OPERATIONS MANUAL – 5750440 – REVISION D
Electrical
C2
The system consists of three assemblies: the controller, which contains the Motorola 68332
microprocessor-based CPU board; the printhead/driver board assembly; and the 15VDC-power supply.
The external 15VDC-power supply supplies the system voltage. The 15VDC supplies power for the
printhead solenoid drive, the ink pressure sensor circuitry, and the optional external photosensor. A
switching regulator on the CPU board supplies the 5VDC logic voltage. A battery monitor circuit supplies
battery voltage to memory when the 5VDC supply falls below the battery voltage level.
Printhead solenoids are energized by FETs (field-effect transistors) located on the driver board. The
FETS are driven by processor TPU (time processing unit) lines, which allow independent pulse-width
settings through firmware control. Product detection is achieved by either external or printhead
photosensors through firmware selection. The printhead photosensors or a preset by firmware control
determines product speed and direction. Phase-lock loop circuits at 10kHz and 12kHz operate the
printhead photosensors and prevent false triggering.
The CPU board has 256k of battery backed up RAM for message and configuration data. EPROMS
located in the U3 and U4 positions contain the firmware.
A differential pressure sensor located in the printhead housing reads the printhead pressure and
triggers the low ink alarm when the ink pressure falls below the usable level. Printhead pressure can be
read at the driver board TP3 at 1V/PSI.
The controller LCD display defaults to one line all black characters, and is configured for two-line mode
and cleared during the system boot-up process.
Содержание 5750-440
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