USA MAV500/MKVI Service Manual
Ticket Printer
28-00486-00
17-7
This document contains confidential information which is proprietary to ATI. It may not be disclosed to any unauthorized parties,
and it may not be copied. All rights reserved.
© Copyright (ATI) Aristocrat Technologies, Inc. 2002.
The printing process is achieved by the print head needles striking the inked ribbon
and leaving corresponding dots on the paper. Printed characters are formed by
combinations of print head needles, the activation of the needles is controlled by the
printer electronics.
Each complete movement (left to right or right to left) of the print head constitutes a
print cycle (a printed line). To complete a print cycle the drive shaft rotates four
times and the encoder gear rotates 24 times (geared 6:1 reduction ratio between motor
and drive shaft). Thus, each print cycle contains a fixed number of encoder pulses, a
print head needle can be energised on every other encoder pulse. A print cycle
includes the actual printing time and the time needed to change the direction of the
print head movement.
Paper is friction fed from one printed line to the next by the feed roller. The feed
roller is controlled by a pawl and solenoid mechanism which activates the feed roller
once for each revolution of the drive shaft by a cam on the drive shaft.
Ribbon advancement is controlled by the ribbon feed assembly which is driven off
the same cam as the line feed mechanism.
The bail cuts off the receipt from the paper roll. It is activated by reversing the motor
drive direction and energising a solenoid (cutter lockout solenoid). A lever
arrangement driven by a drive shaft cam operates the blade mechanism to cut the
paper. When the motor drive direction is reversed again, the blade mechanism is
retracted and normal printing operations can resume.
Note
The paper cutting mechanism is designed to cut
single ply paper only.
The take up unit consists of a separate chassis which is secured to the printer chassis.
The take up unit has a paper handler for mounting the journal ply of the paper roll and
provides an electric motor, shaft, gear train and clutch assembly for the journal paper,
the Cut/Feed switch is also mounted to the take up unit. The motor runs faster than
actually required to spool the journal, the clutch providing slippage to keep the
tension of the journal spool constant regardless of the diameter of the spool. The
motor is driven by the electronic controller PCB.
The following diagram provides examples of cash, audit meter and test printouts. The
information printed on the tickets may vary somewhat between machines due to
customer and gaming authority requirements.