SCAMAX
®
2600/4000
Tech. Manual 06/2002
T-37
3.8.2 Photocell
The photocell is a photoelectric reflection sensor that is built into the paper transport path. It is housed
within a rectangular cutout in the guide plate. The senor recognises the leading edge of the document
and initiates the print process after an appropriate delay.
The engagement of the clutch at the start of a scan process causes the print head to drive into the print
position. If no printing takes place for a given period of time (usually 1 min.) the print head drives into the
standby position and the jets are covered.
3.8.3 Processor Board
The processor board translates the text information transferred to it by the controller via the serial
interface into a pixel pattern and controls the individual jets of the inkjet cartridge during the print process.
Once the specific settings have been transmitted to the endorser and it is activated it works asynchronous
to the scanner control of the controller board. This means each document that passes the photocell will
be printed on. This principle of operation applies to both regular documents as well as double feeds
and/or oversized documents. The sequence number is automatically increased after each print cycle,
regardless of the status of the scanner controller. A real-time clock with battery back up supplies date and
time information.
The power supply unit supplies the +5V current for the processor and logic. Current for the print head
(+12V) and for the jet control (+38V) is supplied by the I/O-Board. This board also carries the serial
interface to the controller.
A LED indicates the status of the photo cell that initiates printing.
The controller ensures that the processor board adjusts printing to the various paper transport speeds
depending on the resolution selected. This means adjusting the timing of the print delay (travel time from
photo cell to print head) and the print density (time between two pixel lines).
A small operator panel on the processor board allows certain settings to be made manually by using three
buttons and the LED display. It is only necessary to make an adjustment here when changing print fonts.
Summary of Contents for SCAMAX 2600
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