I/O Driver Board
USA MAV500/MKVI Service Manual
11-12
28-00486-00
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 hard meters are the 24 V DC type and use the same type driver that is used for
the pushbutton lamps. Animation lamps and light tower lamps are driven in the same
manner. There is provision for up to three animation lamps and four light tower
lamps.
11.2.9 Expansion I/O
As well as providing for the I/O in Table 1, the system includes additional I/O for
possible future use. Of the 16 pushbutton lamp driver outputs (as discussed in section
11.2.3
Pushbuttons), two 24 V DC driver outputs are specified as expansion
outputs. Similarly, two pushbutton switch type inputs are specified as expansion
inputs.
At least six expansion TTL I/Os are included. The TTL I/O lines are filtered to
prevent external noise entering the board via these lines.
11.2.10 Door Security
The I/O Driver Board incorporates a battery-backed circuit for monitoring door
security even while the machine is not powered. This circuit indicates to the system
software that the door has been opened. Logic for 4 battery-backed door security
switches is provided, and a typical allocation is shown in the table below:
Door
Signal Label
Main Door
GDOR
Logic Cage Door
LDOR
Belly Panel Door
SEC
Cash Box Door
DDOR.
11.2.11 Power
The I/O Driver Board receives 24 V DC and 12 V DC isolated from the Power
Supply Assembly.
The 24 V DC supply is converted on-board to provide a regulated 12 V DC
±
5%
supply to the coin comparator and a 5 V DC (VCC) supply to power the Main Board
logic. VCC is also supplied to any peripheral logic circuits requiring 5 V DC.
A separate step-down DC/DC regulator on the I/O Driver Board is used to convert the
isolated 12 V DC supply to the 5 V DC isolated required for the Mikohn interface.
