Equipment Description
31
Haemonetics
®
ACP-215
®
Service Manual
P/N: SM-ACP215-01-EN(AB)
Card Cage
The card cage houses many of the printed circuit cards, including the
backplane card, the CPU card, the driver card, the add valve card, and the
centrifuge distribution card. Circuit descriptions are omitted here, but are
covered later as the individual circuits are encountered when describing the
device components.
CPU PCB
The CPU PCB is an Intel 80C188 microprocessor–based computer. The
internal structure of the processor consists of a 16-bit bus and execution unit
with various on-board peripherals, including an interrupt controller, three
timers, a clock generator, and I/O and memory chip select logic.
The processor has an 8-bit external bus that is buffered before connecting to
any of the on-board devices. This bus, along with the de-multiplexed address
bus, are buffered and configured to the IBM PC bus standard for backplane
board-to-board communications. A smaller buffered parallel bus drives the
display and keyboard.
The card houses a custom EPROM which contains the operating system.
When a program change occurs, this IC is generally what needs to be replaced.
The card also houses several PAL ICs, the nonvolatile RAM (NVRAM) IC along
with its write protect switch.
Driver Board
The main function of the driver PCB is to interface the CPU card to the following
system components:
Pump motors
Pinch valves
Compressor
Centrifuge interface
Commands written from the CPU are processed on the driver PCB, and the
above components are driven by the circuitry contained on the card. The card
also serves as an interface between the feedback signals of the pump, valve,
and relay systems to the CPU.
Add Valve PCB
The add valve card controls four additional valves. Only three of the four are
utilized. The valve drive and position feedback circuitry are identical to the drive
PCB electronics. The add valve card communicates to the CPU through the
backplane PCB and a ribbon cable between the backplane card and the add-
valve PCB.
