3.5 Ink System
3-24
Ink Cartridge (cont'd)
Ink Tank Expiration Notice—Ink tank will expire in XX days. This is based on
the date of manufacture and the number of days of use.
Low Ink. Remaining ink is less than needed to print 500 indicia.
No Ink Tank Detected—System failed to detect ink tank. System will run in
seal-only mode.
Ink Tank Expired—Install new ink tank (based on the date of manufacture).
Ink Tank Access Cover Open—Close cover or replace ink cartridge/print head.

Print Head and Carriage Board

Print Head. The print head is a bubble jet device with 616 nozzles (600
used) that prints postal indicia. The printed image is 25.4mm high (perpen-
dicular to transport motion) with a maximum print length of 180mm. Resolu-
tion is 300h x 600v dpi.
The secure print head and
driver electronics are inte-
grated in the print head as-
sembly. This is mounted on
the print head carriage and,
like the ink cartridge, is easily
replaceable by the user.
The print head, in conjunc-
tion with the secure carriage
board, ensures that the
printer in this closed-system
postage meter is dedicated to
printing only postage or other
meter-related information.
The carriage board receives
encrypted print data from the
PSD. It decrypts the data and
sends it to the print head.
The carriage board is sealed
within the carriage assembly
to provide a high degree of
security. Security is further
enhanced by the following:
• The print head is unique
to the DM300/400c. It is
not an off-the-shelf item.
• The print head does not
use a standard connec-
tion mechanism.
Figure 3-22 Print Head —Bottom View
Figure 3-23 Print Head — Contact View
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)