IBM 1627 Manual page 17

Pen Assembly
Carriage
/
Carriage
Drive Cable
Figure 2-4. 1627 Rear Oblique View
WARN1NG: Do not interchange 200 spm
motor PN 2162086 and 300 spm motor
PN 216955.
4. Place the replacement motor and gear
train assembly in position and hold the
motor so that the protruding pinion gear
is below the center axis of the motor.
WARN1NG: Use care when sliding the re-
placement motor into position to avoid
damaging the plastic gear that mates with
the pinion. Do not force the pinion into
mesh.
5. Install, but do not tighten, the two Allen cap
screws that mount the motor to the main
assembly.
6. Carefully rotate the motor case clockwise
until the pinion meshes and bottoms with the
2.6
Rear Chart
Spool
P5
plastic gear. Maintain clockwise pressure
while tightening the two cap screws. This
prevents backlash in the gear train.
7. Rotate the drum or the carriage drive pulley
by hand. Both must move freely, but with
perceptible resistance. There must be no
perceptible backlash when the drum or
carriage is rocked back and forth. If the
resistance is excessive, loosen the cap
screws and rotate the motor slightly coun-
terclockwise. If backlash is present, ro-
tate the motor slightly clockwise and again
tighten the cap screws.
8. Connect the lead wires from the new motor
to the three resistors and the standoff
insulator. Make certain the connections
are the same as those on the motor re-
moved in step 2:
brown
red
orange
top terminal
center terminal
bottom terminal