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OPERATOR CONTROLS (Figure 13)
The
Power On Light
indicates when power is applied
to the printer control circuits.
The Ready Light
indicates that the printer has been
conditioned to accept commands from the system.
READY is turned off when:
1.
STOP or CARRIAGE STOP is pressed.
2.
The printer runs out of forms and control tape
channel-l punch is sensed.
3.
The typebar motor switch is turned to OFF.
4.
Control tape-brush assembly is opened.
5.
Six-to-eight line drive cover is opened.
6.
A form check switch on form tractor is
actuated.
The SYNC (Synchronization) Check Light
turns on
when the typebar is out of synchronism with the
printer. When this occurs, the printer is removed from
ready status. Pressing RESET turns the light off.
The Parity Check Light
turns on when a parity error
POWER
ON
READY
TYPEBARWOFF
REMOVAL.:
ON
•
TYPEBAR MOTOR SWITCH
DO NOT TURN OFF WHILE
TYPEBAR IS MOVING
SYNC
CHECK
PARITY
CHECK
Figure 13. 1443 Keys, Switches, and Lights
is de'tected by the error checking circuits. It is reset
by pressing console RESET, printer RESET, or when
the parity error indicator is program tested by a
branch-if-indicator on instruction.
The Form Check Light
turns on when a form-check
switch on a form tractor is actuated to indicate
improper feeding, or the form guide plates are not
in operating position.
The End-a/-Form Light
turns on when approximately
4 inches of the last form remains to be printed. The
printer continues to operate until ready status is reset
by sensing the next control tape channel-l punch.
Pressing START places the printer in ready status and
allows printing to continue un til another channel-l
punch is sensed. Ready status will again be reset.
The
Ca"iage Interlock Light
turns on if the typebar
motor is on and the tape-brush assembly is not
closed or the cover over the six-to-eight line drive is
open.
TYPEBAR
SELECTOR
SWITCH
FORM
CHECK
IBM 1443 Printer
39
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