PRINTER DESCRIPTION
6--12 27080 Issue 1 September 98
ELECTRONICS SYSTEM
Alloperator control,maintenanceandfaultreportingiscarriedoutvia
thefrontpanelincommunication withtheelectronicssystemshownin
the diagram opposite.
The electronics system is centred on the Control Printed CircuitBoard
(PCB)Assembly,consistingofthe PrinterSupervisor,StrokeGenerator
and Print Engine Controller. The assembly is fitted into the upper
compartment of the cabinet. Each PCB has its own microprocessor,
battery--backed SRAM for data storage and FLASH memory for main
code storage.
CAUTION Forallmaintenanceandrepairpurposes,theControl
PCB Assembly must be treated as a singleassembly.
Under no circumstances must the Control PCB
Assembly be split.
Connections between the ControlPCB Assembly and all other partsof
theprinterarebydirectconnectionorbywayofthreeperipheralPCB’s
--theFrontPanelInterface,ExternalInterface,andInkSystemInterface
PCB’s.
The Front Panel Interface PCB is principally concerned with scanning
the front panel keys, driving the light emitting diodes (LEDs) and
interfacing with the liquid crystal display module showing the screen
information.
The External Interface PCB interfaces between the Control PCB
Assemblyandthelowvoltagelevelproductdetectorandshaftencoder
signals. It also provides buffers between the Control PCB Assembly
electronicsandthehighvoltagesusedinthe beaconandalarmcircuits.
Small optional PCBs can be mounted on the External Interface PCB to
provide, for example, RS232 or RS485 communications interfaces for
the printer communications port, or a separate User Port.
TheInkSystemInterfacePCBdistributesthefunctionsprovidedbythe
ink system output port of the Control PCB Assembly. It also provides
theprotectiveinterface betweenthefluidlevelsensorsandtheControl
PCB Assembly electronics system.
Therearetwopower supplyunitsintheelectronicscompartment. The
unit mounted at the rear of the electronics compartment generates the
low level dc voltages required by the printer (+5V, +12V, +25V
nominal). Theunitmountedontheelectronicsinnerdoorgeneratesthe
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