Scalar 218
Theory of Operation
adic
Service Procedure
63-1181-01 Rev A
6
Operator Panel
The
Operator Panel
includes an eight-key keypad and a 4-line by 20-character scrollable LCD display.
The keypad and display provide a means for the operator to change operating parameters of the 218, such
as the SCSI ID of the robotics. Additionally, an Off-Line Diagnostics Menu is available via the
Operator
Panel
, through which a qualified technician can examine error, event, and operation logs, perform manual
pick and place operations, and calibrate the location of the
Media Picker
. The
Operator Panel
interfaces to the Controller PCB.
Cartridge Sensors
Mounted beneath each of the 18 cartridge storage slots, the
Cartridge Sensors
monitor cartridge
presence. The contents of the 218 (inventory) can quickly be determined by polling these sensors.
Door Open Sensor
The sliding access door open sensor alerts the
Motion Processor
of the door's position (opened or
closed). If the door is opened during On-Line Mode operation, a SCSI UNIT ATTENTION message is
sent to the host. It is up to the software application running on the host to handle this condition with the
proper routine. If the door is opened while the 218 is performing a pick and place operation, the
Motion
Processor
automatically causes all
Media Picker
motion to stop.
Drive Assembly Section
One or two drive assemblies may be mounted in the
Drive Assembly Section
. The drive assemblies
respond to operating commands, and communicate directly with the host computer’s SCSI channel. Each
drive assembly receives operating voltages from the
Power Supply Section
of the 218. The only other
interface between an assembly and the 218 is the drive assembly multiplexer (Mux) card. The 218
monitors the drive assembly status through the Drive Mux Bus (see
Door Open Stepper
Motors
).
Power Supply Section
The
Power Supply Section
contains 2 separate power supplies.
80 watt Switching Supply
The 80 watt switching supply is mounted in the
Power Supply Section
. It provides the operating voltages
for DLT drives 1 and 2.
50 watt Switching Supply
The 50 watt switching supply, mounted in the
Power Supply Section
, provides operating voltages to the
remainder of the 218.
