IBM 1132 Theory Of Operation page 9

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Lights
Power On. This light indicates that power is being
supplied to the 1132 and that the 1132 motor switch
is on.
Ready. This light indicates that the 1132 printer is
ready to accept instructions from the system. Con-
ditions to place the machine in a ready status are:
1.
Forms are in printing position.
2.
Power is on.
3.
The start key is pressed after items 1 and 2 are
satisfied.
Print Scan Check. This light indicates that a print
·scan for a particular character has not been com-
pleted while that character is in position to print.
The light is automatically turned off when a sense
device instruction senses the condition.
Form Check. This light indicates that about 14
inches of paper or less remain in the machine.
When the form check light turns on, the ready light
is turned off.
Keys
Start. When this key is pressed, the printer is
placed in a ready status
if:
1.
Forms are in the machine.
2.
Power is on.
Stop. Pressing this key takes the printer out of the
ready status.
Carriage Restore. Pressing this key starts a car-
riage skip. This skip is automatically terminated
when a hole in control tape channel 1 is sensed. The
key is not effective when the machine is in a run
status. A manual control determines whether or not
the forms are moved.
Carriage Space. Pressing this key advances the
forms one space. The key is not effective when the
machine is in a run status.
Carriage Stop. Pressing this key stops a carriage
operation that is in progress.
1.4
Switches
Motor Switch. When on, this switch enables the cir-
cuit to cause the drive motor to run.
It
should be
turned off during ribbon replacement or when the
machine is not in use.
Carriage Manual Controls
Platen Clutch Knob. This knob disconnects the platen
from the drive motor so that the platen may be posi-
tioned independently of the carriage taP,e mechanism
(Figure 1-4).
Brush Holder
Latch
Lever
Figure 1-4. Right Side of-orrrlage
Platen Space Knob. Rotating this knob moves the
form vertically line by line. The platen clutch must
be disengaged so the form can move (Figure 1-4).
Platen Space Knob Vernier. Rotating the vernier
moves the form vertically less than one line space.
Turning the knob in a clockwise direction causes the
printing to occur higher on the form. Counterclock-
wise movement of the knob advances the platen and
lowers the printing on the form. In either case, the
carriage tape is not affected and adjustments can be
made while the platen is engaged and while the ma-
chine is in operation (Figure 1-4).
Forms Thickness Adjustment Device. This device
moves the entire carriage and platen away from its
normal position in relation to the printwheels. This

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