Model 750
Series 700
Maintenance Manual
Page 14
Rev H
Operator Interface:
Pressing the Test Switch will reset the Printer Control Board. The LED will go off when
the Test Switch is pressed. The Test Switch, along with the Ticket Feed Switch, may be
used to test the printer. The test mode is enabled by the following operations: Hold the
Test Switch down and then simultaneously hold the Ticket Feed Switch down. Release
the Test Switch and then release the Ticket Feed switch. The printer will print a test
ticket. Reset the printer before returning to the normal print mode. The Ticket Feed
switch, when pressed, will feed one ticket through the printer. The LED will blink
when there is no ticket in the printer.
CPU:
The CPU controls all of the printer functions. The CPU reads the printer configuration
from the EEROM. The CPU contains a UART and communicates with the host machine
through a serial link. The CPU controls the printer stepper motor. The CPU uses the
Black Dot Sensor information to feed the ticket properly. The CPU drives the print data
into the print head and controls the print head timing. The CPU uses the A/D converter
to ensure that the print head is driven properly; this function increases the print head life
and reliability.
Sensor Interface:
The Ticket Low Sensor interfaces to the Printer Control Board via connector J8. The
(optional) Ticket Present Sensor interfaces to the Printer Control Board via connector J7.
Print Head Interface:
The Print Head data and power are driven to the Print Head via connector J3.
The stepper motor phases are driven via connector J5. The Black Dot Sensor
interfaces to the Printer Control Board via connector J6.
A/D Converter:
The A/D converter measures the following:
•
Print Head Temperature
•
Print Head Voltage
•
+24 Volt Supply Voltage
•
Stepper Motor Current
The CPU uses the A/D Converter information to optimize the print head drive levels.
