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This OSC clock is then used by both LSI chips (ME16 and ME25) for
internal timing, and is inverted by ME20-6 to generate OSCXT. Signal
OSCXT goes to the printer interface connector and if an optional interface
is used, it also goes to this optional interface board (e.g., RS232 Serial
Interface) .
4.3 INITIALIZING THE PRINTER
Before the printer can accept input data, it must first be PRIME1d
and SELECT1ed. The prime operation initializes the printer logic to a
ready state. The select operation after causing a prime condition, (which
can be disabled by jumper E14-E15), resets the busy line to the interface
connector and makes the printer ready to receive data.
4.3.1 PRIME
The PRIME signal, generated on LSI chip ME16-37, is generated by
any of the following conditions:
d.
Power Turn-on - When the printer is turned on, capacitor
C10 is initially discharged causing a low 100-500 msec
PWRPRM signal into ME16-32. This generates a high PRIME
signal at ME16-37. As C10 charges to +5V, PWRPRM goes
high terminating the power prime operation.
b.
Printer
Selecti~n
- If the Delete Inhibit option (DELINH)
is not used (i.e., jumper E13 to E14 is connected), then
a
low
SLCT input to ME16-40 and a high Q.ELINH to ME16-39 generates
a 100-400 usec PRIME pulse at ME16-37.
c.
End of a Printed Line - At the end of a line of print,
CIPX at ME16-30 goes high, turning off the forward clutch
and generating a 100-400 usec PRIME pulse at LSI chip
ME16-37.
4-3
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