DESCRIPTION
2-18 20509 Issue 7 Jan 2018
Universal Serial Interface PCB
The Universal Serial Interface PCB contains a microprocessor which
controls both data input and printing routines. It receives input data in the
form of serial characters and control codes, and converts it into dot matrix
patterns for output to the Solenoid Driver PCB. Characters to be printed
are converted into dot matrix form by character set look up tables
contained in Electronically Programmable Read Only Memories (EPROMs).
Print commands such as bold or reversed are stored in the Random Access
Memories (RAM) along with the dot matrix for that character.
The Universal Serial Interface PCB contains circuits for the RS232 interface,
real time clock, stroke generator, product detector inputs and printed stroke
output. When Macrojet 2 is powered down, a battery backup automatically
maintains the RAM and clock in standby.
This PCB has links and switches that need to be set up to match the printer
system and application (see
page 4-31 and page A-8).
Solenoid Driver PCB
This PCB accepts parallel dot matrix information and amplifies it into
signals suitable to drive the print head solenoids. Each solenoid driver PCB
can drive up to sixteen solenoids. The PCB is arranged as two identical
channels of eight lines. The channels can run independently and drive one
or two 7 drop heads. Alternatively, the two channels can drive one 16 drop
head. Selector links allow one intensity control to govern all sixteen
nozzles. Data is input to the board in 8-bit patterns. With a 16 drop head,
the first 8- bit pattern controls the upper eight nozzles.
Low Voltage Power Supply PCB
This PCB assembly provides the +5V, +12V regulated and +10V
unregulated supplies to the electronics system. The +5V supply powers all
the logic and microprocessor circuits. The +12V supply is used to power
the RS232 circuits, the stroke generator, product detector and the shaft
encoder. The +10V unregulated supply is used to charge the Universal
Serial Interface PCB battery. It is also used to power the power fail detect
circuit which detects the onset of a power failure.
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