Service manual

Avantra 36/44 Service Manual
2-8 Functional Analysis
Figure 2-2 OCP to DEC to sensor/motor/servo flowchart.
Commands received at the DEC’s u-controller direct operations to a code segment.
The code segments can be a high level operation such as a supply cut. The code
segments also can be smaller elements that combine to produce a higher operation.
Providing small command segments adds to the system flexibility in undefined vol-
atile areas. Accessing only stable code reduces the likelihood of the DEC’s u-con-
troller program memory requiring updating, which has been the case in the media
handling area. Updating program memory requires reprogramming the FLASHROM.
The DEC is subdivided into the following submodules:
• Synchronous serial interface (SPI)
• Image control
• Asynchronous serial interface (on-line processor)
• System sensor, 5 x 6 matrix submodule
• Driver selection
2.5 Operator Control Panel
The operator control panel module (OCP) is the system task master. The OCP,
implemented with a micro-controller, gathers both APIS commands from a RIP and
user commands from the keyboard. Commands are parsed and then either
processed directly by the OCP module or sent along to the appropriate micro-
controller for processing via the SPI communication link.
Buffer
and
Control
APIS Data
Laser
Driver
Engine Micro-
Controller
Servo Micro-
Controller
(D.S.P.)
Diagnostics
Micro-
Controller
OCP
APIS Commands
User Commands
Modem Interface
Position Sensors
Safety Sensors
Media Sensors
On Line Processor
DC Motors
Solenoids
Stepper Motors
Spinner Servo
Media Feed Servo
Carriage Servo