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DocuPrint 900/1300 User’s Guide
System Components: Basic Operation and Control
2
The major components of each print engine includes:
Printhead
Imaging drum
Pressure roller
Toning system
Cleaning system
Erase rod
Front View of the Printer Engine 2
Printhead
Printhead
locking lever
Pressure
roller
Toner
Toner
Engine
card cage
Image drum
Base plate
assembly
Web
Erase rod
assembly
canister
Duplex Printer Cabinet
DocuPrint 900/1300 User’s Guide
2-7
Printhead
During operation, the printhead generates and controls a stream of ions
(electrically charged atom or group of atoms) to form a negatively charged
electrostatic image on the surface of an imaging drum. Ion patterns are
produced by applying high voltage to the printhead electrodes. The
application of high voltage is varied by electronics in the ion deposition
engine to produce the desired latent image.
The printhead is constructed of multiple electrodes and insulating layers
mounted on a 22.9 inch by 2.32 by 1.97 inch (583 mm x 59 mm x 50 mm)
aluminum channel. The aluminum channel functions as a supporting structure
and heat sink.
The removable printhead handle allows the printhead to be
used for either print engine 1 or 2. For print engine 1, a
printhead with a single-dot spacer at the end is inserted into
the print engine first. For print engine 2, a printhead with a
double-dot spacer end is inserted into the print engine first.
The above illustration depicts a printhead setup for print
engine 1.
The printhead is inserted in the printhead mounting assembly with the
electrode contacts on both sides. It is pushed against a stop and secured with
the printhead locking lever. This lever controls application of all voltages to
the driver electronics, printhead, erase unit, and engine support card cage. In
the locked position, all voltage is turned on at the power supply source.
Rotating the lever to the unlocked position causes all voltages to be turned off.
The printhead should be cleaned regularly. Always keep the holes in the
screen unclogged and free of toner dust.
The printhead is heated by a heater located in the printhead mounting
assembly. The heater prevents moisture absorption, which could lead to
screen contamination, degrading the quality of the printed page. A
temperature controller in the AC box at the rear of the print engine regulates
the temperature of the printhead. The temperature should always be left at
100
°
F (38
°
C).
The printhead heater is connected to a power source that is independent from
the main system power source, so the heater will remain energized when the
printing system is off. Removing power from the printhead heater will require
a 2–3 hour warm-up period prior to use.
Handle
Aluminum base
Double-dot
spacer
Single-dot
spacer
Note
Unlock
Lock
Printhead Locking Lever
Temperature Controller
