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Part 4: Technical Reference
3.1.1 Mechanical system configuration
1) BJ cartridge/ink tank
Three types of BJ cartridges can be used on the printer: Black BJ cartridge BC-80,
Color BJ cartridge BC-81 and Photo BJ cartridge BC-82 Photo. The ink tanks of
each of these BJ cartridges can be removed from the BJ cartridge for replacement.
The user can selectively use the following two combinations of BJ cartridges to suit
his or her particular printing requirements:
Combination 1: Black BJ cartridge BC-80 and Color BJ cartridge BC-81
Combination 2: Photo BJ cartridge BC-82 Photo and Color BJ cartridge BC-81
In combination 1, Black BJ cartridge BC-80 is installed in the left slot, and Color BJ
cartridge BC-81 is installed in the right slot. In combination 2, Photo BJ cartridge
BC-82 Photo is installed in the left slot, and Color BJ cartridge BC-81 is installed in
the right slot. Though Color BJ cartridge BC-81 can be installed in the left slot, be
sure to install it in the carriage's right slot.
2) Purge unit
Driven by the purge motor, the purge unit helps maintain high-quality printing by
wiping the print head face plate of the BJ cartridge and capping the BJ cartridges'
nozzles. This unit ensures that the ink in the nozzles is ejected easily during printing.
The purge unit is comprised of the pump section and wiper section.
The pump section sucks ink from inside the BJ cartridges and removes ink inside
the cap. The wiper section wipes the print head face plate of the BJ cartridge.
When the printer is not in use, the purge unit caps the BJ cartridges' nozzles for
protection.
3) Carriage unit
The carriage is moved horizontally backwards and forwards by the carriage motor
and the drive belt. The print signals sent from the logic board are transferred to the
two BJ cartridges on the carriage through the ribbon cable.
4) Sheet feeder unit/paper feed section
The built-in sheet feeder is driven by the purge motor to feed printing paper stacked
in the sheet feeder up to the paper feed section.
Driven by the paper feed motor, the paper feed section rotates the paper feed roller
to move the printing paper in the vertical direction.
5) Paper eject section
Paper feed motor power is transferred to the flappers by the flapper drive gear of the
flapper unit engaging the relay gear of the eject roller. The flappers open and close
each time printing of a single sheet is completed, and feed the printing paper to the
flapper unit.
This prevents just printed paper from being ejected on top of the previously printed
paper before the ink on the previously printed paper has dried.
6) Manual feed slot
Paper can be fed manually from the manual feed slot on the rear of the printer. Manual
feed takes precedence, even if printing paper is stacked in the sheet feeder unit.
7) Upper cassette/lower cassette unit
The gear in each cassette transfers drive from the purge motor to move the cassette
pick-up roller. This roller picks up and feeds the paper to the paper feed section.
4-16
BJC-8500
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